"""Data models for the pipeline."""

import datetime
import hashlib
import json
import os
import shutil
import sys
import time
from dataclasses import dataclass, field
from pathlib import Path
from typing import Any, Callable, Dict, List, Optional, Protocol, TextIO

from rich.console import Console
from rich.progress import (
    BarColumn,
    DownloadColumn,
    Progress,
    TaskID,
    TaskProgressColumn,
    TextColumn,
    TimeRemainingColumn,
    TransferSpeedColumn,
)


@dataclass(slots=True)
class PipeObject:
    """Unified pipeline object for tracking files, metadata, tag values, and relationships through the pipeline.
    
    This is the single source of truth for all result data in the pipeline. Uses the hash+store
    canonical pattern for file identification.
    
    Attributes:
        hash: SHA-256 hash of the file (canonical identifier)
        store: Storage backend name (e.g., 'default', 'hydrus', 'test', 'home')
        tag: List of extracted or assigned tag values
        title: Human-readable title if applicable
        source_url: URL where the object came from
        duration: Duration in seconds if applicable
        metadata: Full metadata dictionary from source
        warnings: Any warnings or issues encountered
        path: Path to the file if this object represents a file
        relationships: Relationship data (king/alt/related hashes)
        is_temp: If True, this is a temporary/intermediate artifact that may be cleaned up
        action: The cmdlet that created this object (format: 'cmdlet:cmdlet_name')
        parent_hash: Hash of the parent file in the pipeline chain (for tracking provenance/lineage)
        extra: Additional fields not covered above
    """
    hash: str
    store: str
    provider: Optional[str] = None
    tag: List[str] = field(default_factory=list)
    title: Optional[str] = None
    url: Optional[str] = None
    source_url: Optional[str] = None
    duration: Optional[float] = None
    metadata: Dict[str, Any] = field(default_factory=dict)
    warnings: List[str] = field(default_factory=list)
    path: Optional[str] = None
    relationships: Dict[str, Any] = field(default_factory=dict)
    is_temp: bool = False
    action: Optional[str] = None
    parent_hash: Optional[str] = None
    extra: Dict[str, Any] = field(default_factory=dict)

    def add_relationship(self, rel_type: str, rel_hash: str) -> None:
        """Add a relationship hash.
        
        Args:
            rel_type: Relationship type ('king', 'alt', 'related')
            rel_hash: Hash to add to the relationship
        """
        if rel_type not in self.relationships:
            self.relationships[rel_type] = []
        
        if isinstance(self.relationships[rel_type], list):
            if rel_hash not in self.relationships[rel_type]:
                self.relationships[rel_type].append(rel_hash)
        else:
            # Single value (e.g., king), convert to that value
            self.relationships[rel_type] = rel_hash
    
    def get_relationships(self) -> Dict[str, Any]:
        """Get all relationships for this object."""
        return self.relationships.copy() if self.relationships else {}

    def debug_table(self) -> None:
        """Rich-inspect the PipeObject when debug logging is enabled."""
        try:
            from SYS.logger import is_debug_enabled, debug_inspect
        except Exception:
            return

        if not is_debug_enabled():
            return

        # Prefer a stable, human-friendly title:
        #   "1 - download-media", "2 - download-media", ...
        # The index is preserved when possible via `pipe_index` in the PipeObject's extra.
        idx = None
        try:
            if isinstance(self.extra, dict):
                idx = self.extra.get("pipe_index")
        except Exception:
            idx = None

        cmdlet_name = "PipeObject"
        try:
            import pipeline as ctx
            current = ctx.get_current_cmdlet_name("") if hasattr(ctx, "get_current_cmdlet_name") else ""
            if current:
                cmdlet_name = current
            else:
                action = str(self.action or "").strip()
                if action.lower().startswith("cmdlet:"):
                    cmdlet_name = action.split(":", 1)[1].strip() or cmdlet_name
                elif action:
                    cmdlet_name = action
        except Exception:
            cmdlet_name = "PipeObject"

        title_text = cmdlet_name
        try:
            if idx is not None and str(idx).strip():
                title_text = f"{idx} - {cmdlet_name}"
        except Exception:
            title_text = cmdlet_name

