import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_learn_flutter/src/core/content/rich_content.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/dictionary/data/dictionary_adder.dart';
import 'package:halkyon_learn_flutter/src/feature/dictionary/data/dictionary_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/dictionary/data/dictionary_updates.dart';
import 'package:halkyon_learn_flutter/src/feature/dictionary/model/dictionary.dart';
import 'package:halkyon_learn_flutter/src/feature/tag/data/tag_repository.dart';

import '../../support/fake_card_gateway.dart';
import '../../support/fake_dictionary_gateway.dart';
import '../../support/fake_tag_gateway.dart';

final taberu = word(
  '1358280',
  '食べる',
  reading: 'たべる',
  glosses: ['to eat'],
  labels: ['common', 'jlpt:n5'],
  pos: ['v1', 'vt'],
);
final terebi = word(
  '1080510',
  'テレビ',
  glosses: ['television', 'TV'],
  labels: ['common', 'jlpt:n5'],
  pos: ['n'],
);

void main() {
  group('a character', () {
    test('reads its meanings, readings, grade, strokes and frequency from '
        'the entry', () {
      final read = DictionaryCharacter.fromEntry(
        ref: (source: 'kanjidic', id: '食'),
        headword: '食',
        labels: ['jlpt:n5', 'grade:2'],
        entry:
            '{"meanings":["eat","food"],"on":["ショク","ジキ"],'
            '"kun":["く.う","た.べる"],"grade":2,"strokes":9,'
            '"frequency":328,"jlpt":5}',
      );

      expect(read.meanings, ['eat', 'food']);
      expect(read.onReadings, ['ショク', 'ジキ']);
      expect(read.kunReadings, ['く.う', 'た.べる']);
      expect((read.grade, read.strokes, read.frequency), (2, 9, 328));
      expect(read.jlpt, 5);
      expect(read.isKana, isFalse);
    });

    test('becomes a character card that keeps where it is from; a kana '
        'means its romaji', () {
      final eat = character(
        '食',
        meanings: ['eat'],
        on: ['ショク'],
        kun: ['た.べる'],
      ).card;
      expect(eat.type, CardType.character);
      expect(eat.front.plainText.trim(), '食');
      expect(eat.meanings, ['eat']);
      expect(eat.onReadings, ['ショク']);
      expect(eat.kunReadings, ['た.べる']);
      expect(eat.entry, (source: 'kanjidic', id: '食'));
      expect(eat.isComplete, isTrue);

      final a = character('あ', labels: ['hiragana'], romaji: 'a').card;
      expect(a.meanings, ['a']);
      expect(a.isComplete, isTrue);
    });

    test('names the tags by JLPT level, school grade and script', () {
      expect(
        character('食', labels: ['jlpt:n5', 'grade:2'], grade: 2).tagNames,
        ['JLPT-N5', 'Grade 2'],
      );
      expect(
        character(
          '亜',
          labels: ['jlpt:n1', 'grade:secondary'],
          grade: 8,
        ).tagNames,
        ['JLPT-N1', 'Secondary school'],
      );
      expect(character('ア', labels: ['katakana']).tagNames, ['Katakana']);
      expect(isDictionaryTagName('grade 2'), isTrue);
      expect(isDictionaryTagName('Hiragana'), isTrue);
      expect(isDictionaryTagName('Kanji I like'), isFalse);
    });
  });

  group('a character of another language', () {
    test("Chinese: its pinyin as its readings, its HSK level and Hong Kong's "
        'grade from its labels', () {
      final say = DictionaryCharacter.fromEntry(
        ref: (source: 'unihan-hant', id: '說'),
        headword: '說',
        labels: const ['hsk:1', 'common', 'grade:1', 'radical:149'],
        entry:
            '{"meanings": ["speak", "say"], "pinyin": ["shuō", "shuì"], '
            '"strokes": 14, "simplified": ["说"]}',
        language: 'zh-Hant',
      );

