from __future__ import annotations
"""Medeia-Macina CLI.

This module intentionally uses a class-based architecture:
- no legacy procedural entrypoints
- no compatibility shims
- all REPL/pipeline/cmdlet execution state lives on objects
"""

import atexit
import io
import json
import re
import shlex
import sys
import threading
import time
import uuid
from copy import deepcopy
from datetime import datetime
from pathlib import Path
from typing import Any, Callable, Dict, List, Optional, Sequence, Set, TextIO, Tuple, cast

import typer
from prompt_toolkit import PromptSession
from prompt_toolkit.completion import Completer, Completion
from prompt_toolkit.document import Document
from prompt_toolkit.lexers import Lexer
from prompt_toolkit.styles import Style
from rich.console import Console
from rich.layout import Layout
from rich.panel import Panel
from rich.markdown import Markdown
from rich.bar import Bar
from rich.table import Table
from SYS.rich_display import (
    IMAGE_EXTENSIONS,
    render_image_to_console,
    render_item_details_panel,
    stderr_console,
    stdout_console,
)


def _install_rich_traceback(*, show_locals: bool = False) -> None:
    """Install Rich traceback handler as the default excepthook.

    This keeps uncaught exceptions readable in the terminal.
    """
    try:
        from rich.traceback import install as rich_traceback_install

        rich_traceback_install(show_locals=bool(show_locals))
    except Exception:
        # Fall back to the standard Python traceback if Rich isn't available.
        return


# Default to Rich tracebacks for the whole process.
_install_rich_traceback(show_locals=False)

from SYS.background_notifier import ensure_background_notifier
from SYS.logger import debug, set_debug
from SYS.worker_manager import WorkerManager

from SYS.cmdlet_catalog import (
    get_cmdlet_arg_choices,
    get_cmdlet_arg_flags,
    get_cmdlet_metadata,
    import_cmd_module,
    list_cmdlet_metadata,
    list_cmdlet_names,
)
from SYS.config import get_local_storage_path, load_config
from SYS.result_table import ResultTable
from ProviderCore.registry import provider_inline_query_choices

HELP_EXAMPLE_SOURCE_COMMANDS = {
    ".help-example",
    "help-example",
}


def _split_pipeline_tokens(tokens: Sequence[str]) -> List[List[str]]:
    """Split example tokens into per-stage command sequences using pipe separators."""

    stages: List[List[str]] = []
    current: List[str] = []
    for token in tokens:
        if token == "|":
            if current:
                stages.append(current)
                current = []
            continue
        current.append(str(token))
    if current:
        stages.append(current)
    return [stage for stage in stages if stage]

class SelectionSyntax:
    """Parses @ selection syntax into 1-based indices."""

    _RANGE_RE = re.compile(r"^[0-9\-]+$")

    @staticmethod
    def parse(token: str) -> Optional[Set[int]]:
        """Return 1-based indices or None when not a concrete selection.

        Concrete selections:
        - @2
        - @2-5
        - @{1,3,5}
        - @2,5,7-9

        Special (non-concrete) selectors return None:
        - @* (select all)
        - @.. (history prev)
        - @,, (history next)
        """

        if not token or not token.startswith("@"):
            return None

        selector = token[1:].strip()
        if selector in (".", ",", "*"):
            return None

        if selector.startswith("{") and selector.endswith("}"):
            selector = selector[1:-1].strip()

        indices: Set[int] = set()
        for part in selector.split(","):
            part = part.strip()
            if not part:
                continue

            if "-" in part:
                pieces = part.split("-", 1)
                if len(pieces) != 2:
                    return None
                start_str = pieces[0].strip()
                end_str = pieces[1].strip()
                if not start_str or not end_str:
                    return None
                try:
                    start = int(start_str)
                    end = int(end_str)
                except ValueError:
                    return None
                if start <= 0 or end <= 0 or start > end:
                    return None
                indices.update(range(start, end + 1))
                continue

            try:
                value = int(part)
            except ValueError:
                return None
            if value <= 0:
                return None
            indices.add(value)

        return indices if indices else None


class SelectionFilterSyntax:
    """Parses and applies @"COL:filter" selection filters.

    Notes:
    - CLI tokenization (shlex) strips quotes, so a user input of `@"TITLE:foo"`
      arrives as `@TITLE:foo`. We support both forms.
    - Filters apply to the *current selectable table items* (in-memory), not to
      provider searches.
    """

    _OP_RE = re.compile(r"^(>=|<=|!=|==|>|<|=)\s*(.+)$")
    _DUR_TOKEN_RE = re.compile(r"(?i)(\d+)\s*([hms])")

    @staticmethod
    def parse(token: str) -> Optional[List[Tuple[str, str]]]:
        """Return list of (column, raw_expression) or None when not a filter token."""

        if not token or not str(token).startswith("@"):
            return None

        if token.strip() == "@*":
            return None

        # If this is a concrete numeric selection (@2, @1-3, @{1,3}), do not treat it as a filter.
        try:
            if SelectionSyntax.parse(str(token)) is not None:
                return None
        except Exception:
            pass

        raw = str(token)[1:].strip()
        if not raw:
            return None

        # If quotes survived tokenization, strip a single symmetric wrapper.
        if len(raw) >= 2 and raw[0] == raw[-1] and raw[0] in ('"', "'"):
            raw = raw[1:-1].strip()

        # Shorthand: @"foo" means Title contains "foo".
        if ":" not in raw:
            if raw:
                return [("Title", raw)]
            return None

        parts = [p.strip() for p in raw.split(",") if p.strip()]
        conditions: List[Tuple[str, str]] = []
        for part in parts:
            if ":" not in part:
                return None
            col, expr = part.split(":", 1)
            col = str(col or "").strip()
            expr = str(expr or "").strip()
            if not col:
                return None
            conditions.append((col, expr))

        return conditions if conditions else None

    @staticmethod
    def _norm_key(text: str) -> str:
        return re.sub(r"\s+", " ", str(text or "").strip().lower())

    @staticmethod
    def _item_column_map(item: Any) -> Dict[str, str]:
        out: Dict[str, str] = {}

        def _set(k: Any, v: Any) -> None:
            key = SelectionFilterSyntax._norm_key(str(k or ""))
            if not key:
                return
            if v is None:
                return
            try:
                if isinstance(v, (list, tuple, set)):
                    text = ", ".join(str(x) for x in v if x is not None)
                else:
                    text = str(v)
            except Exception:
                return
            out[key] = text

        if isinstance(item, dict):
            # Display columns (primary UX surface)
            cols = item.get("columns")
            if isinstance(cols, list):
                for pair in cols:
                    try:
                        if isinstance(pair, (list, tuple)) and len(pair) == 2:
                            _set(pair[0], pair[1])
                    except Exception:
                        continue
            # Direct keys as fallback
            for k, v in item.items():
                if k == "columns":
                    continue
                _set(k, v)
        else:
            cols = getattr(item, "columns", None)
            if isinstance(cols, list):
                for pair in cols:
                    try:
                        if isinstance(pair, (list, tuple)) and len(pair) == 2:
                            _set(pair[0], pair[1])
                    except Exception:
                        continue
            for k in ("title", "path", "detail", "provider", "store", "table"):
                try:
                    _set(k, getattr(item, k, None))
                except Exception:
                    pass

        return out

    @staticmethod
    def _parse_duration_seconds(text: str) -> Optional[int]:
        s = str(text or "").strip()
        if not s:
            return None

        if s.isdigit():
            try:
                return max(0, int(s))
            except Exception:
                return None

        # clock format: M:SS or H:MM:SS
        if ":" in s:
            parts = [p.strip() for p in s.split(":")]
            if len(parts) == 2 and all(p.isdigit() for p in parts):
                m, sec = parts
                return max(0, int(m) * 60 + int(sec))
            if len(parts) == 3 and all(p.isdigit() for p in parts):
                h, m, sec = parts
                return max(0, int(h) * 3600 + int(m) * 60 + int(sec))

        # token format: 1h2m3s (tokens can appear in any combination)
        total = 0
        found = False
        for m in SelectionFilterSyntax._DUR_TOKEN_RE.finditer(s):
            found = True
            n = int(m.group(1))
            unit = m.group(2).lower()
            if unit == "h":
                total += n * 3600
            elif unit == "m":
                total += n * 60
            elif unit == "s":
                total += n
        if found:
            return max(0, int(total))

        return None

    @staticmethod
    def _parse_float(text: str) -> Optional[float]:
        s = str(text or "").strip()
        if not s:
            return None
        s = s.replace(",", "")
        try:
            return float(s)
        except Exception:
            return None

    @staticmethod
    def _parse_op(expr: str) -> tuple[Optional[str], str]:
        text = str(expr or "").strip()
        if not text:
            return None, ""
        m = SelectionFilterSyntax._OP_RE.match(text)
        if not m:
            return None, text
        return m.group(1), str(m.group(2) or "").strip()

    @staticmethod
    def matches(item: Any, conditions: List[Tuple[str, str]]) -> bool:
        colmap = SelectionFilterSyntax._item_column_map(item)

        for col, expr in conditions:
            key = SelectionFilterSyntax._norm_key(col)
            actual = colmap.get(key)

            # Convenience aliases for common UX names.
            if actual is None:
                if key == "duration":
                    actual = colmap.get("duration")
                elif key == "title":
                    actual = colmap.get("title")

            if actual is None:
                return False

            op, rhs = SelectionFilterSyntax._parse_op(expr)
            left_text = str(actual or "").strip()
            right_text = str(rhs or "").strip()

            if op is None:
                if not right_text:
                    return False
                if right_text.lower() not in left_text.lower():
                    return False
                continue

            # Comparator: try duration parsing first when it looks time-like.
            prefer_duration = (
                key == "duration"
                or any(ch in right_text for ch in (":", "h", "m", "s"))
                or any(ch in left_text for ch in (":", "h", "m", "s"))
            )

            left_num: Optional[float] = None
            right_num: Optional[float] = None

            if prefer_duration:
                ldur = SelectionFilterSyntax._parse_duration_seconds(left_text)
                rdur = SelectionFilterSyntax._parse_duration_seconds(right_text)
                if ldur is not None and rdur is not None:
                    left_num = float(ldur)
                    right_num = float(rdur)

            if left_num is None or right_num is None:
                left_num = SelectionFilterSyntax._parse_float(left_text)
                right_num = SelectionFilterSyntax._parse_float(right_text)

            if left_num is not None and right_num is not None:
                if op in ("=", "=="):
                    if not (left_num == right_num):
                        return False
                elif op == "!=":
                    if not (left_num != right_num):
                        return False
                elif op == ">":
                    if not (left_num > right_num):
                        return False
                elif op == ">=":
                    if not (left_num >= right_num):
                        return False
                elif op == "<":
                    if not (left_num < right_num):
                        return False
                elif op == "<=":
                    if not (left_num <= right_num):
                        return False
                else:
                    return False
                continue

            # Fallback to string equality for =/!= when numeric parsing fails.
            if op in ("=", "=="):
                if left_text.lower() != right_text.lower():
                    return False
            elif op == "!=":
                if left_text.lower() == right_text.lower():
                    return False
            else:
                return False

        return True


class WorkerOutputMirror(io.TextIOBase):
    """Mirror stdout/stderr to worker manager while preserving console output."""

    def __init__(
        self,
        original: TextIO,
        manager: WorkerManager,
        worker_id: str,
        channel: str
    ):
        self._original = original
        self._manager = manager
        self._worker_id = worker_id
        self._channel = channel
        self._pending: str = ""

    def write(self, data: str) -> int:  # type: ignore[override]
        if not data:
            return 0
        self._original.write(data)
        self._buffer_text(data)
        return len(data)

    def flush(self) -> None:  # type: ignore[override]
        self._original.flush()
        self._flush_pending(force=True)

    def isatty(self) -> bool:  # pragma: no cover
        return bool(getattr(self._original, "isatty", lambda: False)())

    def _buffer_text(self, data: str) -> None:
        combined = self._pending + data
        lines = combined.splitlines(keepends=True)
        if not lines:
            self._pending = combined
            return

        if lines[-1].endswith(("\n", "\r")):
            complete = lines
            self._pending = ""
        else:
            complete = lines[:-1]
            self._pending = lines[-1]

        for chunk in complete:
            self._emit(chunk)

    def _flush_pending(self, *, force: bool = False) -> None:
        if self._pending and force:
            self._emit(self._pending)
            self._pending = ""

    def _emit(self, text: str) -> None:
        if not text:
            return
        try:
            self._manager.append_stdout(self._worker_id, text, channel=self._channel)
        except Exception:
            pass

    @property
    def encoding(self) -> str:  # type: ignore[override]
        return getattr(self._original, "encoding", "utf-8")


class WorkerStageSession:
    """Lifecycle helper for wrapping a CLI cmdlet execution in a worker record."""

    def __init__(
        self,
        *,
        manager: WorkerManager,
        worker_id: str,
        orig_stdout: TextIO,
        orig_stderr: TextIO,
        stdout_proxy: WorkerOutputMirror,
        stderr_proxy: WorkerOutputMirror,
        config: Optional[Dict[str,
                              Any]],
        logging_enabled: bool,
        completion_label: str,
        error_label: str,
    ) -> None:
        self.manager = manager
        self.worker_id = worker_id
        self.orig_stdout = orig_stdout
        self.orig_stderr = orig_stderr
        self.stdout_proxy = stdout_proxy
        self.stderr_proxy = stderr_proxy
        self.config = config
        self.logging_enabled = logging_enabled
        self.closed = False
        self._completion_label = completion_label
        self._error_label = error_label

    def close(self, *, status: str = "completed", error_msg: str = "") -> None:
        if self.closed:
            return
        try:
            self.stdout_proxy.flush()
            self.stderr_proxy.flush()
        except Exception:
            pass

        sys.stdout = self.orig_stdout
        sys.stderr = self.orig_stderr

        if self.logging_enabled:
            try:
                self.manager.disable_logging_for_worker(self.worker_id)
            except Exception:
                pass

        try:
            if status == "completed":
                self.manager.log_step(self.worker_id, self._completion_label)
            else:
                self.manager.log_step(
                    self.worker_id,
                    f"{self._error_label}: {error_msg or status}"
                )
        except Exception:
            pass

        try:
            self.manager.finish_worker(
                self.worker_id,
                result=status or "completed",
                error_msg=error_msg or ""
            )
        except Exception:
            pass

        if self.config and self.config.get("_current_worker_id") == self.worker_id:
            self.config.pop("_current_worker_id", None)
        self.closed = True


class WorkerManagerRegistry:
    """Process-wide WorkerManager cache keyed by library_root."""

    _manager: Optional[WorkerManager] = None
    _manager_root: Optional[Path] = None
    _orphan_cleanup_done: bool = False
    _registered: bool = False

    @classmethod
    def ensure(cls, config: Dict[str, Any]) -> Optional[WorkerManager]:
        if not isinstance(config, dict):
            return None

        existing = config.get("_worker_manager")
        if isinstance(existing, WorkerManager):
            return existing

        library_root = get_local_storage_path(config)
        if not library_root:
            return None

        try:
            resolved_root = Path(library_root).resolve()
        except Exception:
            resolved_root = Path(library_root)

        try:
            if cls._manager is None or cls._manager_root != resolved_root:
                if cls._manager is not None:
                    try:
                        cls._manager.close()
                    except Exception:
                        pass
                cls._manager = WorkerManager(resolved_root, auto_refresh_interval=0.5)
                cls._manager_root = resolved_root

            manager = cls._manager
            config["_worker_manager"] = manager

            if manager is not None and not cls._orphan_cleanup_done:
                try:
                    manager.expire_running_workers(
                        older_than_seconds=120,
                        worker_id_prefix="cli_%",
                        reason=
                        "CLI session ended unexpectedly; marking worker as failed",
                    )
                except Exception:
                    pass
                else:
                    cls._orphan_cleanup_done = True

            if not cls._registered:
                atexit.register(cls.close)
                cls._registered = True

            return manager
        except Exception as exc:
            print(
                f"[worker] Could not initialize worker manager: {exc}",
                file=sys.stderr
            )
            return None

    @classmethod
    def close(cls) -> None:
        if cls._manager is None:
            return
        try:
            cls._manager.close()
        except Exception:
            pass
        cls._manager = None
        cls._manager_root = None
        cls._orphan_cleanup_done = False


class WorkerStages:
    """Factory methods for stage/pipeline worker sessions."""

