import 'dart:async';
import 'time_tracking_service.dart';
import 'statistics_service.dart';

/// 后台同步服务 - 定期同步应用使用数据
class BackgroundSyncService {
  final TimeTrackingService _timeTrackingService = TimeTrackingService();
  final StatisticsService _statisticsService = StatisticsService();
  
  Timer? _syncTimer;
  bool _isRunning = false;

  /// 启动后台同步
  Future<void> start() async {
    if (_isRunning) return;

    _isRunning = true;
    
    // 立即同步一次
    await syncNow();

    // 每 15 分钟同步一次
    _syncTimer = Timer.periodic(const Duration(minutes: 15), (timer) async {
      await syncNow();
    });

    // 启动原生后台追踪
    await _timeTrackingService.startBackgroundTracking();
  }

  /// 停止后台同步
  Future<void> stop() async {
    _isRunning = false;
    _syncTimer?.cancel();
    _syncTimer = null;
    
    await _timeTrackingService.stopBackgroundTracking();
  }

  /// 立即同步
  Future<void> syncNow() async {
    try {
      print('Background sync: Starting sync...');
      
      // 同步今日数据
      await _timeTrackingService.syncTodayData();
      
      // 刷新统计
      await _statisticsService.refreshTodayStats();
      
      print('Background sync: Completed');
    } catch (e) {
      print('Background sync error: $e');
    }
  }

  /// 检查是否正在运行
  bool get isRunning => _isRunning;
}