import 'package:flutter_test/flutter_test.dart';
import 'package:go_router/go_router.dart';
import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
import 'package:halkyon_learn_flutter/src/core/video/media_players.dart';
import 'package:halkyon_learn_flutter/src/feature/card/data/card_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/card/model/card_content.dart';
import 'package:halkyon_learn_flutter/src/feature/jellyfin/model/jellyfin.dart';
import 'package:halkyon_learn_flutter/src/feature/jellyfin/widget/watch_screen.dart';
import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_payload.dart';
import 'package:halkyon_learn_flutter/src/feature/studyset/model/studyset_content.dart';
import 'package:halkyon_learn_flutter/src/feature/tag/data/tag_repository.dart';
import 'package:material_ui/material_ui.dart';

import '../../support/fake_card_gateway.dart';
import '../../support/fake_jellyfin.dart';
import '../../support/fake_studyset_gateway.dart';
import '../../support/fake_tag_gateway.dart';
import '../../support/pump_app.dart';
import '../../support/sample_episode.dart';
import '../../support/test_dependencies.dart';

void main() {
  late FakeCardGateway cardGateway;
  late FakeTagGateway tagGateway;
  late CardRepository cards;
  late TagRepository tags;
  late FakeJellyfinGateway jellyfin;
  late FakeMediaPlayers players;

  setUp(() {
    cardGateway = FakeCardGateway();
    tagGateway = FakeTagGateway();
    cards = CardRepository(cardGateway);
    tags = TagRepository(tagGateway);
    jellyfin = sampleJellyfin();
    players = FakeMediaPlayers();
  });
  tearDown(() async {
    await cards.dispose();
    await tags.dispose();
  });

  /// Opens the sample episode from the Japanese studyset, in a window of
  /// [size].
  Future<void> watch(
    WidgetTester tester, {
    Size size = const Size(1400, 900),
    bool playerAvailable = true,
    JellyfinPlayback? playback,
    Map<(String, int), String>? vtt,
    List<MediaAudioTrack> audio = const [],
  }) async {
    if (playback != null || vtt != null) {
      jellyfin = sampleJellyfin(
        playback: playback ?? sampleEpisodePlayback,
        vtt:
            vtt ??
            {('episode-1', 2): sampleJapanese, ('episode-1', 3): sampleEnglish},
      );
    }
    if (audio.isNotEmpty) {
      players = FakeMediaPlayers(audio: audio);
    }
    tester.view.physicalSize = size;
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.reset);
    final studysets = FakeStudysetGateway()
      ..receiveRemoteChange(
        'japanese',
        encodeStudysetPayload(
          StudysetContent(
            title: 'Japanese',
            description: RichContent.empty(),
            frontLanguage: 'ja',
            backLanguage: 'en',
          ),
        ),
      );
    if (!playerAvailable) {
      players = FakeMediaPlayers(available: false);
    }
    await pumpApp(
      tester,
      testDependencies(
        studysetGateway: studysets,
        cardGateway: cardGateway,
        tagGateway: tagGateway,
        dictionaryGateway: sampleDictionary(),
        jellyfinGateway: jellyfin,
        jellyfinStore: signedInJellyfin(),
        mediaPlayers: players,
      ),
      location: RoutePaths.watch('japanese', 'episode-1'),
    );
    await tester.pumpAndSettle();
  }

  /// Plays on to [position].
  Future<void> playTo(WidgetTester tester, Duration position) async {
    players.last!.moveTo(position);
    await tester.pumpAndSettle();
  }

  testWidgets('the line shown is cut into words, their readings above, its '
      'translation beneath; it follows the video', (tester) async {
    await watch(tester);
    expect(players.opened.single.headers['Authorization'], contains('token-1'));
    expect(jellyfin.reports.single.started, isTrue);

    await playTo(tester, const Duration(seconds: 2));
    expect(find.text('友達'), findsOneWidget);
    expect(find.text('ともだち'), findsOneWidget);
    // 会いました: 会 read あ, its ending as it stands.
    expect(find.text('会'), findsOneWidget);
    expect(find.text('あ'), findsOneWidget);
    expect(find.text('いました'), findsOneWidget);
    expect(find.text('Yesterday I met a friend at the station.'), findsOne);

