// test/position_guard_test.dart
import 'package:flutter_test/flutter_test.dart';
import 'package:qingting_player/utils/position_guard.dart';

void main() {
  group('shouldIgnorePositionRegression', () {
    test('正常播放推进：不拦截', () {
      expect(
        shouldIgnorePositionRegression(
          lastKnown: const Duration(seconds: 77),
          incoming: const Duration(seconds: 78),
          isChangingTrack: false,
          isRecovering: false,
        ),
        isFalse,
      );
    });

    test('77s 突然归零：拦截（这就是"从头重播"的元凶）', () {
      expect(
        shouldIgnorePositionRegression(
          lastKnown: const Duration(seconds: 77),
          incoming: Duration.zero,
          isChangingTrack: false,
          isRecovering: false,
        ),
        isTrue,
      );
    });

    test('用户切歌：允许回退', () {
      expect(
        shouldIgnorePositionRegression(
          lastKnown: const Duration(seconds: 200),
          incoming: Duration.zero,
          isChangingTrack: true,
          isRecovering: false,
        ),
        isFalse,
      );
    });

    test('自动恢复中：允许回退（我们自己重开的）', () {
      expect(
        shouldIgnorePositionRegression(
          lastKnown: const Duration(seconds: 200),
          incoming: Duration.zero,
          isChangingTrack: false,
          isRecovering: true,
        ),
        isFalse,
      );
    });

    test('刚开始播放（最后位置 <10s）：不拦截，避免误伤起播', () {
      expect(
        shouldIgnorePositionRegression(
          lastKnown: const Duration(seconds: 8),
          incoming: Duration.zero,
          isChangingTrack: false,
          isRecovering: false,
        ),
        isFalse,
      );
    });

    test('小幅回退（77s -> 73s）：不拦截', () {
      expect(
        shouldIgnorePositionRegression(
          lastKnown: const Duration(seconds: 77),
          incoming: const Duration(seconds: 73),
          isChangingTrack: false,
          isRecovering: false,
        ),
        isFalse,
      );
    });
  });
}