ReelShort/test/playback/playback_position_cache_test.dart

// Author: fruit.com.cn

import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/core/data/services/playback_position_cache.dart';

void main() {
  test('should_clamp_invalid_or_out_of_range_position_when_caching', () {
    expect(
      clampPlaybackPosition(
        const Duration(seconds: -1),
        const Duration(seconds: 10),
      ),
      Duration.zero,
    );
    expect(
      clampPlaybackPosition(
        const Duration(seconds: 12),
        const Duration(seconds: 10),
      ),
      const Duration(seconds: 10),
    );
    expect(
      clampPlaybackPosition(
        const Duration(seconds: 5),
        const Duration(seconds: 10),
      ),
      const Duration(seconds: 5),
    );

    final cache = PlaybackPositionCache();
    cache.save(
      episodeId: 'episode-3',
      dramaId: 'drama-a',
      position: const Duration(minutes: 4),
      duration: const Duration(minutes: 3),
    );
    expect(
      cache.read('episode-3', dramaId: 'drama-a')?.position,
      const Duration(minutes: 3),
    );
  });

  test('should_store_and_read_recent_position_when_drama_matches', () {
    final now = DateTime(2026, 10, 22, 12);
    final cache = PlaybackPositionCache(now: () => now);

    cache.save(
      episodeId: 'episode-3',
      dramaId: 'drama-a',
      position: const Duration(minutes: 1, seconds: 20),
      duration: const Duration(minutes: 3),
    );

    final entry = cache.read('episode-3', dramaId: 'drama-a');
    expect(entry, isNotNull);
    expect(entry!.position, const Duration(minutes: 1, seconds: 20));
    expect(entry.duration, const Duration(minutes: 3));
    expect(entry.updatedAt, now);
  });

  test('should_reject_cached_position_when_drama_does_not_match', () {
    final cache = PlaybackPositionCache();
    cache.save(
      episodeId: 'episode-3',
      dramaId: 'drama-a',
      position: const Duration(seconds: 80),
      duration: const Duration(minutes: 3),
    );

    expect(cache.read('episode-3', dramaId: 'drama-b'), isNull);
  });

  test('should_use_latest_saved_episode_when_timestamps_match', () {
    final now = DateTime(2026, 10, 22, 12);
    final cache = PlaybackPositionCache(now: () => now);
    cache.save(
      episodeId: 'episode-1',
      dramaId: 'drama-a',
      position: const Duration(seconds: 30),
      duration: const Duration(minutes: 3),
    );
    cache.save(
      episodeId: 'episode-2',
      dramaId: 'drama-a',
      position: const Duration(seconds: 45),
      duration: const Duration(minutes: 3),
    );

    expect(cache.latestForDrama('drama-a')?.episodeId, 'episode-2');
  });

  test('should_evict_oldest_entry_when_capacity_exceeded', () {
    var now = DateTime(2026, 10, 22, 12);
    final cache = PlaybackPositionCache(now: () => now, maxEntries: 2);

    for (final episodeId in ['episode-1', 'episode-2', 'episode-3']) {
      cache.save(
        episodeId: episodeId,
        dramaId: 'drama-a',
        position: const Duration(seconds: 30),
        duration: const Duration(minutes: 3),
      );
      now = now.add(const Duration(minutes: 1));
    }

    expect(cache.read('episode-1', dramaId: 'drama-a'), isNull);
    expect(cache.read('episode-2', dramaId: 'drama-a'), isNotNull);
    expect(cache.read('episode-3', dramaId: 'drama-a'), isNotNull);
  });

  test('should_reject_expired_cached_position', () {
    var now = DateTime(2026, 10, 22, 12);
    final cache = PlaybackPositionCache(now: () => now);
    cache.save(
      episodeId: 'episode-3',
      dramaId: 'drama-a',
      position: const Duration(seconds: 80),
      duration: const Duration(minutes: 3),
    );
    now = now.add(const Duration(days: 1));

    expect(cache.read('episode-3', dramaId: 'drama-a'), isNull);
  });
}