    // Between lines the last one stays.
    await playTo(tester, const Duration(milliseconds: 5500));
    expect(find.text('友達'), findsOneWidget);

    await playTo(tester, const Duration(seconds: 12));
    expect(find.text('旅'), findsOneWidget);
    expect(find.text('友達'), findsNothing);
  });

  testWidgets('a word tapped pauses the video and shows what it is a form '
      'of; added, it is a flashcard with its line and translation as its '
      'first hint, tagged with the show, and is marked from then on', (
    tester,
  ) async {
    await watch(tester);
    await players.last!.play();
    await playTo(tester, const Duration(seconds: 2));

    await tester.tap(find.text('いました'));
    await tester.pumpAndSettle();

    expect(players.last!.state.value.playing, isFalse);
    expect(find.text('A form of 会う'), findsOneWidget);
    await tester.tap(find.text('Add'));
    await tester.pumpAndSettle();

    expect(find.text('会う added, with this line'), findsOneWidget);
    final card = (await cards.cardsOf('japanese')).single;
    expect(card.content.type, CardType.vocabulary);
    expect(card.content.entry, (source: 'jmdict', id: '6'));
    expect(
      card.content.hints.first.plainText,
      allOf(
        contains('昨日、駅で友達に会いました。'),
        contains('Yesterday I met a friend at the station.'),
      ),
    );
    final tagging = await tags.read();
    expect(
      [for (final tag in tagging.of(card.id)) tag.name],
      containsAll(['Sample Journey', 'JLPT-N5']),
    );
    expect(find.byTooltip('In this studyset'), findsOneWidget);
  });

  testWidgets("the video's words are listed, the most frequent first, "
      'particles left out; one opens its first line', (tester) async {
    await watch(tester);

    expect(find.text('Words in this video'), findsOneWidget);
    final words = [
      for (final tile in tester.widgetList<ListTile>(
        find.descendant(
          of: find.byType(CustomScrollView),
          matching: find.byType(ListTile),
        ),
      ))
        (tile.title! as Text).textSpan!.toPlainText().split(' ').first,
    ];
    // 駅 and 友達 come twice; で, に, を, けど and だ are grammar.
    expect(words.take(2).toSet(), {'駅', '友達'});
    expect(words, isNot(contains('で')));
    expect(words, contains('待つ'));

    await tester.tap(find.textContaining('待つ', findRichText: true).first);
    await tester.pumpAndSettle();
    expect(players.last!.state.value.position, const Duration(seconds: 16));
    expect(find.text('A form of 待つ'), findsOneWidget);
  });

  testWidgets('the next line, the one before and the same again play from '
      'their start; a line can end with a pause', (tester) async {
    await watch(tester);
    await playTo(tester, const Duration(seconds: 7));

    await tester.tap(find.byTooltip('Next line'));
    await tester.pumpAndSettle();
    expect(players.last!.state.value.position, const Duration(seconds: 11));
    expect(players.last!.state.value.playing, isTrue);

    await tester.tap(find.byTooltip('Repeat line'));
    await tester.pumpAndSettle();
    expect(players.last!.state.value.position, const Duration(seconds: 11));

    await tester.tap(find.byTooltip('Previous line'));
    await tester.pumpAndSettle();
    expect(players.last!.state.value.position, const Duration(seconds: 6));

    await tester.tap(find.text('Pause after each line'));
    await tester.pumpAndSettle();
    await playTo(tester, const Duration(milliseconds: 9900));
    expect(players.last!.state.value.playing, isFalse);
  });

  testWidgets('leaving tells the server where the video stopped', (
    tester,
  ) async {
    await watch(tester);
    await playTo(tester, const Duration(seconds: 12));

    GoRouter.of(tester.element(find.byType(WatchScreen))).go(RoutePaths.home);
    await tester.pumpAndSettle();

    expect(jellyfin.reports.last.stopped, isTrue);
    expect(jellyfin.reports.last.position, const Duration(seconds: 12));
    expect(players.last!.disposed, isTrue);
  });

  testWidgets('without a player the subtitles still show, and the screen '
      'says why the video does not', (tester) async {
    await watch(tester, playerAvailable: false);

    expect(find.textContaining("Videos can't play on this device"), findsOne);
    expect(find.text('昨日'), findsNothing);
    expect(find.text('Words in this video'), findsOneWidget);
  });

