from mopidy.models import Playlist

class SmartPlaylistsProvider(PlaylistProvider):
    def __init__(self, backend, config):
        super().__init__(backend=backend)
        self.config = config
        self.max_tracks = int(config.get("max_tracks") or 50)
        raw_genres = config.get("genres") or ""
        self.fixed_genres = [g.strip() for g in raw_genres.split(",") if g.strip()]

    def as_list(self):
        """Return available playlists"""
        playlists = [
            Playlist(uri=f"smart:genre:{g}", name=f"[Smart] Genre: {g.title()}")
            for g in self.fixed_genres
        ]
        return playlists

    def lookup(self, uri):
        parts = uri.split(":")
        if len(parts) < 3 or parts[1] != "genre":
            return None
        genre = ":".join(parts[2:])
        return self._playlist_for_genre(uri, genre)

    def _playlist_for_genre(self, uri, genre):
        """Search the library for tracks with the specified genre"""
        tracks = []
        query = {"genre": [genre]}
        for result in self.backend.library.search(query):
            for t in result.tracks:
                tracks.append(t)
                if len(tracks) >= self.max_tracks:
                    break
            if len(tracks) >= self.max_tracks:
                break
        return Playlist(uri=uri, name=f"[Smart] Genre: {genre}", tracks=tracks[:self.max_tracks])