// Author: fruit.com.cn

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/core/data/models/drama.dart';
import 'package:fruitshorts/core/data/models/watch_progress.dart';
import 'package:fruitshorts/core/data/services/android_picture_in_picture.dart';
import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
import 'package:fruitshorts/core/data/services/playback_session.dart';
import 'package:fruitshorts/pages/player/player_logic.dart';
import 'package:fruitshorts/pages/player/player_view.dart';

import '../support/fake_watch_history.dart';
import '../support/widget_player.dart';

Drama _drama(String id, {List<int> numbers = const [1, 2, 3]}) => Drama(
  id: id,
  title: id,
  synopsis: 'synopsis',
  posterUrl: '/files/poster.png',
  episodes: [
    for (final number in numbers)
      Episode(
        id: '$id-$number',
        number: number,
        title: 'Episode $number',
        videoUrl: 'https://example.test/clip.mp4',
        isFree: true,
      ),
  ],
);

PlayerLogic _logic(FakeWatchHistory history, {Drama? drama}) {
  final logic = PlayerLogic(
    history: history,
    playback: FakePlaybackRepository(),
    pictureInPicture: AndroidPictureInPicture(
      channel: const MethodChannel('test/progress/pip'),
    ),
    waitForFrame: () async {},
  );
  if (drama != null) {
    logic.attach(
      PlayerPage(drama: drama, initialIndex: 0),
      isMounted: () => true,
    );
    logic.start(
      factory: (episode) => WidgetPlayer(),
      coordinator: PlaybackCoordinator(),
    );
  }
  return logic;
}

/// 排空 session 串行队列，避免测试结束在 dispose 中途。
Future<void> _drain(PlayerLogic logic) async {
  for (var attempt = 0; attempt < 4; attempt++) {
    await pumpEventQueue();
    await logic.session.playbackSettled;
    await logic.session.preloadSettled;
  }
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('progress throttle', () {
    test('should_report_once_per_interval_when_progress_ticks_keep_coming', () {
      final logic = _logic(FakeWatchHistory());
      final start = DateTime(2026, 10, 16, 12);
      logic.lastProgressWrite = start;

      // 契约建议每 10 秒一次：3 秒、9 秒都不报，第 10 秒报一次
      expect(logic.progressInterval, const Duration(seconds: 10));
      expect(logic.shouldReportProgress(start.add(const Duration(seconds: 3))), isFalse);
      expect(logic.shouldReportProgress(start.add(const Duration(seconds: 9))), isFalse);
      expect(logic.shouldReportProgress(start.add(const Duration(seconds: 10))), isTrue);
      // 报过之后节流窗口重新开始
      expect(logic.shouldReportProgress(start.add(const Duration(seconds: 15))), isFalse);
      expect(logic.shouldReportProgress(start.add(const Duration(seconds: 20))), isTrue);
      logic.dispose();
    });

    test('should_write_immediately_when_saving_on_episode_switch_or_exit', () async {
      final history = FakeWatchHistory();
      final drama = _drama('signal');
      final logic = _logic(history, drama: drama);

      // 切集/退出/切后台走 saveCurrentProgress：不受 10 秒节流限制
      await logic.queueProgress(
        drama,
        drama.episodes[0],
        const Duration(seconds: 5),
        duration: const Duration(minutes: 3),
      );
      await logic.queueProgress(
        drama,
        drama.episodes[1],
        const Duration(seconds: 6),
        duration: const Duration(minutes: 3),
      );

      expect(history.writes, [
        'signal-1|5000|false',
        'signal-2|6000|false',
      ]);
      logic.dispose();
    });

    test('should_report_finished_when_episode_plays_to_the_end', () async {
      final history = FakeWatchHistory();
      final drama = _drama('signal');
      final logic = _logic(history, drama: drama);

      await logic.queueProgress(
        drama,
        drama.episodes[0],
        const Duration(minutes: 3),
        duration: const Duration(minutes: 3),
        finished: true,
      );

      expect(history.writes, ['signal-1|180000|true']);
      logic.dispose();
    });
  });

  group('resume positioning', () {
    test('should_take_position_from_server_when_record_matches_the_episode', () async {
      final history = FakeWatchHistory(
      )..records['signal'] = const WatchProgress(
        dramaId: 'signal',
        episodeId: 'signal-2',
        position: Duration(seconds: 42),
        duration: Duration(minutes: 3),
      );
      final logic = _logic(history, drama: _drama('signal'));
      await _drain(logic);

      await logic.loadResumePoint();

      expect(logic.resumePositionFor('signal-2'), const Duration(seconds: 42));
      // 记录里不是这一集：不给定位（从头播，避免"看第 1 集却跳到第 2 集的位置"）
      expect(logic.resumePositionFor('signal-1'), isNull);
      expect(logic.resumePositionFor('signal-3'), isNull);
      logic.dispose();
    });

    test('should_have_no_resume_position_when_server_read_fails', () async {
      final history = FakeWatchHistory()..failReads = true;
      final logic = _logic(history, drama: _drama('signal'));
      await _drain(logic);

      await logic.loadResumePoint();

      expect(logic.resumePoint, isNull);
      expect(logic.resumeLoaded, isTrue);
      logic.dispose();
    });

    test('should_not_seek_when_position_is_zero', () async {
      final history = FakeWatchHistory()
        ..records['signal'] = const WatchProgress(
          dramaId: 'signal',
          episodeId: 'signal-1',
          position: Duration.zero,
          duration: Duration(minutes: 3),
        );
      final logic = _logic(history, drama: _drama('signal'));
      await _drain(logic);

      await logic.loadResumePoint();

      expect(logic.resumePositionFor('signal-1'), isNull);
      logic.dispose();
      await _drain(logic);
    });
  });
}