import datetime
import sqlite3
from pathlib import Path
from typing import List, Dict, Any, Optional, Sequence

from SYS.cmdlet_spec import Cmdlet, CmdletArg
from SYS.config import (
    load_config,
    save_config,
    save_config_and_verify,
    set_nested_config_value,
)
from SYS.database import LOG_DB_PATH, db
from SYS.logger import log
from SYS import pipeline as ctx
from SYS.result_table import Table
from cmdnat._parsing import (
    extract_piped_value as _extract_piped_value,
    extract_value_arg as _extract_value_arg,
    has_flag as _has_flag,
)

CMDLET = Cmdlet(
    name=".config",
    summary="Manage configuration settings",
    usage=".config [key] [value] | .config -log [count]",
    arg=[
        CmdletArg(
            name="key",
            description="Configuration key to update (dot-separated)",
            required=False
        ),
        CmdletArg(
            name="value",
            description="New value for the configuration key",
            required=False
        ),
    ],
)


def _extract_log_limit(args: Sequence[str], default: int = 30) -> int:
    try:
        tokens = [str(arg).strip() for arg in (args or []) if str(arg).strip()]
    except Exception:
        return default

    for idx, token in enumerate(tokens):
        lowered = token.lower()
        if lowered in {"-log", "--log"}:
            if idx + 1 < len(tokens):
                candidate = tokens[idx + 1]
                if candidate and not candidate.startswith("-"):
                    try:
                        return max(1, min(200, int(candidate)))
                    except Exception:
                        return default
            return default
        if lowered.startswith("-log=") or lowered.startswith("--log="):
            _, value = lowered.split("=", 1)
            try:
                return max(1, min(200, int(value)))
            except Exception:
                return default
    return default


def _fallback_log_path() -> Path:
    return Path(db.db_path).with_name("logs") / "log_fallback.txt"


def _load_recent_config_logs(limit: int = 30) -> List[Dict[str, str]]:
    rows: List[Dict[str, str]] = []
    sql = """
        SELECT timestamp, level, module, message
        FROM logs
        WHERE lower(module) LIKE ?
           OR lower(message) LIKE ?
           OR lower(message) LIKE ?
           OR lower(message) LIKE ?
        ORDER BY id DESC
        LIMIT ?
    """
    params = (
        "%config%",
        "%config%",
        "%save failed%",
        "%saving configuration failed%",
        int(limit),
    )

    try:
        with sqlite3.connect(str(LOG_DB_PATH), timeout=5.0) as conn:
            conn.row_factory = sqlite3.Row
            cur = conn.cursor()
            cur.execute(sql, params)
            fetched = cur.fetchall()
            cur.close()
        for row in fetched:
            rows.append(
                {
                    "timestamp": str(row["timestamp"] or ""),
                    "level": str(row["level"] or ""),
                    "module": str(row["module"] or ""),
                    "message": str(row["message"] or ""),
                }
            )
    except Exception:
        rows = []

    if rows:
        return rows

    fallback = _fallback_log_path()
    try:
        if not fallback.exists():
            return []
        lines = fallback.read_text(encoding="utf-8", errors="replace").splitlines()
        matches = [
            line for line in lines
            if any(term in line.lower() for term in ("config", "save failed", "saving configuration failed"))
        ]
        for line in reversed(matches[-limit:]):
            rows.append(
                {
                    "timestamp": "",
                    "level": "FALLBACK",
                    "module": "fallback",
                    "message": line,
                }
            )
    except Exception:
        return []
    return rows


def _format_log_timestamp_local(raw_value: str) -> str:
    text = str(raw_value or "").strip()
    if not text:
        return ""
    for pattern in ("%Y-%m-%d %H:%M:%S", "%Y-%m-%d %H:%M:%S.%f"):
        try:
            parsed = datetime.datetime.strptime(text, pattern).replace(tzinfo=datetime.timezone.utc)
            return parsed.astimezone().strftime("%Y-%m-%d %H:%M:%S")
        except Exception:
            continue
    return text


def _show_config_logs(args: Sequence[str]) -> int:
    limit = _extract_log_limit(args)
    rows = _load_recent_config_logs(limit=limit)
    if not rows:
        print(
            f"No recent config/save logs found in {LOG_DB_PATH.name} or {_fallback_log_path().name}."
        )
        return 0

    table = Table("Configuration Logs")
    table.set_table("config.logs")
    table.set_source_command(".config", ["-log", str(limit)])

    for row_data in rows:
        row = table.add_row()
        row.add_column("Time (local)", _format_log_timestamp_local(row_data.get("timestamp", "")))
        row.add_column("Level", row_data.get("level", ""))
        row.add_column("Module", row_data.get("module", ""))
        row.add_column("Message", row_data.get("message", ""))

    ctx.set_last_result_table_overlay(table, rows)
    ctx.set_current_stage_table(table)
    print(f"Showing {len(rows)} recent configuration log entries.")
    return 0


def flatten_config(config: Dict[str, Any], parent_key: str = "", sep: str = ".") -> List[Dict[str, Any]]:
    items: List[Dict[str, Any]] = []
    for k, v in config.items():
        if k.startswith("_"):
            continue
        new_key = f"{parent_key}{sep}{k}" if parent_key else k
        if isinstance(v, dict):
            items.extend(flatten_config(v, new_key, sep=sep))
        else:
            items.append({
                "key": new_key,
                "value": v,
                "value_display": str(v),
                "type": type(v).__name__,
            })
    return items


