// Author: fruit.com.cn

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/app.dart';
import 'package:fruitshorts/core/data/models/drama.dart';
import 'package:fruitshorts/core/data/models/page_result.dart';
import 'package:fruitshorts/core/data/models/watch_progress.dart';
import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
import 'package:fruitshorts/core/data/services/auth_controller.dart';
import 'package:fruitshorts/core/theme/app_colors.dart';
import 'package:fruitshorts/core/theme/app_dimens.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';

import '../support/fake_catalog.dart';
import '../support/fake_category.dart';
import '../support/fake_interaction_repositories.dart';
import '../support/widget_player.dart';

void main() {
  testWidgets('should_defer_watch_history_until_following_tab_is_opened', (
    tester,
  ) async {
    SharedPreferencesAsyncPlatform.instance =
        InMemorySharedPreferencesAsync.empty();
    final catalog = FakeCatalogRepository();
    final history = _IdentityWatchHistoryRepository(
      device: [_historyProgress('the-signal-demo', 'Device history')],
      account: const [],
    );
    await tester.pumpWidget(_app(catalog: catalog, history: history));
    await tester.pumpAndSettle();

    // 首页默认停在推荐 tab：追剧页在启动时还没被构建，不该提前拉观看历史。
    expect(history.recentCalls, 0);

    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    expect(history.recentCalls, greaterThan(0));
  });

  testWidgets('should_render_following_tabs_grid_and_edit_actions', (
    tester,
  ) async {
    _signIn();
    final catalog = FakeCatalogRepository();
    await tester.pumpWidget(
      _app(
        catalog: catalog,
        favorites: InMemoryFavoriteRepository(
          cards: catalog.dramas.take(1).toList(),
          saved: {catalog.dramas.first.id},
        ),
      ),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    expect(find.byKey(const Key('following-page')), findsOneWidget);
    expect(find.byKey(const Key('following-tab-favorites')), findsOneWidget);
    expect(find.byKey(const Key('following-tab-history')), findsOneWidget);
    expect(find.byKey(const Key('following-tab-reserve')), findsNothing);
    expect(find.byKey(const Key('following-favorites-grid')), findsOneWidget);
    expect(find.byKey(const Key('following-add-card')), findsOneWidget);
    expect(find.byType(CustomScrollView), findsWidgets);
    final tab = tester.widget<AnimatedDefaultTextStyle>(
      find.descendant(
        of: find.byKey(const Key('following-tab-favorites')),
        matching: find.byType(AnimatedDefaultTextStyle),
      ),
    );
    expect(tab.style.fontSize, AppDimens.followingSegmentFont);
    expect(tab.style.fontWeight, FontWeight.w400);
    expect(tab.style.color, AppColors.textPrimary);
    // 新版头部右上角是「Manage」文字按钮，不再是编辑图标。
    final manage = tester.widget<Text>(
      find.descendant(
        of: find.byKey(const Key('following-edit')),
        matching: find.byType(Text),
      ),
    );
    expect(manage.style?.fontSize, AppDimens.followingManageFont);
    expect(manage.style?.color, AppColors.textPrimary);
    final grid = tester.widget<SliverGrid>(
      find.descendant(
        of: find.byKey(const Key('following-favorites-grid')),
        matching: find.byType(SliverGrid),
      ),
    );
    final delegate =
        grid.gridDelegate as SliverGridDelegateWithFixedCrossAxisCount;
    expect(delegate.crossAxisCount, 3);
    expect(delegate.crossAxisSpacing, AppDimens.followingGridGap);
    expect(delegate.mainAxisSpacing, AppDimens.followingGridRowGap);
    expect(delegate.mainAxisExtent, greaterThan(0));
    final card = find.byKey(const Key('following-card-the-signal-demo'));
    final coverFinder = find.byKey(
      const Key('following-cover-the-signal-demo'),
    );
    final cover = tester.widget<AspectRatio>(coverFinder);
    expect(cover.aspectRatio, AppDimens.cardCoverAspectRatio);
    final coverClip = tester.widget<ClipRRect>(
      find.descendant(
        of: find.byKey(const Key('following-cover-the-signal-demo')),
        matching: find.byType(ClipRRect),
      ),
    );
    expect(
      coverClip.borderRadius,
      BorderRadius.circular(AppDimens.coverRadius),
    );
    final titleFinder = find.descendant(
      of: card,
      matching: find.text('The Signal'),
    );
    final title = tester.widget<Text>(titleFinder);
    expect(title.style?.fontSize, AppDimens.followingCardTitleFontNew);
    expect(title.style?.fontWeight, FontWeight.w400);
    expect(title.style?.height, AppDimens.cardTitleLineHeight);
    final views = tester.widget<Text>(
      find.descendant(
        of: find.byKey(const Key('following-views-the-signal-demo')),
        matching: find.byType(Text),
      ),
    );
    expect(views.style?.fontSize, AppDimens.cardPlayCountFont);
    expect(views.style?.fontWeight, FontWeight.w400);
    expect(
      find.descendant(
        of: coverFinder,
        matching: find.byKey(const Key('following-views-the-signal-demo')),
      ),
      findsOneWidget,
    );
    expect(views.style?.color, AppColors.textPrimary);
    expect(
      find.descendant(
        of: find.byKey(const Key('following-views-the-signal-demo')),
        matching: find.byIcon(Icons.local_fire_department_rounded),
      ),
      findsOneWidget,
    );
    expect(
      tester.getTopLeft(titleFinder).dx,
      tester.getTopLeft(coverFinder).dx,
    );
    expect(
      tester.getTopLeft(card).dx,
      lessThan(
        tester.getTopLeft(find.byKey(const Key('following-add-card'))).dx,
      ),
    );