    @staticmethod
    def _start_worker_session(
        worker_manager: Optional[WorkerManager],
        *,
        worker_type: str,
        title: str,
        description: str,
        pipe_text: str,
        config: Optional[Dict[str,
                              Any]],
        completion_label: str,
        error_label: str,
        skip_logging_for: Optional[Set[str]] = None,
        session_worker_ids: Optional[Set[str]] = None,
    ) -> Optional[WorkerStageSession]:
        if worker_manager is None:
            return None
        if skip_logging_for and worker_type in skip_logging_for:
            return None

        safe_type = worker_type or "cmd"
        worker_id = f"cli_{safe_type[:8]}_{uuid.uuid4().hex[:6]}"

        try:
            tracked = worker_manager.track_worker(
                worker_id,
                worker_type=worker_type,
                title=title,
                description=description or "(no args)",
                pipe=pipe_text,
            )
            if not tracked:
                return None
        except Exception as exc:
            print(f"[worker] Failed to track {worker_type}: {exc}", file=sys.stderr)
            return None

        if session_worker_ids is not None:
            session_worker_ids.add(worker_id)

        logging_enabled = False
        try:
            handler = worker_manager.enable_logging_for_worker(worker_id)
            logging_enabled = handler is not None
        except Exception:
            logging_enabled = False

        orig_stdout = sys.stdout
        orig_stderr = sys.stderr
        stdout_proxy = WorkerOutputMirror(
            orig_stdout,
            worker_manager,
            worker_id,
            "stdout"
        )
        stderr_proxy = WorkerOutputMirror(
            orig_stderr,
            worker_manager,
            worker_id,
            "stderr"
        )
        sys.stdout = stdout_proxy
        sys.stderr = stderr_proxy
        if isinstance(config, dict):
            config["_current_worker_id"] = worker_id

        try:
            worker_manager.log_step(worker_id, f"Started {worker_type}")
        except Exception:
            pass

        return WorkerStageSession(
            manager=worker_manager,
            worker_id=worker_id,
            orig_stdout=orig_stdout,
            orig_stderr=orig_stderr,
            stdout_proxy=stdout_proxy,
            stderr_proxy=stderr_proxy,
            config=config,
            logging_enabled=logging_enabled,
            completion_label=completion_label,
            error_label=error_label,
        )

    @classmethod
    def begin_stage(
        cls,
        worker_manager: Optional[WorkerManager],
        *,
        cmd_name: str,
        stage_tokens: Sequence[str],
        config: Optional[Dict[str,
                              Any]],
        command_text: str,
    ) -> Optional[WorkerStageSession]:
        description = " ".join(stage_tokens[1:]
                               ) if len(stage_tokens) > 1 else "(no args)"
        session_worker_ids = None
        if isinstance(config, dict):
            session_worker_ids = config.get("_session_worker_ids")

        return cls._start_worker_session(
            worker_manager,
            worker_type=cmd_name,
            title=f"{cmd_name} stage",
            description=description,
            pipe_text=command_text,
            config=config,
            completion_label="Stage completed",
            error_label="Stage error",
            skip_logging_for={".worker",
                              "worker",
                              "workers"},
            session_worker_ids=session_worker_ids,
        )

    @classmethod
    def begin_pipeline(
        cls,
        worker_manager: Optional[WorkerManager],
        *,
        pipeline_text: str,
        config: Optional[Dict[str,
                              Any]],
    ) -> Optional[WorkerStageSession]:
        session_worker_ids: Set[str] = set()
        if isinstance(config, dict):
            config["_session_worker_ids"] = session_worker_ids

        return cls._start_worker_session(
            worker_manager,
            worker_type="pipeline",
            title="Pipeline run",
            description=pipeline_text,
            pipe_text=pipeline_text,
            config=config,
            completion_label="Pipeline completed",
            error_label="Pipeline error",
            session_worker_ids=session_worker_ids,
        )


class CmdletIntrospection:

    @staticmethod
    def cmdlet_names(force: bool = False) -> List[str]:
        try:
            return list_cmdlet_names(force=force) or []
        except Exception:
            return []

    @staticmethod
    def cmdlet_args(cmd_name: str,
                    config: Optional[Dict[str,
                                          Any]] = None) -> List[str]:
        try:
            return get_cmdlet_arg_flags(cmd_name, config=config) or []
        except Exception:
            return []

    @staticmethod
    def store_choices(config: Dict[str, Any], force: bool = False) -> List[str]:
        try:
            # Use the cached startup check from SharedArgs
            from cmdlet._shared import SharedArgs
            return SharedArgs.get_store_choices(config, force=force)
        except Exception:
            return []

    @classmethod
    def arg_choices(cls,
                    *,
                    cmd_name: str,
                    arg_name: str,
                    config: Dict[str,
                                 Any],
                    force: bool = False) -> List[str]:
        try:
            normalized_arg = (arg_name or "").lstrip("-").strip().lower()

            if normalized_arg in ("storage", "store"):
                backends = cls.store_choices(config, force=force)
                if backends:
                    return backends

            if normalized_arg == "provider":
                canonical_cmd = (cmd_name or "").replace("_", "-").lower()
                try:
                    from ProviderCore.registry import list_search_providers, list_file_providers
                except Exception:
                    list_search_providers = None  # type: ignore
                    list_file_providers = None  # type: ignore

                provider_choices: List[str] = []

                if canonical_cmd in {"add-file"} and list_file_providers is not None:
                    providers = list_file_providers(config) or {}
                    available = [
                        name for name, is_ready in providers.items() if is_ready
                    ]
                    return sorted(available) if available else sorted(providers.keys())

                if list_search_providers is not None:
                    providers = list_search_providers(config) or {}
                    available = [
                        name for name, is_ready in providers.items() if is_ready
                    ]
                    provider_choices = sorted(available) if available else sorted(
                        providers.keys()
                    )

                if provider_choices:
                    return provider_choices

            if normalized_arg == "scrape":
                try:
                    from Provider.metadata_provider import list_metadata_providers

                    meta_providers = list_metadata_providers(config) or {}
                    if meta_providers:
                        return sorted(meta_providers.keys())
                except Exception:
                    pass

            return get_cmdlet_arg_choices(cmd_name, arg_name) or []
        except Exception:
            return []


class CmdletCompleter(Completer):
    """Prompt-toolkit completer for the Medeia cmdlet REPL."""

    def __init__(self, *, config_loader: "ConfigLoader") -> None:
        self._config_loader = config_loader
        self.cmdlet_names = CmdletIntrospection.cmdlet_names()

    @staticmethod
    def _used_arg_logicals(
        cmd_name: str,
        stage_tokens: List[str],
        config: Dict[str,
                     Any]
    ) -> Set[str]:
        """Return logical argument names already used in this cmdlet stage.

        Example: if the user has typed `download-file -url ...`, then `url`
        is considered used and should not be suggested again (even as `--url`).
        """
        arg_flags = CmdletIntrospection.cmdlet_args(cmd_name, config)
        allowed = {a.lstrip("-").strip().lower()
                   for a in arg_flags if a}
        if not allowed:
            return set()

        used: Set[str] = set()
        for tok in stage_tokens[1:]:
            if not tok or not tok.startswith("-"):
                continue
            if tok in {"-",
                       "--"}:
                continue
            # Handle common `-arg=value` form.
            raw = tok.split("=", 1)[0]
            logical = raw.lstrip("-").strip().lower()
            if logical and logical in allowed:
                used.add(logical)

        return used

    @staticmethod
    def _flag_value(tokens: Sequence[str], *flags: str) -> Optional[str]:
        want = {str(f).strip().lower() for f in flags if str(f).strip()}
        if not want:
            return None
        for idx, tok in enumerate(tokens):
            low = str(tok or "").strip().lower()
            if "=" in low:
                head, val = low.split("=", 1)
                if head in want:
                    return tok.split("=", 1)[1]
            if low in want and idx + 1 < len(tokens):
                return tokens[idx + 1]
        return None

    def get_completions(
        self,
        document: Document,
        complete_event
    ):  # type: ignore[override]
        # Refresh cmdlet names from introspection to pick up dynamic updates
        self.cmdlet_names = CmdletIntrospection.cmdlet_names(force=True)

        text = document.text_before_cursor
        tokens = text.split()
        ends_with_space = bool(text) and text[-1].isspace()

        last_pipe = -1
        for idx, tok in enumerate(tokens):
            if tok == "|":
                last_pipe = idx
        stage_tokens = tokens[last_pipe + 1:] if last_pipe >= 0 else tokens

        if not stage_tokens:
            for cmd in self.cmdlet_names:
                yield Completion(cmd, start_position=0)
            return

        if len(stage_tokens) == 1:
            current = stage_tokens[0].lower()

            if ends_with_space:
                cmd_name = current.replace("_", "-")

                config = self._config_loader.load()

                if cmd_name == "help":
                    for cmd in self.cmdlet_names:
                        yield Completion(cmd, start_position=0)
                    return

                if cmd_name not in self.cmdlet_names:
                    return

                arg_names = CmdletIntrospection.cmdlet_args(cmd_name, config)
                logical_seen: Set[str] = set()
                for arg in arg_names:
                    arg_low = arg.lower()
                    if arg_low.startswith("--"):
                        continue
                    logical = arg.lstrip("-").lower()
                    if logical in logical_seen:
                        continue
                    yield Completion(arg, start_position=0)
                    logical_seen.add(logical)

                yield Completion("-help", start_position=0)
                return

            for cmd in self.cmdlet_names:
                if cmd.startswith(current):
                    yield Completion(cmd, start_position=-len(current))
            for keyword in ("help", "exit", "quit"):
                if keyword.startswith(current):
                    yield Completion(keyword, start_position=-len(current))
            return

        cmd_name = stage_tokens[0].replace("_", "-").lower()
        if ends_with_space:
            current_token = ""
            prev_token = stage_tokens[-1].lower()
        else:
            current_token = stage_tokens[-1].lower()
            prev_token = stage_tokens[-2].lower() if len(stage_tokens) > 1 else ""

        config = self._config_loader.load()

        provider_name = None
        if cmd_name == "search-file":
            provider_name = self._flag_value(stage_tokens, "-provider", "--provider")

        if (
            cmd_name == "search-file"
            and provider_name
            and not ends_with_space
            and ":" in current_token
            and not current_token.startswith("-")
        ):
            # Allow quoted tokens like "system:g
            quote_prefix = current_token[0] if current_token[:1] in {"'", '"'} else ""
            inline_token = current_token[1:] if quote_prefix else current_token
            if inline_token.endswith(quote_prefix) and len(inline_token) > 1:
                inline_token = inline_token[:-1]

            # Allow comma-separated inline specs; operate on the last segment only.
            if "," in inline_token:
                inline_token = inline_token.split(",")[-1].lstrip()

            if ":" not in inline_token:
                return

            field, partial = inline_token.split(":", 1)
            field = field.strip().lower()
            partial_lower = partial.strip().lower()
            inline_choices = provider_inline_query_choices(provider_name, field, config)
            if inline_choices:
                filtered = (
                    [c for c in inline_choices if partial_lower in str(c).lower()]
                    if partial_lower
                    else list(inline_choices)
                )
                for choice in (filtered or inline_choices):
                    # Replace only the partial after the colon; keep the field prefix and quotes as typed.
                    start_pos = -len(partial)
                    suggestion = str(choice)
                    yield Completion(suggestion, start_position=start_pos)
                return

        choices = CmdletIntrospection.arg_choices(
            cmd_name=cmd_name,
            arg_name=prev_token,
            config=config,
            force=True
        )
        if choices:
            choice_list = choices
            normalized_prev = prev_token.lstrip("-").strip().lower()
            if normalized_prev == "provider" and current_token:
                current_lower = current_token.lower()
                filtered = [c for c in choices if current_lower in c.lower()]
                if filtered:
                    choice_list = filtered

            for choice in choice_list:
                yield Completion(choice, start_position=-len(current_token))
            # Example: if the user has typed `download-file -url ...`, then `url`
            # is considered used and should not be suggested again (even as `--url`).
            return

        arg_names = CmdletIntrospection.cmdlet_args(cmd_name, config)
        used_logicals = self._used_arg_logicals(cmd_name, stage_tokens, config)
        logical_seen: Set[str] = set()
        for arg in arg_names:
            arg_low = arg.lower()
            prefer_single_dash = current_token in {"",
                                                   "-"}
            if prefer_single_dash and arg_low.startswith("--"):
                continue
            logical = arg.lstrip("-").lower()
            if logical in used_logicals:
                continue
            if prefer_single_dash and logical in logical_seen:
                continue
            if arg_low.startswith(current_token):
                yield Completion(arg, start_position=-len(current_token))
                if prefer_single_dash:
                    logical_seen.add(logical)

        if cmd_name in self.cmdlet_names:
            if current_token.startswith("--"):
                if "--help".startswith(current_token):
                    yield Completion("--help", start_position=-len(current_token))
            else:
                if "-help".startswith(current_token):
                    yield Completion("-help", start_position=-len(current_token))


class MedeiaLexer(Lexer):

    def lex_document(self, document: Document):  # type: ignore[override]

        def get_line(lineno: int):
            line = document.lines[lineno]
            tokens: List[tuple[str, str]] = []

            pattern = re.compile(
                r"""
                (\s+) |                                      # 1. Whitespace
                (\|) |                                       # 2. Pipe
                ("(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*') |      # 3. Quoted string
                ([^\s\|]+)                                   # 4. Word
                """,
                re.VERBOSE,
            )

            is_cmdlet = True

            def _emit_keyed_value(word: str) -> bool:
                """Emit `key:` prefixes (comma-separated) as argument tokens.

                Designed for values like:
                  clip:3m4s-3m14s,1h22m-1h33m,item:2-3

                Avoids special-casing URLs (://) and Windows drive paths (C:\\...).
                Returns True if it handled the token.
                """
                if not word or ":" not in word:
                    return False
                # Avoid URLs and common scheme patterns.
                if "://" in word:
                    return False
                # Avoid Windows drive paths (e.g., C:\foo or D:/bar)
                if re.match(r"^[A-Za-z]:[\\/]", word):
                    return False

                key_prefix = re.compile(r"^([A-Za-z_][A-Za-z0-9_-]*:)(.*)$")
                parts = word.split(",")
                handled_any = False
                for i, part in enumerate(parts):
                    if i > 0:
                        tokens.append(("class:value", ","))
                    if part == "":
                        continue
                    m = key_prefix.match(part)
                    if m:
                        tokens.append(("class:argument", m.group(1)))
                        if m.group(2):
                            tokens.append(("class:value", m.group(2)))
                        handled_any = True
                    else:
                        tokens.append(("class:value", part))
                        handled_any = True

                return handled_any

            for match in pattern.finditer(line):
                ws, pipe, quote, word = match.groups()
                if ws:
                    tokens.append(("", ws))
                    continue
                if pipe:
                    tokens.append(("class:pipe", pipe))
                    is_cmdlet = True
                    continue
                if quote:
                    # If the quoted token contains a keyed spec (clip:/item:/hash:),
                    # highlight the `key:` portion in argument-blue even inside quotes.
                    if len(quote) >= 2 and quote[0] == quote[-1] and quote[0] in ('"',
                                                                                  "'"):
                        q = quote[0]
                        inner = quote[1:-1]
                        start_index = len(tokens)
                        if _emit_keyed_value(inner):
                            # _emit_keyed_value already appended tokens for inner; insert opening quote
                            # before that chunk, then add the closing quote.
                            tokens.insert(start_index, ("class:string", q))
                            tokens.append(("class:string", q))
                            is_cmdlet = False
                            continue

                    tokens.append(("class:string", quote))
                    is_cmdlet = False
                    continue
                if not word:
                    continue

                if word.startswith("@"):  # selection tokens
                    rest = word[1:]
                    if rest and re.fullmatch(r"[0-9\-\*,]+", rest):
                        tokens.append(("class:selection_at", "@"))
                        tokens.append(("class:selection_range", rest))
                        is_cmdlet = False
                        continue
                    if rest == "":
                        tokens.append(("class:selection_at", "@"))
                        is_cmdlet = False
                        continue

                if is_cmdlet:
                    tokens.append(("class:cmdlet", word))
                    is_cmdlet = False
                elif word.startswith("-"):
                    tokens.append(("class:argument", word))
                else:
                    if not _emit_keyed_value(word):
                        tokens.append(("class:value", word))

            return tokens

        return get_line


class ConfigLoader:

    def __init__(self, *, root: Path) -> None:
        self._root = root

    def load(self) -> Dict[str, Any]:
        try:
            return deepcopy(load_config(config_dir=self._root))
        except Exception:
            return {}


class CmdletHelp:

    @staticmethod
    def show_cmdlet_list() -> None:
        try:
            metadata = list_cmdlet_metadata() or {}
            from rich.box import SIMPLE
            from rich.panel import Panel
            from rich.table import Table as RichTable

            table = RichTable(
                show_header=True,
                header_style="bold",
                box=SIMPLE,
                expand=True
            )
            table.add_column("Cmdlet", no_wrap=True)
            table.add_column("Aliases")
            table.add_column("Args")
            table.add_column("Summary")

            for cmd_name in sorted(metadata.keys()):
                info = metadata[cmd_name]
                aliases = info.get("aliases", [])
                args = info.get("args", [])
                summary = info.get("summary") or ""
                alias_str = ", ".join(
                    [str(a) for a in (aliases or []) if str(a).strip()]
                )
                arg_names = [
                    a.get("name") for a in (args or [])
                    if isinstance(a, dict) and a.get("name")
                ]
                args_str = ", ".join([str(a) for a in arg_names if str(a).strip()])
                table.add_row(str(cmd_name), alias_str, args_str, str(summary))

            stdout_console().print(Panel(table, title="Cmdlets", expand=False))
        except Exception as exc:
            from rich.panel import Panel
            from rich.text import Text

            stderr_console().print(
                Panel(Text(f"Error: {exc}"),
                      title="Error",
                      expand=False)
            )

    @staticmethod
    def show_cmdlet_help(cmd_name: str) -> None:
        try:
            meta = get_cmdlet_metadata(cmd_name)
            if meta:
                CmdletHelp._print_metadata(cmd_name, meta)
                return
            print(f"Unknown command: {cmd_name}\n")
        except Exception as exc:
            print(f"Error: {exc}\n")

    @staticmethod
    def _print_metadata(cmd_name: str, data: Any) -> None:
        d = data.to_dict() if hasattr(data, "to_dict") else data
        if not isinstance(d, dict):
            from rich.panel import Panel
            from rich.text import Text

            stderr_console().print(
                Panel(
                    Text(f"Invalid metadata for {cmd_name}"),
                    title="Error",
                    expand=False
                )
            )
            return

        name = d.get("name", cmd_name)
        summary = d.get("summary", "")
        usage = d.get("usage", "")
        description = d.get("description", "")
        args = d.get("args", [])
        details = d.get("details", [])

        from rich.box import SIMPLE
        from rich.console import Group
        from rich.panel import Panel
        from rich.table import Table as RichTable
        from rich.text import Text

        header = Text.assemble((str(name), "bold"))
        synopsis = Text(str(usage or name))
        stdout_console().print(
            Panel(Group(header,
                        synopsis),
                  title="Help",
                  expand=False)
        )

        if summary or description:
            desc_bits: List[Text] = []
            if summary:
                desc_bits.append(Text(str(summary)))
            if description:
                desc_bits.append(Text(str(description)))
            stdout_console().print(
                Panel(Group(*desc_bits),
                      title="Description",
                      expand=False)
            )

        if args and isinstance(args, list):
            param_table = RichTable(
                show_header=True,
                header_style="bold",
                box=SIMPLE,
                expand=True
            )
            param_table.add_column("Arg", no_wrap=True)
            param_table.add_column("Type", no_wrap=True)
            param_table.add_column("Required", no_wrap=True)
            param_table.add_column("Description")
            for arg in args:
                if isinstance(arg, dict):
                    name_str = arg.get("name", "?")
                    typ = arg.get("type", "string")
                    required = bool(arg.get("required", False))
                    desc = arg.get("description", "")
                else:
                    name_str = getattr(arg, "name", "?")
                    typ = getattr(arg, "type", "string")
                    required = bool(getattr(arg, "required", False))
                    desc = getattr(arg, "description", "")

                param_table.add_row(
                    f"-{name_str}",
                    str(typ),
                    "yes" if required else "no",
                    str(desc or "")
                )

            stdout_console().print(Panel(param_table, title="Parameters", expand=False))

        if details:
            stdout_console().print(
                Panel(
                    Group(*[Text(str(x)) for x in details]),
                    title="Remarks",
                    expand=False
                )
            )


class CmdletExecutor:

    def __init__(self, *, config_loader: ConfigLoader) -> None:
        self._config_loader = config_loader

    @staticmethod
    def _get_table_title_for_command(
        cmd_name: str,
        emitted_items: Optional[List[Any]] = None,
        cmd_args: Optional[List[str]] = None,
    ) -> str:
        title_map = {
            "search-file": "Results",
            "search_file": "Results",
            "download-data": "Downloads",
            "download_data": "Downloads",
            "download-file": "Downloads",
            "download_file": "Downloads",
            "get-tag": "Tags",
            "get_tag": "Tags",
            "get-file": "Results",
            "get_file": "Results",
            "add-tags": "Results",
            "add_tags": "Results",
            "delete-tag": "Results",
            "delete_tag": "Results",
            "add-url": "Results",
            "add_url": "Results",
            "get-url": "url",
            "get_url": "url",
            "delete-url": "Results",
            "delete_url": "Results",
            "get-note": "Notes",
            "get_note": "Notes",
            "add-note": "Results",
            "add_note": "Results",
            "delete-note": "Results",
            "delete_note": "Results",
            "get-relationship": "Relationships",
            "get_relationship": "Relationships",
            "add-relationship": "Results",
            "add_relationship": "Results",
            "add-file": "Results",
            "add_file": "Results",
            "delete-file": "Results",
            "delete_file": "Results",
            "get-metadata": None,
            "get_metadata": None,
        }
        mapped = title_map.get(cmd_name, "Results")
        if mapped is not None:
            return mapped

        if emitted_items:
            first = emitted_items[0]
            try:
                if isinstance(first, dict) and first.get("title"):
                    return str(first.get("title"))
                if hasattr(first, "title") and getattr(first, "title"):
                    return str(getattr(first, "title"))
            except Exception:
                pass
        return "Results"

    def execute(self, cmd_name: str, args: List[str]) -> None:
        from SYS import pipeline as ctx
        from cmdlet import REGISTRY