      expect(say.onReadings, ['shuō', 'shuì']);
      expect(say.kunReadings, isEmpty);
      expect((say.hsk, say.grade, say.strokes), (1, 1, 14));
      expect(say.tagNames, ['HSK-1', 'Grade 1']);
      expect(say.card.onReadings, ['shuō', 'shuì']);
    });

    test('Korean: a Hanja its sounds and native meanings, the 1,800 of '
        'education tagged; a letter its sound and name', () {
      final water = DictionaryCharacter.fromEntry(
        ref: (source: 'unihan-ko', id: '水'),
        headword: '水',
        labels: const ['education', 'radical:85'],
        entry:
            '{"meanings": ["water"], "eum": ["수"], "hun": ["물"], '
            '"eumhun": ["물 수"], "strokes": 4}',
        language: 'ko',
      );
      expect(water.onReadings, ['수']);
      expect(water.kunReadings, ['물']);
      expect(water.isEducationHanja, isTrue);
      expect(water.tagNames, ['Education Hanja']);

      final giyeok = DictionaryCharacter.fromEntry(
        ref: (source: 'unihan-ko', id: 'ㄱ'),
        headword: 'ㄱ',
        labels: const ['hangul'],
        entry: '{"romaji": "g, k", "script": "hangul", "name": "기역"}',
        language: 'ko',
      );
      expect(giyeok.isKana, isTrue);
      expect(giyeok.meaningsShown, ['g, k', '기역']);
      expect(giyeok.tagNames, ['Hangul']);
    });

    test('Greek: a letter with its capital, its transliteration and its '
        'names', () {
      final beta = DictionaryCharacter.fromEntry(
        ref: (source: 'greek-alphabet', id: 'β'),
        headword: 'Β β',
        labels: const ['greek'],
        entry:
            '{"romaji": "v", "script": "greek", "name": "βήτα", '
            '"englishName": "beta", "sound": "v"}',
        language: 'el',
      );

      expect(beta.card.front.plainText.trim(), 'Β β');
      expect(beta.card.meanings, ['v', 'βήτα (beta)']);
      expect(beta.tagNames, ['Greek alphabet']);
      expect(isDictionaryTagName('Greek alphabet'), isTrue);
    });

    test("a Korean word's KRDict level names its tag as KRDict does", () {
      final school = DictionaryWord.fromEntry(
        ref: (source: 'krdict', id: '73276'),
        headword: '학교',
        reading: '학꾜',
        labels: const ['level:beginner'],
        entry:
            '{"pos": "noun", "hanja": ["學校"], '
            '"senses": [{"glosses": ["school"]}]}',
        language: 'ko',
      );

      expect(school.koreanLevel, 1);
      expect(school.tagNames, ['초급', 'Noun']);
      expect(isDictionaryTagName('초급'), isTrue);
      expect(school.card.reading, '학꾜');
    });
  });

  group('Cards behind the dictionary', () {
    late FakeCardGateway cardGateway;
    late CardRepository cards;
    setUp(() {
      cardGateway = FakeCardGateway();
      cards = CardRepository(cardGateway);
    });
    tearDown(() => cards.dispose());

    test('are those whose entry the source corrected since, with the entry '
        'as it is now; cards of their own and made before versions are '
        'never asked about', () async {
      final gateway = FakeDictionaryGateway(
        words: [
          word('1358280', '食べる', glosses: ['to eat'], version: 'v2'),
          word('1080510', 'テレビ', glosses: ['TV'], version: 'v1'),
        ],
      );
      final updates = DictionaryUpdates(DictionaryRepository(gateway), cards);
      CardContent made(String id, String? version) => CardContent(
        type: CardType.vocabulary,
        front: RichContent.plain(id),
        back: RichContent.empty(),
        meanings: const ['x'],
        entry: (source: 'jmdict', id: id),
        entryVersion: version,
      );
      final behind = await cards.create('japanese', made('1358280', 'v1'));
      await cards.create('japanese', made('1080510', 'v1'));
      await cards.create('japanese', made('1080510', null));
      await cards.create('japanese', CardContent.empty());