def set_nested_config(config: Dict[str, Any], key: str, value: str) -> bool:
    return set_nested_config_value(config, key, value, on_error=print)


def _get_selected_config_key() -> Optional[str]:
    try:
        indices = ctx.get_last_selection() or []
    except Exception:
        indices = []
    try:
        items = ctx.get_last_result_items() or []
    except Exception:
        items = []
    if not indices or not items:
        return None
    idx = indices[0]
    if idx < 0 or idx >= len(items):
        return None
    item = items[idx]
    if isinstance(item, dict):
        return item.get("key")
    return getattr(item, "key", None)


def _show_config_table(config_data: Dict[str, Any]) -> int:
    items = flatten_config(config_data)
    if not items:
        print("No configuration entries available.")
        return 0
    items.sort(key=lambda x: x.get("key"))

    table = Table("Configuration")
    table.set_table("config")
    table.set_source_command(".config", [])

    for item in items:
        row = table.add_row()
        row.add_column("Key", item.get("key", ""))
        row.add_column("Value", item.get("value_display", ""))
        row.add_column("Type", item.get("type", ""))

    ctx.set_last_result_table_overlay(table, items)
    ctx.set_current_stage_table(table)
    return 0


def _strip_value_quotes(value: str) -> str:
    if not value:
        return value
    if (value.startswith('"') and value.endswith('"')) or (value.startswith("'") and value.endswith("'")):
        return value[1:-1]
    return value


def _run(piped_result: Any, args: List[str], config: Dict[str, Any]) -> int:
    import sys

    if _has_flag(args, "-log") or _has_flag(args, "--log"):
        return _show_config_logs(args)

    # Load configuration from the database
    current_config = load_config()

    selection_key = _get_selected_config_key()
    value_from_args = _extract_value_arg(args) if selection_key else None
    value_from_pipe = _extract_piped_value(piped_result)

    if selection_key:
        new_value = value_from_pipe or value_from_args
        if not new_value:
            print(
                "Provide a new value via pipe or argument: @N | .config <value>"
            )
            return 1
        new_value = _strip_value_quotes(new_value)
        try:
            set_nested_config(current_config, selection_key, new_value)
            # For AllDebrid API changes, use the verified save path to ensure
            # the new API key persisted to disk; otherwise fall back to normal save.
            try:
                key_l = str(selection_key or "").lower()
            except Exception:
                key_l = ""
            if "alldebrid" in key_l or "all-debrid" in key_l:
                try:
                    save_config_and_verify(current_config)
                except Exception as exc:
                    log(f"Configuration save verification failed for '{selection_key}': {exc}")
                    print(f"Error saving configuration (verification failed): {exc}")
                    return 1
            else:
                save_config(current_config)
            print(f"Updated '{selection_key}' to '{new_value}'")
            return 0
        except Exception as exc:
            log(f"Error updating config '{selection_key}': {exc}")
            print(f"Error updating config: {exc}")
            return 1

    if not args:
        # Check if we're in an interactive terminal and can launch a Textual modal
        if sys.stdin.isatty() and not piped_result:
            try:
                from textual.app import App
                from TUI.modalscreen.config_modal import ConfigModal
                
                class ConfigApp(App):
                    def on_mount(self) -> None:
                        self.title = "Config Editor"
                        # We push the modal screen. It will sit on top of the main (blank) screen.
                        # Using a callback to exit the app when the modal is dismissed.
                        self.push_screen(ConfigModal(), callback=self.exit_on_close)
                    
                    def exit_on_close(self, result: Any = None) -> None:
                        self.exit()
                
                with ctx.suspend_live_progress():
                    app = ConfigApp()
                    app.run()
                
                # After modal exits, show the new status table if possible
                try:
                    from cmdlet._shared import SharedArgs
                    from cmdnat.status import CMDLET as STATUS_CMDLET
                    # We reload the config one more time because it might have changed on disk
                    fresh_config = load_config()
                    
                    # Force refresh of shared caches (especially stores)
                    SharedArgs._refresh_store_choices_cache(fresh_config)
                    # Update the global SharedArgs choices so cmdlets pick up new stores
                    SharedArgs.STORE.choices = SharedArgs.get_store_choices(fresh_config, force=True)
                    
                    return STATUS_CMDLET.exec(None, [], fresh_config)
                except Exception:
                    pass
                return 0
            except Exception as exc:
                # Fall back to table display if Textual modal fails
                print(f"Note: Could not launch interactive editor ({exc}). Showing configuration table:")
                return _show_config_table(current_config)
        
        return _show_config_table(current_config)

    key = args[0]
    if len(args) < 2:
        print(f"Error: Value required for key '{key}'")
        return 1

    value = _strip_value_quotes(" ".join(args[1:]))
    try:
        set_nested_config(current_config, key, value)
        save_config(current_config)
        print(f"Updated '{key}' to '{value}'")
        return 0
    except Exception as exc:
        log(f"Error updating config '{key}': {exc}")
        print(f"Error updating config: {exc}")
        return 1


CMDLET.exec = _run