        # REPL guard: stage-local selection tables should not leak across independent
        # commands. @ selection can always re-seed from the last result table.
        try:
            if hasattr(ctx, "set_current_stage_table"):
                ctx.set_current_stage_table(None)
        except Exception:
            pass

        cmd_fn = REGISTRY.get(cmd_name)
        if not cmd_fn:
            # Lazy-import module and register its CMDLET.
            try:
                mod = import_cmd_module(cmd_name)
                data = getattr(mod, "CMDLET", None) if mod else None
                if data and hasattr(data, "exec") and callable(getattr(data, "exec")):
                    run_fn = getattr(data, "exec")
                    REGISTRY[cmd_name] = run_fn
                    cmd_fn = run_fn
            except Exception:
                cmd_fn = None

        if not cmd_fn:
            print(f"Unknown command: {cmd_name}\n")
            return

        config = self._config_loader.load()

        # ------------------------------------------------------------------
        # Single-command Live pipeline progress (match REPL behavior)
        # ------------------------------------------------------------------
        progress_ui = None
        pipe_idx: Optional[int] = None

        def _maybe_start_single_live_progress(
            *,
            cmd_name_norm: str,
            filtered_args: List[str],
            piped_input: Any,
            config: Any,
        ) -> None:
            nonlocal progress_ui, pipe_idx

            # Keep behavior consistent with pipeline runner exclusions.
            # Some commands render their own Rich UI (tables/panels) and don't
            # play nicely with Live cursor control.
            if cmd_name_norm in {
                    "get-relationship",
                    "get-rel",
                    ".pipe",
                    ".mpv",
                    ".matrix",
                    ".telegram",
                    "telegram",
                    "delete-file",
                    "del-file",
            }:
                return

            # add-file directory selector mode: show only the selection table, no Live progress.
            if cmd_name_norm in {"add-file",
                                 "add_file"}:
                try:
                    from pathlib import Path as _Path

                    toks = list(filtered_args or [])
                    i = 0
                    while i < len(toks):
                        t = str(toks[i])
                        low = t.lower().strip()
                        if low in {"-path",
                                   "--path",
                                   "-p"} and i + 1 < len(toks):
                            nxt = str(toks[i + 1])
                            if nxt and ("," not in nxt):
                                p = _Path(nxt)
                                if p.exists() and p.is_dir():
                                    return
                            i += 2
                            continue
                        i += 1
                except Exception:
                    pass

            try:
                quiet_mode = (
                    bool(config.get("_quiet_background_output"))
                    if isinstance(config,
                                  dict) else False
                )
            except Exception:
                quiet_mode = False
            if quiet_mode:
                return

            try:
                import sys as _sys

                if not bool(getattr(_sys.stderr, "isatty", lambda: False)()):
                    return
            except Exception:
                return

            try:
                from SYS.models import PipelineLiveProgress

                progress_ui = PipelineLiveProgress([cmd_name_norm], enabled=True)
                progress_ui.start()
                try:
                    if hasattr(ctx, "set_live_progress"):
                        ctx.set_live_progress(progress_ui)
                except Exception:
                    pass

                pipe_idx = 0

                # Estimate per-item task count for the single pipe.
                total_items = 1
                preview_items: Optional[List[Any]] = None
                try:
                    if isinstance(piped_input, list):
                        total_items = max(1, int(len(piped_input)))
                        preview_items = list(piped_input)
                    elif piped_input is not None:
                        total_items = 1
                        preview_items = [piped_input]
                    else:
                        preview: List[Any] = []
                        toks = list(filtered_args or [])
                        i = 0
                        while i < len(toks):
                            t = str(toks[i])
                            low = t.lower().strip()
                            if (cmd_name_norm in {"add-file",
                                                  "add_file"} and low in {"-path",
                                                                          "--path",
                                                                          "-p"}
                                    and i + 1 < len(toks)):
                                nxt = str(toks[i + 1])
                                if nxt:
                                    if "," in nxt:
                                        parts = [
                                            p.strip().strip("\"'")
                                            for p in nxt.split(",")
                                        ]
                                        parts = [p for p in parts if p]
                                        if parts:
                                            preview.extend(parts)
                                            i += 2
                                            continue
                                    else:
                                        preview.append(nxt)
                                        i += 2
                                        continue
                            if low in {"-url",
                                       "--url"} and i + 1 < len(toks):
                                nxt = str(toks[i + 1])
                                if nxt and not nxt.startswith("-"):
                                    preview.append(nxt)
                                i += 2
                                continue
                            if (not t.startswith("-")) and ("://" in low
                                                            or low.startswith(
                                                                ("magnet:",
                                                                 "torrent:"))):
                                preview.append(t)
                            i += 1
                        preview_items = preview if preview else None
                        total_items = max(1, int(len(preview)) if preview else 1)
                except Exception:
                    total_items = 1
                    preview_items = None

                try:
                    progress_ui.begin_pipe(
                        0,
                        total_items=int(total_items),
                        items_preview=preview_items
                    )
                except Exception:
                    pass
            except Exception:
                progress_ui = None
                pipe_idx = None

        filtered_args: List[str] = []
        selected_indices: List[int] = []
        select_all = False
        selection_filters: List[List[Tuple[str, str]]] = []

        value_flags: Set[str] = set()
        try:
            meta = get_cmdlet_metadata(cmd_name)
            raw = meta.get("raw") if isinstance(meta, dict) else None
            arg_specs = getattr(raw, "arg", None) if raw is not None else None
            if isinstance(arg_specs, list):
                for spec in arg_specs:
                    spec_type = str(getattr(spec,
                                            "type",
                                            "string") or "string").strip().lower()
                    if spec_type == "flag":
                        continue
                    spec_name = str(getattr(spec, "name", "") or "")
                    canonical = spec_name.lstrip("-").strip()
                    if not canonical:
                        continue
                    value_flags.add(f"-{canonical}".lower())
                    value_flags.add(f"--{canonical}".lower())
                    alias = str(getattr(spec, "alias", "") or "").strip()
                    if alias:
                        value_flags.add(f"-{alias}".lower())
        except Exception:
            value_flags = set()

        for i, arg in enumerate(args):
            if isinstance(arg, str) and arg.startswith("@"):  # selection candidate
                prev = str(args[i - 1]).lower() if i > 0 else ""
                if prev in value_flags:
                    filtered_args.append(arg)
                    continue

                # Universal selection filter: @"COL:expr" (quotes may be stripped by tokenization)
                filter_spec = SelectionFilterSyntax.parse(arg)
                if filter_spec is not None:
                    selection_filters.append(filter_spec)
                    continue

                if arg.strip() == "@*":
                    select_all = True
                    continue

                selection = SelectionSyntax.parse(arg)
                if selection is not None:
                    zero_based = sorted(idx - 1 for idx in selection)
                    for idx in zero_based:
                        if idx not in selected_indices:
                            selected_indices.append(idx)
                    continue

                filtered_args.append(arg)
                continue

            filtered_args.append(str(arg))

        # IMPORTANT: Do not implicitly feed the previous command's results into
        # a new command unless the user explicitly selected items via @ syntax.
        # Piping should require `|` (or an explicit @ selection).
        piped_items = ctx.get_last_result_items()
        result: Any = None
        effective_selected_indices: List[int] = []
        if piped_items and (select_all or selected_indices or selection_filters):
            candidate_idxs = list(range(len(piped_items)))
            for spec in selection_filters:
                candidate_idxs = [
                    i for i in candidate_idxs
                    if SelectionFilterSyntax.matches(piped_items[i], spec)
                ]

            if select_all:
                effective_selected_indices = list(candidate_idxs)
            elif selected_indices:
                effective_selected_indices = [
                    candidate_idxs[i] for i in selected_indices
                    if 0 <= i < len(candidate_idxs)
                ]
            else:
                effective_selected_indices = list(candidate_idxs)

            result = [piped_items[i] for i in effective_selected_indices]

        worker_manager = WorkerManagerRegistry.ensure(config)
        stage_session = WorkerStages.begin_stage(
            worker_manager,
            cmd_name=cmd_name,
            stage_tokens=[cmd_name,
                          *filtered_args],
            config=config,
            command_text=" ".join([cmd_name,
                                   *filtered_args]).strip() or cmd_name,
        )

        stage_worker_id = stage_session.worker_id if stage_session else None

        # Start live progress after we know the effective cmd + args + piped input.
        cmd_norm = str(cmd_name or "").replace("_", "-").strip().lower()
        _maybe_start_single_live_progress(
            cmd_name_norm=cmd_norm or str(cmd_name or "").strip().lower(),
            filtered_args=filtered_args,
            piped_input=result,
            config=config,
        )

        on_emit = None
        if progress_ui is not None and pipe_idx is not None:
            _ui = progress_ui

            def _on_emit(obj: Any, _progress=_ui) -> None:
                try:
                    _progress.on_emit(0, obj)
                except Exception:
                    pass

            on_emit = _on_emit

        pipeline_ctx = ctx.PipelineStageContext(
            stage_index=0,
            total_stages=1,
            pipe_index=pipe_idx if pipe_idx is not None else 0,
            worker_id=stage_worker_id,
            on_emit=on_emit,
        )
        ctx.set_stage_context(pipeline_ctx)
        stage_status = "completed"
        stage_error = ""

        ctx.set_last_selection(effective_selected_indices)
        try:
            try:
                if hasattr(ctx, "set_current_cmdlet_name"):
                    ctx.set_current_cmdlet_name(cmd_name)
            except Exception:
                pass

            try:
                if hasattr(ctx, "set_current_stage_text"):
                    raw_stage = ""
                    try:
                        raw_stage = (
                            ctx.get_current_command_text("")
                            if hasattr(ctx,
                                       "get_current_command_text") else ""
                        )
                    except Exception:
                        raw_stage = ""
                    if raw_stage:
                        ctx.set_current_stage_text(raw_stage)
                    else:
                        ctx.set_current_stage_text(
                            " ".join([cmd_name,
                                      *filtered_args]).strip() or cmd_name
                        )
            except Exception:
                pass

            ret_code = cmd_fn(result, filtered_args, config)

            if getattr(pipeline_ctx, "emits", None):
                emits = list(pipeline_ctx.emits)

                # Shared `-path` behavior: if the cmdlet emitted temp/PATH file artifacts,
                # move them to the user-specified destination and update emitted paths.
                try:
                    from cmdlet import _shared as sh

                    emits = sh.apply_output_path_from_pipeobjects(
                        cmd_name=cmd_name,
                        args=filtered_args,
                        emits=emits
                    )
                    try:
                        pipeline_ctx.emits = list(emits)
                    except Exception:
                        pass
                except Exception:
                    pass

                # Detect format-selection emits and skip printing (user selects with @N).
                is_format_selection = False
                if emits:
                    first_emit = emits[0]
                    if isinstance(first_emit, dict) and "format_id" in first_emit:
                        is_format_selection = True

                if is_format_selection:
                    ctx.set_last_result_items_only(emits)
                else:
                    table_title = self._get_table_title_for_command(
                        cmd_name,
                        emits,
                        filtered_args
                    )

                    selectable_commands = {
                        "search-file",
                        "download-data",
                        "download-file",
                        "search_file",
                        "download_data",
                        "download_file",
                        ".config",
                        ".worker",
                    }
                    display_only_commands = {
                        "get-url",
                        "get_url",
                        "get-note",
                        "get_note",
                        "get-relationship",
                        "get_relationship",
                        "get-file",
                        "get_file",
                    }
                    self_managing_commands = {
                        "get-tag",
                        "get_tag",
                        "tags",
                        "search-file",
                        "search_file",
                    }

                    if cmd_name in self_managing_commands:
                        table = ctx.get_last_result_table()
                        if table is None:
                            table = ResultTable(table_title)
                            for emitted in emits:
                                table.add_result(emitted)
                    else:
                        table = ResultTable(table_title)
                        for emitted in emits:
                            table.add_result(emitted)

                        if cmd_name in selectable_commands:
                            table.set_source_command(cmd_name, filtered_args)
                            ctx.set_last_result_table(table, emits)
                            ctx.set_current_stage_table(None)
                        elif cmd_name in display_only_commands:
                            ctx.set_last_result_items_only(emits)
                        else:
                            ctx.set_last_result_items_only(emits)

                    # Stop Live progress before printing tables.
                    if progress_ui is not None:
                        try:
                            if pipe_idx is not None:
                                progress_ui.finish_pipe(
                                    int(pipe_idx),
                                    force_complete=(stage_status == "completed")
                                )
                        except Exception:
                            pass
                        try:
                            progress_ui.stop()
                        except Exception:
                            pass
                        try:
                            if hasattr(ctx, "set_live_progress"):
                                ctx.set_live_progress(None)
                        except Exception:
                            pass
                        progress_ui = None
                        pipe_idx = None

                    stdout_console().print()
                    stdout_console().print(table)

            # If the cmdlet produced a current-stage table without emits (e.g. format selection),
            # render it here for parity with REPL pipeline runner.
            if (not getattr(pipeline_ctx,
                            "emits",
                            None)) and hasattr(ctx,
                                               "get_current_stage_table"):
                try:
                    stage_table = ctx.get_current_stage_table()
                except Exception:
                    stage_table = None
                if stage_table is not None:
                    try:
                        already_rendered = bool(
                            getattr(stage_table,
                                    "_rendered_by_cmdlet",
                                    False)
                        )
                    except Exception:
                        already_rendered = False

                    if already_rendered:
                        return

                    if progress_ui is not None:
                        try:
                            if pipe_idx is not None:
                                progress_ui.finish_pipe(
                                    int(pipe_idx),
                                    force_complete=(stage_status == "completed")
                                )
                        except Exception:
                            pass
                        try:
                            progress_ui.stop()
                        except Exception:
                            pass
                        try:
                            if hasattr(ctx, "set_live_progress"):
                                ctx.set_live_progress(None)
                        except Exception:
                            pass
                        progress_ui = None
                        pipe_idx = None
                    stdout_console().print()
                    stdout_console().print(stage_table)

            if ret_code != 0:
                stage_status = "failed"
                stage_error = f"exit code {ret_code}"
                # No print here - we want to keep output clean and avoid redundant "exit code" notices.
        except Exception as exc:
            stage_status = "failed"
            stage_error = f"{type(exc).__name__}: {exc}"
            print(f"[error] {type(exc).__name__}: {exc}\n")
        finally:
            if progress_ui is not None:
                try:
                    if pipe_idx is not None:
                        progress_ui.finish_pipe(
                            int(pipe_idx),
                            force_complete=(stage_status == "completed")
                        )
                except Exception:
                    pass
                try:
                    progress_ui.stop()
                except Exception:
                    pass
                try:
                    if hasattr(ctx, "set_live_progress"):
                        ctx.set_live_progress(None)
                except Exception:
                    pass
            # Do not keep stage tables around after a single command; it can cause
            # later @ selections to bind to stale tables (e.g. old add-file scans).
            try:
                if hasattr(ctx, "set_current_stage_table"):
                    ctx.set_current_stage_table(None)
            except Exception:
                pass
            try:
                if hasattr(ctx, "clear_current_cmdlet_name"):
                    ctx.clear_current_cmdlet_name()
            except Exception:
                pass
            try:
                if hasattr(ctx, "clear_current_stage_text"):
                    ctx.clear_current_stage_text()
            except Exception:
                pass
            ctx.clear_last_selection()
            if stage_session:
                stage_session.close(status=stage_status, error_msg=stage_error)


class PipelineExecutor:

    def __init__(self, *, config_loader: ConfigLoader) -> None:
        self._config_loader = config_loader
        self._toolbar_output: Optional[Callable[[str], None]] = None

    def set_toolbar_output(self, output: Optional[Callable[[str], None]]) -> None:
        self._toolbar_output = output

    @staticmethod
    def _split_stages(tokens: Sequence[str]) -> List[List[str]]:
        stages: List[List[str]] = []
        current: List[str] = []
        for token in tokens:
            if token == "|":
                if current:
                    stages.append(current)
                    current = []
            else:
                current.append(token)
        if current:
            stages.append(current)
        return stages

    @staticmethod
    def _validate_download_file_relationship_order(stages: List[List[str]]) -> bool:
        """Guard against running add-relationship on unstored download-file results.

