/// 评论模型（《03-接口文档》6.3/6.4/6.5，对应服务端 interaction_service 输出）
class CommentItem {
  CommentItem({
    required this.commentId,
    required this.userId,
    this.nickname = '',
    this.avatarUrl = '',
    this.content = '',
    this.likeCount = 0,
    this.replyCount = 0,
    this.createdAt = '',
  });

  final int commentId;
  final int userId;
  final String nickname;
  final String avatarUrl;
  final String content;
  final int likeCount;

  /// 一级评论的回复数（二级回复列表项恒为 0）
  final int replyCount;
  final String createdAt;

  CommentItem copyWith({int? replyCount}) => CommentItem(
        commentId: commentId,
        userId: userId,
        nickname: nickname,
        avatarUrl: avatarUrl,
        content: content,
        likeCount: likeCount,
        replyCount: replyCount ?? this.replyCount,
        createdAt: createdAt,
      );

  factory CommentItem.fromJson(Map<String, dynamic> json) {
    final user = (json['user'] as Map<String, dynamic>?) ?? const {};
    return CommentItem(
      commentId: (json['comment_id'] as num?)?.toInt() ?? 0,
      userId: (user['user_id'] as num?)?.toInt() ?? 0,
      nickname: (user['nickname'] as String?) ?? '',
      avatarUrl: (user['avatar_url'] as String?) ?? '',
      content: (json['content'] as String?) ?? '',
      likeCount: (json['like_count'] as num?)?.toInt() ?? 0,
      replyCount: (json['reply_count'] as num?)?.toInt() ?? 0,
      createdAt: (json['created_at'] as String?) ?? '',
    );
  }
}

/// 评论分页（普通 page/page_size 分页，《03-接口文档》1.4）
class CommentListPage {
  CommentListPage({required this.total, required this.items});

  final int total;
  final List<CommentItem> items;

  factory CommentListPage.fromJson(Map<String, dynamic> json) =>
      CommentListPage(
        total: (json['total'] as num?)?.toInt() ?? 0,
        items: ((json['list'] as List?) ?? const [])
            .whereType<Map<String, dynamic>>()
            .map(CommentItem.fromJson)
            .toList(),
      );
}

/// 评论积分奖励进度（发表/删除评论响应中的 reward_progress）
class RewardProgress {
  RewardProgress({
    required this.current,
    required this.target,
    this.rewardedThisTime = false,
    this.rewardPoints = 0,
  });

  /// 当前进度（满 target 自动发奖并清零）
  final int current;
  final int target;

  /// 本次是否触发发奖
  final bool rewardedThisTime;

  /// 本次发放积分数（未发奖为 0）
  final int rewardPoints;

  factory RewardProgress.fromJson(Map<String, dynamic> json) => RewardProgress(
        current: (json['current'] as num?)?.toInt() ?? 0,
        target: (json['target'] as num?)?.toInt() ?? 10,
        rewardedThisTime: (json['rewarded_this_time'] as bool?) ?? false,
        rewardPoints: (json['reward_points'] as num?)?.toInt() ?? 0,
      );
}

/// 发表评论响应（《03-接口文档》6.4）
class CommentCreateResult {
  CommentCreateResult({required this.commentId, required this.rewardProgress});

  final int commentId;
  final RewardProgress rewardProgress;

  factory CommentCreateResult.fromJson(Map<String, dynamic> json) =>
      CommentCreateResult(
        commentId: (json['comment_id'] as num?)?.toInt() ?? 0,
        rewardProgress: RewardProgress.fromJson(
          (json['reward_progress'] as Map<String, dynamic>?) ?? const {},
        ),
      );
}