// SearchBloc 单元测试
//
// 覆盖：关键词搜索、标签搜索、心情筛选、搜索历史、清除搜索、tab 切换
// 使用 mocktail mock 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/repositories/journal_repository.dart';
import 'package:nuanji_app/data/models/journal_entry.dart';
import 'package:nuanji_app/features/search/bloc/search_bloc.dart';

// ===== Mock =====

class MockJournalRepository extends Mock implements JournalRepository {}

// ===== 测试数据工厂 =====

JournalEntry _makeJournal({
  String id = 'j-1',
  String title = '今天的心情日记',
  Mood mood = Mood.happy,
  String? contentExcerpt,
  List<String> tags = const [],
}) {
  return JournalEntry(
    id: id,
    authorId: 'user-1',
    title: title,
    date: DateTime(2026, 6, 1),
    mood: mood,
    contentExcerpt: contentExcerpt,
    tags: tags,
    createdAt: DateTime(2026, 6, 1),
    updatedAt: DateTime(2026, 6, 1),
  );
}

void main() {
  late MockJournalRepository mockJournalRepo;
  late SearchBloc bloc;

  setUp(() {
    mockJournalRepo = MockJournalRepository();
    bloc = SearchBloc(journalRepository: mockJournalRepo);
  });

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

  /// 辅助：dispatch 并等待处理完成
  Future<SearchState> dispatch(SearchEvent event) async {
    bloc.add(event);
    await Future<void>.delayed(const Duration(milliseconds: 50));
    return bloc.state;
  }

  // ===== 关键词搜索 =====

  group('SearchByKeyword', () {
    test('空关键词不触发搜索，返回空结果', () async {
      final state = await dispatch(const SearchByKeyword(''));
      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).results, isEmpty);
    });

    test('纯空格关键词视为空', () async {
      final state = await dispatch(const SearchByKeyword('   '));
      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).results, isEmpty);
    });

    test('匹配标题中的关键词', () async {
      final journals = [
        _makeJournal(id: 'j1', title: '今天的心情日记'),
        _makeJournal(id: 'j2', title: '周末旅行记'),
        _makeJournal(id: 'j3', title: '读后感'),
      ];
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => journals);

      final state = await dispatch(const SearchByKeyword('心情'));

      expect(state, isA<SearchLoaded>());
      final loaded = state as SearchLoaded;
      expect(loaded.results.length, 1);
      expect(loaded.results.first.id, 'j1');
      expect(loaded.activeKeyword, '心情');
    });

    test('匹配内容摘要中的关键词', () async {
      final journals = [
        _makeJournal(id: 'j1', title: '日记', contentExcerpt: '今天心情很好，阳光明媚'),
        _makeJournal(id: 'j2', title: '随笔', contentExcerpt: '天气阴沉'),
      ];
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => journals);

      final state = await dispatch(const SearchByKeyword('阳光'));

      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).results.length, 1);
      expect((state as SearchLoaded).results.first.id, 'j1');
    });

    test('匹配标签中的关键词', () async {
      final journals = [
        _makeJournal(id: 'j1', tags: ['旅行', '周末']),
        _makeJournal(id: 'j2', tags: ['学习']),
      ];
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => journals);

      final state = await dispatch(const SearchByKeyword('旅行'));

      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).results.length, 1);
    });

    test('大小写不敏感搜索', () async {
      final journals = [
        _makeJournal(id: 'j1', title: 'Happy Day'),
        _makeJournal(id: 'j2', title: 'happy mood'),
      ];
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => journals);

      final state = await dispatch(const SearchByKeyword('HAPPY'));

      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).results.length, 2);
    });

    test('搜索失败返回 SearchError', () async {
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenThrow(Exception('网络错误'));

      final state = await dispatch(const SearchByKeyword('测试'));

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

    test('搜索历史记录', () async {
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => []);

      await dispatch(const SearchByKeyword('关键词A'));
      await dispatch(const SearchByKeyword('关键词B'));

      final state = await dispatch(const SearchByKeyword(''));
      final loaded = state as SearchLoaded;
      expect(loaded.searchHistory, ['关键词B', '关键词A']);
    });

    test('搜索历史去重', () async {
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => []);

      await dispatch(const SearchByKeyword('重复'));
      await dispatch(const SearchByKeyword('其他'));
      await dispatch(const SearchByKeyword('重复'));

      final state = await dispatch(const SearchByKeyword(''));
      final loaded = state as SearchLoaded;
      expect(loaded.searchHistory, ['重复', '其他']);
    });
  });