        Intended UX:
            download-file ... | add-file -store <store> | add-relationship

        Rationale:
            download-file outputs items that may not yet have a stable store+hash.
            add-relationship is designed to operate in store/hash mode.
        """

        def _norm(name: str) -> str:
            return str(name or "").replace("_", "-").strip().lower()

        names: List[str] = []
        for stage in stages or []:
            if not stage:
                continue
            names.append(_norm(stage[0]))

        dl_idxs = [i for i, n in enumerate(names) if n == "download-file"]
        rel_idxs = [i for i, n in enumerate(names) if n == "add-relationship"]
        add_file_idxs = [i for i, n in enumerate(names) if n == "add-file"]

        if not dl_idxs or not rel_idxs:
            return True

        # If download-file is upstream of add-relationship, require an add-file in between.
        for rel_i in rel_idxs:
            dl_before = [d for d in dl_idxs if d < rel_i]
            if not dl_before:
                continue
            dl_i = max(dl_before)
            if not any(dl_i < a < rel_i for a in add_file_idxs):
                print(
                    "Pipeline order error: when using download-file with add-relationship, "
                    "add-relationship must come after add-file (so items are stored and have store+hash).\n"
                    "Example: download-file <...> | add-file -store <store> | add-relationship\n"
                )
                return False

        return True

    @staticmethod
    def _try_clear_pipeline_stop(ctx: Any) -> None:
        try:
            if hasattr(ctx, "clear_pipeline_stop"):
                ctx.clear_pipeline_stop()
        except Exception:
            pass

    @staticmethod
    def _maybe_seed_current_stage_table(ctx: Any) -> None:
        try:
            if hasattr(ctx,
                       "get_current_stage_table") and not ctx.get_current_stage_table():
                display_table = (
                    ctx.get_display_table() if hasattr(ctx,
                                                       "get_display_table") else None
                )
                if display_table:
                    ctx.set_current_stage_table(display_table)
                else:
                    last_table = (
                        ctx.get_last_result_table()
                        if hasattr(ctx,
                                   "get_last_result_table") else None
                    )
                    if last_table:
                        ctx.set_current_stage_table(last_table)
        except Exception:
            pass

    @staticmethod
    def _maybe_apply_pending_pipeline_tail(ctx: Any,
                                           stages: List[List[str]]) -> List[List[str]]:
        try:
            pending_tail = (
                ctx.get_pending_pipeline_tail()
                if hasattr(ctx,
                           "get_pending_pipeline_tail") else []
            )
            pending_source = (
                ctx.get_pending_pipeline_source()
                if hasattr(ctx,
                           "get_pending_pipeline_source") else None
            )
        except Exception:
            pending_tail = []
            pending_source = None

        try:
            current_source = (
                ctx.get_current_stage_table_source_command()
                if hasattr(ctx,
                           "get_current_stage_table_source_command") else None
            )
        except Exception:
            current_source = None

        try:
            effective_source = current_source or (
                ctx.get_last_result_table_source_command()
                if hasattr(ctx,
                           "get_last_result_table_source_command") else None
            )
        except Exception:
            effective_source = current_source

        selection_only = bool(
            len(stages) == 1 and stages[0] and stages[0][0].startswith("@")
        )
        if pending_tail and selection_only:
            if (pending_source is None) or (effective_source
                                            and pending_source == effective_source):
                stages = list(stages) + list(pending_tail)
                try:
                    if hasattr(ctx, "clear_pending_pipeline_tail"):
                        ctx.clear_pending_pipeline_tail()
                except Exception:
                    pass
            else:
                try:
                    if hasattr(ctx, "clear_pending_pipeline_tail"):
                        ctx.clear_pending_pipeline_tail()
                except Exception:
                    pass
        return stages

    def _apply_quiet_background_flag(self, config: Any) -> Any:
        if isinstance(config, dict):
            # This executor is used by both the REPL and the `pipeline` subcommand.
            # Quiet/background mode is helpful for detached/background runners, but
            # it suppresses interactive UX (like the pipeline Live progress UI).
            config["_quiet_background_output"] = bool(self._toolbar_output is None)
        return config

    @staticmethod
    def _extract_first_stage_selection_tokens(
        stages: List[List[str]],
    ) -> tuple[List[List[str]],
               List[int],
               bool,
               bool]:
        first_stage_tokens = stages[0] if stages else []
        first_stage_selection_indices: List[int] = []
        first_stage_had_extra_args = False
        first_stage_select_all = False

        if first_stage_tokens:
            new_first_stage: List[str] = []
            for token in first_stage_tokens:
                if token.startswith("@"):  # selection
                    selection = SelectionSyntax.parse(token)
                    if selection is not None:
                        first_stage_selection_indices = sorted(
                            [i - 1 for i in selection]
                        )
                        continue
                    if token == "@*":
                        first_stage_select_all = True
                        continue
                new_first_stage.append(token)

            if new_first_stage:
                stages = list(stages)
                stages[0] = new_first_stage
                if first_stage_selection_indices or first_stage_select_all:
                    first_stage_had_extra_args = True
            elif first_stage_selection_indices or first_stage_select_all:
                stages = list(stages)
                stages.pop(0)

        return (
            stages,
            first_stage_selection_indices,
            first_stage_had_extra_args,
            first_stage_select_all,
        )

    @staticmethod
    def _apply_select_all_if_requested(ctx: Any,
                                       indices: List[int],
                                       select_all: bool) -> List[int]:
        if not select_all:
            return indices
        try:
            last_items = ctx.get_last_result_items()
        except Exception:
            last_items = None
        if last_items:
            return list(range(len(last_items)))
        return indices

    @staticmethod
    def _maybe_run_class_selector(
        ctx: Any,
        config: Any,
        selected_items: list,
        *,
        stage_is_last: bool
    ) -> bool:
        if not stage_is_last:
            return False

        candidates: list[str] = []
        seen: set[str] = set()

        def _add(value) -> None:
            try:
                text = str(value or "").strip().lower()
            except Exception:
                return
            if not text or text in seen:
                return
            seen.add(text)
            candidates.append(text)

        try:
            current_table = ctx.get_current_stage_table() or ctx.get_last_result_table()
            _add(
                current_table.
                table if current_table and hasattr(current_table,
                                                   "table") else None
            )

            # Prefer an explicit provider hint from table metadata when available.
            # This keeps @N selectors working even when row payloads don't carry a
            # provider key (or when they carry a table-type like tidal.album).
            try:
                meta = (
                    current_table.get_table_metadata()
                    if current_table is not None and hasattr(current_table, "get_table_metadata")
                    else getattr(current_table, "table_metadata", None)
                )
            except Exception:
                meta = None
            if isinstance(meta, dict):
                _add(meta.get("provider"))
        except Exception:
            pass

        for item in selected_items or []:
            if isinstance(item, dict):
                _add(item.get("provider"))
                _add(item.get("store"))
                _add(item.get("table"))
            else:
                _add(getattr(item, "provider", None))
                _add(getattr(item, "store", None))
                _add(getattr(item, "table", None))

        try:
            from ProviderCore.registry import get_provider, is_known_provider_name
        except Exception:
            get_provider = None  # type: ignore
            is_known_provider_name = None  # type: ignore

        # If we have a table-type like "tidal.album", also try its provider prefix ("tidal")
        # when that prefix is a registered provider name.
        if is_known_provider_name is not None:
            try:
                for key in list(candidates):
                    if not isinstance(key, str):
                        continue
                    if "." not in key:
                        continue
                    if is_known_provider_name(key):
                        continue
                    prefix = str(key).split(".", 1)[0].strip().lower()
                    if prefix and is_known_provider_name(prefix):
                        _add(prefix)
            except Exception:
                pass

        if get_provider is not None:
            for key in candidates:
                try:
                    if is_known_provider_name is not None and (
                            not is_known_provider_name(key)):
                        continue
                except Exception:
                    # If the predicate fails for any reason, fall back to legacy behavior.
                    pass
                try:
                    provider = get_provider(key, config)
                except Exception:
                    continue
                selector = getattr(provider, "selector", None)
                if selector is None:
                    continue
                try:
                    handled = bool(
                        selector(selected_items,
                                 ctx=ctx,
                                 stage_is_last=True)
                    )
                except Exception as exc:
                    print(f"{key} selector failed: {exc}\n")
                    return True
                if handled:
                    return True

        store_keys: list[str] = []
        for item in selected_items or []:
            if isinstance(item, dict):
                v = item.get("store")
            else:
                v = getattr(item, "store", None)
            name = str(v or "").strip()
            if name:
                store_keys.append(name)

        if store_keys:
            try:
                from Store.registry import Store as StoreRegistry

                store_registry = StoreRegistry(config, suppress_debug=True)
                _backend_names = list(store_registry.list_backends() or [])
                _backend_by_lower = {
                    str(n).lower(): str(n)
                    for n in _backend_names if str(n).strip()
                }
                for name in store_keys:
                    resolved_name = name
                    if not store_registry.is_available(resolved_name):
                        resolved_name = _backend_by_lower.get(str(name).lower(), name)
                    if not store_registry.is_available(resolved_name):
                        continue
                    backend = store_registry[resolved_name]
                    selector = getattr(backend, "selector", None)
                    if selector is None:
                        continue
                    handled = bool(
                        selector(selected_items,
                                 ctx=ctx,
                                 stage_is_last=True)
                    )
                    if handled:
                        return True
            except Exception:
                pass

        return False

    @staticmethod
    def _summarize_stage_text(stage_tokens: Sequence[str], limit: int = 140) -> str:
        combined = " ".join(str(tok) for tok in stage_tokens if tok is not None).strip()
        if not combined:
            return ""
        normalized = re.sub(r"\s+", " ", combined)
        if len(normalized) <= limit:
            return normalized
        return normalized[:limit - 3].rstrip() + "..."

    @staticmethod
    def _log_pipeline_event(
        worker_manager: Any,
        worker_id: Optional[str],
        message: str,
    ) -> None:
        if not worker_manager or not worker_id or not message:
            return
        try:
            timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
        except Exception:
            timestamp = ""
        if timestamp:
            text = f"{timestamp} - PIPELINE - {message}"
        else:
            text = f"PIPELINE - {message}"
        try:
            worker_manager.append_stdout(worker_id, text + "\n", channel="log")
        except Exception:
            pass

    @staticmethod
    def _maybe_open_url_selection(
        current_table: Any,
        selected_items: list,
        *,
        stage_is_last: bool
    ) -> bool:
        if not stage_is_last:
            return False
        if not selected_items or len(selected_items) != 1:
            return False

        table_type = ""
        source_cmd = ""
        try:
            table_type = str(getattr(current_table, "table", "") or "").strip().lower()
        except Exception:
            table_type = ""
        try:
            source_cmd = (
                str(getattr(current_table,
                            "source_command",
                            "") or "").strip().replace("_",
                                                       "-").lower()
            )
        except Exception:
            source_cmd = ""

        if table_type != "url" and source_cmd != "get-url":
            return False

        item = selected_items[0]
        url = None
        try:
            from cmdlet._shared import get_field

            url = get_field(item, "url")
        except Exception:
            try:
                url = item.get("url") if isinstance(item,
                                                    dict
                                                    ) else getattr(item,
                                                                   "url",
                                                                   None)
            except Exception:
                url = None

        url_text = str(url or "").strip()
        if not url_text:
            return False

        try:
            import webbrowser

            webbrowser.open(url_text, new=2)
            return True
        except Exception:
            return False

    def _maybe_enable_background_notifier(
        self,
        worker_manager: Any,
        config: Any,
        pipeline_session: Any
    ) -> None:
        if not (pipeline_session and worker_manager and isinstance(config, dict)):
            return

        session_worker_ids = config.get("_session_worker_ids")
        if not session_worker_ids:
            return

        try:
            output_fn = self._toolbar_output
            quiet_mode = bool(config.get("_quiet_background_output"))
            terminal_only = quiet_mode and not output_fn
            kwargs: Dict[str,
                         Any] = {
                             "session_worker_ids": session_worker_ids,
                             "only_terminal_updates": terminal_only,
                             "overlay_mode": bool(output_fn),
                         }
            if output_fn:
                kwargs["output"] = output_fn
            ensure_background_notifier(worker_manager, **kwargs)
        except Exception:
            pass

    @staticmethod
    def _get_raw_stage_texts(ctx: Any) -> List[str]:
        raw_stage_texts: List[str] = []
        try:
            if hasattr(ctx, "get_current_command_stages"):
                raw_stage_texts = ctx.get_current_command_stages() or []
        except Exception:
            raw_stage_texts = []
        return raw_stage_texts

    def _maybe_apply_initial_selection(
        self,
        ctx: Any,
        config: Any,
        stages: List[List[str]],
        *,
        selection_indices: List[int],
        first_stage_had_extra_args: bool,
        worker_manager: Any,
        pipeline_session: Any,
    ) -> tuple[bool,
               Any]:
        if not selection_indices:
            return True, None

        # Selection should operate on the *currently displayed* selectable table.
        # Some navigation flows (e.g. @.. back) can show a display table without
        # updating current_stage_table. Provider selectors rely on current_stage_table
        # to detect table type (e.g. tidal.album -> tracks), so sync it here.
        display_table = None
        try:
            display_table = (
                ctx.get_display_table() if hasattr(ctx, "get_display_table") else None
            )
        except Exception:
            display_table = None

        current_stage_table = None
        try:
            current_stage_table = (
                ctx.get_current_stage_table()
                if hasattr(ctx, "get_current_stage_table") else None
            )
        except Exception:
            current_stage_table = None

        try:
            if display_table is not None and hasattr(ctx, "set_current_stage_table"):
                ctx.set_current_stage_table(display_table)
            elif current_stage_table is None and hasattr(ctx, "set_current_stage_table"):
                last_table = (
                    ctx.get_last_result_table()
                    if hasattr(ctx, "get_last_result_table") else None
                )
                if last_table is not None:
                    ctx.set_current_stage_table(last_table)
        except Exception:
            pass

        source_cmd = None
        source_args_raw = None
        try:
            source_cmd = ctx.get_current_stage_table_source_command()
            source_args_raw = ctx.get_current_stage_table_source_args()
        except Exception:
            source_cmd = None
            source_args_raw = None

        if isinstance(source_args_raw, str):
            source_args: List[str] = [source_args_raw]
        elif isinstance(source_args_raw, list):
            source_args = [str(x) for x in source_args_raw if x is not None]
        else:
            source_args = []

        current_table = None
        try:
            current_table = ctx.get_current_stage_table()
        except Exception:
            current_table = None
        table_type = (
            current_table.table if current_table and hasattr(current_table,
                                                             "table") else None
        )

        command_expanded = False
        example_selector_triggered = False
        normalized_source_cmd = str(source_cmd or "").replace("_", "-").strip().lower()

        if normalized_source_cmd in HELP_EXAMPLE_SOURCE_COMMANDS and selection_indices:
            try:
                idx = selection_indices[0]
                row_args = ctx.get_current_stage_table_row_selection_args(idx)
            except Exception:
                row_args = None
            tokens: List[str] = []
            if isinstance(row_args, list) and row_args:
                tokens = [str(x) for x in row_args if x is not None]
            if tokens:
                stage_groups = _split_pipeline_tokens(tokens)
                if stage_groups:
                    for stage in reversed(stage_groups):
                        stages.insert(0, stage)
                    selection_indices = []
                    command_expanded = True
                    example_selector_triggered = True

        if not example_selector_triggered:
            if table_type in {"youtube",
                              "soulseek"}:
                command_expanded = False
            elif source_cmd == "search-file" and source_args and "youtube" in source_args:
                command_expanded = False
            else:
                selected_row_args: List[str] = []
                skip_pipe_expansion = source_cmd in {".pipe", ".mpv"} and len(stages) > 0
                # Command expansion via @N:
                # - Default behavior: expand ONLY for single-row selections.
                # - Special case: allow multi-row expansion for add-file directory tables by
                #   combining selected rows into a single `-path file1,file2,...` argument.
                if source_cmd and not skip_pipe_expansion:
                    src = str(source_cmd).replace("_", "-").strip().lower()

                    if src == "add-file" and selection_indices:
                        row_args_list: List[List[str]] = []
                        for idx in selection_indices:
                            try:
                                row_args = ctx.get_current_stage_table_row_selection_args(
                                    idx
                                )
                            except Exception:
                                row_args = None
                            if isinstance(row_args, list) and row_args:
                                row_args_list.append(
                                    [str(x) for x in row_args if x is not None]
                                )

                        # Combine `['-path', <file>]` from each row into one `-path` arg.
                        paths: List[str] = []
                        can_merge = bool(row_args_list) and (
                            len(row_args_list) == len(selection_indices)
                        )
                        if can_merge:
                            for ra in row_args_list:
                                if len(ra) == 2 and str(ra[0]).strip().lower() in {
                                        "-path",
                                        "--path",
                                        "-p",
                                }:
                                    p = str(ra[1]).strip()
                                    if p:
                                        paths.append(p)
                                else:
                                    can_merge = False
                                    break

                        if can_merge and paths:
                            selected_row_args.extend(["-path", ",".join(paths)])
                        elif len(selection_indices) == 1 and row_args_list:
                            selected_row_args.extend(row_args_list[0])
                    else:
                        # Only perform @N command expansion for *single-item* selections.
                        # For multi-item selections (e.g. @*, @1-5), expanding to one row
                        # would silently drop items. In those cases we pipe items downstream.
                        if len(selection_indices) == 1:
                            idx = selection_indices[0]
                            row_args = ctx.get_current_stage_table_row_selection_args(idx)
                            if row_args:
                                selected_row_args.extend(row_args)

                if selected_row_args:
                    if isinstance(source_cmd, list):
                        cmd_list: List[str] = [str(x) for x in source_cmd if x is not None]
                    elif isinstance(source_cmd, str):
                        cmd_list = [source_cmd]
                    else:
                        cmd_list = []

                        # IMPORTANT: Put selected row args *before* source_args.
                        # Rationale: The cmdlet argument parser treats the *first* unknown
                        # token as a positional value (e.g., URL). If `source_args`
                        # contain unknown flags (like -provider which download-file does
                        # not declare), they could be misinterpreted as the positional
                        # URL argument and cause attempts to download strings like
                        # "-provider" (which is invalid). By placing selection args
                        # first we ensure the intended URL/selection token is parsed
                        # as the positional URL and avoid this class of parsing errors.
                        expanded_stage: List[str] = cmd_list + selected_row_args + source_args

                        if first_stage_had_extra_args and stages:
                            expanded_stage += stages[0]
                            stages[0] = expanded_stage
                        else:
                            stages.insert(0, expanded_stage)

                        if pipeline_session and worker_manager:
                            try:
                                worker_manager.log_step(
                                    pipeline_session.worker_id,
                                    f"@N expansion: {source_cmd} + selected_args={selected_row_args} + source_args={source_args}",
                                )
                            except Exception:
                                pass

            stage_table = None
            try:
                stage_table = ctx.get_current_stage_table()
            except Exception:
                stage_table = None

            display_table = None
            try:
                display_table = (
                    ctx.get_display_table() if hasattr(ctx,
                                                       "get_display_table") else None
                )
            except Exception:
                display_table = None

            if not stage_table and display_table is not None:
                stage_table = display_table
            if not stage_table:
                try:
                    stage_table = ctx.get_last_result_table()
                except Exception:
                    stage_table = None

            # Prefer selecting from the last selectable *table* (search/playlist)
            # rather than from display-only emitted items, unless we're explicitly
            # selecting from an overlay table.
            try:
                if display_table is not None and stage_table is display_table:
                    items_list = ctx.get_last_result_items() or []
                else:
                    if hasattr(ctx, "get_last_selectable_result_items"):
                        items_list = ctx.get_last_selectable_result_items() or []
                    else:
                        items_list = ctx.get_last_result_items() or []
            except Exception:
                items_list = []

            resolved_items = items_list if items_list else []
            if items_list:
                filtered = [
                    resolved_items[i] for i in selection_indices
                    if 0 <= i < len(resolved_items)
                ]
                if not filtered:
                    print("No items matched selection in pipeline\n")
                    return False, None

                # Provider selection expansion (non-terminal): allow certain provider tables
                # (e.g. tidal.album) to expand to multiple downstream items when the user
                # pipes into another stage (e.g. @N | .mpv or @N | add-file).
                table_type_hint = None
                try:
                    table_type_hint = (
                        stage_table.table
                        if stage_table is not None and hasattr(stage_table, "table")
                        else None
                    )
                except Exception:
                    table_type_hint = None

                if stages and isinstance(table_type_hint, str) and table_type_hint.strip().lower() == "tidal.album":
                    try:
                        from ProviderCore.registry import get_provider

                        prov = get_provider("tidal", config)
                    except Exception:
                        prov = None

                    if prov is not None and hasattr(prov, "_extract_album_selection_context") and hasattr(prov, "_tracks_for_album"):
                        try:
                            album_contexts = prov._extract_album_selection_context(filtered)  # type: ignore[attr-defined]
                        except Exception:
                            album_contexts = []

                        track_items: List[Any] = []
                        seen_track_ids: set[int] = set()
                        for album_id, album_title, artist_name in album_contexts or []:
                            try:
                                track_results = prov._tracks_for_album(  # type: ignore[attr-defined]
                                    album_id=album_id,
                                    album_title=album_title,
                                    artist_name=artist_name,
                                    limit=500,
                                )
                            except Exception:
                                track_results = []
                            for tr in track_results or []:
                                try:
                                    md = getattr(tr, "full_metadata", None)
                                    tid = None
                                    if isinstance(md, dict):
                                        raw_id = md.get("trackId") or md.get("id")
                                        try:
                                            tid = int(raw_id) if raw_id is not None else None
                                        except Exception:
                                            tid = None
                                    if tid is not None:
                                        if tid in seen_track_ids:
                                            continue
                                        seen_track_ids.add(tid)
                                except Exception:
                                    pass
                                track_items.append(tr)