        # Color the title (requested: yellow instead of Rich's default blue-ish title).
        debug_inspect(self, title=f"[yellow]{title_text}[/yellow]")

    def to_dict(self) -> Dict[str, Any]:
        """Serialize to dictionary, excluding None and empty values."""
        data: Dict[str, Any] = {
            "hash": self.hash,
            "store": self.store,
        }

        if self.provider:
            data["provider"] = self.provider
        
        if self.tag:
            data["tag"] = self.tag
        if self.title:
            data["title"] = self.title
        if self.url:
            data["url"] = self.url
        if self.source_url:
            data["source_url"] = self.source_url
        if self.duration is not None:
            data["duration"] = self.duration
        if self.metadata:
            data["metadata"] = self.metadata
        if self.warnings:
            data["warnings"] = self.warnings
        if self.path:
            data["path"] = self.path
        if self.relationships:
            data["relationships"] = self.relationships
        if self.is_temp:
            data["is_temp"] = self.is_temp
        if self.action:
            data["action"] = self.action
        if self.parent_hash:
            data["parent_hash"] = self.parent_hash
        
        # Add extra fields
        data.update({k: v for k, v in self.extra.items() if v is not None})
        return data


class FileRelationshipTracker:
    """Track relationships between files for sidecar creation.
    
    Allows tagging files with their relationships to other files:
    - king: The primary/master version of a file
    - alt: Alternate versions of the same content
    - related: Related files (e.g., screenshots of a book)
    """
    
    def __init__(self) -> None:
        self.relationships: Dict[str, Dict[str, Any]] = {}
    
    def register_king(self, file_path: str, file_hash: str) -> None:
        """Register a file as the king (primary) version."""
        if file_path not in self.relationships:
            self.relationships[file_path] = {}
        self.relationships[file_path]["king"] = file_hash
    
    def add_alt(self, file_path: str, alt_hash: str) -> None:
        """Add an alternate version of a file."""
        if file_path not in self.relationships:
            self.relationships[file_path] = {}
        if "alt" not in self.relationships[file_path]:
            self.relationships[file_path]["alt"] = []
        if alt_hash not in self.relationships[file_path]["alt"]:
            self.relationships[file_path]["alt"].append(alt_hash)
    
    def add_related(self, file_path: str, related_hash: str) -> None:
        """Add a related file."""
        if file_path not in self.relationships:
            self.relationships[file_path] = {}
        if "related" not in self.relationships[file_path]:
            self.relationships[file_path]["related"] = []
        if related_hash not in self.relationships[file_path]["related"]:
            self.relationships[file_path]["related"].append(related_hash)
    
    def get_relationships(self, file_path: str) -> Optional[Dict[str, Any]]:
        """Get relationships for a file."""
        return self.relationships.get(file_path)
    
    def link_files(self, primary_path: str, king_hash: str, *alt_paths: str) -> None:
        """Link files together with primary as king and others as alternates.
        
        Args:
            primary_path: Path to the primary file (will be marked as 'king')
            king_hash: Hash of the primary file
            alt_paths: Paths to alternate versions (will be marked as 'alt')
        """
        self.register_king(primary_path, king_hash)
        for alt_path in alt_paths:
            try:
                alt_hash = _get_file_hash(alt_path)
                self.add_alt(primary_path, alt_hash)
            except Exception as e:
                import sys
                print(f"Error hashing {alt_path}: {e}", file=sys.stderr)


def _get_file_hash(filepath: str) -> str:
    """Calculate SHA256 hash of a file."""
    sha256_hash = hashlib.sha256()
    with open(filepath, "rb") as f:
        for byte_block in iter(lambda: f.read(4096), b""):
            sha256_hash.update(byte_block)
    return sha256_hash.hexdigest()


# ============= Download Module Classes =============

class DownloadError(RuntimeError):
    """Raised when the download or Hydrus import fails."""


@dataclass(slots=True)
class DownloadOptions:
    """Configuration for downloading media.
    
