/// 구독 플랜 타입
enum SubscriptionPlanType {
  free,      // 무료 플랜
  basic,     // 기본 유료 플랜
  premium,   // 프리미엄 플랜
  enterprise // 기업용 플랜
}

/// 구독 상태
enum SubscriptionStatus {
  active,    // 활성화 상태
  canceled,  // 취소됨 (아직 만료 안됨)
  expired,   // 만료됨
  pending,   // 결제 대기 중
  failed     // 결제 실패
}

/// 구독 모델
class Subscription {
  final String id;
  final String userId;
  final String? clubId;
  final SubscriptionPlanType planType;
  final SubscriptionStatus status;
  final DateTime startDate;
  final DateTime endDate;
  final double price;
  final String currency;
  final bool autoRenew;
  final Map<String, dynamic>? features;
  final String? paymentMethod;
  final String? transactionId;
  final DateTime createdAt;
  final DateTime updatedAt;

  Subscription({
    required this.id,
    required this.userId,
    this.clubId,
    required this.planType,
    required this.status,
    required this.startDate,
    required this.endDate,
    required this.price,
    required this.currency,
    required this.autoRenew,
    this.features,
    this.paymentMethod,
    this.transactionId,
    required this.createdAt,
    required this.updatedAt,
  });

  /// JSON에서 구독 객체 생성
  factory Subscription.fromJson(Map<String, dynamic> json) {
    return Subscription(
      id: json['id'],
      userId: json['userId'],
      clubId: json['clubId'],
      planType: SubscriptionPlanType.values.firstWhere(
        (e) => e.toString().split('.').last == json['planType'],
        orElse: () => SubscriptionPlanType.free,
      ),
      status: SubscriptionStatus.values.firstWhere(
        (e) => e.toString().split('.').last == json['status'],
        orElse: () => SubscriptionStatus.expired,
      ),
      startDate: DateTime.parse(json['startDate']),
      endDate: DateTime.parse(json['endDate']),
      price: json['price'].toDouble(),
      currency: json['currency'],
      autoRenew: json['autoRenew'] ?? false,
      features: json['features'],
      paymentMethod: json['paymentMethod'],
      transactionId: json['transactionId'],
      createdAt: DateTime.parse(json['createdAt']),
      updatedAt: DateTime.parse(json['updatedAt']),
    );
  }

  /// 구독 객체를 JSON으로 변환
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'userId': userId,
      'clubId': clubId,
      'planType': planType.toString().split('.').last,
      'status': status.toString().split('.').last,
      'startDate': startDate.toIso8601String(),
      'endDate': endDate.toIso8601String(),
      'price': price,
      'currency': currency,
      'autoRenew': autoRenew,
      'features': features,
      'paymentMethod': paymentMethod,
      'transactionId': transactionId,
      'createdAt': createdAt.toIso8601String(),
      'updatedAt': updatedAt.toIso8601String(),
    };
  }

  /// 구독이 활성 상태인지 확인
  bool get isActive => status == SubscriptionStatus.active;

  /// 구독이 만료되었는지 확인
  bool get isExpired => status == SubscriptionStatus.expired || 
                        DateTime.now().isAfter(endDate);

  /// 구독 남은 일수 계산
  int get daysLeft {
    if (isExpired) return 0;
    return endDate.difference(DateTime.now()).inDays;
  }

  /// 구독 플랜 이름 (한글)
  String get planName {
    switch (planType) {
      case SubscriptionPlanType.free:
        return '무료';
      case SubscriptionPlanType.basic:
        return '기본';
      case SubscriptionPlanType.premium:
        return '프리미엄';
      case SubscriptionPlanType.enterprise:
        return '기업용';
    }
  }
}

/// 구독 플랜 정보 모델
class SubscriptionPlan {
  final SubscriptionPlanType type;
  final String name;
  final String description;
  final double monthlyPrice;
  final double yearlyPrice;
  final String currency;
  final List<String> features;
  final int maxMembers;
  final int maxEvents;
  final bool hasAdvancedStats;
  final bool hasCustomization;
  final bool hasPriority;

