// 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/content_category.dart';
import 'package:fruitshorts/core/data/models/drama.dart';
import 'package:fruitshorts/core/data/models/feed_page.dart';
import 'package:fruitshorts/core/data/models/home_feed.dart';
import 'package:fruitshorts/core/data/repositories/catalog_repository.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/theme/app_colors.dart';
import 'package:fruitshorts/pages/player/player_view.dart';
import 'package:fruitshorts/pages/recommend/recommend_types.dart';
import 'package:fruitshorts/pages/recommend/widgets/recommend_top_nav.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_category.dart';
import '../support/fake_haptics.dart';
import '../support/fake_interaction_repositories.dart';
import '../support/widget_player.dart';

const _categories = [
  ContentCategory(id: 'costume', name: '古装'),
  ContentCategory(id: 'community', name: '社群'),
  ContentCategory(id: 'uplifting', name: '爽剧'),
  ContentCategory(id: 'sweet', name: '甜宠'),
  ContentCategory(id: 'face-slap', name: '打脸虐渣'),
  ContentCategory(id: 'angst', name: '虐恋'),
];

void main() {
  setUp(() {
    SharedPreferencesAsyncPlatform.instance =
        InMemorySharedPreferencesAsync.empty();
  });

  testWidgets('should_render_inner_top_tabs_in_order', (tester) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(tester, repository);

    final tabKeys = [
      const Key('recommend-tab-recommend'),
      const Key('recommend-tab-playlist'),
      const Key('recommend-tab-all'),
    ];
    final centers = tabKeys
        .map((key) => tester.getCenter(find.byKey(key)).dx)
        .toList();
    expect(centers, orderedEquals(centers.toList()..sort()));
    expect(find.byKey(const Key('recommend-section-hits')), findsNothing);
    expect(find.text('Featured'), findsOneWidget);
    expect(find.text('Categories'), findsNothing);
    expect(find.text('Charts'), findsNothing);
    expect(find.byKey(const Key('mine-mini-player')), findsNothing);
    expect(find.byType(FloatingActionButton), findsNothing);
    expect(find.byKey(const Key('home-tabs-bar')), findsOneWidget);

    final selectedUnderline = tester.widget<Container>(
      find.byKey(const Key('recommend-tab-recommend-underline')),
    );
    expect(
      (selectedUnderline.decoration! as BoxDecoration).color,
      AppColors.brandRed,
    );
    final idleUnderline = tester.widget<Container>(
      find.byKey(const Key('recommend-tab-playlist-underline')),
    );
    expect(
      (idleUnderline.decoration! as BoxDecoration).color,
      AppColors.transparent,
    );
  });

  testWidgets('should_render_only_categories_returned_by_api', (tester) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(
      tester,
      repository,
      categories: const [ContentCategory(id: 'romance', name: 'Romance')],
    );

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

    expect(find.byKey(const Key('recommend-channel-nav')), findsOneWidget);
    expect(find.byKey(const Key('recommend-tab-romance')), findsOneWidget);
    expect(find.byKey(const Key('recommend-tab-costume')), findsNothing);
    expect(find.byKey(const Key('recommend-tab-community')), findsNothing);
  });

  testWidgets('should_switch_home_sections_without_pushing_pages', (
    tester,
  ) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(tester, repository);

    expect(find.byKey(const Key('recommend-feed-player')), findsOneWidget);
    expect(find.byKey(const Key('recommend-section-hits')), findsNothing);

    await tester.tap(find.byKey(const Key('recommend-tab-playlist')));
    await tester.pumpAndSettle();
    _drainLayoutExceptions(tester);
    expect(find.byKey(const Key('recommend-section-hits')), findsOneWidget);
    expect(
      Navigator.of(
        tester.element(find.byKey(const Key('recommend-page'))),
      ).canPop(),
      isFalse,
    );

    await _openAllDramasTab(tester);
    expect(find.byKey(const Key('all-dramas-grid')), findsOneWidget);
    expect(find.byKey(const Key('filter-page')), findsNothing);
  });

  testWidgets('should_keep_scroll_position_when_switching_sections', (
    tester,
  ) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(tester, repository);
    await _openAllDramasTab(tester);

    await tester.drag(
      find.byKey(const Key('all-dramas-scroll')),
      const Offset(0, -320),
    );
    await tester.pumpAndSettle();
    final scrollable = find
        .descendant(
          of: find.byKey(const Key('all-dramas-scroll')),
          matching: find.byType(Scrollable),
        )
        .first;
    final before = tester.state<ScrollableState>(scrollable).position.pixels;
    expect(before, greaterThan(0));

