import 'package:flutter/foundation.dart';

/// A saved Jellyfin selection in the genre picker.
@immutable
class JellyfinGenreSelection {
  const JellyfinGenreSelection({required this.id, required this.label});

  final String id;
  final String label;

  factory JellyfinGenreSelection.fromJson(Map<String, dynamic> json) {
    return JellyfinGenreSelection(
      id: (json['id'] as String?) ?? '',
      label: (json['label'] as String?) ?? '',
    );
  }

  Map<String, Object?> toJson() => {'id': id, 'label': label};

  @override
  bool operator ==(Object other) {
    return other is JellyfinGenreSelection &&
        other.id == id &&
        other.label == label;
  }

  @override
  int get hashCode => Object.hash(id, label);

  @override
  String toString() => label;
}

/// A canonical genre family such as Metal, Rock or Jazz. Raw genres keep their
/// server spelling; [rawGenres] is what the random query expands to.
@immutable
class JellyfinGenreFamily {
  const JellyfinGenreFamily({
    required this.id,
    required this.label,
    required this.rawGenres,
    required this.isStandalone,
  });

  final String id;
  final String label;
  final List<String> rawGenres;
  final bool isStandalone;

  int get rawCount => rawGenres.length;

  @override
  bool operator ==(Object other) {
    return other is JellyfinGenreFamily && other.id == id;
  }

  @override
  int get hashCode => id.hashCode;
}

/// One raw genre on the server and the family it belongs to.
@immutable
class JellyfinGenre {
  const JellyfinGenre({
    required this.name,
    required this.familyId,
    required this.familyLabel,
  });

  final String name;
  final String familyId;
  final String familyLabel;
}

/// An album row in the Jellyfin dashboard.
@immutable
class JellyfinAlbum {
  const JellyfinAlbum({
    required this.id,
    required this.name,
    required this.artist,
    this.year,
    this.imageTag,
    this.childCount,
    this.dateCreated,
    this.lastPlayed,
  });

  final String id;
  final String name;
  final String artist;
  final int? year;
  final String? imageTag;
  final int? childCount;
  final DateTime? dateCreated;
  final DateTime? lastPlayed;

  bool get hasArtwork => (imageTag?.isNotEmpty ?? false);

  factory JellyfinAlbum.fromJson(Map<String, dynamic> json) {
    return JellyfinAlbum(
      id: _string(json['Id']),
      name: _string(json['Name']),
      artist: _albumArtist(json),
      year: _int(json['ProductionYear']),
      imageTag:
          _imageTag(json['ImageTags']) ??
          _stringOrNull(json['AlbumPrimaryImageTag']),
      childCount: _int(json['ChildCount']),
      dateCreated: _date(json['DateCreated']),
      lastPlayed: _lastPlayed(json['UserData']),
    );
  }

  /// Builds an album card from a played Audio item.
  factory JellyfinAlbum.fromTrack(JellyfinTrack track) {
    return JellyfinAlbum(
      id: track.albumId,
      name: track.album.isEmpty ? track.name : track.album,
      artist: track.artist,
      year: track.year,
      imageTag: track.albumImageTag,
      lastPlayed: track.lastPlayed,
    );
  }

  /// Builds an album card from a played Audio item. Jellyfin 12.2 updates the
  /// track's user data, not the album's, so the recently-played row is built
  /// from tracks and deduped by album id.
  factory JellyfinAlbum.fromTrackJson(Map<String, dynamic> json) {
    final albumId = _string(json['AlbumId']);
    return JellyfinAlbum(
      id: albumId.isNotEmpty ? albumId : _string(json['ParentId']),
      name: _stringOrNull(json['Album']) ?? _string(json['Name']),
      artist: _albumArtist(json),
      year: _int(json['ProductionYear']),
      imageTag:
          _stringOrNull(json['AlbumPrimaryImageTag']) ??
          _imageTag(json['ImageTags']),
      childCount: _int(json['ChildCount']),
      dateCreated: _date(json['DateCreated']),
      lastPlayed: _lastPlayed(json['UserData']),
    );
  }

  @override
  bool operator ==(Object other) {
    return other is JellyfinAlbum && other.id == id;
  }

  @override
  int get hashCode => id.hashCode;

