nj/app/lib/data/repositories/class_repository.dart

// 班级仓库 — 通过 API 客户端管理班级、主题、评语

import '../models/school_class.dart';
import '../remote/api_client.dart';

/// 班级成员数据
class ClassMemberDto {
  final String userId;
  final String role;
  final String? nickname;
  final DateTime joinedAt;

  const ClassMemberDto({
    required this.userId,
    required this.role,
    this.nickname,
    required this.joinedAt,
  });

  factory ClassMemberDto.fromJson(Map<String, dynamic> json) => ClassMemberDto(
        userId: json['user_id'] as String,
        role: json['role'] as String,
        nickname: json['nickname'] as String?,
        joinedAt: DateTime.parse(json['joined_at'] as String),
      );
}

/// 主题布置数据
class TopicDto {
  final String id;
  final String classId;
  final String teacherId;
  final String title;
  final String? description;
  final DateTime? dueDate;
  final bool isActive;

  const TopicDto({
    required this.id,
    required this.classId,
    required this.teacherId,
    required this.title,
    this.description,
    this.dueDate,
    this.isActive = true,
  });

  factory TopicDto.fromJson(Map<String, dynamic> json) => TopicDto(
        id: json['id'] as String,
        classId: json['class_id'] as String,
        teacherId: json['teacher_id'] as String,
        title: json['title'] as String,
        description: json['description'] as String?,
        dueDate: json['due_date'] != null
            ? DateTime.parse(json['due_date'] as String)
            : null,
        isActive: (json['is_active'] as bool?) ?? true,
      );
}

/// 评语数据
class CommentDto {
  final String id;
  final String journalId;
  final String authorId;
  final String content;
  final DateTime createdAt;

  const CommentDto({
    required this.id,
    required this.journalId,
    required this.authorId,
    required this.content,
    required this.createdAt,
  });

  factory CommentDto.fromJson(Map<String, dynamic> json) => CommentDto(
        id: json['id'] as String,
        journalId: json['journal_id'] as String,
        authorId: json['author_id'] as String,
        content: json['content'] as String,
        createdAt: DateTime.parse(json['created_at'] as String),
      );
}

/// 班级仓库 — 班级/主题/评语的 API 操作
class ClassRepository {
  final ApiClient _api;

  ClassRepository({required ApiClient api}) : _api = api;

  // ===== 班级 =====

  /// 获取我加入的班级列表
  Future<List<SchoolClass>> getMyClasses() async {
    final response = await _api.get('/diary/classes');
    final body = response.data as Map<String, dynamic>;
    final items = body['data'] as List? ?? [];
    return items
        .map((json) => SchoolClass.fromJson(json as Map<String, dynamic>))
        .toList();
  }

  /// 创建班级（老师）
  Future<SchoolClass> createClass({
    required String name,
    String? schoolName,
  }) async {
    final response = await _api.post('/diary/classes', data: {
      'name': name,
      if (schoolName != null) 'school_name': schoolName,
    });
    final body = response.data as Map<String, dynamic>;
    return SchoolClass.fromJson(body['data'] as Map<String, dynamic>);
  }

  /// 加入班级（通过班级码）
  Future<SchoolClass> joinClass(String classCode, {String? nickname}) async {
    final response = await _api.post('/diary/classes/join', data: {
      'class_code': classCode,
      if (nickname != null) 'nickname': nickname,
    });
    final body = response.data as Map<String, dynamic>;
    return SchoolClass.fromJson(body['data'] as Map<String, dynamic>);
  }

  /// 获取班级详情
  Future<SchoolClass> getClass(String classId) async {
    final response = await _api.get('/diary/classes/$classId');
    final body = response.data as Map<String, dynamic>;
    return SchoolClass.fromJson(body['data'] as Map<String, dynamic>);
  }

  /// 获取班级成员列表
  Future<List<ClassMemberDto>> getMembers(String classId) async {
    final response = await _api.get('/diary/classes/$classId/members');
    final body = response.data as Map<String, dynamic>;
    final items = body['data'] as List? ?? [];
    return items
        .map((json) => ClassMemberDto.fromJson(json as Map<String, dynamic>))
        .toList();
  }

  // ===== 主题 =====

  /// 获取班级主题列表
  Future<List<TopicDto>> getTopics(String classId) async {
    final response = await _api.get('/diary/classes/$classId/topics');
    final body = response.data as Map<String, dynamic>;
    final items = body['data'] as List? ?? [];
    return items
        .map((json) => TopicDto.fromJson(json as Map<String, dynamic>))
        .toList();
  }

  /// 布置主题（老师）
  Future<TopicDto> assignTopic({
    required String classId,
    required String title,
    String? description,
    DateTime? dueDate,
  }) async {
    final response = await _api.post('/diary/classes/$classId/topics', data: {
      'title': title,
      if (description != null) 'description': description,
      if (dueDate != null) 'due_date': dueDate.toIso8601String(),
    });
    final body = response.data as Map<String, dynamic>;
    return TopicDto.fromJson(body['data'] as Map<String, dynamic>);
  }

  // ===== 评语 =====

  /// 获取日记评语列表
  Future<List<CommentDto>> getComments(String journalId) async {
    final response = await _api.get('/diary/journals/$journalId/comments');
    final body = response.data as Map<String, dynamic>;
    final items = body['data'] as List? ?? [];
    return items
        .map((json) => CommentDto.fromJson(json as Map<String, dynamic>))
        .toList();
  }

  /// 添加评语（老师点评学生日记）
  Future<CommentDto> createComment({
    required String journalId,
    required String content,
  }) async {
    final response = await _api.post(
      '/diary/journals/$journalId/comments',
      data: {'content': content},
    );
    final body = response.data as Map<String, dynamic>;
    return CommentDto.fromJson(body['data'] as Map<String, dynamic>);
  }

  /// 删除评语
  Future<void> deleteComment(String commentId) async {
    await _api.delete('/diary/comments/$commentId');
  }
}