    await tester.tap(find.byKey(const Key('recommend-tab-playlist')));
    await tester.pumpAndSettle();
    _drainLayoutExceptions(tester);

    await _openAllDramasTab(tester);
    final afterScrollable = find
        .descendant(
          of: find.byKey(const Key('all-dramas-scroll')),
          matching: find.byType(Scrollable),
        )
        .first;
    expect(
      tester.state<ScrollableState>(afterScrollable).position.pixels,
      closeTo(before, 0.1),
    );
  });

  testWidgets('should_swipe_between_inner_sections', (tester) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(tester, repository);

    final pages = find.byKey(const Key('recommend-tab-page-view'));
    final topNavBefore = tester.getRect(
      find.byKey(const Key('recommend-top-nav')),
    );

    await tester.drag(pages, const Offset(-320, 0));
    await tester.pumpAndSettle();
    _drainLayoutExceptions(tester);
    expect(find.byKey(const Key('recommend-section-hits')), findsOneWidget);
    expect(find.byKey(const Key('recommend-feed-player')), findsNothing);
    final selected = tester.widget<Text>(
      find.descendant(
        of: find.byKey(const Key('recommend-tab-playlist')),
        matching: find.text('Playlists'),
      ),
    );
    expect(selected.style?.fontWeight, FontWeight.w400);
    expect(
      tester.getRect(find.byKey(const Key('recommend-top-nav'))),
      topNavBefore,
    );

    await tester.drag(pages, const Offset(-320, 0));
    await tester.pumpAndSettle();
    _drainLayoutExceptions(tester);
    expect(find.byKey(const Key('all-dramas-grid')), findsOneWidget);

    await tester.drag(pages, const Offset(640, 0));
    await tester.pumpAndSettle();
    _drainLayoutExceptions(tester);
    expect(find.byKey(const Key('recommend-feed-player')), findsOneWidget);
    expect(find.byKey(const Key('recommend-tab-recommend')), findsOneWidget);
  });

  testWidgets('should_follow_partial_swipe_before_selected_page_changes', (
    tester,
  ) async {
    await _pumpApp(tester, _PagedCatalogRepository());
    final pages = find.byKey(const Key('recommend-tab-page-view'));
    final gesture = await tester.startGesture(tester.getCenter(pages));
    await gesture.moveBy(const Offset(-30, 0));
    await tester.pump();
    await gesture.moveBy(const Offset(-80, 0));
    await tester.pump();
    final nav = tester.widget<RecommendTopNav>(find.byType(RecommendTopNav));
    expect(nav.pagePosition, inExclusiveRange(0.0, 0.5));
    final underline = tester.widget<Container>(
      find.byKey(const Key('recommend-tab-playlist-underline')),
    );
    final color = (underline.decoration! as BoxDecoration).color!;
    expect(color.a, inExclusiveRange(0.0, 0.5));
    await gesture.up();
    await tester.pumpAndSettle();
    _drainLayoutExceptions(tester);
  });

  testWidgets(
    'should_keep_all_dramas_selected_during_direct_cross_page_click',
    (tester) async {
      await _pumpApp(tester, _PagedCatalogRepository());
      await tester.ensureVisible(find.byKey(const Key('recommend-tab-all')));
      await tester.pumpAndSettle();
      await tester.tap(find.byKey(const Key('recommend-tab-all')));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 70));
      final nav = tester.widget<RecommendTopNav>(find.byType(RecommendTopNav));
      expect(nav.pagePosition, inExclusiveRange(0.5, 1.5));
      expect(nav.selected, RecommendInnerTab.allDramas);
      await tester.pumpAndSettle();
      _drainLayoutExceptions(tester);
      expect(find.byKey(const Key('all-dramas-grid')), findsOneWidget);
    },
  );

  testWidgets('should_load_next_page_without_expanding_page_size', (
    tester,
  ) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(tester, repository);
    await _openAllDramasTab(tester);

    expect(find.byKey(const Key('home-feed-card-page1-0')), findsOneWidget);
    for (var attempt = 0; attempt < 3; attempt++) {
      await tester.drag(
        find.byKey(const Key('all-dramas-scroll')),
        const Offset(0, -800),
      );
      await tester.pumpAndSettle();
      _drainLayoutExceptions(tester);
    }
    expect(repository.cursors, contains('page1'));
    expect(repository.requestedSizes.every((size) => size <= 20), isTrue);

    final gridScrollable = find
        .descendant(
          of: find.byKey(const Key('all-dramas-scroll')),
          matching: find.byType(Scrollable),
        )
        .first;
    final secondPageCard = find.byKey(const Key('home-feed-card-page2-0'));
    final position = tester.state<ScrollableState>(gridScrollable).position;
    await tester.pump();
    position.jumpTo(position.maxScrollExtent);
    await tester.pump();
    position.jumpTo(position.maxScrollExtent);
    await tester.pump();
    _drainLayoutExceptions(tester);
    expect(secondPageCard, findsOneWidget);
  });