  @override
  String toString() => name;
}

/// A playable audio track. [mediaSourceId] is what Jellyfin playback reporting
/// and the stream endpoint expect; [duration] comes from `RunTimeTicks`.
@immutable
class JellyfinTrack {
  const JellyfinTrack({
    required this.id,
    required this.name,
    required this.albumId,
    required this.album,
    required this.artist,
    required this.indexNumber,
    required this.parentIndexNumber,
    required this.duration,
    required this.mediaSourceId,
    this.container,
    this.codec,
    this.genres = const [],
    this.lastPlayed,
    this.albumImageTag,
    this.year,
  });

  final String id;
  final String name;
  final String albumId;
  final String album;
  final String artist;
  final int? indexNumber;
  final int? parentIndexNumber;
  final Duration duration;
  final String mediaSourceId;
  final String? container;
  final String? codec;
  final List<String> genres;
  final DateTime? lastPlayed;
  final String? albumImageTag;
  final int? year;

  String get displayIndex {
    final track = indexNumber;
    if (track == null) return '';
    final disc = parentIndexNumber;
    if (disc != null && disc > 1) return '$disc.$track';
    return '$track';
  }

  factory JellyfinTrack.fromJson(Map<String, dynamic> json) {
    final sources = json['MediaSources'];
    final source = sources is List && sources.isNotEmpty ? sources.first : null;
    final sourceMap = source is Map ? source : null;
    final streams = sourceMap?['MediaStreams'];
    final stream = streams is List && streams.isNotEmpty ? streams.first : null;
    final streamMap = stream is Map ? stream : null;
    final ticks = _int(json['RunTimeTicks']) ?? 0;
    return JellyfinTrack(
      id: _string(json['Id']),
      name: _string(json['Name']),
      albumId:
          _stringOrNull(json['AlbumId']) ??
          _stringOrNull(json['ParentId']) ??
          '',
      album: _string(json['Album']),
      artist: _albumArtist(json),
      indexNumber: _int(json['IndexNumber']),
      parentIndexNumber: _int(json['ParentIndexNumber']),
      duration: Duration(microseconds: ticks ~/ 10),
      mediaSourceId: _string(sourceMap?['Id']),
      container: _stringOrNull(sourceMap?['Container']),
      codec: _stringOrNull(streamMap?['Codec']),
      genres: _stringList(json['Genres']),
      lastPlayed: _lastPlayed(json['UserData']),
      albumImageTag: _stringOrNull(json['AlbumPrimaryImageTag']),
      year: _int(json['ProductionYear']),
    );
  }

  @override
  bool operator ==(Object other) {
    return other is JellyfinTrack && other.id == id;
  }

  @override
  int get hashCode => id.hashCode;

  @override
  String toString() => name;
}

String _string(Object? value) => value is String ? value : '';

String? _stringOrNull(Object? value) {
  if (value is! String) return null;
  final trimmed = value.trim();
  return trimmed.isEmpty ? null : trimmed;
}

int? _int(Object? value) {
  if (value is num) return value.toInt();
  if (value is String) return int.tryParse(value);
  return null;
}

DateTime? _date(Object? value) {
  if (value is! String) return null;
  return DateTime.tryParse(value);
}

DateTime? _lastPlayed(Object? userData) {
  if (userData is! Map) return null;
  return _date(userData['LastPlayedDate']);
}

String? _imageTag(Object? imageTags) {
  if (imageTags is! Map) return null;
  return _stringOrNull(imageTags['Primary']);
}

String _albumArtist(Map<String, dynamic> json) {
  final albumArtist = _stringOrNull(json['AlbumArtist']);
  if (albumArtist != null) return albumArtist;
  final artists = _stringList(json['Artists']);
  if (artists.isNotEmpty) return artists.join(', ');
  final albumArtists = json['AlbumArtists'];
  if (albumArtists is List) {
    final names = albumArtists
        .whereType<Map>()
        .map((entry) => _stringOrNull(entry['Name']))
        .whereType<String>()
        .toList(growable: false);
    if (names.isNotEmpty) return names.join(', ');
  }
  return '';
}

List<String> _stringList(Object? value) {
  if (value is! List) return const [];
  return value.whereType<String>().toList(growable: false);
}