"""Channel loading and path configuration."""

import json
import re
from pathlib import Path

from .config import CHANNELS_FILE, MOVIES_ROOT, SERIES_ROOT


def resolve_path(path_key: str) -> Path | None:
    """Resolve a channel path key to an absolute Path. Returns None if invalid."""
    path_key = path_key.strip("/")
    if path_key == "movies":
        return MOVIES_ROOT
    if path_key.startswith("series/"):
        subpath = path_key[7:]
        return SERIES_ROOT / subpath
    return None


def normalize_path_config(entry) -> dict:
    """
    Normalize a path entry from channels.json. Entry can be:
    - String: "series/W817" -> {path_key, display_name, tmdb_search, tmdb_id}
    - Object: {"path": "series/W817", "display_name": "...", "tmdb_search": "...", "tmdb_id": ...}
    """
    if isinstance(entry, str):
        return {"path_key": entry.strip(), "display_name": None, "tmdb_search": None, "tmdb_id": None}
    if isinstance(entry, dict):
        path_key = (entry.get("path") or entry.get("path_key") or "").strip()
        if not path_key:
            return {"path_key": "", "display_name": None, "tmdb_search": None, "tmdb_id": None}
        raw_id = entry.get("tmdb_id")
        tmdb_id = None
        if raw_id is not None:
            if isinstance(raw_id, int) and raw_id > 0:
                tmdb_id = raw_id
            else:
                m = re.match(r"^(\d+)", str(raw_id).strip())
                if m:
                    tmdb_id = int(m.group(1))
        return {
            "path_key": path_key,
            "display_name": (entry.get("display_name") or "").strip() or None,
            "tmdb_search": (entry.get("tmdb_search") or "").strip() or None,
            "tmdb_id": tmdb_id,
        }
    return {"path_key": "", "display_name": None, "tmdb_search": None, "tmdb_id": None}


class ChannelRepository:
    """Loads and provides channel configuration from channels.json."""

    def __init__(self, channels_file: Path = CHANNELS_FILE):
        self._channels_file = channels_file

    def get_all(self) -> list[dict]:
        """Load and return all channels."""
        if not self._channels_file.exists():
            return []
        with open(self._channels_file, encoding="utf-8") as f:
            data = json.load(f)
        return data.get("channels", [])

    def get_by_id(self, channel_id: str) -> dict | None:
        """Return the channel with the given id, or None."""
        for ch in self.get_all():
            if ch.get("id") == channel_id:
                return ch
        return None