/// Feed 视频项（GET /videos/feed 列表项，对应服务端 video_service 输出）
class VideoItem {
  VideoItem({
    required this.videoId,
    this.title = '',
    this.coverUrl = '',
    this.videoUrl = '',
    this.duration = 0,
    required this.author,
    this.categoryId = 0,
    this.viewCount = 0,
    this.likeCount = 0,
    this.commentCount = 0,
    this.favoriteCount = 0,
    this.tags = const [],
    this.isLiked = false,
    this.isFavorited = false,
    this.description = '',
    this.status = -1,
    this.statusText = '',
    this.rejectReason = '',
  });

  final int videoId;
  final String title;
  final String coverUrl;
  final String videoUrl; // m3u8
  final int duration; // 秒
  final VideoAuthor author;
  final int categoryId;
  final int viewCount;
  final int likeCount;
  final int commentCount;
  final int favoriteCount;
  final List<String> tags;
  final bool isLiked;
  final bool isFavorited;
  final String description;

  /// 作品状态（仅「我的作品」接口返回）：-1 未提供；0转码中 1待审核 2已发布 3拒绝 4下架 5转码失败
  final int status;
  final String statusText;
  final String rejectReason;

  /// 拷贝更新（点赞/收藏乐观更新用）
  VideoItem copyWith({
    bool? isLiked,
    bool? isFavorited,
    int? likeCount,
    int? favoriteCount,
    int? commentCount,
  }) =>
      VideoItem(
        videoId: videoId,
        title: title,
        coverUrl: coverUrl,
        videoUrl: videoUrl,
        duration: duration,
        author: author,
        categoryId: categoryId,
        viewCount: viewCount,
        likeCount: likeCount ?? this.likeCount,
        commentCount: commentCount ?? this.commentCount,
        favoriteCount: favoriteCount ?? this.favoriteCount,
        tags: tags,
        isLiked: isLiked ?? this.isLiked,
        isFavorited: isFavorited ?? this.isFavorited,
        description: description,
        status: status,
        statusText: statusText,
        rejectReason: rejectReason,
      );

  factory VideoItem.fromJson(Map<String, dynamic> json) => VideoItem(
        videoId: json['video_id'] as int,
        title: (json['title'] as String?) ?? '',
        coverUrl: (json['cover_url'] as String?) ?? '',
        videoUrl: (json['video_url'] as String?) ?? '',
        duration: (json['duration'] as num?)?.toInt() ?? 0,
        categoryId: (json['category_id'] as num?)?.toInt() ?? 0,
        author: VideoAuthor.fromJson(
          (json['author'] as Map<String, dynamic>?) ?? const {},
        ),
        viewCount: (json['view_count'] as num?)?.toInt() ?? 0,
        likeCount: (json['like_count'] as num?)?.toInt() ?? 0,
        commentCount: (json['comment_count'] as num?)?.toInt() ?? 0,
        favoriteCount: (json['favorite_count'] as num?)?.toInt() ?? 0,
        tags: ((json['tags'] as List?) ?? const [])
            .map((e) => e.toString())
            .toList(),
        isLiked: (json['is_liked'] as bool?) ?? false,
        isFavorited: (json['is_favorited'] as bool?) ?? false,
        description: (json['description'] as String?) ?? '',
        status: (json['status'] as num?)?.toInt() ?? -1,
        statusText: (json['status_text'] as String?) ?? '',
        rejectReason: (json['reject_reason'] as String?) ?? '',
      );
}

/// 作者简要信息
class VideoAuthor {
  VideoAuthor({
    required this.userId,
    this.nickname = '',
    this.avatarUrl = '',
  });

  final int userId;
  final String nickname;
  final String avatarUrl;

  factory VideoAuthor.fromJson(Map<String, dynamic> json) => VideoAuthor(
        userId: (json['user_id'] as num?)?.toInt() ?? 0,
        nickname: (json['nickname'] as String?) ?? '',
        avatarUrl: (json['avatar_url'] as String?) ?? '',
      );
}