  testWidgets("the sound is in the studyset's language, whichever track the "
      'file plays first; the menu switches it', (tester) async {
    await watch(
      tester,
      playback: const JellyfinPlayback(
        itemId: 'episode-1',
        mediaSourceId: 'episode-1',
        playSessionId: 'session-1',
        runTime: Duration(minutes: 24),
        subtitles: [
          JellyfinSubtitleTrack(index: 2, title: 'Japanese', language: 'jpn'),
          JellyfinSubtitleTrack(index: 3, title: 'English', language: 'eng'),
        ],
        audio: [
          JellyfinAudioTrack(
            index: 4,
            title: 'German',
            language: 'ger',
            isDefault: true,
          ),
          JellyfinAudioTrack(
            index: 5,
            title: 'English',
            language: 'eng',
            isDefault: true,
          ),
          JellyfinAudioTrack(
            index: 6,
            title: 'Japanese [Original]',
            language: 'jpn',
            isDefault: true,
          ),
        ],
      ),
      // As Android names them.
      audio: const [
        MediaAudioTrack(id: 'a', language: 'de'),
        MediaAudioTrack(id: 'b', language: 'en'),
        MediaAudioTrack(id: 'c', language: 'ja'),
      ],
    );
    expect(players.last!.selectedAudio?.id, 'c');

    await tester.tap(find.byTooltip('Audio and subtitles'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Audio'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('German'));
    await tester.pump();
    await tester.pumpAndSettle();
    expect(players.last!.selectedAudio?.id, 'a');
  });

  testWidgets("a forced track, which only covers what the sound doesn't "
      'say, is never the one read', (tester) async {
    await watch(
      tester,
      playback: const JellyfinPlayback(
        itemId: 'episode-1',
        mediaSourceId: 'episode-1',
        playSessionId: 'session-1',
        runTime: Duration(minutes: 24),
        subtitles: [
          JellyfinSubtitleTrack(
            index: 7,
            title: 'Japanese (forced)',
            language: 'jpn',
            isDefault: true,
            isForced: true,
          ),
          JellyfinSubtitleTrack(index: 2, title: 'Japanese', language: 'jpn'),
          JellyfinSubtitleTrack(index: 3, title: 'English', language: 'eng'),
        ],
      ),
    );
    await playTo(tester, const Duration(seconds: 2));

    expect(find.text('友達'), findsOneWidget);
  });

  testWidgets('a line takes the whole width, its translation on one line '
      'too; the video keeps its size however long the line is', (
    tester,
  ) async {
    final long = List.filled(8, '昨日、駅で友達に会いました。').join();
    await watch(
      tester,
      vtt: {
        ('episode-1', 2):
            'WEBVTT\n\n00:00:01.000 --> 00:00:05.000\n旅\n\n'
            '00:00:06.000 --> 00:00:10.000\n$long\n',
        ('episode-1', 3):
            'WEBVTT\n\n00:00:01.000 --> 00:00:05.000\nA journey.\n\n'
            '00:00:06.000 --> 00:00:10.000\n'
            'So I say, "Here you go!",\nand I lent it to him.\n',
      },
    );
    await playTo(tester, const Duration(seconds: 2));
    final controls = tester.getTopLeft(find.byTooltip('Previous line'));

    await playTo(tester, const Duration(seconds: 7));
    expect(
      find.text('So I say, "Here you go!", and I lent it to him.'),
      findsOneWidget,
    );
    expect(tester.getTopLeft(find.byTooltip('Previous line')), controls);
    expect(tester.takeException(), isNull);
  });

  testWidgets('resizing the window, across every size class, keeps the '
      'video where it is', (tester) async {
    await watch(tester);
    await playTo(tester, const Duration(minutes: 2));
    final playing = players.last;

    for (final size in const [
      Size(800, 900),
      Size(500, 900),
      Size(1400, 900),
    ]) {
      tester.view.physicalSize = size;
      await tester.pumpAndSettle();
    }

    expect(players.opened, hasLength(1));
    expect(players.last, same(playing));
    expect(playing!.disposed, isFalse);
    expect(playing.state.value.position, const Duration(minutes: 2));
  });

  testWidgets('on a phone the words are below the video', (tester) async {
    await watch(tester, size: const Size(412, 915));
    await playTo(tester, const Duration(seconds: 2));

    expect(find.text('友達'), findsOneWidget);
    expect(tester.takeException(), isNull);
  });
}