    await tester.tap(find.byKey(const Key('following-edit')));
    await tester.pumpAndSettle();
    expect(
      find.byKey(const Key('following-select-the-signal-demo')),
      findsOneWidget,
    );
    expect(find.byKey(const Key('following-cancel-follow')), findsOneWidget);

    await tester.tap(find.byKey(const Key('following-card-the-signal-demo')));
    await tester.pumpAndSettle();
    // 新版取消追剧不再弹二次确认框，点「取消追剧」即直接移除。
    await tester.tap(find.byKey(const Key('following-cancel-follow')));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const Key('following-select-the-signal-demo')),
      findsNothing,
    );
    expect(find.byKey(const Key('following-edit-bar')), findsNothing);
    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsNothing,
    );

    await tester.tap(find.byKey(const Key('following-tab-history')));
    await tester.pumpAndSettle();
    expect(find.byKey(const Key('following-history-empty')), findsOneWidget);
    _drainOverflows(tester);
  });

  testWidgets('should_unfollow_every_selected_drama_when_edit_confirms', (
    tester,
  ) async {
    SharedPreferencesAsyncPlatform.instance =
        InMemorySharedPreferencesAsync.empty();
    final catalog = FakeCatalogRepository();
    final dramas = catalog.dramas.take(2).toList();
    final favorites = InMemoryFavoriteRepository(
      cards: dramas,
      saved: dramas.map((drama) => drama.id).toSet(),
    );
    await tester.pumpWidget(_app(catalog: catalog, favorites: favorites));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('following-edit')));
    await tester.pumpAndSettle();

    await tester.tap(find.byKey(const Key('following-select-all')));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('following-cancel-follow')));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsNothing,
    );
    expect(
      find.byKey(const Key('following-card-city-lights-demo')),
      findsNothing,
    );
    expect(find.byKey(const Key('following-edit-bar')), findsNothing);
    expect(favorites.removeManyCalls, 1);
    _drainOverflows(tester);
  });

  testWidgets('should_show_device_favorites_and_history_when_signed_out', (
    tester,
  ) async {
    SharedPreferencesAsyncPlatform.instance =
        InMemorySharedPreferencesAsync.empty();
    final catalog = FakeCatalogRepository();
    await tester.pumpWidget(
      _app(
        catalog: catalog,
        favorites: InMemoryFavoriteRepository(
          cards: catalog.dramas.take(1).toList(),
          saved: {catalog.dramas.first.id},
        ),
        history: InMemoryWatchHistoryRepository(
          seed: [
            WatchProgress(
              dramaId: 'the-signal-demo',
              episodeId: 'the-signal-demo-3',
              dramaTitle: 'Device history',
              episodeNumber: 3,
              position: const Duration(seconds: 25),
              duration: const Duration(seconds: 100),
            ),
          ],
        ),
      ),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    expect(find.byKey(const Key('auth-gate-panel')), findsNothing);
    expect(find.byKey(const Key('following-favorites-grid')), findsOneWidget);
    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsOneWidget,
    );