  // ===== 心情筛选 =====

  group('SearchByMood', () {
    test('null mood 返回空结果', () async {
      final state = await dispatch(const SearchByMood(null));
      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).results, isEmpty);
      expect((state as SearchLoaded).activeMood, isNull);
    });

    test('按心情筛选日记', () async {
      final journals = [
        _makeJournal(id: 'j1', mood: Mood.happy),
        _makeJournal(id: 'j2', mood: Mood.happy),
        _makeJournal(id: 'j3', mood: Mood.sad),
      ];
      when(() => mockJournalRepo.getJournals(mood: 'happy', page: 1, pageSize: 50))
          .thenAnswer((_) async => journals.where((j) => j.mood == Mood.happy).toList());

      final state = await dispatch(const SearchByMood(Mood.happy));

      expect(state, isA<SearchLoaded>());
      final loaded = state as SearchLoaded;
      expect(loaded.results.length, 2);
      expect(loaded.activeMood, 'happy');
    });

    test('心情筛选失败返回 SearchError', () async {
      when(() => mockJournalRepo.getJournals(mood: 'happy', page: 1, pageSize: 50))
          .thenThrow(Exception('网络错误'));

      final state = await dispatch(const SearchByMood(Mood.happy));

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

  // ===== 标签搜索 =====

  group('SearchByTag', () {
    test('按标签筛选日记', () async {
      final journals = [
        _makeJournal(id: 'j1', tags: ['旅行', '周末']),
      ];
      when(() => mockJournalRepo.getJournals(tag: '旅行', page: 1, pageSize: 50))
          .thenAnswer((_) async => journals);

      final state = await dispatch(const SearchByTag('旅行'));

      expect(state, isA<SearchLoaded>());
      final loaded = state as SearchLoaded;
      expect(loaded.results.length, 1);
      expect(loaded.activeTag, '旅行');
      expect(loaded.searchHistory, contains('旅行'));
    });

    test('标签搜索失败返回 SearchError', () async {
      when(() => mockJournalRepo.getJournals(tag: '不存在', page: 1, pageSize: 50))
          .thenThrow(Exception('网络错误'));

      final state = await dispatch(const SearchByTag('不存在'));

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

  // ===== 清除搜索 =====

  group('SearchClear', () {
    test('清除搜索返回空结果', () async {
      // 先执行一次搜索
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => [_makeJournal()]);
      await dispatch(const SearchByKeyword('测试'));

      // 清除
      final state = await dispatch(const SearchClear());

      expect(state, isA<SearchLoaded>());
      final loaded = state as SearchLoaded;
      expect(loaded.results, isEmpty);
      expect(loaded.activeKeyword, isNull);
      expect(loaded.activeMood, isNull);
      expect(loaded.activeTag, isNull);
    });
  });

  // ===== Tab 切换 =====

  group('SearchTabChanged', () {
    test('切换 tab 更新 activeTab', () async {
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => []);
      await dispatch(const SearchByKeyword('测试'));

      final state = await dispatch(const SearchTabChanged(SearchResultTab.journal));

      expect(state, isA<SearchLoaded>());
      expect((state as SearchLoaded).activeTab, SearchResultTab.journal);
    });

    test('非 SearchLoaded 状态下切换 tab 无效', () async {
      // 初始状态 SearchInitial，不响应 tab 切换
      final state = await dispatch(const SearchTabChanged(SearchResultTab.tag));
      expect(state, isA<SearchInitial>());
    });
  });

  // ===== hasActiveFilter =====

  group('SearchLoaded.hasActiveFilter', () {
    test('无筛选条件时 hasActiveFilter 为 false', () async {
      final state = await dispatch(const SearchClear());
      expect((state as SearchLoaded).hasActiveFilter, isFalse);
    });

    test('有关键词时 hasActiveFilter 为 true', () async {
      when(() => mockJournalRepo.getJournals(page: 1, pageSize: 200))
          .thenAnswer((_) async => []);
      final state = await dispatch(const SearchByKeyword('测试'));
      expect((state as SearchLoaded).hasActiveFilter, isTrue);
    });
  });
}