                        if track_items:
                            filtered = track_items
                            table_type_hint = "tidal.track"

                if PipelineExecutor._maybe_run_class_selector(
                        ctx,
                        config,
                        filtered,
                        stage_is_last=(not stages)):
                    return False, None

                from cmdlet._shared import coerce_to_pipe_object

                filtered_pipe_objs = [coerce_to_pipe_object(item) for item in filtered]
                piped_result = (
                    filtered_pipe_objs
                    if len(filtered_pipe_objs) > 1 else filtered_pipe_objs[0]
                )

                if pipeline_session and worker_manager:
                    try:
                        selection_parts = [f"@{i+1}" for i in selection_indices]
                        worker_manager.log_step(
                            pipeline_session.worker_id,
                            f"Applied @N selection {' | '.join(selection_parts)}",
                        )
                    except Exception:
                        pass

                # Auto-insert downloader stages for provider tables.
                try:
                    current_table = ctx.get_current_stage_table()
                    if current_table is None and hasattr(ctx, "get_display_table"):
                        current_table = ctx.get_display_table()
                    if current_table is None:
                        current_table = ctx.get_last_result_table()
                except Exception:
                    current_table = None
                table_type = None
                try:
                    if isinstance(table_type_hint, str) and table_type_hint.strip():
                        table_type = table_type_hint
                    else:
                        table_type = (
                            current_table.table
                            if current_table and hasattr(current_table, "table") else None
                        )
                except Exception:
                    table_type = (
                        current_table.table
                        if current_table and hasattr(current_table, "table") else None
                    )

                def _norm_cmd(name: Any) -> str:
                    return str(name or "").replace("_", "-").strip().lower()

                auto_stage = None
                if isinstance(table_type, str) and table_type:
                    try:
                        from ProviderCore.registry import selection_auto_stage_for_table

                        auto_stage = selection_auto_stage_for_table(table_type)
                    except Exception:
                        auto_stage = None

                def _apply_row_action_to_stage(stage_idx: int) -> bool:
                    if not selection_indices or len(selection_indices) != 1:
                        return False
                    try:
                        row_action = ctx.get_current_stage_table_row_selection_action(
                            selection_indices[0]
                        )
                    except Exception:
                        row_action = None
                    if not row_action:
                        # Fallback to serialized payload when the table row is unavailable
                        try:
                            items = ctx.get_last_result_items() or []
                            if 0 <= selection_indices[0] < len(items):
                                maybe = items[selection_indices[0]]
                                if isinstance(maybe, dict):
                                    candidate = maybe.get("_selection_action")
                                    if isinstance(candidate, (list, tuple)):
                                        row_action = [str(x) for x in candidate if x is not None]
                                        debug(f"@N row {selection_indices[0]} restored action from payload: {row_action}")
                        except Exception:
                            row_action = row_action or None
                    if not row_action:
                        debug(f"@N row {selection_indices[0]} has no selection_action")
                        return False
                    normalized = [str(x) for x in row_action if x is not None]
                    if not normalized:
                        return False
                    debug(f"Applying row action for row {selection_indices[0]} -> {normalized}")
                    if 0 <= stage_idx < len(stages):
                        debug(f"Replacing stage {stage_idx} {stages[stage_idx]} with row action {normalized}")
                        stages[stage_idx] = normalized
                        return True
                    return False

                if not stages:
                    if isinstance(table_type, str) and table_type.startswith("metadata."):
                        print("Auto-applying metadata selection via get-tag")
                        stages.append(["get-tag"])
                    elif auto_stage:
                        try:
                            print(f"Auto-running selection via {auto_stage[0]}")
                        except Exception:
                            pass
                        # Append the auto stage now. If the user also provided a selection
                        # (e.g., @1 | add-file ...), we want to attach the row selection
                        # args *to the auto-inserted stage* so the download command receives
                        # the selected row information immediately.
                        stages.append(list(auto_stage))
                        debug(f"Inserted auto stage before row action: {stages[-1]}")

                        # If the caller included a selection (e.g., @1) try to attach
                        # the selection args immediately to the inserted auto stage so
                        # the expansion is effective in a single pass.
                        if selection_indices:
                            try:
                                if not _apply_row_action_to_stage(len(stages) - 1):
                                    # Only support single-row selection for auto-attach here
                                    if len(selection_indices) == 1:
                                        idx = selection_indices[0]
                                        row_args = ctx.get_current_stage_table_row_selection_args(idx)
                                        if not row_args:
                                            try:
                                                items = ctx.get_last_result_items() or []
                                                if 0 <= idx < len(items):
                                                    maybe = items[idx]
                                                    if isinstance(maybe, dict):
                                                        candidate = maybe.get("_selection_args")
                                                        if isinstance(candidate, (list, tuple)):
                                                            row_args = [str(x) for x in candidate if x is not None]
                                            except Exception:
                                                row_args = row_args or None
                                        if row_args:
                                            # Place selection args before any existing source args
                                            inserted = stages[-1]
                                            if inserted:
                                                cmd = inserted[0]
                                                tail = [str(x) for x in inserted[1:]]
                                                stages[-1] = [cmd] + [str(x) for x in row_args] + tail
                            except Exception:
                                pass
                else:
                    first_cmd = stages[0][0] if stages and stages[0] else None
                    if isinstance(table_type, str) and table_type.startswith("metadata.") and first_cmd not in (
                            "get-tag",
                            "get_tag",
                            ".pipe",
                            ".mpv",
                    ):
                        print("Auto-inserting get-tag after metadata selection")
                        stages.insert(0, ["get-tag"])
                    elif auto_stage:
                        first_cmd_norm = _norm_cmd(first_cmd)
                        auto_cmd_norm = _norm_cmd(auto_stage[0])
                        if first_cmd_norm not in (auto_cmd_norm, ".pipe", ".mpv"):
                            debug(f"Auto-inserting {auto_cmd_norm} after selection")
                            # Insert the auto stage before the user-specified stage
                            # Note: Do NOT append source_args here - they are search tokens from
                            # the previous stage and should not be passed to the downloader.
                            stages.insert(0, list(auto_stage))
                            debug(f"Inserted auto stage before existing pipeline: {stages[0]}")

                            # If a selection is present, attach the row selection args to the
                            # newly-inserted stage so the download stage runs with the
                            # selected row information.
                            if selection_indices:
                                try:
                                    if not _apply_row_action_to_stage(0):
                                        if len(selection_indices) == 1:
                                            idx = selection_indices[0]
                                            row_args = ctx.get_current_stage_table_row_selection_args(idx)
                                            if not row_args:
                                                try:
                                                    items = ctx.get_last_result_items() or []
                                                    if 0 <= idx < len(items):
                                                        maybe = items[idx]
                                                        if isinstance(maybe, dict):
                                                            candidate = maybe.get("_selection_args")
                                                            if isinstance(candidate, (list, tuple)):
                                                                row_args = [str(x) for x in candidate if x is not None]
                                                except Exception:
                                                    row_args = row_args or None
                                            if row_args:
                                                inserted = stages[0]
                                                if inserted:
                                                    cmd = inserted[0]
                                                    tail = [str(x) for x in inserted[1:]]
                                                    stages[0] = [cmd] + [str(x) for x in row_args] + tail
                                except Exception:
                                    pass

                # After inserting/appending an auto-stage, continue processing so later
                # selection-expansion logic can still run (e.g., for example selectors).
                return True, piped_result
            else:
                print("No previous results to select from\n")
                return False, None

        return True, None

    @staticmethod
    def _maybe_start_live_progress(config: Any,
                                   stages: List[List[str]]) -> tuple[Any,
                                                                     Dict[int,
                                                                          int]]:
        progress_ui = None
        pipe_index_by_stage: Dict[int,
                                  int] = {}

        try:
            quiet_mode = (
                bool(config.get("_quiet_background_output"))
                if isinstance(config,
                              dict) else False
            )
        except Exception:
            quiet_mode = False

        try:
            import sys as _sys

            if (not quiet_mode) and bool(getattr(_sys.stderr,
                                                 "isatty", lambda: False)()):
                from SYS.models import PipelineLiveProgress

                pipe_stage_indices: List[int] = []
                pipe_labels: List[str] = []
                for idx, stage_tokens in enumerate(stages):
                    if not stage_tokens:
                        continue
                    name = str(stage_tokens[0]).replace("_", "-").lower()
                    if name == "@" or name.startswith("@"):
                        continue

                    # add-file directory selector stage: avoid Live progress so the
                    # selection table renders cleanly.
                    if name in {"add-file",
                                "add_file"}:
                        try:
                            from pathlib import Path as _Path

                            toks = list(stage_tokens[1:])
                            i = 0
                            while i < len(toks):
                                t = str(toks[i])
                                low = t.lower().strip()
                                if low in {"-path",
                                           "--path",
                                           "-p"} and i + 1 < len(toks):
                                    nxt = str(toks[i + 1])
                                    if nxt and ("," not in nxt):
                                        p = _Path(nxt)
                                        if p.exists() and p.is_dir():
                                            name = ""  # mark as skipped
                                            break
                                    i += 2
                                    continue
                                i += 1
                        except Exception:
                            pass
                        if not name:
                            continue
                    # Display-only: avoid Live progress for relationship viewing.
                    # This keeps `@1 | get-relationship` clean and prevents progress UI
                    # from interfering with Rich tables/panels.
                    if name in {"get-relationship",
                                "get-rel"}:
                        continue
                    # `.pipe` (MPV) is an interactive launcher; disable pipeline Live progress
                    # for it because it doesn't meaningfully "complete" (mpv may keep running)
                    # and Live output interferes with MPV playlist UI.
                    if name in {".pipe", ".mpv"}:
                        continue
                    # `.matrix` uses a two-phase picker (@N then .matrix -send). Pipeline Live
                    # progress can linger across those phases and interfere with interactive output.
                    if name == ".matrix":
                        continue
                    # `delete-file` prints a Rich table directly; Live progress interferes and
                    # can truncate/overwrite the output.
                    if name in {"delete-file",
                                "del-file"}:
                        continue
                    pipe_stage_indices.append(idx)
                    pipe_labels.append(name)

                if pipe_labels:
                    progress_ui = PipelineLiveProgress(pipe_labels, enabled=True)
                    progress_ui.start()
                    try:
                        from SYS import pipeline as _pipeline_ctx

                        if hasattr(_pipeline_ctx, "set_live_progress"):
                            _pipeline_ctx.set_live_progress(progress_ui)
                    except Exception:
                        pass
                    pipe_index_by_stage = {
                        stage_idx: pipe_idx
                        for pipe_idx, stage_idx in enumerate(pipe_stage_indices)
                    }
        except Exception:
            progress_ui = None
            pipe_index_by_stage = {}

        return progress_ui, pipe_index_by_stage

    def execute_tokens(self, tokens: List[str]) -> None:
        from cmdlet import REGISTRY
        from SYS import pipeline as ctx

        try:
            self._try_clear_pipeline_stop(ctx)

            # REPL guard: stage-local tables should not persist across independent
            # commands. Selection stages can always seed from last/display tables.
            try:
                if hasattr(ctx, "set_current_stage_table"):
                    ctx.set_current_stage_table(None)
            except Exception:
                pass

            # Preflight (URL-duplicate prompts, etc.) should be cached within a single
            # pipeline run, not across independent pipelines.
            try:
                ctx.store_value("preflight",
                                {})
            except Exception:
                pass

            stages = self._split_stages(tokens)
            if not stages:
                print("Invalid pipeline syntax\n")
                return
            self._maybe_seed_current_stage_table(ctx)
            stages = self._maybe_apply_pending_pipeline_tail(ctx, stages)
            config = self._config_loader.load()
            config = self._apply_quiet_background_flag(config)

            (
                stages,
                first_stage_selection_indices,
                first_stage_had_extra_args,
                first_stage_select_all,
            ) = self._extract_first_stage_selection_tokens(stages)
            first_stage_selection_indices = self._apply_select_all_if_requested(
                ctx,
                first_stage_selection_indices,
                first_stage_select_all
            )

            piped_result: Any = None
            worker_manager = WorkerManagerRegistry.ensure(config)
            pipeline_text = " | ".join(" ".join(stage) for stage in stages)
            pipeline_session = WorkerStages.begin_pipeline(
                worker_manager,
                pipeline_text=pipeline_text,
                config=config
            )
            if pipeline_session and worker_manager:
                self._log_pipeline_event(
                    worker_manager,
                    pipeline_session.worker_id,
                    f"Pipeline start: {pipeline_text or '(empty pipeline)'}",
                )
            raw_stage_texts = self._get_raw_stage_texts(ctx)
            self._maybe_enable_background_notifier(
                worker_manager,
                config,
                pipeline_session
            )

            pipeline_status = "completed"
            pipeline_error = ""

            progress_ui = None
            pipe_index_by_stage: Dict[int,
                                      int] = {}

            try:
                ok, initial_piped = self._maybe_apply_initial_selection(
                    ctx,
                    config,
                    stages,
                    selection_indices=first_stage_selection_indices,
                    first_stage_had_extra_args=first_stage_had_extra_args,
                    worker_manager=worker_manager,
                    pipeline_session=pipeline_session,
                )
                if not ok:
                    return
                if initial_piped is not None:
                    piped_result = initial_piped

                # REPL guard: prevent add-relationship before add-file for download-file pipelines.
                if not self._validate_download_file_relationship_order(stages):
                    pipeline_status = "failed"
                    pipeline_error = "Invalid pipeline order"
                    return

                # ------------------------------------------------------------------
                # Multi-level pipeline progress (pipes = stages, tasks = items)
                # ------------------------------------------------------------------
                progress_ui, pipe_index_by_stage = self._maybe_start_live_progress(config, stages)

                for stage_index, stage_tokens in enumerate(stages):
                    if not stage_tokens:
                        continue

                    raw_stage_name = str(stage_tokens[0])
                    cmd_name = raw_stage_name.replace("_", "-").lower()
                    stage_args = stage_tokens[1:]

                    if cmd_name == "@":
                        # Prefer piping the last emitted/visible items (e.g. add-file results)
                        # over the result-table subject. The subject can refer to older context
                        # (e.g. a playlist row) and may not contain store+hash.
                        last_items = None
                        try:
                            last_items = ctx.get_last_result_items()
                        except Exception:
                            last_items = None

                        if last_items:
                            from cmdlet._shared import coerce_to_pipe_object

                            try:
                                pipe_items = [
                                    coerce_to_pipe_object(x) for x in list(last_items)
                                ]
                            except Exception:
                                pipe_items = list(last_items)
                            piped_result = pipe_items if len(pipe_items
                                                             ) > 1 else pipe_items[0]
                            try:
                                ctx.set_last_items(pipe_items)
                            except Exception:
                                pass
                            if pipeline_session and worker_manager:
                                try:
                                    worker_manager.log_step(
                                        pipeline_session.worker_id,
                                        "@ used last result items"
                                    )
                                except Exception:
                                    pass
                            continue

                        subject = ctx.get_last_result_subject()
                        if subject is None:
                            print("No current result context available for '@'\n")
                            pipeline_status = "failed"
                            pipeline_error = "No result items/subject for @"
                            return
                        piped_result = subject
                        try:
                            subject_items = subject if isinstance(subject,
                                                                  list) else [subject]
                            ctx.set_last_items(subject_items)
                        except Exception:
                            pass
                        if pipeline_session and worker_manager:
                            try:
                                worker_manager.log_step(
                                    pipeline_session.worker_id,
                                    "@ used current table subject"
                                )
                            except Exception:
                                pass
                        continue

                    if cmd_name.startswith("@"):  # selection stage
                        selection_token = raw_stage_name
                        selection = SelectionSyntax.parse(selection_token)
                        filter_spec = SelectionFilterSyntax.parse(selection_token)
                        is_select_all = selection_token.strip() == "@*"
                        if selection is None and filter_spec is None and not is_select_all:
                            print(f"Invalid selection: {selection_token}\n")
                            pipeline_status = "failed"
                            pipeline_error = f"Invalid selection {selection_token}"
                            return

                        selected_indices = []
                        # Prefer selecting from the last selectable *table* (search/playlist)
                        # rather than from display-only emitted items, unless we're explicitly
                        # selecting from an overlay table.
                        display_table = None
                        try:
                            display_table = (
                                ctx.get_display_table()
                                if hasattr(ctx,
                                           "get_display_table") else None
                            )
                        except Exception:
                            display_table = None

                        stage_table = ctx.get_current_stage_table()
                        # Selection should operate on the table the user sees.
                        # If a display overlay table exists, force it as the current-stage table
                        # so provider selectors (e.g. tidal.album -> tracks) behave consistently.
                        try:
                            if display_table is not None and hasattr(ctx, "set_current_stage_table"):
                                ctx.set_current_stage_table(display_table)
                                stage_table = display_table
                        except Exception:
                            pass

                        if not stage_table and display_table is not None:
                            stage_table = display_table
                        if not stage_table:
                            stage_table = ctx.get_last_result_table()

                        try:
                            if hasattr(ctx, "debug_table_state"):
                                ctx.debug_table_state(f"selection {selection_token}")
                        except Exception:
                            pass

                        if display_table is not None and stage_table is display_table:
                            items_list = ctx.get_last_result_items() or []
                        else:
                            if hasattr(ctx, "get_last_selectable_result_items"):
                                items_list = ctx.get_last_selectable_result_items(
                                ) or []
                            else:
                                items_list = ctx.get_last_result_items() or []

                        if is_select_all:
                            selected_indices = list(range(len(items_list)))
                        elif filter_spec is not None:
                            selected_indices = [
                                i for i, item in enumerate(items_list)
                                if SelectionFilterSyntax.matches(item, filter_spec)
                            ]
                        else:
                            selected_indices = sorted(
                                [i - 1 for i in selection]
                            )  # type: ignore[arg-type]

                        resolved_items = items_list if items_list else []
                        filtered = [
                            resolved_items[i] for i in selected_indices
                            if 0 <= i < len(resolved_items)
                        ]
                        if not filtered:
                            print("No items matched selection\n")
                            pipeline_status = "failed"
                            pipeline_error = "Empty selection"
                            return

                        # Filter UX: if the stage token is a filter and it's terminal,
                        # render a filtered table overlay rather than selecting/auto-downloading.
                        stage_is_last = (stage_index + 1 >= len(stages))
                        if filter_spec is not None and stage_is_last:
                            try:
                                base_table = stage_table
                                if base_table is None:
                                    base_table = ctx.get_last_result_table()

                                if base_table is not None and hasattr(base_table, "copy_with_title"):
                                    new_table = base_table.copy_with_title(getattr(base_table, "title", "") or "Results")
                                else:
                                    new_table = ResultTable(getattr(base_table, "title", "") if base_table is not None else "Results")

                                try:
                                    if base_table is not None and getattr(base_table, "table", None):
                                        new_table.set_table(str(getattr(base_table, "table")))
                                except Exception:
                                    pass

                                try:
                                    # Attach a one-line header so users see the active filter.
                                    safe = str(selection_token)[1:].strip()
                                    new_table.set_header_line(f'filter: "{safe}"')
                                except Exception:
                                    pass