  testWidgets('should_open_player_when_grid_card_is_tapped', (tester) async {
    final repository = _PagedCatalogRepository();
    await _pumpApp(tester, repository);
    await _openAllDramasTab(tester);

    await tester.tap(find.byKey(const Key('home-feed-card-page1-0')));
    await tester.pumpAndSettle();

    final player = tester.widget<PlayerPage>(find.byType(PlayerPage).last);
    expect(player.homeMode, isFalse);
  });
}

/// 打开首页内层「全部短剧」页；顺带消费测试字体（Ahem）造成的卡片溢出。
Future<void> _openAllDramasTab(WidgetTester tester) async {
  await tester.ensureVisible(find.byKey(const Key('recommend-tab-all')));
  await tester.pumpAndSettle();
  await tester.tap(find.byKey(const Key('recommend-tab-all')));
  await tester.pumpAndSettle();
  _drainLayoutExceptions(tester);
}

/// 剧单/网格卡片高度按真机字体设计，测试字体行高更大时会溢出几个像素。
void _drainLayoutExceptions(WidgetTester tester) {
  while (tester.takeException() != null) {}
}

Future<void> _pumpApp(
  WidgetTester tester,
  _PagedCatalogRepository repository, {
  List<ContentCategory> categories = _categories,
}) async {
  tester.view.physicalSize = const Size(390, 844);
  tester.view.devicePixelRatio = 1;
  addTearDown(tester.view.resetPhysicalSize);
  addTearDown(tester.view.resetDevicePixelRatio);
  await tester.pumpWidget(
    LumaDramaApp(
      playerFactory: createWidgetPlayer,
      catalogRepository: repository,
      categoryRepository: FakeCategoryRepository(
        catalog: repository,
        categories: categories,
      ),
      watchHistoryRepository: InMemoryWatchHistoryRepository(),
      favoriteRepository: InMemoryFavoriteRepository(
        cards: repository.allDramas,
      ),
      playbackRepository: FakePlaybackRepository(),
      commentRepository: FakeCommentRepository(),
      interactionRepository: FakeInteractionRepository(),
      haptics: FakeHaptics(),
    ),
  );
  await tester.pumpAndSettle();
}

class _PagedCatalogRepository implements CatalogRepository {
  _PagedCatalogRepository()
    : pageOne = List.generate(30, (index) => _drama('page1-$index')),
      pageTwo = List.generate(2, (index) => _drama('page2-$index'));

  final List<Drama> pageOne;
  final List<Drama> pageTwo;
  final List<String?> cursors = [];
  final List<int> requestedSizes = [];

  List<Drama> get allDramas => [...pageOne, ...pageTwo];

  @override
  Future<HomeFeed> fetchHomeFeed() async => _feed(pageOne);

  @override
  Future<HomeFeed> fetchDiscoverFeed() async => _feed(pageOne);

  @override
  Future<FeedPage> fetchFeed({
    List<String> types = const [],
    String? categoryId,
    String? cursor,
    int size = 10,
  }) async {
    requestedSizes.add(size);
    if (types.isNotEmpty) {
      return const FeedPage(dramas: []);
    }
    cursors.add(cursor);
    if (cursor == 'page1') {
      return FeedPage(dramas: pageTwo, hasMore: false);
    }
    return FeedPage(dramas: pageOne, nextCursor: 'page1', hasMore: true);
  }

  @override
  Future<Drama> fetchDrama(String dramaId) async {
    return allDramas.firstWhere((drama) => drama.id == dramaId);
  }

  HomeFeed _feed(List<Drama> dramas) {
    return HomeFeed(
      sections: [FeedSection(code: 'hot', title: 'Hot', dramas: dramas)],
    );
  }
}

Drama _drama(String id) {
  final index = int.tryParse(id.split('-').last) ?? 0;
  return Drama(
    id: id,
    title: 'Grid Drama $id',
    synopsis: 'synopsis',
    posterUrl: '',
    genre: 'Romance',
    category: index.isEven ? '古装' : 'Urban',
    viewCount: (10 - index) * 10000,
    createdAt: DateTime(2026, 10, 1).add(Duration(days: index)),
    detailLoaded: true,
    episodes: [
      Episode(
        id: '$id-1',
        number: 1,
        title: 'Episode 1',
        isFree: true,
        videoUrl: 'https://example.test/$id.mp4',
      ),
    ],
  );
}