import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/core/data/models/drama.dart';
import 'package:fruitshorts/core/data/models/home_feed.dart';
import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
import 'package:fruitshorts/core/data/services/catalog_controller.dart';

void main() {
  test('should_distinguish_empty_catalog_from_load_failure_when_retry_succeeds', () async {
    final repository = ScriptedCatalogRepository();
    final controller = CatalogController(repository);

    await controller.load();
    expect(controller.dramas, isEmpty);
    expect(controller.error, isNull);

    repository.fail = true;
    await controller.load();
    expect(controller.error, isNotNull);

    repository.fail = false;
    repository.feed = HomeFeed(
      sections: [
        FeedSection(code: 'hot', title: '热门推荐', dramas: [_card('1')]),
      ],
    );
    await controller.load();
    expect(controller.error, isNull);
    expect(controller.dramas, hasLength(1));
    expect(controller.sections.single.title, '热门推荐');
  });

  test('should_request_drama_detail_once_when_it_is_loaded_on_demand', () async {
    final repository = ScriptedCatalogRepository();
    final controller = CatalogController(repository);
    repository.feed = HomeFeed(
      sections: [
        FeedSection(code: 'hot', title: '热门推荐', dramas: [_card('1')]),
      ],
    );
    await controller.load();

    final card = controller.dramas.single;
    expect(card.episodes, isEmpty);

    final detail = await controller.requireDetail(card);
    expect(detail.episodes, hasLength(2));
    expect(repository.detailCalls, 1);

    // 第二次已经是详情，直接复用，不再请求
    await controller.requireDetail(detail);
    expect(repository.detailCalls, 1);
    expect(controller.dramas.single.episodes, hasLength(2));
  });

}

Drama _card(String id) => Drama(
  id: id,
  title: 'Drama $id',
  synopsis: '简介 $id',
  posterUrl: '/files/$id.jpg',
);

Drama _detail(String id) => Drama(
  id: id,
  title: 'Drama $id',
  synopsis: '简介 $id',
  posterUrl: '/files/$id.jpg',
  detailLoaded: true,
  episodes: const [
    Episode(id: '1', number: 1, title: '第一集', isFree: true),
    Episode(id: '2', number: 2, title: '第二集', isFree: false),
  ],
);

class ScriptedCatalogRepository implements CatalogRepository {
  bool fail = false;
  HomeFeed feed = const HomeFeed();
  int detailCalls = 0;

  @override
  Future<HomeFeed> fetchHomeFeed() async {
    if (fail) throw StateError('offline');
    return feed;
  }

  @override
  Future<HomeFeed> fetchDiscoverFeed() async => feed;

  @override
  Future<Drama> fetchDrama(String dramaId) async {
    detailCalls++;
    return _detail(dramaId);
  }

}