                                for item in filtered:
                                    new_table.add_result(item)

                                try:
                                    ctx.set_last_result_table_overlay(new_table, items=list(filtered), subject=ctx.get_last_result_subject())
                                except Exception:
                                    pass

                                try:
                                    stdout_console().print()
                                    stdout_console().print(new_table)
                                except Exception:
                                    pass
                            except Exception:
                                pass
                            continue

                        # UX: selecting a single URL row from get-url tables should open it.
                        # Only do this when the selection stage is terminal to avoid surprising
                        # side-effects in pipelines like `@1 | download-file`.
                        current_table = ctx.get_current_stage_table(
                        ) or ctx.get_last_result_table()
                        if (not is_select_all) and (len(filtered) == 1):
                            try:
                                PipelineExecutor._maybe_open_url_selection(
                                    current_table,
                                    filtered,
                                    stage_is_last=(stage_index + 1 >= len(stages)),
                                )
                            except Exception:
                                pass

                        if PipelineExecutor._maybe_run_class_selector(
                            ctx,
                            config,
                            filtered,
                            stage_is_last=(stage_index + 1 >= len(stages))):
                            return

                        # Special case: selecting multiple tags from get-tag and piping into delete-tag
                        # should batch into a single operation (one backend call).
                        next_cmd = None
                        try:
                            if stage_index + 1 < len(stages) and stages[stage_index +
                                                                        1]:
                                next_cmd = str(stages[stage_index + 1][0]
                                               ).replace("_",
                                                         "-").lower()
                        except Exception:
                            next_cmd = None

                        def _is_tag_row(obj: Any) -> bool:
                            try:
                                if (hasattr(obj,
                                            "__class__")
                                        and obj.__class__.__name__ == "TagItem"
                                        and hasattr(obj,
                                                    "tag_name")):
                                    return True
                            except Exception:
                                pass
                            try:
                                if isinstance(obj, dict) and obj.get("tag_name"):
                                    return True
                            except Exception:
                                pass
                            return False

                        if (next_cmd in {"delete-tag",
                                         "delete_tag"} and len(filtered) > 1
                                and all(_is_tag_row(x) for x in filtered)):
                            from cmdlet._shared import get_field

                            tags: List[str] = []
                            first_hash = None
                            first_store = None
                            first_path = None
                            for item in filtered:
                                tag_name = get_field(item, "tag_name")
                                if tag_name:
                                    tags.append(str(tag_name))
                                if first_hash is None:
                                    first_hash = get_field(item, "hash")
                                if first_store is None:
                                    first_store = get_field(item, "store")
                                if first_path is None:
                                    first_path = get_field(item,
                                                           "path") or get_field(
                                                               item,
                                                               "target"
                                                           )

                            if tags:
                                grouped = {
                                    "table": "tag.selection",
                                    "media_kind": "tag",
                                    "hash": first_hash,
                                    "store": first_store,
                                    "path": first_path,
                                    "tag": tags,
                                }
                                piped_result = grouped
                                continue

                        from cmdlet._shared import coerce_to_pipe_object

                        filtered_pipe_objs = [
                            coerce_to_pipe_object(item) for item in filtered
                        ]
                        piped_result = (
                            filtered_pipe_objs
                            if len(filtered_pipe_objs) > 1 else filtered_pipe_objs[0]
                        )

                        current_table = ctx.get_current_stage_table(
                        ) or ctx.get_last_result_table()
                        table_type = (
                            current_table.table
                            if current_table and hasattr(current_table,
                                                         "table") else None
                        )

                        def _norm_stage_cmd(name: Any) -> str:
                            return str(name or "").replace("_", "-").strip().lower()

                        next_cmd = None
                        if stage_index + 1 < len(stages) and stages[stage_index + 1]:
                            next_cmd = _norm_stage_cmd(stages[stage_index + 1][0])

                        auto_stage = None
                        if isinstance(table_type, str) and table_type:
                            try:
                                from ProviderCore.registry import selection_auto_stage_for_table

                                # Preserve historical behavior: only forward selection-stage args
                                # to the auto stage when we are appending a new last stage.
                                at_end = bool(stage_index + 1 >= len(stages))
                                auto_stage = selection_auto_stage_for_table(
                                    table_type,
                                    stage_args if at_end else None,
                                )
                            except Exception:
                                auto_stage = None

                        # Auto-insert downloader stages for provider tables.
                        # IMPORTANT: do not auto-download for filter selections; they may match many rows.
                        if filter_spec is None:
                            if stage_index + 1 >= len(stages):
                                if auto_stage:
                                    try:
                                        print(f"Auto-running selection via {auto_stage[0]}")
                                    except Exception:
                                        pass
                                    stages.append(list(auto_stage))
                            else:
                                if auto_stage:
                                    auto_cmd = _norm_stage_cmd(auto_stage[0])
                                    if next_cmd not in (auto_cmd, ".pipe", ".mpv"):
                                        debug(f"Auto-inserting {auto_cmd} after selection")
                                        stages.insert(stage_index + 1, list(auto_stage))
                        continue

                    cmd_fn = REGISTRY.get(cmd_name)
                    if not cmd_fn:
                        try:
                            mod = import_cmd_module(cmd_name)
                            data = getattr(mod, "CMDLET", None) if mod else None
                            if data and hasattr(data, "exec") and callable(getattr(data, "exec")):
                                run_fn = getattr(data, "exec")
                                REGISTRY[cmd_name] = run_fn
                                cmd_fn = run_fn
                        except Exception:
                            cmd_fn = None
                    if not cmd_fn:
                        print(f"Unknown command: {cmd_name}\n")
                        pipeline_status = "failed"
                        pipeline_error = f"Unknown command: {cmd_name}"
                        return

                    stage_session = WorkerStages.begin_stage(
                        worker_manager,
                        cmd_name=cmd_name,
                        stage_tokens=stage_tokens,
                        config=config,
                        command_text=" ".join(stage_tokens).strip(),
                    )

                    stage_worker_id = stage_session.worker_id if stage_session else None
                    stage_summary = self._summarize_stage_text(stage_tokens)
                    if pipeline_session and worker_manager:
                        summary_text = stage_summary or cmd_name
                        self._log_pipeline_event(
                            worker_manager,
                            pipeline_session.worker_id,
                            f"Stage {stage_index + 1}/{len(stages)} start: {summary_text}",
                        )

                    # Estimate how many per-item tasks this pipe will run.
                    pipe_idx = pipe_index_by_stage.get(stage_index)
                    if progress_ui is not None and pipe_idx is not None:
                        try:
                            # Prefer piped input for task counts.
                            if isinstance(piped_result, list):
                                total_items = len(piped_result)
                                preview_items: Optional[List[Any]] = list(piped_result)
                            elif piped_result is not None:
                                total_items = 1
                                preview_items = [piped_result]
                            else:
                                # First stage without piped input: infer from URL-ish args.
                                preview: List[Any] = []

                                toks = list(stage_tokens[1:])
                                i = 0
                                while i < len(toks):
                                    t = str(toks[i])
                                    low = t.lower().strip()
                                    if (cmd_name == "add-file" and low in {"-path",
                                                                           "--path",
                                                                           "-p"}
                                            and i + 1 < len(toks)):
                                        nxt = str(toks[i + 1])
                                        if nxt:
                                            if "," in nxt:
                                                parts = [
                                                    p.strip().strip("\"'")
                                                    for p in nxt.split(",")
                                                ]
                                                parts = [p for p in parts if p]
                                                if parts:
                                                    preview.extend(parts)
                                                    i += 2
                                                    continue
                                            else:
                                                preview.append(nxt)
                                                i += 2
                                                continue
                                    if low in {"-url",
                                               "--url"} and i + 1 < len(toks):
                                        nxt = str(toks[i + 1])
                                        if nxt and not nxt.startswith("-"):
                                            preview.append(nxt)
                                        i += 2
                                        continue
                                    if (not t.startswith("-")) and ("://" in low
                                                                    or low.startswith(
                                                                        ("magnet:",
                                                                         "torrent:"))):
                                        preview.append(t)
                                    i += 1

                                preview_items = preview if preview else None
                                total_items = len(preview) if preview else 1

                            progress_ui.begin_pipe(
                                pipe_idx,
                                total_items=int(total_items),
                                items_preview=preview_items
                            )
                        except Exception:
                            pass

                    on_emit = None
                    if progress_ui is not None and pipe_idx is not None:
                        _ui = cast(Any, progress_ui)

                        def _on_emit(
                            obj: Any,
                            _idx: int = int(pipe_idx),
                            _progress=_ui
                        ) -> None:
                            try:
                                _progress.on_emit(_idx, obj)
                            except Exception:
                                pass

                        on_emit = _on_emit

                    pipeline_ctx = ctx.PipelineStageContext(
                        stage_index=stage_index,
                        total_stages=len(stages),
                        pipe_index=pipe_idx,
                        worker_id=stage_worker_id,
                        on_emit=on_emit,
                    )
                    ctx.set_stage_context(pipeline_ctx)
                    stage_status = "completed"
                    stage_error = ""

                    stage_label = f"stage {stage_index + 1}/{len(stages)} ({cmd_name})"
                    try:
                        # Avoid leaking interactive selection tables across stages.
                        # (Selection/expansion happens before this loop, so clearing here is safe.)
                        try:
                            if hasattr(ctx, "set_current_stage_table"):
                                ctx.set_current_stage_table(None)
                        except Exception:
                            pass

                        try:
                            if hasattr(ctx, "set_current_cmdlet_name"):
                                ctx.set_current_cmdlet_name(cmd_name)
                        except Exception:
                            pass

                        try:
                            if hasattr(ctx, "set_current_stage_text"):
                                stage_text = ""
                                if raw_stage_texts and stage_index < len(raw_stage_texts
                                                                         ):
                                    candidate = str(raw_stage_texts[stage_index]
                                                    or "").strip()
                                    if candidate:
                                        try:
                                            cand_tokens = shlex.split(candidate)
                                        except Exception:
                                            cand_tokens = candidate.split()
                                        if cand_tokens:
                                            first = str(cand_tokens[0]
                                                        ).replace("_",
                                                                  "-").lower()
                                            if first == cmd_name:
                                                stage_text = candidate
                                if not stage_text:
                                    stage_text = " ".join(stage_tokens).strip()
                                ctx.set_current_stage_text(stage_text)
                        except Exception:
                            pass

                        # `.pipe`/`.mpv` is typically the terminal interactive stage (MPV UI).
                        # Stop Live progress before running it so output doesn't get stuck behind Live.
                        if (cmd_name in {".pipe", ".mpv"} and progress_ui is not None
                                and (stage_index + 1 >= len(stages))):
                            try:
                                progress_ui.stop()
                            except Exception:
                                pass
                            try:
                                from SYS import pipeline as _pipeline_ctx

                                if hasattr(_pipeline_ctx, "set_live_progress"):
                                    _pipeline_ctx.set_live_progress(None)
                            except Exception:
                                pass
                            progress_ui = None

                        ret_code = cmd_fn(piped_result, list(stage_args), config)

                        stage_is_last = stage_index + 1 >= len(stages)

                        # Graceful early-stop: preflight declined, etc.
                        try:
                            stop_req = (
                                ctx.get_pipeline_stop()
                                if hasattr(ctx,
                                           "get_pipeline_stop") else None
                            )
                        except Exception:
                            stop_req = None
                        if stop_req is not None:
                            # Do not treat as an error; just end the pipeline quietly.
                            pipeline_status = "completed"
                            pipeline_error = ""
                            return

                        emits: List[Any] = []
                        if getattr(pipeline_ctx, "emits", None) is not None:
                            emits = list(pipeline_ctx.emits or [])

                            # Shared `-path` behavior: persist temp/PATH artifacts to destination.
                            if emits:
                                try:
                                    from cmdlet import _shared as sh

                                    emits = sh.apply_output_path_from_pipeobjects(
                                        cmd_name=cmd_name,
                                        args=list(stage_args),
                                        emits=emits,
                                    )
                                    try:
                                        pipeline_ctx.emits = list(emits)
                                    except Exception:
                                        pass
                                except Exception:
                                    pass
                            if emits:
                                # If the cmdlet already installed an overlay table (e.g. get-tag),
                                # don't overwrite it: set_last_result_items_only() would clear the
                                # overlay table/subject and break '@' subject piping.
                                try:
                                    has_overlay = (
                                        bool(ctx.get_display_table())
                                        if hasattr(ctx,
                                                   "get_display_table") else False
                                    )
                                except Exception:
                                    has_overlay = False
                                if not has_overlay:
                                    ctx.set_last_result_items_only(emits)
                                piped_result = emits
                            else:
                                piped_result = None

                        # Some cmdlets (notably download-file format selection) populate a selectable
                        # current-stage table without emitting pipeline items. In these cases, render
                        # the table and pause the pipeline so the user can pick @N.
                        stage_table = (
                            ctx.get_current_stage_table()
                            if hasattr(ctx,
                                       "get_current_stage_table") else None
                        )
                        stage_table_type = (
                            str(getattr(stage_table,
                                        "table",
                                        "") or "").strip().lower()
                            if stage_table else ""
                        )
                        try:
                            stage_table_source = (
                                str(getattr(stage_table,
                                            "source_command",
                                            "") or "").strip().replace("_",
                                                                       "-").lower()
                                if stage_table else ""
                            )
                        except Exception:
                            stage_table_source = ""
                        if ((not stage_is_last) and (not emits) and cmd_name in {
                            "download-file",
                            "download-data",
                            "download_data",
                        } and stage_table is not None
                            and (stage_table_type in {
                                "ytdlp.formatlist",
                                "download-file",
                                "bandcamp",
                                "youtube",
                            } or stage_table_source in {"download-file"}
                                 or stage_table_type in {"internetarchive.format", "internetarchive.formats"}
                                 or stage_table_source in {"download-file"})):
                            try:
                                is_selectable = not bool(
                                    getattr(stage_table,
                                            "no_choice",
                                            False)
                                )
                            except Exception:
                                is_selectable = True

                            if is_selectable:
                                try:
                                    already_rendered = bool(
                                        getattr(
                                            stage_table,
                                            "_rendered_by_cmdlet",
                                            False
                                        )
                                    )
                                except Exception:
                                    already_rendered = False

                                if not already_rendered:
                                    # Stop the Live progress display before printing a selectable table.
                                    # Printing while Live is active can cause the table to be truncated/overwritten.
                                    if progress_ui is not None:
                                        try:
                                            if pipe_idx is not None:
                                                progress_ui.finish_pipe(
                                                    int(pipe_idx),
                                                    force_complete=True
                                                )
                                        except Exception:
                                            pass
                                        try:
                                            progress_ui.stop()
                                        except Exception:
                                            pass
                                        try:
                                            from SYS import pipeline as _pipeline_ctx

                                            if hasattr(_pipeline_ctx,
                                                       "set_live_progress"):
                                                _pipeline_ctx.set_live_progress(None)
                                        except Exception:
                                            pass
                                        progress_ui = None
                                    stdout_console().print()
                                    stdout_console().print(stage_table)

                                # Always pause the pipeline when a selectable table was produced.
                                # The user will continue by running @N/@* which will re-attach the
                                # pending downstream stages.

                                try:
                                    remaining = stages[stage_index + 1:]
                                    source_cmd = (
                                        ctx.get_current_stage_table_source_command()
                                        if hasattr(
                                            ctx,
                                            "get_current_stage_table_source_command"
                                        ) else None
                                    )
                                    if remaining and hasattr(
                                            ctx,
                                            "set_pending_pipeline_tail"):
                                        ctx.set_pending_pipeline_tail(
                                            remaining,
                                            source_command=source_cmd or cmd_name
                                        )
                                except Exception:
                                    pass
                                return

                        # For the final stage, many cmdlets rely on the runner to render the
                        # table they placed into pipeline context (e.g. get-tag). Prefer a
                        # display table if one exists, otherwise the current-stage table.
                        if stage_is_last:
                            # Stop the Live progress display before printing the final table.
                            # This avoids cursor-control interactions that can truncate output.
                            if progress_ui is not None:
                                try:
                                    if pipe_idx is not None:
                                        progress_ui.finish_pipe(
                                            int(pipe_idx),
                                            force_complete=(
                                                stage_status == "completed"
                                            ),
                                        )
                                except Exception:
                                    pass
                                try:
                                    progress_ui.stop()
                                except Exception:
                                    pass
                                try:
                                    from SYS import pipeline as _pipeline_ctx

                                    if hasattr(_pipeline_ctx, "set_live_progress"):
                                        _pipeline_ctx.set_live_progress(None)
                                except Exception:
                                    pass
                                progress_ui = None

                            final_table = None
                            try:
                                final_table = (
                                    ctx.get_display_table()
                                    if hasattr(ctx,
                                               "get_display_table") else None
                                )
                            except Exception:
                                final_table = None
                            if final_table is None:
                                final_table = stage_table

                            # If the cmdlet emitted results but didn't supply a fresh table, it's
                            # common for `stage_table` to still point at the previous stage's table
                            # (e.g. add-file's canonical store table). In that case, prefer rendering
                            # the emitted results so the user sees the actual output of this stage.
                            if (emits and (ctx.get_display_table() if hasattr(
                                    ctx,
                                    "get_display_table") else None) is None):
                                try:
                                    src_cmd = (
                                        str(
                                            getattr(final_table,
                                                    "source_command",
                                                    "") or ""
                                        ).strip().lower() if final_table else ""
                                    )
                                except Exception:
                                    src_cmd = ""
                                try:
                                    cur_cmd = str(cmd_name
                                                  or "").strip().replace("_",
                                                                         "-").lower()
                                except Exception:
                                    cur_cmd = ""
                                if ((final_table is None) or (not src_cmd)
                                        or (src_cmd.replace("_",
                                                            "-") != cur_cmd)):
                                    try:
                                        table_title = CmdletExecutor._get_table_title_for_command(
                                            cmd_name,
                                            emits,
                                            list(stage_args)
                                        )
                                    except Exception:
                                        table_title = "Results"
                                    table = ResultTable(table_title)
                                    for item in emits:
                                        table.add_result(item)
                                    try:
                                        if hasattr(ctx,
                                                   "set_last_result_table_overlay"):
                                            ctx.set_last_result_table_overlay(
                                                table,
                                                emits
                                            )
                                        if hasattr(ctx, "set_current_stage_table"):
                                            ctx.set_current_stage_table(table)
                                    except Exception:
                                        pass
                                    final_table = table

                            if final_table is not None:
                                try:
                                    already_rendered = bool(
                                        getattr(
                                            final_table,
                                            "_rendered_by_cmdlet",
                                            False
                                        )
                                    )
                                except Exception:
                                    already_rendered = False

                                if not already_rendered:
                                    stdout_console().print()
                                    stdout_console().print(final_table)

