import 'dart:convert';
import 'dart:io';

import 'package:halkyon_learn_curator/src/sources/jlpt.dart';
import 'package:halkyon_learn_curator/src/sources/jmdict.dart';
import 'package:test/test.dart';

void main() {
  late List<Map<String, Object?>> lines;

  setUpAll(() async {
    final jlpt = await readJlptLevels(Directory('test/fixtures/jlpt'));
    lines = [
      for (final line in await jmdictDictionary(
        File('test/fixtures/jmdict-eng-sample.json')
            .openRead()
            .transform(utf8.decoder),
        jlpt: jlpt,
      ).toList())
        jsonDecode(line) as Map<String, Object?>,
    ];
  });

  Map<String, Object?> entry(String headword) =>
      lines.skip(1).firstWhere((line) => line['headword'] == headword);

  test('the header says what the file holds, and whose it is', () {
    final header = lines.first;
    expect(header['format'], 'halkyon-dictionary');
    expect(header['formatVersion'], 1);
    expect(header['source'], 'jmdict');
    expect(header['sourceVersion'], '3.6.2 (2026-10-05)');
    expect((header['language'], header['glossLanguage']), ('ja', 'en'));
    expect(header['license'], 'CC-BY-SA-4.0');
    expect(
      [
        for (final credit in header['credits']! as List)
          (credit as Map)['name'],
      ],
      ['JMdict', 'jmdict-simplified', 'JLPT vocabulary lists'],
    );
    expect(lines, hasLength(7));
  });

  test('a word: its headword and reading, labels, and the keys a search '
      'matches, in kanji, kana, romaji and its meanings', () {
    final word = entry('食べる');

    expect(word['id'], '1358280');
    expect(word['reading'], 'たべる');
    expect(word['labels'], ['common', 'jlpt:n5']);
    expect(
      word['keys'],
      containsAll(['食べる', '喰べる', 'たべる', 'taberu', 'to eat', 'eat']),
    );
    // A form for searching only isn't shown.
    final forms = (word['entry']! as Map)['forms']! as List;
    expect([for (final form in forms) (form as Map)['text']], ['食べる']);
  });

  test('a word written in kana has no reading of its own; katakana is '
      'searched as hiragana too', () {
    final word = entry('テレビ');

    expect(word.containsKey('reading'), isFalse);
    expect(word['keys'], containsAll(['テレビ', 'てれび', 'terebi', 'tv']));
  });

  test('long vowels are found typed once', () {
    expect(entry('東京')['keys'], containsAll(['toukyou', 'tokyo']));
  });

  test('the reading is one that belongs to the headword', () {
    expect(entry('四')['reading'], 'し');
  });

  test("the headword is the JLPT lists' spelling, at the easiest level a "
      'word is listed at', () {
    final word = entry('歯磨き');

    expect(word['labels'], ['common', 'jlpt:n2']);
  });

  test('words rank N5 first, then down the levels, then the other common '
      'words, then the rest', () {
    int rank(String headword) => entry(headword)['rank']! as int;

    expect(rank('食べる'), lessThan(rank('歯磨き')));
    expect(rank('歯磨き'), lessThan(rank('東京')));
    expect(rank('東京'), lessThan(rank('〃')));
  });
}