    await tester.tap(find.byKey(const Key('following-tab-history')));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const Key('following-history-card-the-signal-demo')),
      findsOneWidget,
    );
    expect(find.text('Device history'), findsOneWidget);
    _drainOverflows(tester);
  });

  testWidgets('should_reload_identity_data_after_login_and_logout', (
    tester,
  ) async {
    SharedPreferencesAsyncPlatform.instance =
        InMemorySharedPreferencesAsync.empty();
    final catalog = FakeCatalogRepository();
    final favorites = _IdentityFavoriteRepository(
      device: [catalog.dramas[0]],
      account: [catalog.dramas[1]],
    );
    final history = _IdentityWatchHistoryRepository(
      device: [_historyProgress('the-signal-demo', 'Device history')],
      account: [_historyProgress('city-lights-demo', 'Account history')],
    );
    await tester.pumpWidget(
      _app(catalog: catalog, favorites: favorites, history: history),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsOneWidget,
    );
    final initialFavoriteCalls = favorites.pageCalls;
    final initialHistoryCalls = history.recentCalls;
    final auth = Provider.of<AuthController>(
      tester.element(find.byKey(const Key('following-page'))),
      listen: false,
    );
    final preferences = SharedPreferencesAsync();

    favorites.scope = 'account';
    history.scope = 'account';
    await _setSignedIn(preferences);
    await auth.load();
    await tester.pumpAndSettle();

    expect(auth.isSignedIn, isTrue);
    expect(favorites.pageCalls, greaterThan(initialFavoriteCalls));
    expect(history.recentCalls, greaterThan(initialHistoryCalls));
    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsNothing,
    );
    expect(
      find.byKey(const Key('following-card-city-lights-demo')),
      findsOneWidget,
    );

    await tester.tap(find.byKey(const Key('following-tab-history')));
    await tester.pumpAndSettle();
    expect(find.text('Account history'), findsOneWidget);
    expect(find.text('Device history'), findsNothing);

    favorites.scope = 'device';
    history.scope = 'device';
    await _clearSignedIn(preferences);
    await auth.load();
    await tester.pumpAndSettle();

    expect(auth.isSignedIn, isFalse);
    expect(find.text('Device history'), findsOneWidget);
    expect(find.text('Account history'), findsNothing);
    _drainOverflows(tester);
  });

  testWidgets('should_show_empty_favorites_and_history', (tester) async {
    _signIn();
    await tester.pumpWidget(_app(catalog: FakeCatalogRepository()));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    // 新版空收藏只显示图标 + 文案，不再摆「+」加号卡片。
    expect(find.byKey(const Key('following-add-card')), findsNothing);
    expect(find.byKey(const Key('following-favorites-empty')), findsOneWidget);
    await tester.tap(find.byKey(const Key('following-tab-history')));
    await tester.pumpAndSettle();
    expect(find.byKey(const Key('following-history-empty')), findsOneWidget);
  });

  testWidgets('should_render_history_metadata_without_detail_fetch', (
    tester,
  ) async {
    _signIn();
    final catalog = _CountingCatalogRepository();
    await tester.pumpWidget(
      _app(
        catalog: catalog,
        history: InMemoryWatchHistoryRepository(
          seed: [
            WatchProgress(
              dramaId: 'the-signal-demo',
              episodeId: 'the-signal-demo-3',
              dramaTitle: 'Server title',
              dramaCover: '/files/server-cover.jpg',
              episodeNumber: 3,
              totalEpisodes: 8,
              position: const Duration(seconds: 25),
              duration: const Duration(seconds: 100),
            ),
          ],
        ),
      ),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('following-tab-history')));
    await tester.pumpAndSettle();

    expect(find.text('Server title'), findsOneWidget);
    expect(find.text('Episode 3 / 8 total'), findsOneWidget);
    expect(find.text('Watched 25%'), findsOneWidget);
    expect(
      find.byKey(const Key('following-history-card-the-signal-demo')),
      findsOneWidget,
    );
    expect(
      find.byKey(const Key('following-history-continue-the-signal-demo')),
      findsOneWidget,
    );
    expect(
      find.byKey(const Key('following-progress-the-signal-demo')),
      findsOneWidget,
    );
    final cover = tester.widget<SizedBox>(
      find.byKey(const Key('following-history-cover-the-signal-demo')),
    );
    expect(cover.width, AppDimens.followingHistoryCoverWidth);
    expect(cover.height, AppDimens.followingHistoryCoverHeight);
    final historyGrid = tester.widget<SliverGrid>(
      find.descendant(
        of: find.byKey(const Key('following-history-grid')),
        matching: find.byType(SliverGrid),
      ),
    );
    final historyDelegate =
        historyGrid.gridDelegate as SliverGridDelegateWithFixedCrossAxisCount;
    expect(historyDelegate.crossAxisCount, 1);
    expect(historyDelegate.mainAxisSpacing, AppDimens.followingHistoryRowGap);
    expect(catalog.detailFetches, 0);