                            # (Fallback handled above by synthesizing an overlay ResultTable.)

                        if isinstance(ret_code, int) and ret_code != 0:
                            stage_status = "failed"
                            stage_error = f"exit code {ret_code}"
                            print(f"[{stage_label} exit code: {ret_code}]\n")
                            pipeline_status = "failed"
                            pipeline_error = f"{stage_label} failed ({stage_error})"
                            return
                    except Exception as exc:
                        stage_status = "failed"
                        stage_error = f"{type(exc).__name__}: {exc}"
                        print(f"[error in {stage_label}]: {stage_error}\n")
                        pipeline_status = "failed"
                        pipeline_error = f"{stage_label} error: {exc}"
                        return
                    finally:
                        if pipeline_session and worker_manager:
                            status_label = (
                                "completed" if stage_status == "completed" else "failed"
                            )
                            msg = f"{stage_label} {status_label}"
                            if stage_error and stage_status != "completed":
                                msg += f": {stage_error}"
                            self._log_pipeline_event(
                                worker_manager,
                                pipeline_session.worker_id,
                                msg,
                            )
                        if progress_ui is not None and pipe_idx is not None:
                            try:
                                progress_ui.finish_pipe(
                                    int(pipe_idx),
                                    force_complete=(stage_status == "completed")
                                )
                            except Exception:
                                pass
                        try:
                            if hasattr(ctx, "clear_current_cmdlet_name"):
                                ctx.clear_current_cmdlet_name()
                        except Exception:
                            pass
                        try:
                            if hasattr(ctx, "clear_current_stage_text"):
                                ctx.clear_current_stage_text()
                        except Exception:
                            pass
                        if stage_session:
                            stage_session.close(
                                status=stage_status,
                                error_msg=stage_error
                            )
                        elif pipeline_session and worker_manager:
                            try:
                                worker_manager.log_step(
                                    pipeline_session.worker_id,
                                    f"{stage_label} {'completed' if stage_status == 'completed' else 'failed'}",
                                )
                            except Exception:
                                pass

                if not stages and piped_result is not None:
                    # Special-case: selecting metadata rows (e.g., get-tag -scrape) should
                    # immediately apply tags to the target item instead of just echoing a
                    # selection table.
                    try:
                        items = piped_result if isinstance(piped_result, list) else [piped_result]
                        applied_any = False
                        from cmdlet._shared import normalize_hash  # type: ignore
                        from cmdlet.get_tag import _filter_scraped_tags, _emit_tags_as_table  # type: ignore
                        from Store import Store  # type: ignore
                        cfg_loader = ConfigLoader(root=Path.cwd())
                        config = cfg_loader.load()

                        for item in items:
                            if not isinstance(item, dict):
                                continue
                            provider = item.get("provider")
                            tags = item.get("tag")
                            if not provider or not isinstance(tags, list) or not tags:
                                continue

                            file_hash = normalize_hash(
                                item.get("hash")
                                or item.get("hash_hex")
                                or item.get("file_hash")
                                or item.get("sha256")
                            )
                            store_name = item.get("store") or item.get("storage")
                            subject_path = (
                                item.get("path")
                                or item.get("target")
                                or item.get("filename")
                            )

                            if str(provider).strip().lower() == "ytdlp":
                                apply_tags = [str(t) for t in tags if t is not None]
                            else:
                                apply_tags = _filter_scraped_tags([str(t) for t in tags if t is not None])

                            if not apply_tags:
                                continue

                            if store_name and file_hash:
                                try:
                                    backend = Store(config)[str(store_name)]
                                    backend.add_tag(file_hash, apply_tags, config=config)
                                    try:
                                        updated_tags, _src = backend.get_tag(file_hash, config=config)
                                    except Exception:
                                        updated_tags = apply_tags
                                    _emit_tags_as_table(
                                        tags_list=list(updated_tags or apply_tags),
                                        file_hash=file_hash,
                                        store=str(store_name),
                                        service_name=None,
                                        config=config,
                                        item_title=str(item.get("title") or provider),
                                        path=str(subject_path) if subject_path else None,
                                        subject=item,
                                    )
                                    applied_any = True
                                    continue
                                except Exception:
                                    pass

                            # No store/hash: just emit the tags to the pipeline/view.
                            _emit_tags_as_table(
                                tags_list=list(apply_tags),
                                file_hash=file_hash,
                                store=str(store_name or "local"),
                                service_name=None,
                                config=config,
                                item_title=str(item.get("title") or provider),
                                path=str(subject_path) if subject_path else None,
                                subject=item,
                            )
                            applied_any = True

                        if applied_any:
                            # Selection handled; skip default selection echo.
                            return
                    except Exception:
                        # Fall back to default selection rendering on any failure.
                        pass

                    items = piped_result if isinstance(piped_result, list) else [piped_result]

                    # Special-case: selecting notes should show the text content directly.
                    note_like_items = [
                        i for i in items
                        if isinstance(i, dict) and ("note_text" in i or "note" in i)
                    ]
                    if note_like_items:
                        for idx, item in enumerate(note_like_items, 1):
                            note_name = str(
                                item.get("note_name")
                                or item.get("name")
                                or f"note {idx}"
                            ).strip()
                            note_text = str(item.get("note_text") or item.get("note") or "")
                            note_text = note_text[:999]
                            stdout_console().print()
                            stdout_console().print(f"{note_name}:\n{note_text}")
                        ctx.set_last_result_items_only(items)
                        return

                    # Special-case: selecting a single image should show it directly.
                    if len(items) == 1:
                        item = items[0]
                        
                        # Try to get hash and store to resolve through the backend
                        file_hash = None
                        store_name = None
                        if isinstance(item, dict):
                            file_hash = item.get("hash")
                            store_name = item.get("store")
                        else:
                            if hasattr(item, "hash"):
                                file_hash = getattr(item, "hash", None)
                            if hasattr(item, "store"):
                                store_name = getattr(item, "store", None)
                        
                        # Try to resolve the file through the Store backend if we have hash + store
                        resolved_file_path = None
                        if file_hash and store_name:
                            try:
                                from Store import Store
                                storage = Store(config=config or {})
                                backend = storage[str(store_name)]
                                
                                # Call get_file to resolve the hash to an actual file path
                                maybe_path = backend.get_file(str(file_hash))
                                
                                if isinstance(maybe_path, Path):
                                    resolved_file_path = maybe_path
                                elif isinstance(maybe_path, str) and maybe_path:
                                    # Only treat as a Path if it doesn't look like a URL
                                    if not maybe_path.startswith(("http://", "https://")):
                                        resolved_file_path = Path(maybe_path)
                            except Exception:
                                # Fallback: try using the path field from the item
                                pass
                        
                        # If backend resolution failed, try the path field
                        if not resolved_file_path:
                            path_str = None
                            if isinstance(item, dict):
                                path_str = (
                                    item.get("path")
                                    or item.get("PATH")
                                    or item.get("target")
                                    or item.get("filename")
                                )
                            else:
                                # Try attributes for PipeObject/SearchResult/etc.
                                for attr in ("path", "PATH", "target", "filename"):
                                    if hasattr(item, attr):
                                        val = getattr(item, attr)
                                        if val and isinstance(val, (str, Path)):
                                            path_str = val
                                            break
                            
                            if path_str:
                                from SYS.utils import expand_path
                                resolved_file_path = expand_path(path_str).resolve()
                        
                        # Now check if it's an image and render it
                        is_image = False
                        if resolved_file_path:
                            try:
                                if resolved_file_path.suffix.lower() in IMAGE_EXTENSIONS and resolved_file_path.exists():
                                    # Use our image renderer
                                    stdout_console().print()
                                    render_image_to_console(resolved_file_path)
                                    is_image = True
                                elif resolved_file_path.suffix.lower() in IMAGE_EXTENSIONS and not resolved_file_path.exists():
                                    stdout_console().print(f"[yellow]Warning: Image file not found at {resolved_file_path}[/yellow]")
                            except Exception:
                                pass
                        
                        # Render the comprehensive details panel for the item in either case
                        item_to_details = item if isinstance(item, dict) else (
                            item.to_dict() if hasattr(item, "to_dict") else vars(item)
                        )
                        # Ensure we include the resolved path if we found one
                        if resolved_file_path and "path" not in item_to_details:
                            item_to_details["path"] = str(resolved_file_path)

                        render_item_details_panel(item_to_details)

                        ctx.set_last_result_items_only(items)
                        return

                    table = ResultTable("Selection Result")
                    for item in items:
                        table.add_result(item)
                    ctx.set_last_result_items_only(items)
                    stdout_console().print()
                    stdout_console().print(table)
            except Exception as exc:
                pipeline_status = "failed"
                pipeline_error = str(exc)
                print(f"[error] Failed to execute pipeline: {exc}\n")
            finally:
                if progress_ui is not None:
                    try:
                        progress_ui.stop()
                    except Exception:
                        pass
                try:
                    from SYS import pipeline as _pipeline_ctx

                    if hasattr(_pipeline_ctx, "set_live_progress"):
                        _pipeline_ctx.set_live_progress(None)
                except Exception:
                    pass
                # End-of-command cleanup: avoid leaking current stage tables into
                # the next REPL command (causes stale @ selection sources).
                try:
                    if hasattr(ctx, "set_current_stage_table"):
                        ctx.set_current_stage_table(None)
                except Exception:
                    pass
                if pipeline_session and worker_manager:
                    final_msg = f"Pipeline {pipeline_status}"
                    if pipeline_error:
                        final_msg += f": {pipeline_error}"
                    else:
                        final_msg += " (ok)"
                    self._log_pipeline_event(
                        worker_manager,
                        pipeline_session.worker_id,
                        final_msg,
                    )
                if pipeline_session:
                    pipeline_session.close(
                        status=pipeline_status,
                        error_msg=pipeline_error
                    )
        except Exception as exc:
            print(f"[error] Failed to execute pipeline: {exc}\n")


from rich.markdown import Markdown
from rich.console import Console

console = Console()


class MedeiaCLI:
    """Main CLI application object."""

    ROOT = Path(__file__).resolve().parent

    def __init__(self) -> None:
        self._config_loader = ConfigLoader(root=self.ROOT)

        # Optional dependency auto-install for configured tools (best-effort).
        try:
            from SYS.optional_deps import maybe_auto_install_configured_tools

            maybe_auto_install_configured_tools(self._config_loader.load())
        except Exception:
            pass

        # Initialize the store choices cache at startup (filters disabled stores)
        try:
            from cmdlet._shared import SharedArgs
            config = self._config_loader.load()
            SharedArgs._refresh_store_choices_cache(config)
        except Exception:
            pass

        self._cmdlet_executor = CmdletExecutor(config_loader=self._config_loader)
        self._pipeline_executor = PipelineExecutor(config_loader=self._config_loader)

    @staticmethod
    def parse_selection_syntax(token: str) -> Optional[Set[int]]:
        return SelectionSyntax.parse(token)

    @classmethod
    def get_store_choices(cls) -> List[str]:
        loader = ConfigLoader(root=cls.ROOT)
        return CmdletIntrospection.store_choices(loader.load())

    def build_app(self) -> typer.Typer:
        app = typer.Typer(help="Medeia-Macina CLI")

        def _validate_pipeline_option(
            ctx: typer.Context,
            param: typer.CallbackParam,
            value: str
        ):
            try:
                from SYS.cli_syntax import validate_pipeline_text

                syntax_error = validate_pipeline_text(value)
                if syntax_error:
                    raise typer.BadParameter(syntax_error.message)
            except typer.BadParameter:
                raise
            except Exception:
                pass
            return value

        @app.command("pipeline")
        def pipeline(
            command: str = typer.Option(
                ...,
                "--pipeline",
                "-p",
                help="Pipeline command string to execute",
                callback=_validate_pipeline_option,
            ),
            seeds_json: Optional[str] = typer.Option(
                None,
                "--seeds-json",
                "-s",
                help="JSON string of seed items"
            ),
        ) -> None:
            from SYS import pipeline as ctx

            config = self._config_loader.load()
            debug_enabled = bool(config.get("debug", False))
            set_debug(debug_enabled)

            if seeds_json:
                try:
                    seeds = json.loads(seeds_json)
                    if not isinstance(seeds, list):
                        seeds = [seeds]
                    ctx.set_last_result_items_only(seeds)
                except Exception as exc:
                    print(f"Error parsing seeds JSON: {exc}")
                    return

            try:
                from SYS.cli_syntax import validate_pipeline_text

                syntax_error = validate_pipeline_text(command)
                if syntax_error:
                    print(syntax_error.message, file=sys.stderr)
                    return
            except Exception:
                pass

            try:
                tokens = shlex.split(command)
            except ValueError as exc:
                print(f"Syntax error: {exc}", file=sys.stderr)
                return

            if not tokens:
                return
            self._pipeline_executor.execute_tokens(tokens)

        @app.command("repl")
        def repl() -> None:
            self.run_repl()

        @app.callback(invoke_without_command=True)
        def main_callback(ctx: typer.Context) -> None:
            if ctx.invoked_subcommand is None:
                self.run_repl()

        _ = (pipeline, repl, main_callback)

        # Dynamically register all cmdlets as top-level Typer commands so users can
        # invoke `mm <cmdlet> [args]` directly from the shell. We use Click/Typer
        # context settings to allow arbitrary flags and options to pass through to
        # the cmdlet system without Typer trying to parse them.
        try:
            names = list_cmdlet_names()
            skip = {"pipeline", "repl"}
            for nm in names:
                if not nm or nm in skip:
                    continue

                # create a scoped handler to capture the command name
                def _make_handler(cmd_name: str):

                    @app.command(
                        cmd_name,
                        context_settings={
                            "ignore_unknown_options": True,
                            "allow_extra_args": True,
                        },
                    )
                    def _handler(ctx: typer.Context):
                        try:
                            args = list(ctx.args or [])
                        except Exception:
                            args = []
                        self._cmdlet_executor.execute(cmd_name, args)

                    return _handler

                _make_handler(nm)
        except Exception:
            # Don't let failure to register dynamic commands break startup
            pass

        return app

    def run(self) -> None:
        # Ensure Rich tracebacks are active even when invoking subcommands.
        try:
            config = self._config_loader.load()
            debug_enabled = bool(config.get("debug",
                                            False)
                                 ) if isinstance(config,
                                                 dict) else False
        except Exception:
            debug_enabled = False

        set_debug(debug_enabled)
        _install_rich_traceback(show_locals=debug_enabled)

        self.build_app()()

    def run_repl(self) -> None:
        # console = Console(width=100)

        # Valid Rich rainbow colors
        RAINBOW = [
            "red",
            "dark_orange",
            "yellow",
            "green",
            "blue",
            "purple",
            "magenta",
        ]

        def rainbow_pillar(colors, height=21, bar_width=36):
            table = Table.grid(padding=0)
            table.add_column(no_wrap=True)

            for i in range(height):
                color = colors[i % len(colors)]
                table.add_row(Bar(size=1, begin=0, end=1, width=bar_width, color=color))

            return table

        # Build root layout
        root = Layout(name="root")
        root.split_row(
            Layout(name="left",
                   ratio=2),
            Layout(name="center",
                   ratio=8),
            Layout(name="right",
                   ratio=2),
        )

        # Left pillar → forward rainbow
        root["left"].update(
            Panel(rainbow_pillar(RAINBOW,
                                 height=21,
                                 bar_width=36),
                  title="DELTA")
        )

        # Right pillar → reverse rainbow
        root["right"].update(
            Panel(
                rainbow_pillar(list(reversed(RAINBOW)),
                               height=21,
                               bar_width=36),
                title="LAMBDA"
            )
        )

        # Center content
        center_md = Markdown(
            """
# ******************    Medios Macina    ******************
take what you want | keep what you like | share what you love
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
For suddenly you may be let loose from the net, and thrown out to sea.
Waving around clutching at gnats, unable to lift the heavy anchor. Lost
and without a map, forgotten things from the past by distracting wind storms.
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________
Light shines a straight path to the golden shores.
Come to love it when others take what you share, as there is no greater joy
"""
        )
        root["center"].update(Panel(center_md, title="KAPPA", height=21))

        console.print(root)

        prompt_text = "<🜂🜄|🜁🜃>"

        startup_table = ResultTable(
            "*********<IGNITIO>*********<NOUSEMPEH>*********<RUGRAPOG>*********<OMEGHAU>*********"
        )
        startup_table.set_no_choice(True).set_preserve_order(True)
        startup_table.set_value_case("upper")

        def _upper(value: Any) -> str:
            text = "" if value is None else str(value)
            return text.upper()

        def _add_startup_check(
            status: str,
            name: str,
            *,
            provider: str = "",
            store: str = "",
            files: int | str | None = None,
            detail: str = "",
        ) -> None:
            row = startup_table.add_row()
            row.add_column("STATUS", _upper(status))
            row.add_column("NAME", _upper(name))
            row.add_column("PROVIDER", _upper(provider or ""))
            row.add_column("STORE", _upper(store or ""))
            row.add_column("FILES", "" if files is None else str(files))
            row.add_column("DETAIL", _upper(detail or ""))

        def _has_store_subtype(cfg: dict, subtype: str) -> bool:
            store_cfg = cfg.get("store")
            if not isinstance(store_cfg, dict):
                return False
            bucket = store_cfg.get(subtype)
            if not isinstance(bucket, dict):
                return False
            return any(isinstance(v, dict) and bool(v) for v in bucket.values())

        def _has_provider(cfg: dict, name: str) -> bool:
            provider_cfg = cfg.get("provider")
            if not isinstance(provider_cfg, dict):
                return False
            block = provider_cfg.get(str(name).strip().lower())
            return isinstance(block, dict) and bool(block)

        def _has_tool(cfg: dict, name: str) -> bool:
            tool_cfg = cfg.get("tool")
            if not isinstance(tool_cfg, dict):
                return False
            block = tool_cfg.get(str(name).strip().lower())
            return isinstance(block, dict) and bool(block)

        def _ping_url(url: str, timeout: float = 3.0) -> tuple[bool, str]:
            try:
                from API.HTTP import HTTPClient

                with HTTPClient(timeout=timeout, retries=1) as client:
                    resp = client.get(url, allow_redirects=True)
                code = int(getattr(resp, "status_code", 0) or 0)
                ok = 200 <= code < 500
                return ok, f"{url} (HTTP {code})"
            except Exception as exc:
                return False, f"{url} ({type(exc).__name__})"

        config = self._config_loader.load()
        debug_enabled = bool(config.get("debug", False))
        set_debug(debug_enabled)
        _install_rich_traceback(show_locals=debug_enabled)
        _add_startup_check("ENABLED" if debug_enabled else "DISABLED", "DEBUGGING")

        try:
            try:
                from MPV.mpv_ipc import MPV
                import shutil

                MPV()
                mpv_path = shutil.which("mpv")
                _add_startup_check("ENABLED", "MPV", detail=mpv_path or "Available")
            except Exception as exc:
                _add_startup_check("DISABLED", "MPV", detail=str(exc))

            store_registry = None
            if config:
                try:
                    from Store import Store as StoreRegistry

                    store_registry = StoreRegistry(config=config, suppress_debug=True)
                except Exception:
                    store_registry = None

                if _has_store_subtype(config, "hydrusnetwork"):
                    store_cfg = config.get("store")
                    hydrus_cfg = (
                        store_cfg.get("hydrusnetwork",
                                      {}) if isinstance(store_cfg,
                                                        dict) else {}
                    )
                    if isinstance(hydrus_cfg, dict):
                        for instance_name, instance_cfg in hydrus_cfg.items():
                            if not isinstance(instance_cfg, dict):
                                continue
                            name_key = str(instance_cfg.get("NAME") or instance_name)
                            url_val = str(instance_cfg.get("URL") or "").strip()