      final found = await updates.behind(
        await cards.cardsOf('japanese'),
        (front: 'ja', back: 'en'),
      );

      expect(found.keys, [behind]);
      expect(found[behind]!.version, 'v2');
      expect(gateway.changedAsked, [2]);
    });

    test('of one entry keeping different versions are each compared', () async {
      final gateway = FakeDictionaryGateway(
        words: [
          word('1358280', '食べる', glosses: ['to eat'], version: 'v2'),
        ],
      );
      final updates = DictionaryUpdates(DictionaryRepository(gateway), cards);
      CardContent made(String version) => CardContent(
        type: CardType.vocabulary,
        front: RichContent.plain('食べる'),
        back: RichContent.empty(),
        meanings: const ['to eat'],
        entry: (source: 'jmdict', id: '1358280'),
        entryVersion: version,
      );
      await cards.create('japanese', made('v2'));
      final old = await cards.create('japanese', made('v1'));

      final found = await updates.behind(
        await cards.cardsOf('japanese'),
        (front: 'ja', back: 'en'),
      );

      expect(found.keys, [old]);
    });
  });

  group('a word', () {
    test('reads its senses from the entry, the codes with them', () {
      final read = DictionaryWord.fromEntry(
        ref: (source: 'jmdict', id: '1358280'),
        headword: '食べる',
        reading: 'たべる',
        labels: ['common', 'jlpt:n5'],
        entry:
            '{"forms":[{"text":"食べる"}],"senses":[{"glosses":["to eat"],'
            '"pos":["v1","vt"]},{"glosses":["to live on"],"misc":["uk"]}]}',
      );

      expect(read.senses, const [
        VocabularySense(glosses: ['to eat'], pos: ['v1', 'vt']),
        VocabularySense(glosses: ['to live on'], misc: ['uk']),
      ]);
      expect(read.jlpt, 5);
    });

    test('becomes a vocabulary card that keeps where it is from; a word in '
        'kana has no reading', () {
      final card = taberu.card;
      expect(card.type, CardType.vocabulary);
      expect(card.front.plainText.trim(), '食べる');
      expect(card.reading, 'たべる');
      expect(card.meanings, ['to eat']);
      expect(card.entry, (source: 'jmdict', id: '1358280'));

      expect(terebi.card.reading, '');
    });

    test('its first three example sentences become hints, the word in bold '
        'and the English below', () {
      String example(int n) =>
          '{"text":"食べ","ja":"$n: 魚を食べた。","en":"Sentence $n."}';
      final word = DictionaryWord.fromEntry(
        ref: (source: 'jmdict', id: '1358280'),
        headword: '食べる',
        reading: 'たべる',
        labels: const [],
        entry:
            '{"senses":[{"glosses":["to eat"],"examples":[${example(1)},'
            '${example(2)}]},{"glosses":["to live on"],"examples":['
            '${example(3)},${example(4)}]}]}',
      );

      final hints = word.card.hints;
      expect(hints, hasLength(3));
      expect(hints.first.plainText, '1: 魚を食べた。\nSentence 1.');
      final document = hints.first.editorJson['document']! as Map;
      final first = (document['children']! as List).first as Map;
      expect((first['data']! as Map)['delta'], [
        {'insert': '1: 魚を'},
        {
          'insert': '食べ',
          'attributes': {'bold': true},
        },
        {'insert': 'た。'},
      ]);
    });
  });

  group('the repository', () {
    test('asks for the dictionaries once, again after a failure', () async {
      final gateway = FakeDictionaryGateway()..fail = Exception('offline');
      final repository = DictionaryRepository(gateway);

      await expectLater(repository.dictionaries(), throwsException);
      gateway.fail = null;
      expect(await repository.dictionaries(), [jmdict]);
      await repository.dictionaries();
      expect(gateway.asked, 2);
    });

