// CalendarBloc 单元测试
//
// 覆盖：月份切换加载、日期选择、视图模式切换、状态保持
// 使用 InMemoryJournalRepository 作为测试替身

import 'package:flutter_test/flutter_test.dart';
import 'package:nuanji_app/data/models/journal_element.dart';
import 'package:nuanji_app/data/models/journal_entry.dart';
import 'package:nuanji_app/data/repositories/journal_repository.dart';
import 'package:nuanji_app/features/calendar/bloc/calendar_bloc.dart';

void main() {
  group('CalendarBloc', () {
    late CalendarBloc bloc;
    late InMemoryJournalRepository repo;

    setUp(() {
      repo = InMemoryJournalRepository();
      bloc = CalendarBloc(journalRepository: repo);
    });

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

    // ===== 辅助 =====

    /// 收集事件触发后的最终状态
    Future<CalendarState> dispatch(CalendarEvent event) async {
      bloc.add(event);
      await Future<void>.delayed(const Duration(milliseconds: 50));
      return bloc.state;
    }

    /// 创建测试日记条目
    ///
    /// 日期放在月份中间（15 号），避免 InMemoryJournalRepository
    /// 使用 isAfter/isBefore（严格大于/小于）时的边界问题。
    JournalEntry _makeEntry({required String id, required DateTime date}) {
      return JournalEntry(
        id: id,
        authorId: 'user-1',
        title: '日记',
        date: date,
        createdAt: date,
        updatedAt: date,
      );
    }

    // ===== 初始状态 =====

    test('初始状态为 CalendarInitial', () {
      expect(bloc.state, isA<CalendarInitial>());
    });

    // ===== 月份切换 =====

    test('CalendarMonthChanged 成功加载日记 → journalsByDate 包含数据', () async {
      // 在 6 月 15 日创建日记
      final june15 = DateTime(2026, 6, 15);
      await repo.createJournal(_makeEntry(id: 'j-1', date: june15));

      final state = await dispatch(CalendarMonthChanged(DateTime(2026, 6, 1)));

      expect(state, isA<CalendarLoaded>());
      final loaded = state as CalendarLoaded;
      expect(loaded.focusedMonth, DateTime(2026, 6, 1));
      expect(loaded.isLoading, isFalse);
      expect(loaded.journalsByDate, isNotEmpty);

      final key = DateTime(2026, 6, 15);
      expect(loaded.journalsByDate[key], isNotNull);
      expect(loaded.journalsByDate[key]!.length, 1);
      expect(loaded.journalsByDate[key]!.first.id, 'j-1');
    });

    test('CalendarMonthChanged 失败 → isLoading: false，保留旧数据', () async {
      // 使用一个会抛异常的仓库替身
      final failingRepo = _FailingJournalRepository();
      final failingBloc = CalendarBloc(journalRepository: failingRepo);

      // 先加载一次成功数据（这里直接 emit 一个 loaded 状态）
      failingBloc.add(CalendarMonthChanged(DateTime(2026, 6, 1)));
      await Future<void>.delayed(const Duration(milliseconds: 50));

      // 此时状态应为 CalendarLoaded（isLoading: false，因为加载失败）
      expect(failingBloc.state, isA<CalendarLoaded>());
      final loaded = failingBloc.state as CalendarLoaded;
      expect(loaded.isLoading, isFalse);
      expect(loaded.journalsByDate, isEmpty);

      await failingBloc.close();
    });

    test('CalendarMonthChanged 保留上一个 viewMode', () async {
      // 先加载月份，进入 CalendarLoaded 状态
      await dispatch(CalendarMonthChanged(DateTime(2026, 6, 1)));
      expect(bloc.state, isA<CalendarLoaded>());

      // 切换视图模式为 week
      await dispatch(CalendarViewModeChanged(CalendarViewMode.week));
      expect((bloc.state as CalendarLoaded).viewMode, CalendarViewMode.week);

      // 再切换月份，viewMode 应该保留为 week
      final state = await dispatch(CalendarMonthChanged(DateTime(2026, 7, 1)));
      final loaded = state as CalendarLoaded;
      expect(loaded.viewMode, CalendarViewMode.week);
      expect(loaded.focusedMonth, DateTime(2026, 7, 1));
    });

    // ===== 日期选择 =====

    test('CalendarDaySelected 有日记 → selectedDayJournals 不为空', () async {
      final june15 = DateTime(2026, 6, 15);
      await repo.createJournal(_makeEntry(id: 'j-1', date: june15));