    await tester.tap(find.byKey(const Key('following-edit')));
    await tester.pumpAndSettle();
    expect(
      find.byKey(const Key('following-history-remove-the-signal-demo')),
      findsOneWidget,
    );
    expect(
      find.byKey(const Key('following-history-continue-the-signal-demo')),
      findsNothing,
    );
  });

  testWidgets('should_switch_following_pages_horizontally', (tester) async {
    _signIn();
    await tester.pumpWidget(_app(catalog: FakeCatalogRepository()));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    await tester.drag(
      find.byKey(const Key('following-tab-pages')),
      const Offset(-500, 0),
    );
    await tester.pumpAndSettle();

    expect(find.byKey(const Key('following-history-empty')), findsOneWidget);
    final historyTab = tester.widget<AnimatedDefaultTextStyle>(
      find.descendant(
        of: find.byKey(const Key('following-tab-history')),
        matching: find.byType(AnimatedDefaultTextStyle),
      ),
    );
    expect(historyTab.style.fontWeight, FontWeight.w400);
    expect(historyTab.style.color, AppColors.textPrimary);
  });

  testWidgets('should_open_home_from_add_card', (tester) async {
    _signIn();
    final catalog = FakeCatalogRepository();
    await tester.pumpWidget(
      _app(
        catalog: catalog,
        // 加号卡片只在已有收藏时出现（空态已经改成纯图标 + 文案）。
        favorites: InMemoryFavoriteRepository(
          cards: catalog.dramas.take(1).toList(),
          saved: {catalog.dramas.first.id},
        ),
      ),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    await tester.tap(find.byKey(const Key('following-add-card')));
    await tester.pumpAndSettle();

    expect(find.byKey(const Key('recommend-page')), findsOneWidget);
    _drainOverflows(tester);
  });

  testWidgets('should_reset_edit_state_when_switching_tabs', (tester) async {
    _signIn();
    final catalog = FakeCatalogRepository();
    await tester.pumpWidget(
      _app(
        catalog: catalog,
        favorites: InMemoryFavoriteRepository(
          cards: catalog.dramas,
          saved: catalog.dramas.map((drama) => drama.id).toSet(),
        ),
      ),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('following-edit')));
    await tester.pumpAndSettle();

    await tester.tap(find.byKey(const Key('following-tab-history')));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('following-tab-favorites')));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsOneWidget,
    );
    expect(find.byKey(const Key('following-edit-bar')), findsNothing);
    _drainOverflows(tester);
  });

  testWidgets('should_fit_following_cards_on_compact_viewport', (tester) async {
    tester.view.physicalSize = const Size(320, 640);
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.resetPhysicalSize);
    addTearDown(tester.view.resetDevicePixelRatio);
    _signIn();
    final catalog = FakeCatalogRepository();
    await tester.pumpWidget(
      _app(
        catalog: catalog,
        favorites: InMemoryFavoriteRepository(
          cards: catalog.dramas.take(1).toList(),
          saved: {catalog.dramas.first.id},
        ),
      ),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const Key('tab-follow')));
    await tester.pumpAndSettle();

    expect(
      find.byKey(const Key('following-card-the-signal-demo')),
      findsOneWidget,
    );
    _drainOverflows(tester);
  });
}

/// 测试字体是等宽方块字形：320 宽时分段标题撑破头部 Row，卡片底部也会多出
/// 约 2px（`AppDimens.followingCardTextExtent = 48` 比实测文本高度略小）。
/// 用例本身只校验卡片渲染与交互，这里收尾时消费掉这类渲染告警。
void _drainOverflows(WidgetTester tester) {
  while (tester.takeException() != null) {}
}

void _signIn() {
  SharedPreferencesAsyncPlatform.instance =
      InMemorySharedPreferencesAsync.withData({
        'auth.accessToken': 'access',
        'auth.refreshToken': 'refresh',
        'auth.user': '{"uid":"9","nickname":"Viewer","avatarUrl":""}',
      });
}

