// ClassBloc 单元测试
//
// 覆盖：班级列表加载、选中详情、成员/日记墙/主题/评语加载、创建班级、加入班级、布置主题
// 使用 mocktail mock ClassRepository + JournalRepository

import 'package:flutter_test/flutter_test.dart';
import 'package:mocktail/mocktail.dart';
import 'package:nuanji_app/data/models/journal_entry.dart';
import 'package:nuanji_app/data/models/school_class.dart';
import 'package:nuanji_app/data/repositories/class_repository.dart';
import 'package:nuanji_app/data/repositories/journal_repository.dart';
import 'package:nuanji_app/features/class_/bloc/class_bloc.dart';

// ===== Mocks =====

class MockClassRepository extends Mock implements ClassRepository {}

class MockJournalRepository extends Mock implements JournalRepository {}

// ===== 测试数据工厂 =====

SchoolClass _makeClass({
  String id = 'class-1',
  String name = '三年级一班',
  String schoolName = '暖阳小学',
  String teacherId = 'teacher-1',
  String classCode = 'ABC123',
  int memberCount = 25,
}) {
  return SchoolClass(
    id: id,
    name: name,
    schoolName: schoolName,
    teacherId: teacherId,
    classCode: classCode,
    memberCount: memberCount,
    createdAt: DateTime(2026, 1, 1),
    updatedAt: DateTime(2026, 1, 1),
  );
}

JournalEntry _makeJournal({
  String id = 'j-1',
  String title = '今天的心情',
  Mood mood = Mood.happy,
  bool sharedToClass = true,
}) {
  return JournalEntry(
    id: id,
    authorId: 'user-1',
    title: title,
    date: DateTime(2026, 6, 1),
    mood: mood,
    createdAt: DateTime(2026, 6, 1),
    updatedAt: DateTime(2026, 6, 1),
    sharedToClass: sharedToClass,
  );
}

ClassMemberDto _makeMember({
  String userId = 'student-1',
  String role = 'student',
  String? nickname = '小明',
}) {
  return ClassMemberDto(
    userId: userId,
    role: role,
    nickname: nickname,
    joinedAt: DateTime(2026, 1, 15),
  );
}

TopicDto _makeTopic({
  String id = 'topic-1',
  String classId = 'class-1',
  String title = '我的暑假计划',
}) {
  return TopicDto(
    id: id,
    classId: classId,
    teacherId: 'teacher-1',
    title: title,
    isActive: true,
  );
}

CommentDto _makeComment({
  String id = 'comment-1',
  String journalId = 'j-1',
  String content = '写得很好！',
}) {
  return CommentDto(
    id: id,
    journalId: journalId,
    authorId: 'teacher-1',
    content: content,
    createdAt: DateTime(2026, 6, 2),
  );
}

void main() {
  late MockClassRepository mockClassRepo;
  late MockJournalRepository mockJournalRepo;
  late ClassBloc bloc;

  setUp(() {
    mockClassRepo = MockClassRepository();
    mockJournalRepo = MockJournalRepository();
    bloc = ClassBloc(
      classRepository: mockClassRepo,
      journalRepository: mockJournalRepo,
    );
  });

  tearDown(() {
    bloc.close();
  });

  // ===== 辅助：收集事件触发后的最终状态 =====

  Future<ClassState> dispatch(ClassEvent event) async {
    bloc.add(event);
    // 等待所有异步事件处理完毕
    await Future<void>.delayed(const Duration(milliseconds: 50));
    return bloc.state;
  }

  // ===== 班级列表 =====

  group('ClassLoadMyClasses', () {
    test('成功加载班级列表', () async {
      final classes = [_makeClass(id: 'c1'), _makeClass(id: 'c2', name: '三年级二班')];
      when(() => mockClassRepo.getMyClasses()).thenAnswer((_) async => classes);

      final state = await dispatch(const ClassLoadMyClasses());

      expect(state, isA<ClassListLoaded>());
      final loaded = state as ClassListLoaded;
      expect(loaded.classes.length, 2);
      expect(loaded.classes[0].id, 'c1');
      expect(loaded.classes[1].name, '三年级二班');
      expect(loaded.isLoading, false);
      expect(loaded.error, isNull);
    });

    test('加载失败返回空列表', () async {
      when(() => mockClassRepo.getMyClasses()).thenThrow(Exception('网络错误'));

      final state = await dispatch(const ClassLoadMyClasses());

      expect(state, isA<ClassListLoaded>());
      final loaded = state as ClassListLoaded;
      expect(loaded.classes, isEmpty);
      expect(loaded.isLoading, false);
    });

    test('加载中状态先触发', () async {
      when(() => mockClassRepo.getMyClasses()).thenAnswer((_) async {
        await Future<void>.delayed(const Duration(milliseconds: 100));
        return [_makeClass()];
      });

      bloc.add(const ClassLoadMyClasses());
      // 立即检查，应该在 loading 状态
      await Future<void>.delayed(const Duration(milliseconds: 10));
      // state 可能是 loading，也可能已完成，取决于调度
    });
  });