      // 先加载月份
      await dispatch(CalendarMonthChanged(DateTime(2026, 6, 1)));

      // 选择 6 月 15 日
      final state = await dispatch(CalendarDaySelected(june15));
      final loaded = state as CalendarLoaded;
      expect(loaded.selectedDay, june15);
      expect(loaded.selectedDayJournals, isNotEmpty);
      expect(loaded.selectedDayJournals.length, 1);
      expect(loaded.selectedDayJournals.first.id, 'j-1');
    });

    test('CalendarDaySelected 无日记 → selectedDayJournals 为空', () async {
      // 先加载月份（空数据）
      await dispatch(CalendarMonthChanged(DateTime(2026, 6, 1)));

      // 选择 6 月 10 日（无日记）
      final june10 = DateTime(2026, 6, 10);
      final state = await dispatch(CalendarDaySelected(june10));
      final loaded = state as CalendarLoaded;
      expect(loaded.selectedDay, june10);
      expect(loaded.selectedDayJournals, isEmpty);
    });

    test('CalendarDaySelected 在 CalendarInitial 状态不改变状态', () async {
      // 不先加载月份，初始状态为 CalendarInitial
      expect(bloc.state, isA<CalendarInitial>());

      final state = await dispatch(CalendarDaySelected(DateTime(2026, 6, 15)));
      // 状态应保持为 CalendarInitial
      expect(state, isA<CalendarInitial>());
    });

    // ===== 视图模式 =====

    test('CalendarViewModeChanged 更新 viewMode', () async {
      // 先进入 CalendarLoaded 状态
      await dispatch(CalendarMonthChanged(DateTime(2026, 6, 1)));

      final state = await dispatch(CalendarViewModeChanged(CalendarViewMode.timeline));
      final loaded = state as CalendarLoaded;
      expect(loaded.viewMode, CalendarViewMode.timeline);
    });

    test('CalendarViewModeChanged 在 CalendarInitial 状态不改变状态', () async {
      expect(bloc.state, isA<CalendarInitial>());

      final state = await dispatch(CalendarViewModeChanged(CalendarViewMode.week));
      // 状态应保持为 CalendarInitial
      expect(state, isA<CalendarInitial>());
    });

    // ===== 日期键归一化 =====

    test('CalendarMonthChanged 日期键归一化 — 同一天不同时间映射到同一个 key', () async {
      // 创建两篇日记，日期都是 6 月 15 日但时间不同
      final june15Morning = DateTime(2026, 6, 15, 8, 30);
      final june15Afternoon = DateTime(2026, 6, 15, 14, 45);
      await repo.createJournal(_makeEntry(id: 'j-1', date: june15Morning));
      await repo.createJournal(_makeEntry(id: 'j-2', date: june15Afternoon));

      final state = await dispatch(CalendarMonthChanged(DateTime(2026, 6, 1)));
      final loaded = state as CalendarLoaded;

      // 归一化后的 key 应为 DateTime(2026, 6, 15)
      final normalizedKey = DateTime(2026, 6, 15);
      expect(loaded.journalsByDate.containsKey(normalizedKey), isTrue);
      // 两篇日记都映射到同一个 key
      expect(loaded.journalsByDate[normalizedKey]!.length, 2);
      expect(
        loaded.journalsByDate[normalizedKey]!.map((j) => j.id).toList()
          ..sort(),
        ['j-1', 'j-2'],
      );
    });
  });
}

/// 加载日记时总是抛异常的仓库 — 用于测试错误路径
class _FailingJournalRepository implements JournalRepository {
  @override
  Future<List<JournalEntry>> getJournals({
    DateTime? dateFrom,
    DateTime? dateTo,
    int? page,
    int? pageSize,
    String? mood,
    String? tag,
  }) async {
    throw Exception('模拟网络错误');
  }

  @override
  Future<JournalEntry?> getJournal(String id) async => null;

  @override
  Future<JournalEntry> createJournal(JournalEntry entry) async => entry;

  @override
  Future<JournalEntry> updateJournal(JournalEntry entry) async => entry;

  @override
  Future<void> deleteJournal(String id) async {}

  @override
  Future<List<JournalElement>> getElements(String journalId) async => [];

  @override
  Future<JournalElement> addElement(JournalElement element) async => element;

  @override
  Future<JournalElement> updateElement(JournalElement element) async => element;

  @override
  Future<void> removeElement(String elementId) async {}
}