    Use the add-file cmdlet separately for Hydrus import.
    """
    url: str
    mode: str  # "audio" or "video"
    output_dir: Path
    cookies_path: Optional[Path] = None
    ytdl_format: Optional[str] = None
    extra_tags: Optional[List[str]] = None
    debug_log: Optional[Path] = None
    native_progress: bool = False
    clip_sections: Optional[str] = None
    playlist_items: Optional[str] = None  # yt-dlp --playlist-items format (e.g., "1-3,5,8")
    no_playlist: bool = False  # If True, pass --no-playlist to yt-dlp
    quiet: bool = False  # If True, suppress all console output (progress, debug logs)
    embed_chapters: bool = False  # If True, pass yt-dlp --embed-chapters / embedchapters
    write_sub: bool = False  # If True, download subtitles (writesubtitles/writeautomaticsub)


class SendFunc(Protocol):
    """Protocol for event sender function."""
    def __call__(self, event: str, **payload: Any) -> None:
        ...


@dataclass(slots=True)
class DownloadMediaResult:
    """Result of a successful media download."""
    path: Path
    info: Dict[str, Any]
    tag: List[str]
    source_url: Optional[str]
    hash_value: Optional[str] = None
    paths: Optional[List[Path]] = None  # For multiple files (e.g., section downloads)


@dataclass(slots=True)
class DebugLogger:
    """Logs events to a JSON debug file for troubleshooting downloads."""
    path: Path
    file: Optional[TextIO] = None
    session_started: bool = False

    def ensure_open(self) -> None:
        """Open the debug log file if not already open."""
        if self.file is not None:
            return
        try:
            parent = self.path.parent
            if parent and not parent.exists():
                parent.mkdir(parents=True, exist_ok=True)
            self.file = self.path.open("a", encoding="utf-8")
        except OSError as exc:  # pragma: no cover - surfaces to stderr
            print(f"Failed to open debug log {self.path}: {exc}", file=sys.stderr)
            self.file = None
            return
        self._write_session_header()

    def _write_session_header(self) -> None:
        """Write session start marker to log."""
        if self.session_started:
            return
        self.session_started = True
        self.write_record("session-start", {"pid": os.getpid(), "exe": sys.executable})

    def write_raw(self, text: str) -> None:
        """Write raw text to debug log."""
        self.ensure_open()
        if self.file is None:
            return
        self.file.write(text + "\n")
        self.file.flush()

    def write_record(self, event: str, payload: Optional[Dict[str, Any]] = None) -> None:
        """Write a structured event record to debug log."""
        record = {
            "timestamp": datetime.datetime.utcnow().isoformat(timespec="seconds") + "Z",
            "event": event,
            "payload": payload,
        }
        self.write_raw(json.dumps(_sanitise_for_json(record), ensure_ascii=False))

    def close(self) -> None:
        """Close the debug log file."""
        if self.file is None:
            return
        try:
            self.file.close()
        finally:
            self.file = None


def _sanitise_for_json(value: Any, *, max_depth: int = 8, _seen: Optional[set[int]] = None) -> Any:
    """Best-effort conversion to JSON-serialisable types without raising on cycles."""
    import math
    from dataclasses import asdict, is_dataclass

    if value is None or isinstance(value, (str, bool)):
        return value
    if isinstance(value, (int, float)):
        if isinstance(value, float) and not math.isfinite(value):
            return repr(value)
        return value
    if isinstance(value, Path):
        return str(value)
    if isinstance(value, bytes):
        try:
            return value.decode()
        except Exception:
            return value.hex()

    if max_depth <= 0:
        return repr(value)

    if _seen is None:
        _seen = set()

    obj_id = id(value)
    if obj_id in _seen:
        return "<circular>"

    _seen.add(obj_id)
    try:
        if isinstance(value, dict):
            return {
                str(key): _sanitise_for_json(val, max_depth=max_depth - 1, _seen=_seen)
                for key, val in value.items()
            }
        if isinstance(value, (list, tuple, set)):
            iterable = value if not isinstance(value, set) else list(value)
            return [
                _sanitise_for_json(item, max_depth=max_depth - 1, _seen=_seen)
                for item in iterable
            ]
        if is_dataclass(value) and not isinstance(value, type):
            return _sanitise_for_json(asdict(value), max_depth=max_depth - 1, _seen=_seen)
    finally:
        _seen.discard(obj_id)

    return repr(value)

class ProgressBar:
    """Rich progress helper for byte-based transfers.