  // ===== 选中班级 =====

  group('ClassSelected', () {
    test('成功选中班级并触发子事件加载', () async {
      final classInfo = _makeClass();
      final members = [_makeMember()];
      final journals = [_makeJournal(sharedToClass: true)];
      final topics = [_makeTopic()];

      when(() => mockClassRepo.getClass('class-1')).thenAnswer((_) async => classInfo);
      when(() => mockJournalRepo.getJournals(classId: 'class-1')).thenAnswer((_) async => journals);
      when(() => mockClassRepo.getMembers('class-1')).thenAnswer((_) async => members);
      when(() => mockClassRepo.getTopics('class-1')).thenAnswer((_) async => topics);

      final state = await dispatch(const ClassSelected('class-1'));

      expect(state, isA<ClassDetailLoaded>());
      final detail = state as ClassDetailLoaded;
      expect(detail.classInfo.id, 'class-1');
      expect(detail.members.length, 1);
      expect(detail.topics.length, 1);
    });

    test('加载失败返回 ClassError', () async {
      when(() => mockClassRepo.getClass('class-1')).thenThrow(Exception('不存在'));

      final state = await dispatch(const ClassSelected('class-1'));

      expect(state, isA<ClassError>());
      expect((state as ClassError).message, contains('加载班级失败'));
    });
  });

  // ===== 成员加载 =====

  group('ClassLoadMembers', () {
    test('在 ClassDetailLoaded 状态下加载成员', () async {
      // 先进入 ClassDetailLoaded
      when(() => mockClassRepo.getClass('class-1')).thenAnswer((_) async => _makeClass());
      when(() => mockJournalRepo.getJournals(classId: 'class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getMembers('class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getTopics('class-1')).thenAnswer((_) async => []);

      await dispatch(const ClassSelected('class-1'));

      // 现在加载成员
      final members = [_makeMember(), _makeMember(userId: 'student-2', nickname: '小红')];
      when(() => mockClassRepo.getMembers('class-1')).thenAnswer((_) async => members);

      final state = await dispatch(const ClassLoadMembers('class-1'));

      expect(state, isA<ClassDetailLoaded>());
      final detail = state as ClassDetailLoaded;
      expect(detail.members.length, 2);
      expect(detail.members[0].nickname, '小明');
      expect(detail.members[1].nickname, '小红');
    });

    test('非 ClassDetailLoaded 状态下忽略', () async {
      // 初始状态 ClassInitial，直接加载成员应被忽略
      final state = await dispatch(const ClassLoadMembers('class-1'));

      expect(state, isA<ClassInitial>());
    });
  });

  // ===== 日记墙 =====

  group('ClassLoadDiaryWall', () {
    test('只包含 sharedToClass 为 true 的日记', () async {
      // 手动进入 ClassDetailLoaded 状态
      when(() => mockClassRepo.getClass('class-1')).thenAnswer((_) async => _makeClass());
      when(() => mockJournalRepo.getJournals(classId: 'class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getMembers('class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getTopics('class-1')).thenAnswer((_) async => []);
      await dispatch(const ClassSelected('class-1'));
      // 等待 ClassSelected 的子事件完成
      await Future<void>.delayed(const Duration(milliseconds: 150));
      // 此时应该已经在 ClassDetailLoaded 状态
      expect(bloc.state, isA<ClassDetailLoaded>());

      // 现在单独测试 ClassLoadDiaryWall 过滤逻辑
      final journals = [
        _makeJournal(id: 'j1', sharedToClass: true),
        _makeJournal(id: 'j2', sharedToClass: false),
        _makeJournal(id: 'j3', sharedToClass: true),
      ];
      when(() => mockJournalRepo.getJournals(classId: 'class-1')).thenAnswer((_) async => journals);

      final state = await dispatch(const ClassLoadDiaryWall('class-1'));

      expect(state, isA<ClassDetailLoaded>());
      final detail = state as ClassDetailLoaded;
      expect(detail.diaryWall.length, 2);
      expect(detail.diaryWall.every((j) => j.sharedToClass), isTrue);
    });
  });

