import 'dart:convert';
import 'dart:typed_data';

import 'package:archive/archive.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_learn_flutter/src/core/asset/data/asset_repository.dart';
import 'package:halkyon_learn_flutter/src/core/content/content_blocks.dart';
import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
import 'package:halkyon_learn_flutter/src/feature/archive/data/archive_importer.dart';
import 'package:halkyon_learn_flutter/src/feature/archive/data/archive_reader.dart';
import 'package:halkyon_learn_flutter/src/feature/card/data/card_payload.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_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/explore/data/release_copier.dart';
import 'package:halkyon_learn_flutter/src/feature/learning_path/data/learning_path_payload.dart';
import 'package:halkyon_learn_flutter/src/feature/learning_path/data/learning_path_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/learning_path/data/learning_path_step_payload.dart';
import 'package:halkyon_learn_flutter/src/feature/learning_path/model/exercise.dart';
import 'package:halkyon_learn_flutter/src/feature/learning_path/model/learning_path.dart';
import 'package:halkyon_learn_flutter/src/feature/learning_path/model/step_content.dart';
import 'package:halkyon_learn_flutter/src/feature/note/data/note_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/pdf_source/data/pdf_source_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/study/data/review_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/study/model/rating.dart';
import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_payload.dart';
import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_repository.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 '../../support/fake_asset_gateway.dart';
import '../../support/fake_asset_server_gateway.dart';
import '../../support/fake_card_gateway.dart';
import '../../support/fake_dictionary_gateway.dart';
import '../../support/fake_learning_path_gateway.dart';
import '../../support/fake_note_gateway.dart';
import '../../support/fake_pdf_source_gateway.dart';
import '../../support/fake_review_gateway.dart';
import '../../support/fake_studyset_gateway.dart';
import '../../support/fake_tag_gateway.dart';
import '../../support/memory_asset_file_cache.dart';

/// The JSON a synced [payload] holds.
Map<String, Object?> json(ByteData payload) =>
    jsonDecode(utf8.decode(Uint8List.sublistView(payload)))
        as Map<String, Object?>;

/// [files] (paths and their JSON or bytes) as a `.zip`.
Uint8List zip(Map<String, Object> files) {
  final archive = Archive();
  for (final MapEntry(key: path, value: content) in files.entries) {
    archive.add(
      ArchiveFile.bytes(
        path,
        content is Uint8List ? content : utf8.encode(jsonEncode(content)),
      ),
    );
  }
  return Uint8List.fromList(ZipEncoder().encodeBytes(archive));
}

/// A Japanese studyset with Vocabulary inside: a card of its own, a word
/// named by its JMdict entry, one naming an entry the instance doesn't
/// hold, and reviews of the first two.
Map<String, Object> japanese({int format = 1}) => {
  'archive.json': {'format': format},
  'studyset.json': {
    'id': 'japanese',
    'position': 'a0',
    'payload': json(
      encodeStudysetPayload(
        StudysetContent(
          title: 'Japanese',
          description: RichContent.empty(),
          license: 'CC-BY-NC-SA-4.0',
        ),
      ),
    ),
  },
  'vocabulary/studyset.json': {
    'id': 'vocabulary',
    'position': 'a0',
    'payload': json(
      encodeStudysetPayload(StudysetContent.titled('Vocabulary')),
    ),
  },
  'cards/own.json': {
    'id': 'own',
    'position': 'a0',
    'tags': ['Kana'],
    'payload': json(
      encodeCardPayload(
        CardContent(
          front: RichContent.plain('あ'),
          back: RichContent.plain('a'),
        ),
      ),
    ),
  },
  'vocabulary/cards/table.json': {
    'id': 'table',
    'position': 'a0',
    'entry': {'source': 'jmdict', 'language': 'en', 'id': '1078630'},
  },
  'vocabulary/cards/gone.json': {
    'id': 'gone',
    'position': 'a1',
    'entry': {'source': 'jmdict', 'language': 'en', 'id': '404'},
  },
  'reviews.json': [
    {'card': 'own', 'rating': 3, 'reviewedAt': '2026-06-09T11:11:08Z'},
    {
      'card': 'table',
      'rating': 1,
      'reviewedAt': '2026-06-10T08:00:00Z',
      'durationMs': 4200,
    },
    {'card': 'gone', 'rating': 4, 'reviewedAt': '2026-06-11T08:00:00Z'},
  ],
};

void main() {
  group('reading', () {
    test('an archive says what it holds', () {
      final archive = readArchive(zip(japanese()));

      expect(archive.studysets, 2);
      expect(archive.cards, 3);
      expect(archive.reviews, hasLength(3));
      expect(archive.reviews[1].durationMs, 4200);
      expect(archive.reviews[1].reviewedAt, DateTime.utc(2026, 6, 10, 8));
      expect(archive.reviews.first.mode, 'review');
    });

    test('refuses a file that is no zip, a zip without archive.json, a '
        'newer format and reviews it cannot read', () {
      Matcher refused(ArchiveProblem problem) => throwsA(
        isA<ArchiveUnreadable>().having((e) => e.problem, 'problem', problem),
      );

