import 'package:flutter/foundation.dart';

import 'storage_service.dart';
import 'notification_service.dart';
import 'encouragement_service.dart';
import 'points_service.dart';
import 'achievement_service.dart';

/// Service Locator - 统一管理所有服务实例
class ServiceLocator {
  static final ServiceLocator _instance = ServiceLocator._internal();
  factory ServiceLocator() => _instance;
  ServiceLocator._internal();

  late StorageService _storageService;
  late NotificationService _notificationService;
  late EncouragementService _encouragementService;
  late PointsService _pointsService;
  late AchievementService _achievementService;
  bool _isInitialized = false;

  /// 初始化所有服务
  Future<void> initialize() async {
    if (_isInitialized) return;

    try {
      // 初始化存储服务
      _storageService = StorageService();
      await _storageService.init();

      // 初始化通知服务
      _notificationService = NotificationService();
      await _notificationService.initialize();
      await _notificationService.requestPermissions();

      // 初始化鼓励语服务
      _encouragementService = EncouragementService();
      await _encouragementService.loadMessages();

      // 初始化积分服务
      _pointsService = PointsService();

      // 初始化成就服务
      _achievementService = AchievementService();

      _isInitialized = true;
      if (kDebugMode) {
        print('ServiceLocator initialized successfully');
      }
    } catch (e) {
      if (kDebugMode) {
        print('Failed to initialize ServiceLocator: $e');
      }
      rethrow;
    }
  }

  /// 获取存储服务实例
  StorageService get storageService {
    _checkInitialized();
    return _storageService;
  }

  /// 获取通知服务实例
  NotificationService get notificationService {
    _checkInitialized();
    return _notificationService;
  }

  /// 获取鼓励语服务实例
  EncouragementService get encouragementService {
    _checkInitialized();
    return _encouragementService;
  }

  /// 获取积分服务实例
  PointsService get pointsService {
    _checkInitialized();
    return _pointsService;
  }

  /// 获取成就服务实例
  AchievementService get achievementService {
    _checkInitialized();
    return _achievementService;
  }

  /// 检查服务是否已初始化
  void _checkInitialized() {
    if (!_isInitialized) {
      throw Exception('ServiceLocator has not been initialized yet. Call initialize() first.');
    }
  }

  /// 重置服务（用于测试）
  void reset() {
    _isInitialized = false;
  }
}