import '../core/config/app_constants.dart';

class LicenseInfo {
  final int id;
  final String type; // trial | monthly | annual | lifetime
  final bool isActive;
  final int maxDevices;
  final DateTime? expiresAt;
  final String phase; // normal | grace | readonly | locked

  const LicenseInfo({
    required this.id,
    required this.type,
    required this.isActive,
    required this.maxDevices,
    required this.phase,
    this.expiresAt,
  });

  factory LicenseInfo.fromJson(Map<String, dynamic> json) {
    return LicenseInfo(
      id: (json['id'] as num?)?.toInt() ?? 0,
      type: json['type'] as String? ?? 'trial',
      isActive: json['is_active'] as bool? ?? false,
      maxDevices: (json['max_devices'] as num?)?.toInt() ??
          AppConstants.defaultMaxDevices,
      expiresAt: json['expires_at'] != null
          ? DateTime.tryParse(json['expires_at'] as String)
          : null,
      phase: json['phase'] as String? ?? 'normal',
    );
  }

  String get typeLabel {
    switch (type) {
      case 'monthly':
        return '月度授权';
      case 'annual':
        return '年度授权';
      case 'lifetime':
        return '永久授权';
      default:
        return '试用版';
    }
  }

  bool get isExpired => expiresAt != null && DateTime.now().isAfter(expiresAt!);

  int? get daysRemaining {
    if (expiresAt == null) return null;
    final diff = expiresAt!.difference(DateTime.now()).inDays;
    return diff < 0 ? 0 : diff;
  }

  /// 已过期天数（未过期或永久授权返回 0）。
  int get daysExpired {
    if (expiresAt == null) return 0;
    final diff = DateTime.now().difference(expiresAt!).inDays;
    return diff < 0 ? 0 : diff;
  }

  bool get isReadOnlyPhase => phase == 'readonly' || phase == 'locked';
  bool get isLockedPhase => phase == 'locked';
  bool get needsAttention =>
      phase == 'grace' || phase == 'readonly' || phase == 'locked';
}

/// POST /license/purchase 响应：pay 收银台跳转信息。
class PurchaseOrder {
  final String payUrl;
  final String outTradeNo;
  final String amount; // 实付金额（pay 侧权威价，如 "2999.00"）
  final String subject;

  const PurchaseOrder({
    required this.payUrl,
    required this.outTradeNo,
    required this.amount,
    required this.subject,
  });

  factory PurchaseOrder.fromJson(Map<String, dynamic> json) => PurchaseOrder(
        payUrl: json['pay_url'] as String? ?? '',
        outTradeNo: json['out_trade_no'] as String? ?? '',
        amount: json['amount'] as String? ?? '',
        subject: json['subject'] as String? ?? '',
      );
}

/// GET /license/purchase/:otn 响应：购买单状态（到账轮询用）。
class PurchaseStatusInfo {
  final String outTradeNo;
  final String status; // pending | paid | failed
  final String amount;
  final DateTime? paidAt;
  final DateTime? expiresAt; // 续期后的门店授权到期时间（仅 paid 时有值）

  const PurchaseStatusInfo({
    required this.outTradeNo,
    required this.status,
    required this.amount,
    this.paidAt,
    this.expiresAt,
  });

  bool get isPaid => status == 'paid';

  factory PurchaseStatusInfo.fromJson(Map<String, dynamic> json) =>
      PurchaseStatusInfo(
        outTradeNo: json['out_trade_no'] as String? ?? '',
        status: json['status'] as String? ?? 'pending',
        amount: json['amount'] as String? ?? '',
        paidAt: json['paid_at'] != null
            ? DateTime.tryParse(json['paid_at'] as String)
            : null,
        expiresAt: json['expires_at'] != null
            ? DateTime.tryParse(json['expires_at'] as String)
            : null,
      );
}