import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/core/data/models/drama.dart';
import 'package:fruitshorts/l10n/app_localizations.dart';
import 'package:fruitshorts/pages/discover/discover_logic.dart';

import '../support/fake_watch_history.dart';

Drama _drama(String id, {List<int> numbers = const [1, 2, 3]}) => Drama(
  id: id,
  title: id,
  synopsis: 'synopsis',
  posterUrl: '/files/poster.png',
  episodes: [
    for (final number in numbers)
      Episode(
        id: '$id-$number',
        number: number,
        title: 'Episode $number',
        videoUrl: 'https://example.test/clip.mp4',
        isFree: true,
      ),
  ],
);

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('should_resolve_resume_position_of_episode_one_when_constructed', () async {
    final history = FakeWatchHistory()..saved = const Duration(seconds: 4);
    final logic = DiscoverLogic(history: history, drama: _drama('signal'));

    expect(await logic.position, const Duration(seconds: 4));
    expect(history.reads, ['signal']);
    expect(logic.searchOpen, isFalse);
    logic.dispose();
  });

  test('should_reread_resume_position_when_drama_is_swapped', () async {
    final history = FakeWatchHistory();
    final logic = DiscoverLogic(history: history, drama: _drama('signal'));

    logic.drama = _drama('city');
    logic.refreshPosition();
    await logic.position;

    expect(history.reads, ['signal', 'city']);
    logic.dispose();
  });

  test('should_resume_from_last_watch_when_list_card_has_no_episodes', () async {
    final history = FakeWatchHistory()
      ..saved = const Duration(seconds: 9)
      ..lastEpisode = 'signal-2';
    final logic = DiscoverLogic(
      history: history,
      drama: _drama('signal', numbers: const []),
    );

    expect(await logic.position, const Duration(seconds: 9));
    expect(history.reads, ['signal']);
    logic.dispose();
  });

  test('should_have_no_resume_position_when_server_has_no_record', () async {
    final history = FakeWatchHistory();
    final logic = DiscoverLogic(
      history: history,
      drama: _drama('signal', numbers: const []),
    );

    expect(await logic.position, isNull);
    // 续看位置改为按剧问服务端：即使卡片没有剧集也会读一次
    expect(history.reads, ['signal']);
    logic.dispose();
  });

  test('should_show_search_when_flag_is_on_or_text_is_typed', () {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));

    expect(logic.showSearch, isFalse);

    logic.search.text = 'vengeance';
    logic.onSearchChanged();
    expect(logic.showSearch, isTrue);

    logic.search.clear();
    expect(logic.showSearch, isFalse);

    logic.searchOpen = true;
    expect(logic.showSearch, isTrue);
    logic.dispose();
  });

  test('should_match_by_id_and_tolerate_missing_id_when_looking_up_drama', () {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    final catalog = [_drama('signal'), _drama('city')];

    expect(logic.dramaFor('city', catalog)?.id, 'city');
    expect(logic.dramaFor('missing', catalog), isNull);
    expect(logic.dramaFor(null, catalog), isNull);
    expect(logic.dramaFor('city', const []), isNull);
    logic.dispose();
  });

  test('should_adopt_drama_only_when_page_is_active', () {
    final history = FakeWatchHistory();
    final logic = DiscoverLogic(history: history, drama: _drama('signal'));

    void sync(
      Drama next, {
      required bool active,
      required bool wasActive,
      required bool dramaChanged,
      int searchRequest = 0,
      int previousSearchRequest = 0,
    }) => logic.syncDrama(
      active: active,
      wasActive: wasActive,
      nextDrama: next,
      dramaChanged: dramaChanged,
      searchRequest: searchRequest,
      previousSearchRequest: previousSearchRequest,
      isActive: () => active,
    );

    // An inactive page keeps showing its own drama.
    sync(_drama('city'), active: false, wasActive: true, dramaChanged: true);
    expect(logic.drama.id, 'signal');

    // Becoming active adopts the incoming drama.
    sync(_drama('city'), active: true, wasActive: false, dramaChanged: false);
    expect(logic.drama.id, 'city');

    // Staying active with a changed drama re-reads history.
    history.reads.clear();
    sync(_drama('vengeance'), active: true, wasActive: true, dramaChanged: true);
    expect(logic.drama.id, 'vengeance');
    expect(history.reads, ['vengeance']);

