class SongModel {
  final int id;
  final String title;
  final String artist;
  final Map<String, dynamic>? utTitle; // 可选，根据不同版本标题可能不同
  final List<String> albums;
  final bool hasDx;
  final bool hasSd;
  final bool hasUt;
  final String genre;
  final int bpm;
  final String releaseDate;
  final String from;

  // 难度详情映射 key通常是 "0"(Basic), "1"(Advanced) 等，或者 ut 的特殊id
  final Map<String, dynamic>? dxLevels;
  final Map<String, dynamic>? sdLevels;
  final Map<String, dynamic>? utLevels;

  SongModel({
    required this.id,
    required this.title,
    required this.artist,
    this.utTitle,
    required this.albums,
    required this.hasDx,
    required this.hasSd,
    required this.hasUt,
    required this.genre,
    required this.bpm,
    required this.releaseDate,
    required this.from,
    this.dxLevels,
    this.sdLevels,
    this.utLevels,
  });

  factory SongModel.fromJson(Map<String, dynamic> json) {
    return SongModel(
      id: json['id'] ?? 0,
      title: json['title'] ?? 'Unknown',
      artist: json['artist'] ?? 'Unknown',
      utTitle: json['utTitle'],
      albums: List<String>.from(json['albums'] ?? []),
      hasDx: json['hasDx'] ?? false,
      hasSd: json['hasSd'] ?? false,
      hasUt: json['hasUt'] ?? false,
      genre: json['genre'] ?? '',
      bpm: json['bpm'] ?? 0,
      releaseDate: json['releaseDate'] ?? '',
      from: json['from'] ?? '',
      dxLevels: json['dx'],
      sdLevels: json['sd'],
      utLevels: json['ut'],
    );
  }
}

// 用于存储本地缓存的版本信息
class SongCacheInfo {
  final int songSize;
  final String version;
  final DateTime lastUpdate;

  SongCacheInfo({required this.songSize, required this.version, required this.lastUpdate});

  Map<String, dynamic> toJson() => {
    'songSize': songSize,
    'version': version,
    'lastUpdate': lastUpdate.millisecondsSinceEpoch,
  };

  factory SongCacheInfo.fromJson(Map<String, dynamic> json) {
    return SongCacheInfo(
      songSize: json['songSize'] ?? 0,
      version: json['version'] ?? '',
      lastUpdate: DateTime.fromMillisecondsSinceEpoch(json['lastUpdate'] ?? 0),
    );
  }
}