      expect(
        () => readArchive(Uint8List.fromList(utf8.encode('not a zip'))),
        refused(ArchiveProblem.notAnArchive),
      );
      expect(
        () => readArchive(zip({...japanese()}..remove('archive.json'))),
        refused(ArchiveProblem.notAnArchive),
      );
      expect(
        () => readArchive(zip(japanese(format: 2))),
        refused(ArchiveProblem.newerFormat),
      );
      expect(
        () => readArchive(
          zip({
            ...japanese(),
            'reviews.json': [
              {'card': 'own', 'rating': 7, 'reviewedAt': '2026-06-09'},
            ],
          }),
        ),
        refused(ArchiveProblem.unreadable),
      );
    });
  });

  group('importing', () {
    late CardRepository cards;
    late StudysetRepository studysets;
    late TagRepository tags;
    late ReviewRepository reviews;
    late LearningPathRepository paths;
    late ArchiveImporter importer;

    setUp(() {
      studysets = StudysetRepository(FakeStudysetGateway());
      cards = CardRepository(FakeCardGateway());
      final notes = NoteRepository(FakeNoteGateway());
      paths = LearningPathRepository(FakeLearningPathGateway());
      tags = TagRepository(
        FakeTagGateway(),
        cardChanges: cards.changes,
        noteChanges: notes.changes,
        pathChanges: paths.changes,
      );
      final assets = AssetRepository(
        FakeAssetGateway(),
        FakeAssetServerGateway(),
        MemoryAssetFileCache(),
      );
      final pdfs = PdfSourceRepository(FakePdfSourceGateway(), assets);
      reviews = ReviewRepository(FakeReviewGateway());
      importer = ArchiveImporter(
        ReleaseCopier(studysets, cards, notes, paths, pdfs, tags, assets),
        DictionaryRepository(
          FakeDictionaryGateway(
            words: [
              word(
                '1078630',
                'テーブル',
                glosses: ['table'],
                labels: ['common', 'jlpt:n5'],
                pos: ['n'],
                version: 'v1',
              ),
            ],
          ),
        ),
        reviews,
      );
    });

    test('content naming a studyset of the archive, as a study button '
        'does, names it as it is in the library', () async {
      final archive = {
        ...japanese(),
        'paths/drill/path.json': {
          'id': 'drill',
          'position': 'a0',
          'payload': json(
            encodeLearningPathPayload(LearningPathContent.titled('Drill')),
          ),
        },
        'paths/drill/steps/go.json': {
          'id': 'go',
          'position': 'a0',
          'kind': StepKind.info.value,
          'payload': json(
            encodeStepPayload(
              StepContent.empty(StepKind.info).withField(
                StepField.body,
                RichContent({
                  'document': {
                    'type': 'page',
                    'children': [
                      {
                        'type': studyButtonBlockType,
                        'data': {studyButtonStudysetKey: 'vocabulary'},
                      },
                    ],
                  },
                }),
              ),
            ),
          ),
        },
      };

      await importer.import(readArchive(zip(archive)));

      final vocabulary = (await studysets.all()).singleWhere(
        (s) => s.content.title == 'Vocabulary',
      );
      final path = (await paths.pathsOf(
        (await studysets.all()).singleWhere((s) => s.parentId == null).id,
      )).single;
      final step = (await paths.stepsOf(path.id)).single;
      expect(
        jsonEncode(step.content.body.toJson()),
        contains('"$studyButtonStudysetKey":"${vocabulary.id}"'),
      );
    });

    test("brings the studysets and cards in as the person's own, a word "
        'from the dictionary as adding it makes it, the reviews onto the '
        'cards they were of; an entry the instance lacks is left out and '
        'counted', () async {
      final imported = await importer.import(readArchive(zip(japanese())));

      expect(imported.cards, 2);
      expect(imported.reviews, 2);
      expect(imported.missingEntries, 1);
      final all = await studysets.all();
      expect(all.map((s) => s.content.title), ['Japanese', 'Vocabulary']);
      expect(all.every((s) => s.content.published == null), isTrue);

      final vocabulary = all.singleWhere(
        (s) => s.content.title == 'Vocabulary',
      );
      final word = (await cards.cardsOf(vocabulary.id)).single;
      expect(word.content.entry, (source: 'jmdict', id: '1078630'));
      expect(word.content.entryVersion, 'v1');
      final own = (await cards.cardsOf(imported.studysetId)).single;
      expect(own.content.published, isNull);

      final tagging = await tags.read();
      expect(
        {for (final tag in tagging.of(word.id)) tag.name},
        containsAll(['JLPT-N5']),
      );
      expect({for (final tag in tagging.of(own.id)) tag.name}, {'Kana'});

      final logged = await reviews.all();
      expect(
        {for (final review in logged) review.cardId: review.rating},
        {own.id: Rating.good, word.id: Rating.again},
      );
      expect(
        (await cards.allCards()).every((card) => card.imported),
        isTrue,
        reason: 'counted as imported, not written',
      );
    });
  });
}