    // Staying active with no change leaves both drama and history alone.
    history.reads.clear();
    sync(_drama('other'), active: true, wasActive: true, dramaChanged: false);
    expect(logic.drama.id, 'vengeance');
    expect(history.reads, isEmpty);
    logic.dispose();
  });

  testWidgets('should_open_and_focus_field_when_search_is_requested_and_page_is_active', (
    tester,
  ) async {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: TextField(
            controller: logic.search,
            focusNode: logic.searchFocus,
          ),
        ),
      ),
    );

    logic.syncDrama(
      active: true,
      wasActive: true,
      nextDrama: logic.drama,
      dramaChanged: false,
      searchRequest: 1,
      previousSearchRequest: 0,
      isActive: () => true,
    );

    expect(logic.searchOpen, isTrue);
    await tester.pumpAndSettle();
    expect(logic.searchFocus.hasFocus, isTrue);

    await tester.pumpWidget(const SizedBox.shrink());
    logic.dispose();
  });

  testWidgets('should_keep_search_field_closed_when_page_is_hidden', (
    tester,
  ) async {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: TextField(
            controller: logic.search,
            focusNode: logic.searchFocus,
          ),
        ),
      ),
    );

    // The search request branch is gated on `active`, so a page that is not on
    // screen must neither reveal the field nor pull focus away from the visible tab.
    logic.syncDrama(
      active: false,
      wasActive: false,
      nextDrama: logic.drama,
      dramaChanged: false,
      searchRequest: 1,
      previousSearchRequest: 0,
      isActive: () => false,
    );

    expect(logic.searchOpen, isFalse);
    await tester.pumpAndSettle();
    expect(logic.searchFocus.hasFocus, isFalse);

    await tester.pumpWidget(const SizedBox.shrink());
    logic.dispose();
  });

  testWidgets('should_return_choice_and_forward_it_when_act_runs_embedded', (
    tester,
  ) async {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    final forwarded = <DiscoverPageAction>[];
    final popped = Completer<DiscoverPageAction?>();
    late BuildContext pageContext;

    await tester.pumpWidget(
      MaterialApp(
        home: Builder(
          builder: (context) => TextButton(
            onPressed: () => Navigator.of(context)
                .push<DiscoverPageAction>(
                  MaterialPageRoute<DiscoverPageAction>(
                    builder: (inner) {
                      pageContext = inner;
                      return const SizedBox.shrink();
                    },
                  ),
                )
                .then(popped.complete),
            child: const Text('open'),
          ),
        ),
      ),
    );

    await tester.tap(find.text('open'));
    await tester.pumpAndSettle();

    logic.act(
      pageContext,
      DiscoverPageAction.home,
      embedded: true,
      onAction: forwarded.add,
    );
    expect(forwarded, [DiscoverPageAction.home]);
    expect(Navigator.of(pageContext).canPop(), isTrue);

    logic.act(pageContext, DiscoverPageAction.watchlist, embedded: false);
    await tester.pumpAndSettle();

    await expectLater(popped.future, completion(DiscoverPageAction.watchlist));
    logic.dispose();
  });

  testWidgets('should_show_artwork_notice_when_card_has_no_playable_media', (
    tester,
  ) async {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    late BuildContext context;

    await tester.pumpWidget(
      MaterialApp(
        locale: const Locale('en'),
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: AppLocalizations.supportedLocales,
        home: Builder(
          builder: (inner) {
            context = inner;
            return const Scaffold(body: SizedBox.shrink());
          },
        ),
      ),
    );

    logic.openCard(context, null, embedded: false);
    await tester.pumpAndSettle();

    final l10n = AppLocalizations.of(context)!;
    expect(find.text(l10n.artworkOnlyNotice), findsOneWidget);
    logic.dispose();
  });

  testWidgets('should_forward_chosen_drama_when_card_is_embedded', (tester) async {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    late BuildContext context;
    Drama? selected;

    await tester.pumpWidget(
      MaterialApp(
        home: Builder(
          builder: (inner) {
            context = inner;
            return const SizedBox.shrink();
          },
        ),
      ),
    );

    logic.openCard(
      context,
      _drama('city'),
      embedded: true,
      onDramaSelected: (drama) => selected = drama,
    );

    expect(selected?.id, 'city');
    logic.dispose();
  });

  test('should_do_nothing_when_notifying_after_dispose', () {
    final logic = DiscoverLogic(history: FakeWatchHistory(), drama: _drama('s'));
    var notifications = 0;
    logic.addListener(() => notifications++);

    logic.dispose();
    logic.notify();

    expect(notifications, 0);
  });
}