melo-app/lib/services/playlist_service.dart

import '../database/db_helper.dart';
import '../models/song.dart';
import '../models/playlist.dart';

class PlaylistService {
  final DbHelper _db = DbHelper();

  Future<List<Playlist>> allePlaylists() async {
    final rows = await _db.allePlaylists();
    final listen = <Playlist>[];
    for (final r in rows) {
      final id = r['id'] as int;
      final songs = await _db.songsDerPlaylist(id);
      listen.add(Playlist.fromMap(r, songCount: songs.length));
    }
    return listen;
  }

  Future<int> erstellen(String name) async {
    return _db.playlistErstellen(name);
  }

  Future<List<Song>> songs(int playlistId) async {
    return _db.songsDerPlaylist(playlistId);
  }

  Future<void> songHinzufuegen(int playlistId, int songId) async {
    final songs = await _db.songsDerPlaylist(playlistId);
    await _db.songZurPlaylist(playlistId, songId, songs.length);
  }

  Future<void> songEntfernen(int playlistId, int songId) async {
    await _db.songAusPlaylistEntfernen(playlistId, songId);
  }

  Future<void> reihenfolgeSpeichern(int playlistId, List<Song> songs) async {
    final songIds = songs.map((s) => s.id).whereType<int>().toList();
    await _db.playlistReihenfolgeAktualisieren(playlistId, songIds);
  }

  Future<bool> istInPlaylist(int playlistId, int songId) async {
    final songs = await _db.songsDerPlaylist(playlistId);
    return songs.any((s) => s.id == songId);
  }
}