  SubscriptionPlan({
    required this.type,
    required this.name,
    required this.description,
    required this.monthlyPrice,
    required this.yearlyPrice,
    required this.currency,
    required this.features,
    required this.maxMembers,
    required this.maxEvents,
    required this.hasAdvancedStats,
    required this.hasCustomization,
    required this.hasPriority,
  });

  /// JSON에서 구독 플랜 객체 생성
  factory SubscriptionPlan.fromJson(Map<String, dynamic> json) {
    return SubscriptionPlan(
      type: SubscriptionPlanType.values.firstWhere(
        (e) => e.toString().split('.').last == json['type'],
        orElse: () => SubscriptionPlanType.free,
      ),
      name: json['name'],
      description: json['description'],
      monthlyPrice: json['monthlyPrice'].toDouble(),
      yearlyPrice: json['yearlyPrice'].toDouble(),
      currency: json['currency'],
      features: List<String>.from(json['features']),
      maxMembers: json['maxMembers'],
      maxEvents: json['maxEvents'],
      hasAdvancedStats: json['hasAdvancedStats'] ?? false,
      hasCustomization: json['hasCustomization'] ?? false,
      hasPriority: json['hasPriority'] ?? false,
    );
  }

  /// 구독 플랜 객체를 JSON으로 변환
  Map<String, dynamic> toJson() {
    return {
      'type': type.toString().split('.').last,
      'name': name,
      'description': description,
      'monthlyPrice': monthlyPrice,
      'yearlyPrice': yearlyPrice,
      'currency': currency,
      'features': features,
      'maxMembers': maxMembers,
      'maxEvents': maxEvents,
      'hasAdvancedStats': hasAdvancedStats,
      'hasCustomization': hasCustomization,
      'hasPriority': hasPriority,
    };
  }

  /// 기본 구독 플랜 목록 반환
  static List<SubscriptionPlan> getDefaultPlans() {
    return [
      SubscriptionPlan(
        type: SubscriptionPlanType.free,
        name: '무료',
        description: '소규모 클럽을 위한 기본 기능',
        monthlyPrice: 0,
        yearlyPrice: 0,
        currency: 'KRW',
        features: [
          '최대 10명 회원 관리',
          '기본 점수 기록',
          '간단한 통계',
        ],
        maxMembers: 10,
        maxEvents: 5,
        hasAdvancedStats: false,
        hasCustomization: false,
        hasPriority: false,
      ),
      SubscriptionPlan(
        type: SubscriptionPlanType.basic,
        name: '기본',
        description: '중소규모 클럽을 위한 확장 기능',
        monthlyPrice: 9900,
        yearlyPrice: 99000,
        currency: 'KRW',
        features: [
          '최대 30명 회원 관리',
          '상세 점수 분석',
          '이벤트 관리',
          '회원 통계',
        ],
        maxMembers: 30,
        maxEvents: 20,
        hasAdvancedStats: true,
        hasCustomization: false,
        hasPriority: false,
      ),
      SubscriptionPlan(
        type: SubscriptionPlanType.premium,
        name: '프리미엄',
        description: '대규모 클럽을 위한 고급 기능',
        monthlyPrice: 19900,
        yearlyPrice: 199000,
        currency: 'KRW',
        features: [
          '무제한 회원 관리',
          '고급 통계 및 분석',
          '무제한 이벤트',
          '맞춤형 보고서',
          '우선 지원',
        ],
        maxMembers: 100,
        maxEvents: 100,
        hasAdvancedStats: true,
        hasCustomization: true,
        hasPriority: true,
      ),
      SubscriptionPlan(
        type: SubscriptionPlanType.enterprise,
        name: '기업용',
        description: '프로 클럽 및 단체를 위한 맞춤형 솔루션',
        monthlyPrice: 49900,
        yearlyPrice: 499000,
        currency: 'KRW',
        features: [
          '무제한 회원 및 이벤트',
          '전문가 수준 분석',
          '맞춤형 기능',
          '전담 지원',
          'API 액세스',
        ],
        maxMembers: 1000,
        maxEvents: 1000,
        hasAdvancedStats: true,
        hasCustomization: true,
        hasPriority: true,
      ),
    ];
  }
}