class Coupon {
  final String code;
  final String? description;
  final String discountType; // fixed_cart, percent, fixed_product, percent_product
  final String amount;
  final bool isValid;
  final String? errorMessage;

  Coupon({
    required this.code,
    this.description,
    required this.discountType,
    required this.amount,
    this.isValid = false,
    this.errorMessage,
  });

  factory Coupon.fromJson(Map<String, dynamic> json) {
    return Coupon(
      code: json['code'] ?? '',
      description: json['description'],
      discountType: json['discount_type'] ?? 'fixed_cart',
      amount: json['amount'] ?? '0',
      isValid: json['is_valid'] ?? false,
      errorMessage: json['error_message'],
    );
  }

  String get discountDisplay {
    switch (discountType) {
      case 'percent':
      case 'percent_product':
        return '$amount%';
      case 'fixed_cart':
      case 'fixed_product':
        return '$amount €';
      default:
        return amount;
    }
  }
}