/// ============================================================
/// 【exam 模块模型】我的考试 —— 对标 Vue3 端 api/exam/type.ts
///
///   ExamDto          —— 单条考试记录
///   ExamSubjectTab   —— 考试科目筛选 Tab
///   ExamResponse     —— 考试列表分页响应
///
/// 序列化：手动 fromJson，与项目其他模块风格一致，不依赖 build_runner。
///
/// ⚠ 注意：后端返回的 id 字段类型不统一（数字 or 字符串），
/// 所有数值字段统一用 _asInt() 做兼容解析，避免类型转换异常。
/// ============================================================
library;

int? _optInt(dynamic v) {
  if (v == null) return null;
  if (v is int) return v;
  if (v is double) return v.toInt();
  final s = v.toString();
  final n = int.tryParse(s);
  if (n != null) return n;
  return double.tryParse(s)?.toInt();
}

int _asInt(dynamic v, [int fallback = 0]) => _optInt(v) ?? fallback;

/// 单条考试记录
class ExamDto {
  const ExamDto({
    this.id = 0,
    this.taskId = 0,
    this.taskName = '',
    this.baseSubjectId = 0,
    this.baseSubjectName = '',
    this.startTime = '',
    this.endTime = '',
    this.totalScore = 0,
    this.userScore = 0,
  });

  final int id;
  final int taskId;
  final String taskName;
  final int baseSubjectId;
  final String baseSubjectName;
  final String startTime;
  final String endTime;
  final int totalScore;
  final int userScore;

  factory ExamDto.fromJson(Map<String, dynamic> json) {
    return ExamDto(
      id: _asInt(json['id']),
      taskId: _asInt(json['taskId']),
      taskName: (json['taskName'] as String?) ?? '',
      baseSubjectId: _asInt(json['baseSubjectId']),
      baseSubjectName: (json['baseSubjectName'] as String?) ?? '',
      startTime: (json['startTime'] as String?) ?? '',
      endTime: (json['endTime'] as String?) ?? '',
      totalScore: _asInt(json['totalScore']),
      userScore: _asInt(json['userScore']),
    );
  }
}

/// 考试科目筛选 Tab
class ExamSubjectTab {
  const ExamSubjectTab({this.id, this.name = ''});

  /// 为 null 表示"全部"
  final int? id;
  final String name;

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

/// 考试列表分页响应
class ExamResponse {
  const ExamResponse({
    this.data = const [],
    this.total = 0,
    this.pageIndex = 1,
    this.pageSize = 10,
  });

  final List<ExamDto> data;
  final int total;
  final int pageIndex;
  final int pageSize;

  factory ExamResponse.fromJson(Map<String, dynamic> json) {
    final payload = (json['data'] as Map<String, dynamic>?) ?? json;
    final list = (payload['data'] as List<dynamic>? ?? const [])
        .whereType<Map<String, dynamic>>()
        .map(ExamDto.fromJson)
        .toList();
    return ExamResponse(
      data: list,
      total: (payload['total'] as num?)?.toInt() ?? list.length,
      pageIndex: (payload['pageIndex'] as num?)?.toInt() ?? 1,
      pageSize: (payload['pageSize'] as num?)?.toInt() ?? 10,
    );
  }
}