class ReferralInfo {
  final String referralCode;
  final String shareUrl;
  final int directCount;
  final int activeCount;
  final int pendingCreditCents;
  final int totalEarnedCents;
  final int totalAppliedCents;

  const ReferralInfo({
    required this.referralCode,
    required this.shareUrl,
    required this.directCount,
    required this.activeCount,
    required this.pendingCreditCents,
    required this.totalEarnedCents,
    required this.totalAppliedCents,
  });

  factory ReferralInfo.fromJson(Map<String, dynamic> json) => ReferralInfo(
        referralCode: json['referralCode'] as String? ?? '',
        shareUrl: json['shareUrl'] as String? ?? '',
        directCount: json['directCount'] as int? ?? 0,
        activeCount: json['activeCount'] as int? ?? 0,
        pendingCreditCents: json['pendingCreditCents'] as int? ?? 0,
        totalEarnedCents: json['totalEarnedCents'] as int? ?? 0,
        totalAppliedCents: json['totalAppliedCents'] as int? ?? 0,
      );

  String get pendingCreditFormatted =>
      '\$${(pendingCreditCents / 100).toStringAsFixed(2)}';

  String get totalEarnedFormatted =>
      '\$${(totalEarnedCents / 100).toStringAsFixed(2)}';
}

class ReferralItem {
  final String id;
  final String referredTenantId;
  final String referralCode;
  final String status;  // PENDING | ACTIVE | REWARDED | EXPIRED
  final int level;
  final DateTime registeredAt;
  final DateTime? activatedAt;

  const ReferralItem({
    required this.id,
    required this.referredTenantId,
    required this.referralCode,
    required this.status,
    required this.level,
    required this.registeredAt,
    this.activatedAt,
  });

  factory ReferralItem.fromJson(Map<String, dynamic> json) => ReferralItem(
        id: json['id'] as String,
        referredTenantId: json['referredTenantId'] as String? ?? '',
        referralCode: json['referralCode'] as String? ?? '',
        status: json['status'] as String? ?? 'PENDING',
        level: json['level'] as int? ?? 1,
        registeredAt: DateTime.parse(json['registeredAt'] as String),
        activatedAt: json['activatedAt'] != null
            ? DateTime.parse(json['activatedAt'] as String)
            : null,
      );

  bool get isActive => status == 'ACTIVE' || status == 'REWARDED';
}

// ── User-level personal circle models ─────────────────────────────────────

class UserReferralInfo {
  final String code;
  final String shareUrl;
  final int circleSize;
  final int activeCount;
  final int pointsBalance;
  final int totalEarned;
  final int totalSpent;

  const UserReferralInfo({
    required this.code,
    required this.shareUrl,
    required this.circleSize,
    required this.activeCount,
    required this.pointsBalance,
    required this.totalEarned,
    required this.totalSpent,
  });

  factory UserReferralInfo.fromJson(Map<String, dynamic> json) => UserReferralInfo(
        code: json['code'] as String? ?? '',
        shareUrl: json['shareUrl'] as String? ?? '',
        circleSize: json['circleSize'] as int? ?? 0,
        activeCount: json['activeCount'] as int? ?? 0,
        pointsBalance: json['pointsBalance'] as int? ?? 0,
        totalEarned: json['totalEarned'] as int? ?? 0,
        totalSpent: json['totalSpent'] as int? ?? 0,
      );
}

class CircleMember {
  final String relationshipId;
  final String referredUserId;
  final int level;
  final String status;
  final DateTime joinedAt;
  final DateTime? activatedAt;

  const CircleMember({
    required this.relationshipId,
    required this.referredUserId,
    required this.level,
    required this.status,
    required this.joinedAt,
    this.activatedAt,
  });

  factory CircleMember.fromJson(Map<String, dynamic> json) => CircleMember(
        relationshipId: json['relationshipId'] as String,
        referredUserId: json['referredUserId'] as String,
        level: json['level'] as int? ?? 1,
        status: json['status'] as String? ?? 'PENDING',
        joinedAt: DateTime.parse(json['joinedAt'] as String),
        activatedAt: json['activatedAt'] != null
            ? DateTime.parse(json['activatedAt'] as String)
            : null,
      );

  bool get isActive => status == 'ACTIVE' || status == 'REWARDED';
}

class PointTransaction {
  final String id;
  final int delta;
  final String type;
  final String? note;
  final DateTime createdAt;

  const PointTransaction({
    required this.id,
    required this.delta,
    required this.type,
    this.note,
    required this.createdAt,
  });

  factory PointTransaction.fromJson(Map<String, dynamic> json) => PointTransaction(
        id: json['id'] as String,
        delta: json['delta'] as int? ?? 0,
        type: json['type'] as String? ?? '',
        note: json['note'] as String?,
        createdAt: DateTime.parse(json['createdAt'] as String),
      );

  bool get isEarned => delta > 0;

  String get typeLabel {
    switch (type) {
      case 'REFERRAL_FIRST_PAYMENT': return '推荐首次订阅奖励';
      case 'REFERRAL_RECURRING':     return '推荐续订奖励';
      case 'REFERRAL_L2':            return '二级推荐奖励';
      case 'REFERRAL_WELCOME':       return '加入欢迎积分';
      case 'REDEMPTION_QUOTA':       return '兑换使用配额';
      case 'REDEMPTION_UNLOCK':      return '兑换智能体解锁';
      case 'ADMIN_GRANT':            return '平台赠送';
      case 'EXPIRY':                 return '积分过期';
      default:                       return type;
    }
  }
}

class RewardItem {
  final String id;
  final int amountCents;
  final String amountFormatted;
  final String rewardType;
  final String triggerType;
  final String status;  // PENDING | APPLIED | EXPIRED
  final String? sourceInvoiceId;
  final int? recurringMonth;
  final DateTime createdAt;
  final DateTime? appliedAt;

  const RewardItem({
    required this.id,
    required this.amountCents,
    required this.amountFormatted,
    required this.rewardType,
    required this.triggerType,
    required this.status,
    this.sourceInvoiceId,
    this.recurringMonth,
    required this.createdAt,
    this.appliedAt,
  });

  factory RewardItem.fromJson(Map<String, dynamic> json) => RewardItem(
        id: json['id'] as String,
        amountCents: json['amountCents'] as int? ?? 0,
        amountFormatted: json['amountFormatted'] as String? ?? '\$0.00',
        rewardType: json['rewardType'] as String? ?? 'CREDIT',
        triggerType: json['triggerType'] as String? ?? 'FIRST_PAYMENT',
        status: json['status'] as String? ?? 'PENDING',
        sourceInvoiceId: json['sourceInvoiceId'] as String?,
        recurringMonth: json['recurringMonth'] as int?,
        createdAt: DateTime.parse(json['createdAt'] as String),
        appliedAt: json['appliedAt'] != null
            ? DateTime.parse(json['appliedAt'] as String)
            : null,
      );

  String get triggerLabel =>
      triggerType == 'FIRST_PAYMENT' ? '首次付款奖励' : '续订奖励(第${recurringMonth ?? 1}月)';
}