    Opinionated: requires `rich` and always renders via Rich.
    """

    def __init__(self, width: Optional[int] = None):
        """Initialize progress bar with optional custom width."""
        if width is None:
            width = shutil.get_terminal_size((80, 20))[0]
        self.width = max(40, width)  # Minimum 40 chars for readability

        self._console: Optional[Console] = None
        self._progress: Optional[Progress] = None
        self._task_id: Optional[TaskID] = None

    def _ensure_started(self, *, label: str, total: Optional[int], file: Any = None) -> None:
        if self._progress is not None and self._task_id is not None:
            if total is not None and total > 0:
                self._progress.update(self._task_id, total=int(total))
            return

        stream = file if file is not None else sys.stderr
        console = Console(file=stream)
        progress = Progress(
            TextColumn("[progress.description]{task.description}"),
            BarColumn(),
            TaskProgressColumn(),
            DownloadColumn(),
            TransferSpeedColumn(),
            TimeRemainingColumn(),
            console=console,
            transient=True,
        )
        progress.start()

        task_total = int(total) if isinstance(total, int) and total > 0 else None
        task_id: TaskID = progress.add_task(str(label or "download"), total=task_total)

        self._console = console
        self._progress = progress
        self._task_id = task_id

    def update(
        self,
        *,
        downloaded: Optional[int],
        total: Optional[int],
        label: str = "download",
        file: Any = None,
    ) -> None:
        if downloaded is None and total is None:
            return
        self._ensure_started(label=label, total=total, file=file)
        if self._progress is None or self._task_id is None:
            return
        if total is not None and total > 0:
            self._progress.update(self._task_id, completed=int(downloaded or 0), total=int(total), refresh=True)
        else:
            self._progress.update(self._task_id, completed=int(downloaded or 0), refresh=True)

    def finish(self) -> None:
        if self._progress is None:
            return
        try:
            self._progress.stop()
        finally:
            self._console = None
            self._progress = None
            self._task_id = None

    def format_bytes(self, bytes_val: Optional[float]) -> str:
        """Format bytes to human-readable size.
        
        Args:
            bytes_val: Number of bytes or None.
            
        Returns:
            Formatted string (e.g., "123.4 MB", "1.2 GB").
        """
        if bytes_val is None or bytes_val <= 0:
            return "?.? B"
        
        for unit in ("B", "KB", "MB", "GB", "TB"):
            if bytes_val < 1024:
                return f"{bytes_val:.1f} {unit}"
            bytes_val /= 1024
        
        return f"{bytes_val:.1f} PB"

    # NOTE: rich.Progress handles the visual formatting; format_bytes remains as a general utility.


class ProgressFileReader:
    """File-like wrapper that prints a ProgressBar as bytes are read.

    Intended for uploads: pass this wrapper as the file object to httpx/requests.
    Progress is written to stderr (so pipelines remain clean).
    """

    def __init__(self, fileobj: Any, *, total_bytes: Optional[int], label: str = "upload", min_interval_s: float = 0.25):
        self._f = fileobj
        self._total = int(total_bytes) if total_bytes not in (None, 0, "") else 0
        self._label = str(label or "upload")
        self._min_interval_s = max(0.05, float(min_interval_s))
        self._bar = ProgressBar()
        self._start = time.time()
        self._last = self._start
        self._read = 0
        self._done = False

    def _render(self) -> None:
        if self._done:
            return
        if self._total <= 0:
            return
        now = time.time()
        if now - self._last < self._min_interval_s:
            return
        self._bar.update(downloaded=int(self._read), total=int(self._total), label=str(self._label or "upload"), file=sys.stderr)
        self._last = now

    def _finish(self) -> None:
        if self._done:
            return
        self._done = True
        self._bar.finish()

    def read(self, size: int = -1) -> Any:
        chunk = self._f.read(size)
        try:
            if chunk:
                self._read += len(chunk)
                self._render()
            else:
                # EOF
                self._finish()
        except Exception:
            pass
        return chunk

    def seek(self, offset: int, whence: int = 0) -> Any:
        out = self._f.seek(offset, whence)
        try:
            pos = int(self._f.tell())
            if pos <= 0:
                self._read = 0
                self._start = time.time()
                self._last = self._start
            else:
                self._read = pos
        except Exception:
            pass
        return out

    def tell(self) -> Any:
        return self._f.tell()

    def close(self) -> None:
        try:
            self._finish()
        except Exception:
            pass
        return self._f.close()

    def __getattr__(self, name: str) -> Any:
        return getattr(self._f, name)