                            ok = bool(
                                store_registry
                                and store_registry.is_available(name_key)
                            )
                            status = "ENABLED" if ok else "DISABLED"
                            if ok:
                                total = None
                                try:
                                    if store_registry:
                                        backend = store_registry[name_key]
                                        total = getattr(backend, "total_count", None)
                                        if total is None:
                                            getter = getattr(
                                                backend,
                                                "get_total_count",
                                                None
                                            )
                                            if callable(getter):
                                                total = getter()
                                except Exception:
                                    total = None
                                detail = url_val
                                files = total if isinstance(
                                    total,
                                    int
                                ) and total >= 0 else None
                            else:
                                err = None
                                if store_registry:
                                    err = store_registry.get_backend_error(
                                        instance_name
                                    ) or store_registry.get_backend_error(name_key)
                                detail = (url_val + (" - " if url_val else "")
                                          ) + (err or "Unavailable")
                                files = None
                            _add_startup_check(
                                status,
                                name_key,
                                store="hydrusnetwork",
                                files=files,
                                detail=detail
                            )

                provider_cfg = config.get("provider"
                                          ) if isinstance(config,
                                                          dict) else None
                if isinstance(provider_cfg, dict) and provider_cfg:
                    from Provider.metadata_provider import list_metadata_providers
                    from ProviderCore.registry import (
                        list_file_providers,
                        list_providers,
                        list_search_providers,
                    )

                    provider_availability = list_providers(config) or {}
                    search_availability = list_search_providers(config) or {}
                    file_availability = list_file_providers(config) or {}
                    meta_availability = list_metadata_providers(config) or {}

                    def _provider_display_name(key: str) -> str:
                        k = (key or "").strip()
                        low = k.lower()
                        if low == "openlibrary":
                            return "OpenLibrary"
                        if low == "alldebrid":
                            return "AllDebrid"
                        if low == "youtube":
                            return "YouTube"
                        return k[:1].upper() + k[1:] if k else "Provider"

                    already_checked = {"matrix"}

                    def _default_provider_ping_targets(provider_key: str) -> list[str]:
                        prov = (provider_key or "").strip().lower()
                        if prov == "openlibrary":
                            return ["https://openlibrary.org"]
                        if prov == "youtube":
                            return ["https://www.youtube.com"]
                        if prov == "bandcamp":
                            return ["https://bandcamp.com"]
                        if prov == "libgen":
                            from Provider.libgen import MIRRORS

                            mirrors = [
                                str(x).rstrip("/") for x in (MIRRORS or [])
                                if str(x).strip()
                            ]
                            return [m + "/json.php" for m in mirrors]
                        return []

                    def _ping_first(urls: list[str]) -> tuple[bool, str]:
                        for u in urls:
                            ok, detail = _ping_url(u)
                            if ok:
                                return True, detail
                        if urls:
                            ok, detail = _ping_url(urls[0])
                            return ok, detail
                        return False, "No ping target"

                    for provider_name in provider_cfg.keys():
                        prov = str(provider_name or "").strip().lower()
                        if not prov or prov in already_checked:
                            continue
                        display = _provider_display_name(prov)

                        if prov == "alldebrid":
                            try:
                                from Provider.alldebrid import _get_debrid_api_key
                                from API.alldebrid import AllDebridClient

                                api_key = _get_debrid_api_key(config)
                                if not api_key:
                                    _add_startup_check(
                                        "DISABLED",
                                        display,
                                        provider=prov,
                                        detail="Not configured"
                                    )
                                else:
                                    client = AllDebridClient(api_key)
                                    base_url = str(
                                        getattr(client,
                                                "base_url",
                                                "") or ""
                                    ).strip()
                                    _add_startup_check(
                                        "ENABLED",
                                        display,
                                        provider=prov,
                                        detail=base_url or "Connected",
                                    )
                            except Exception as exc:
                                _add_startup_check(
                                    "DISABLED",
                                    display,
                                    provider=prov,
                                    detail=str(exc)
                                )
                            continue

                        is_known = False
                        ok_val: Optional[bool] = None
                        if prov in provider_availability:
                            is_known = True
                            ok_val = bool(provider_availability.get(prov))
                        elif prov in search_availability:
                            is_known = True
                            ok_val = bool(search_availability.get(prov))
                        elif prov in file_availability:
                            is_known = True
                            ok_val = bool(file_availability.get(prov))
                        elif prov in meta_availability:
                            is_known = True
                            ok_val = bool(meta_availability.get(prov))

                        if not is_known:
                            _add_startup_check(
                                "UNKNOWN",
                                display,
                                provider=prov,
                                detail="Not registered"
                            )
                        else:
                            detail = "Configured" if ok_val else "Not configured"
                            ping_targets = _default_provider_ping_targets(prov)
                            if ping_targets:
                                ping_ok, ping_detail = _ping_first(ping_targets)
                                if ok_val:
                                    detail = ping_detail
                                else:
                                    detail = (
                                        (detail + " | " +
                                         ping_detail) if ping_detail else detail
                                    )
                            _add_startup_check(
                                "ENABLED" if ok_val else "DISABLED",
                                display,
                                provider=prov,
                                detail=detail,
                            )

                        already_checked.add(prov)

                    default_search_providers = [
                        "openlibrary",
                        "libgen",
                        "youtube",
                        "bandcamp"
                    ]
                    for prov in default_search_providers:
                        if prov in already_checked:
                            continue
                        display = _provider_display_name(prov)
                        ok_val = (
                            bool(search_availability.get(prov))
                            if prov in search_availability else False
                        )
                        ping_targets = _default_provider_ping_targets(prov)
                        ping_ok, ping_detail = (
                            _ping_first(ping_targets) if ping_targets else (False, "No ping target")
                        )
                        detail = ping_detail or (
                            "Available" if ok_val else "Unavailable"
                        )
                        if not ok_val:
                            detail = "Unavailable" + (
                                f" | {ping_detail}" if ping_detail else ""
                            )
                        _add_startup_check(
                            "ENABLED" if (ok_val and ping_ok) else "DISABLED",
                            display,
                            provider=prov,
                            detail=detail,
                        )
                        already_checked.add(prov)

                    if "0x0" not in already_checked:
                        ok_val = (
                            bool(file_availability.get("0x0"))
                            if "0x0" in file_availability else False
                        )
                        ping_ok, ping_detail = _ping_url("https://0x0.st")
                        detail = ping_detail
                        if not ok_val:
                            detail = "Unavailable" + (
                                f" | {ping_detail}" if ping_detail else ""
                            )
                        _add_startup_check(
                            "ENABLED" if (ok_val and ping_ok) else "DISABLED",
                            "0x0",
                            provider="0x0",
                            detail=detail,
                        )

                if _has_provider(config, "matrix"):
                    try:
                        from Provider.matrix import Matrix

                        provider = Matrix(config)
                        matrix_conf = (
                            config.get("provider",
                                       {}).get("matrix",
                                               {}) if isinstance(config,
                                                                 dict) else {}
                        )
                        homeserver = str(matrix_conf.get("homeserver") or "").strip()
                        room_id = str(matrix_conf.get("room_id") or "").strip()
                        if homeserver and not homeserver.startswith("http"):
                            homeserver = f"https://{homeserver}"
                        target = homeserver.rstrip("/")
                        if room_id:
                            target = (
                                target + (" " if target else "")
                            ) + f"room:{room_id}"
                        _add_startup_check(
                            "ENABLED" if provider.validate() else "DISABLED",
                            "Matrix",
                            provider="matrix",
                            detail=target or
                            ("Connected" if provider.validate() else "Not configured"),
                        )
                    except Exception as exc:
                        _add_startup_check(
                            "DISABLED",
                            "Matrix",
                            provider="matrix",
                            detail=str(exc)
                        )

                if _has_store_subtype(config, "folder"):
                    store_cfg = config.get("store")
                    folder_cfg = store_cfg.get("folder",
                                               {}) if isinstance(store_cfg,
                                                                 dict) else {}
                    if isinstance(folder_cfg, dict) and folder_cfg:
                        for instance_name, instance_cfg in folder_cfg.items():
                            if not isinstance(instance_cfg, dict):
                                continue
                            name_key = str(instance_cfg.get("NAME") or instance_name)
                            path_val = str(
                                instance_cfg.get("PATH") or instance_cfg.get("path")
                                or ""
                            ).strip()

                            ok = bool(
                                store_registry
                                and store_registry.is_available(name_key)
                            )
                            if ok and store_registry:
                                backend = store_registry[name_key]
                                scan_ok = bool(getattr(backend, "scan_ok", True))
                                scan_detail = str(
                                    getattr(backend,
                                            "scan_detail",
                                            "") or ""
                                )
                                stats = getattr(backend, "scan_stats", None)
                                files = None
                                if isinstance(stats, dict):
                                    total_db = stats.get("files_total_db")
                                    if isinstance(total_db, (int, float)):
                                        files = int(total_db)
                                status = "SCANNED" if scan_ok else "ERROR"
                                detail = (path_val + (" - " if path_val else "")
                                          ) + (scan_detail or "Up to date")
                                _add_startup_check(
                                    status,
                                    name_key,
                                    store="folder",
                                    files=files,
                                    detail=detail
                                )
                            else:
                                err = None
                                if store_registry:
                                    err = store_registry.get_backend_error(
                                        instance_name
                                    ) or store_registry.get_backend_error(name_key)
                                detail = (path_val + (" - " if path_val else "")
                                          ) + (err or "Unavailable")
                                _add_startup_check(
                                    "ERROR",
                                    name_key,
                                    store="folder",
                                    detail=detail
                                )

                if _has_store_subtype(config, "debrid"):
                    try:
                        from SYS.config import get_debrid_api_key
                        from API.alldebrid import AllDebridClient

                        api_key = get_debrid_api_key(config)
                        if not api_key:
                            _add_startup_check(
                                "DISABLED",
                                "Debrid",
                                store="debrid",
                                detail="Not configured"
                            )
                        else:
                            client = AllDebridClient(api_key)
                            base_url = str(getattr(client,
                                                   "base_url",
                                                   "") or "").strip()
                            _add_startup_check(
                                "ENABLED",
                                "Debrid",
                                store="debrid",
                                detail=base_url or "Connected"
                            )
                    except Exception as exc:
                        _add_startup_check(
                            "DISABLED",
                            "Debrid",
                            store="debrid",
                            detail=str(exc)
                        )

            try:
                from tool.ytdlp import YtDlpTool

                cookiefile = YtDlpTool(config).resolve_cookiefile()
                if cookiefile is not None:
                    _add_startup_check("FOUND", "Cookies", detail=str(cookiefile))
                else:
                    _add_startup_check("MISSING", "Cookies", detail="Not found")
            except Exception as exc:
                _add_startup_check("ERROR", "Cookies", detail=str(exc))

            # Tool checks (configured via [tool=...])
            if _has_tool(config, "florencevision"):
                try:
                    tool_cfg = config.get("tool")
                    fv_cfg = tool_cfg.get("florencevision") if isinstance(tool_cfg, dict) else None
                    enabled = bool(fv_cfg.get("enabled")) if isinstance(fv_cfg, dict) else False
                    if not enabled:
                        _add_startup_check(
                            "DISABLED",
                            "FlorenceVision",
                            provider="tool",
                            detail="Not enabled",
                        )
                    else:
                        from SYS.optional_deps import florencevision_missing_modules

                        missing = florencevision_missing_modules()
                        if missing:
                            _add_startup_check(
                                "DISABLED",
                                "FlorenceVision",
                                provider="tool",
                                detail="Missing: " + ", ".join(missing),
                            )
                        else:
                            _add_startup_check(
                                "ENABLED",
                                "FlorenceVision",
                                provider="tool",
                                detail="Ready",
                            )
                except Exception as exc:
                    _add_startup_check(
                        "DISABLED",
                        "FlorenceVision",
                        provider="tool",
                        detail=str(exc),
                    )

            if startup_table.rows:
                stdout_console().print()
                stdout_console().print(startup_table)
        except Exception as exc:
            if debug_enabled:
                debug(f"⚠ Could not check service availability: {exc}")

        style = Style.from_dict(
            {
                "cmdlet": "#ffffff",
                "argument": "#3b8eea",
                "value": "#9a3209",
                "string": "#6d0d93",
                "pipe": "#4caf50",
                "selection_at": "#f1c40f",
                "selection_range": "#4caf50",
                "bottom-toolbar": "noreverse",
            }
        )

        class ToolbarState:
            text: str = ""
            last_update_time: float = 0.0
            clear_timer: Optional[threading.Timer] = None

        toolbar_state = ToolbarState()
        session: Optional[PromptSession] = None

        def get_toolbar() -> Optional[str]:
            if not toolbar_state.text or not toolbar_state.text.strip():
                return None
            if time.time() - toolbar_state.last_update_time > 3:
                toolbar_state.text = ""
                return None
            return toolbar_state.text

        def update_toolbar(text: str) -> None:
            nonlocal session
            text = text.strip()
            toolbar_state.text = text
            toolbar_state.last_update_time = time.time()

            if toolbar_state.clear_timer:
                toolbar_state.clear_timer.cancel()
                toolbar_state.clear_timer = None

            if text:

                def clear_toolbar() -> None:
                    toolbar_state.text = ""
                    toolbar_state.clear_timer = None
                    if session is not None and hasattr(
                            session,
                            "app") and session.app.is_running:
                        session.app.invalidate()

                toolbar_state.clear_timer = threading.Timer(3.0, clear_toolbar)
                toolbar_state.clear_timer.daemon = True
                toolbar_state.clear_timer.start()

            if session is not None and hasattr(session,
                                               "app") and session.app.is_running:
                session.app.invalidate()

        self._pipeline_executor.set_toolbar_output(update_toolbar)

        completer = CmdletCompleter(config_loader=self._config_loader)
        session = PromptSession(
            completer=cast(Any,
                           completer),
            lexer=MedeiaLexer(),
            style=style,
            bottom_toolbar=get_toolbar,
            refresh_interval=0.5,
        )

        while True:
            try:
                user_input = session.prompt(prompt_text).strip()
            except (EOFError, KeyboardInterrupt):
                print("He who is victorious through deceit is defeated by the truth.")
                break

            if not user_input:
                continue

            low = user_input.lower()
            if low in {"exit",
                       "quit",
                       "q"}:
                print("He who is victorious through deceit is defeated by the truth.")
                break
            if low in {"help",
                       "?"}:
                CmdletHelp.show_cmdlet_list()
                continue

            pipeline_ctx_ref = None
            try:
                from SYS import pipeline as ctx

                ctx.set_current_command_text(user_input)
                pipeline_ctx_ref = ctx
            except Exception:
                pipeline_ctx_ref = None

            try:
                from SYS.cli_syntax import validate_pipeline_text

                syntax_error = validate_pipeline_text(user_input)
                if syntax_error:
                    print(syntax_error.message, file=sys.stderr)
                    continue
            except Exception:
                pass

            try:
                tokens = shlex.split(user_input)
            except ValueError as exc:
                print(f"Syntax error: {exc}", file=sys.stderr)
                continue

            if not tokens:
                continue

            if len(tokens) == 1 and tokens[0] == "@,,":
                try:
                    from SYS import pipeline as ctx

                    if ctx.restore_next_result_table():
                        last_table = (
                            ctx.get_display_table()
                            if hasattr(ctx,
                                       "get_display_table") else None
                        )
                        if last_table is None:
                            last_table = ctx.get_last_result_table()
                        if last_table:
                            stdout_console().print()
                            ctx.set_current_stage_table(last_table)
                            stdout_console().print(last_table)
                        else:
                            items = ctx.get_last_result_items()
                            if items:
                                ctx.set_current_stage_table(None)
                                print(
                                    f"Restored {len(items)} items (no table format available)"
                                )
                    else:
                        print("No forward history available", file=sys.stderr)
                except Exception as exc:
                    print(f"Error restoring next table: {exc}", file=sys.stderr)
                continue

            if len(tokens) == 1 and tokens[0] == "@..":
                try:
                    from SYS import pipeline as ctx

                    if ctx.restore_previous_result_table():
                        last_table = (
                            ctx.get_display_table()
                            if hasattr(ctx,
                                       "get_display_table") else None
                        )
                        if last_table is None:
                            last_table = ctx.get_last_result_table()

                        # Auto-refresh search-file tables when navigating back,
                        # so row payloads (titles/tags) reflect latest store state.
                        try:
                            src_cmd = (
                                getattr(last_table,
                                        "source_command",
                                        None) if last_table else None
                            )
                            if (isinstance(src_cmd,
                                           str)
                                    and src_cmd.lower().replace("_",
                                                                "-") == "search-file"):
                                src_args = (
                                    getattr(last_table,
                                            "source_args",
                                            None) if last_table else None
                                )
                                base_args = list(src_args
                                                 ) if isinstance(src_args,
                                                                 list) else []
                                cleaned_args = [
                                    str(a) for a in base_args if str(a).strip().lower()
                                    not in {"--refresh", "-refresh"}
                                ]
                                if hasattr(ctx, "set_current_command_text"):
                                    try:
                                        title_text = (
                                            getattr(last_table,
                                                    "title",
                                                    None) if last_table else None
                                        )
                                        if isinstance(title_text,
                                                      str) and title_text.strip():
                                            ctx.set_current_command_text(
                                                title_text.strip()
                                            )
                                        else:
                                            ctx.set_current_command_text(
                                                " ".join(
                                                    ["search-file",
                                                     *cleaned_args]
                                                ).strip()
                                            )
                                    except Exception:
                                        pass
                                try:
                                    self._cmdlet_executor.execute(
                                        "search-file",
                                        cleaned_args + ["--refresh"]
                                    )
                                finally:
                                    if hasattr(ctx, "clear_current_command_text"):
                                        try:
                                            ctx.clear_current_command_text()
                                        except Exception:
                                            pass
                                continue
                        except Exception as exc:
                            print(
                                f"Error refreshing search-file table: {exc}",
                                file=sys.stderr
                            )

                        if last_table:
                            stdout_console().print()
                            ctx.set_current_stage_table(last_table)
                            stdout_console().print(last_table)
                        else:
                            items = ctx.get_last_result_items()
                            if items:
                                ctx.set_current_stage_table(None)
                                print(
                                    f"Restored {len(items)} items (no table format available)"
                                )
                            else:
                                print("No previous result table in history")
                    else:
                        print("Result table history is empty")
                except Exception as exc:
                    print(f"Error restoring previous result table: {exc}")
                continue

            try:
                if "|" in tokens or (tokens and tokens[0].startswith("@")):
                    self._pipeline_executor.execute_tokens(tokens)
                else:
                    cmd_name = tokens[0].replace("_", "-").lower()
                    is_help = any(
                        arg in {"-help",
                                "--help",
                                "-h"} for arg in tokens[1:]
                    )
                    if is_help:
                        CmdletHelp.show_cmdlet_help(cmd_name)
                    else:
                        self._cmdlet_executor.execute(cmd_name, tokens[1:])
            finally:
                if pipeline_ctx_ref:
                    pipeline_ctx_ref.clear_current_command_text()


if __name__ == "__main__":
    MedeiaCLI().run()