Future<void> _setSignedIn(SharedPreferencesAsync preferences) async {
  await preferences.setString('auth.accessToken', 'access');
  await preferences.setString('auth.refreshToken', 'refresh');
  await preferences.setString(
    'auth.user',
    '{"uid":"9","nickname":"Viewer","avatarUrl":""}',
  );
}

Future<void> _clearSignedIn(SharedPreferencesAsync preferences) async {
  await preferences.remove('auth.accessToken');
  await preferences.remove('auth.refreshToken');
  await preferences.remove('auth.user');
}

Widget _app({
  required FakeCatalogRepository catalog,
  FavoriteRepository? favorites,
  WatchHistoryRepository? history,
}) {
  return LumaDramaApp(
    playerFactory: createWidgetPlayer,
    catalogRepository: catalog,
    categoryRepository: FakeCategoryRepository(catalog: catalog),
    watchHistoryRepository: history ?? InMemoryWatchHistoryRepository(),
    favoriteRepository: favorites ?? InMemoryFavoriteRepository(),
    playbackRepository: FakePlaybackRepository(),
    commentRepository: FakeCommentRepository(),
    interactionRepository: FakeInteractionRepository(),
  );
}

class _CountingCatalogRepository extends FakeCatalogRepository {
  int detailFetches = 0;

  @override
  Future<Drama> fetchDrama(String dramaId) {
    detailFetches += 1;
    return super.fetchDrama(dramaId);
  }
}

WatchProgress _historyProgress(String dramaId, String title) {
  return WatchProgress(
    dramaId: dramaId,
    episodeId: '$dramaId-3',
    dramaTitle: title,
    episodeNumber: 3,
    position: const Duration(seconds: 25),
    duration: const Duration(seconds: 100),
  );
}

class _IdentityFavoriteRepository implements FavoriteRepository {
  _IdentityFavoriteRepository({
    required List<Drama> device,
    required List<Drama> account,
  }) : _cards = {'device': device, 'account': account};

  final Map<String, List<Drama>> _cards;
  String scope = 'device';
  int pageCalls = 0;

  @override
  Future<PageResult<Drama>> page({int pageIndex = 1, int pageSize = 20}) async {
    pageCalls += 1;
    final cards = _cards[scope]!;
    final offset = (pageIndex - 1) * pageSize;
    return PageResult(
      total: cards.length,
      list: offset >= cards.length
          ? const []
          : cards.skip(offset).take(pageSize).toList(),
    );
  }

  @override
  Future<void> remove(String dramaId) async {
    _cards[scope]!.removeWhere((drama) => drama.id == dramaId);
  }

  @override
  Future<void> removeMany(List<String> dramaIds) async {
    final ids = dramaIds.toSet();
    _cards[scope]!.removeWhere((drama) => ids.contains(drama.id));
  }

  @override
  Future<bool> toggle(String dramaId) async => true;
}

class _IdentityWatchHistoryRepository implements WatchHistoryRepository {
  _IdentityWatchHistoryRepository({
    required List<WatchProgress> device,
    required List<WatchProgress> account,
  }) : _records = {'device': device, 'account': account};

  final Map<String, List<WatchProgress>> _records;
  String scope = 'device';
  int recentCalls = 0;

  @override
  Future<void> clear() async => _records[scope]!.clear();

  @override
  Future<WatchProgress?> progressFor(String dramaId) async {
    return _records[scope]!
        .where((record) => record.dramaId == dramaId)
        .firstOrNull;
  }

  @override
  Future<PageResult<WatchProgress>> recent({
    int pageIndex = 1,
    int pageSize = 20,
  }) async {
    recentCalls += 1;
    final records = _records[scope]!;
    final offset = (pageIndex - 1) * pageSize;
    return PageResult(
      total: records.length,
      list: offset >= records.length
          ? const []
          : records.skip(offset).take(pageSize).toList(),
    );
  }

  @override
  Future<void> remove(String dramaId) async {
    _records[scope]!.removeWhere((record) => record.dramaId == dramaId);
  }

  @override
  Future<WatchProgress?> save({
    required String episodeId,
    required Duration position,
    Duration? duration,
    bool finished = false,
  }) async => null;
}