    test("finds a studyset's dictionary by its front's language, with "
        "meanings in its back's, else in English; one of words unless a "
        'kind is asked for', () async {
      const german = Dictionary(
        source: 'jmdict',
        sourceVersion: '1',
        kind: DictionaryKind.words,
        language: 'ja',
        glossLanguage: 'de',
        license: 'CC-BY-SA-4.0',
        credits: [],
        entryCount: 1,
      );
      final repository = DictionaryRepository(
        FakeDictionaryGateway(available: [kanjidic, jmdict, german]),
      );

      expect(await repository.dictionaryFor((front: 'ja', back: 'de')), german);
      expect(await repository.dictionaryFor((front: 'ja', back: 'fr')), jmdict);
      expect(await repository.dictionaryFor((front: 'ja', back: null)), jmdict);
      expect(await repository.dictionaryFor((front: 'ko', back: 'en')), isNull);
      expect(await repository.dictionaryFor((front: null, back: 'en')), isNull);
      expect(
        await repository.dictionaryFor((
          front: 'ja',
          back: 'en',
        ), kind: DictionaryKind.characters),
        kanjidic,
      );
    });

    test('brings every word of a level, a page at a time', () async {
      final words = [
        for (var i = 0; i < DictionaryRepository.page + 3; i++)
          word('$i', 'w$i', labels: ['jlpt:n5']),
      ];
      final counts = <int>[];

      final all = await DictionaryRepository(
        FakeDictionaryGateway(words: words),
      ).allLabelled(jmdict, 'jlpt:n5', onProgress: counts.add);

      expect(all, words);
      expect(counts, [
        DictionaryRepository.page,
        DictionaryRepository.page + 3,
      ]);
    });
  });

  group('adding words', () {
    late CardRepository cards;
    late TagRepository tags;
    late DictionaryAdder adder;

    setUp(() {
      cards = CardRepository(FakeCardGateway());
      tags = TagRepository(FakeTagGateway());
      adder = DictionaryAdder(cards, tags);
    });
    tearDown(() async {
      await cards.dispose();
      await tags.dispose();
    });

    test('makes each word a card once, tagged with its level and word '
        'class, marked as from the dictionary', () async {
      expect(await adder.add('japanese', [taberu]), (added: 1, skipped: 0));
      expect(
        await adder.add('japanese', [taberu, terebi]),
        (added: 1, skipped: 1),
      );

      final made = await cards.cardsOf('japanese');
      expect(
        [for (final card in made) card.content.entry?.id],
        [
          '1358280',
          '1080510',
        ],
      );
      final tagging = await tags.read();
      expect(
        [for (final tag in tagging.of(made.first.id)) tag.name],
        [
          'JLPT-N5',
          'Verb',
        ],
      );
      expect(
        [for (final tag in tagging.of(made.last.id)) tag.name],
        [
          'JLPT-N5',
          'Noun',
        ],
      );
      expect((await cards.allCards()).every((card) => card.imported), isTrue);
    });

    test('makes one card of a word added twice at once, or twice in one '
        'list', () async {
      final both = await Future.wait([
        adder.add('japanese', [taberu]),
        adder.add('japanese', [taberu]),
      ]);
      expect(both, [(added: 1, skipped: 0), (added: 0, skipped: 1)]);
      expect(
        await adder.add('japanese', [terebi, terebi]),
        (added: 1, skipped: 1),
      );
      expect(await cards.cardsOf('japanese'), hasLength(2));
    });

    test('names the tags by level and word class', () {
      expect(taberu.tagNames, ['JLPT-N5', 'Verb']);
      expect(
        word('1', 'x', pos: ['adj-na', 'n']).tagNames,
        ['na-Adjective', 'Noun'],
      );
      expect(word('2', 'y', pos: ['vt']).tagNames, isEmpty);
    });
  });
}