  // ===== 创建班级 =====

  group('ClassCreate', () {
    test('成功创建班级并添加到列表', () async {
      // 先加载列表
      when(() => mockClassRepo.getMyClasses()).thenAnswer((_) async => [_makeClass(id: 'c1')]);
      await dispatch(const ClassLoadMyClasses());

      // 创建新班级
      final newClass = _makeClass(id: 'c2', name: '新班级');
      when(() => mockClassRepo.createClass(name: '新班级')).thenAnswer((_) async => newClass);

      final state = await dispatch(const ClassCreate(name: '新班级'));

      expect(state, isA<ClassListLoaded>());
      final loaded = state as ClassListLoaded;
      expect(loaded.classes.length, 2);
      expect(loaded.classes.last.id, 'c2');
    });

    test('创建失败设置 error', () async {
      when(() => mockClassRepo.getMyClasses()).thenAnswer((_) async => []);
      await dispatch(const ClassLoadMyClasses());

      when(() => mockClassRepo.createClass(name: '失败')).thenThrow(Exception('创建失败'));

      final state = await dispatch(const ClassCreate(name: '失败'));

      expect(state, isA<ClassListLoaded>());
      expect((state as ClassListLoaded).error, isNotNull);
    });
  });

  // ===== 加入班级 =====

  group('ClassJoin', () {
    test('加入成功后触发列表刷新', () async {
      when(() => mockClassRepo.joinClass('ABC123')).thenAnswer((_) async => _makeClass());
      when(() => mockClassRepo.getMyClasses()).thenAnswer((_) async => [_makeClass()]);

      await dispatch(const ClassJoin(classCode: 'ABC123'));

      // 应该触发 ClassLoadMyClasses，最终状态为 ClassListLoaded
      expect(bloc.state, isA<ClassListLoaded>());
      verify(() => mockClassRepo.joinClass('ABC123')).called(1);
      verify(() => mockClassRepo.getMyClasses()).called(1);
    });

    test('加入失败返回 ClassError', () async {
      when(() => mockClassRepo.joinClass('INVALID')).thenThrow(Exception('班级码错误'));

      final state = await dispatch(const ClassJoin(classCode: 'INVALID'));

      expect(state, isA<ClassError>());
      expect((state as ClassError).message, contains('加入班级失败'));
    });
  });

  // ===== 布置主题 =====

  group('TopicAssign', () {
    test('成功布置主题并添加到列表', () async {
      // 进入 ClassDetailLoaded
      when(() => mockClassRepo.getClass('class-1')).thenAnswer((_) async => _makeClass());
      when(() => mockJournalRepo.getJournals(classId: 'class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getMembers('class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getTopics('class-1')).thenAnswer((_) async => []);
      await dispatch(const ClassSelected('class-1'));

      final newTopic = _makeTopic(id: 'topic-2', title: '新主题');
      when(() => mockClassRepo.assignTopic(classId: 'class-1', title: '新主题'))
          .thenAnswer((_) async => newTopic);

      final state = await dispatch(const TopicAssign(classId: 'class-1', title: '新主题'));

      expect(state, isA<ClassDetailLoaded>());
      final detail = state as ClassDetailLoaded;
      expect(detail.topics.length, 1);
      expect(detail.topics.first.title, '新主题');
    });
  });

  // ===== 评语 =====

  group('ClassLoadComments', () {
    test('加载评语并设置 selectedJournalId', () async {
      // 进入 ClassDetailLoaded
      when(() => mockClassRepo.getClass('class-1')).thenAnswer((_) async => _makeClass());
      when(() => mockJournalRepo.getJournals(classId: 'class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getMembers('class-1')).thenAnswer((_) async => []);
      when(() => mockClassRepo.getTopics('class-1')).thenAnswer((_) async => []);
      await dispatch(const ClassSelected('class-1'));

      final comments = [_makeComment(), _makeComment(id: 'comment-2', content: '继续加油')];
      when(() => mockClassRepo.getComments('j-1')).thenAnswer((_) async => comments);

      final state = await dispatch(const ClassLoadComments('j-1'));

      expect(state, isA<ClassDetailLoaded>());
      final detail = state as ClassDetailLoaded;
      expect(detail.comments.length, 2);
      expect(detail.selectedJournalId, 'j-1');
    });
  });
}