# ============================================================================
# PIPELINE EXECUTION CONTEXT
# Consolidated from pipeline_context.py
# ============================================================================
# Note: Pipeline functions and state variables moved to pipeline.py

class PipelineStageContext:
	"""Context information for the current pipeline stage."""
	
	def __init__(self, stage_index: int, total_stages: int, worker_id: Optional[str] = None):
		self.stage_index = stage_index
		self.total_stages = total_stages
		self.is_last_stage = (stage_index == total_stages - 1)
		self.worker_id = worker_id
		self.emits: List[Any] = []
	
	def emit(self, obj: Any) -> None:
		"""Emit an object to the next pipeline stage."""
		self.emits.append(obj)
	
	def get_current_command_text(self) -> str:
		"""Get the current command text (for backward compatibility)."""
		# This is maintained for backward compatibility with old code
		# In a real implementation, this would come from the stage context
		return ""
	
	def __repr__(self) -> str:
		return f"PipelineStageContext(stage={self.stage_index}/{self.total_stages}, is_last={self.is_last_stage}, worker_id={self.worker_id})"


# ============================================================================
# RESULT TABLE CLASSES
# Consolidated from result_table.py
# ============================================================================

@dataclass
class InputOption:
    """Represents an interactive input option (cmdlet argument) in a table.
    
    Allows users to select options that translate to cmdlet arguments,
    enabling interactive configuration right from the result table.
    
    Example:
        # Create an option for location selection
        location_opt = InputOption(
            "location",
            type="enum",
            choices=["local", "hydrus", "0x0"],
            description="Download destination"
        )
        
        # Use in result table
        table.add_input_option(location_opt)
        selected = table.select_option("location")  # Returns user choice
    """
    name: str
    """Option name (maps to cmdlet argument)"""
    type: str = "string"
    """Option type: 'string', 'enum', 'flag', 'integer'"""
    choices: List[str] = field(default_factory=list)
    """Valid choices for enum type"""
    default: Optional[str] = None
    """Default value if not specified"""
    description: str = ""
    """Description of what this option does"""
    validator: Optional[Callable[[str], bool]] = None
    """Optional validator function: takes value, returns True if valid"""
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary."""
        return {
            "name": self.name,
            "type": self.type,
            "choices": self.choices if self.choices else None,
            "default": self.default,
            "description": self.description,
        }


@dataclass
class TUIResultCard:
    """Represents a result as a UI card with title, metadata, and actions.
    
    Used in hub-ui and TUI contexts to render individual search results 
    as grouped components with visual structure.
    """
    title: str
    subtitle: Optional[str] = None
    metadata: Optional[Dict[str, str]] = None
    media_kind: Optional[str] = None
    tag: Optional[List[str]] = None
    file_hash: Optional[str] = None
    file_size: Optional[str] = None
    duration: Optional[str] = None
    
    def __post_init__(self):
        """Initialize default values."""
        if self.metadata is None:
            self.metadata = {}
        if self.tag is None:
            self.tag = []


@dataclass
class ResultColumn:
    """Represents a single column in a result table."""
    name: str
    value: str
    width: Optional[int] = None
    
    def __str__(self) -> str:
        """String representation of the column."""
        return f"{self.name}: {self.value}"
    
    def to_dict(self) -> Dict[str, str]:
        """Convert to dictionary."""
        return {"name": self.name, "value": self.value}


@dataclass
class ResultRow:
    """Represents a single row in a result table."""
    columns: List[ResultColumn] = field(default_factory=list)
    
    def add_column(self, name: str, value: Any) -> None:
        """Add a column to this row."""
        str_value = str(value) if value is not None else ""
        self.columns.append(ResultColumn(name, str_value))
    
    def get_column(self, name: str) -> Optional[str]:
        """Get column value by name."""
        for col in self.columns:
            if col.name.lower() == name.lower():
                return col.value
        return None
    
    def to_dict(self) -> List[Dict[str, str]]:
        """Convert to list of column dicts."""
        return [col.to_dict() for col in self.columns]
    
    def to_list(self) -> List[tuple[str, str]]:
        """Convert to list of (name, value) tuples."""
        return [(col.name, col.value) for col in self.columns]
    
    def __str__(self) -> str:
        """String representation of the row."""
        return " | ".join(str(col) for col in self.columns)