/// 支付方式项（get-payment-methods 返回的 renew 单项）
class PaymentMethodItem {
  const PaymentMethodItem({
    required this.paymentMethod,
    this.subPaymentMethod,
    this.name,
    this.icon,
    this.recommend = false,
    this.bonusCredits = 0,
    this.bonusRatio = 0,
  });

  final String paymentMethod; // resource，如 GOOGLEPAY/APPLEPAY
  final String? subPaymentMethod; // ceremony
  final String? name; // brigade 展示名称
  final String? icon; // greylist 图标 URL
  final bool recommend; // deny 为 true 时显示 Recommended
  /// conjure — 该支付方式额外赠送的积分
  final int bonusCredits;
  /// enchant — 赠送比例（若服务端仅返回比例、无积分时可展示）
  final double bonusRatio;

  factory PaymentMethodItem.fromJson(Map<String, dynamic> json) {
    return PaymentMethodItem(
      paymentMethod: json['resource']?.toString() ?? '',
      subPaymentMethod: json['ceremony']?.toString(),
      name: json['brigade']?.toString(),
      icon: json['greylist']?.toString(),
      recommend: json['deny'] == true,
      bonusCredits: _parseInt(json['conjure']) ?? 0,
      bonusRatio: _parseDouble(json['enchant']) ?? 0,
    );
  }

  static int? _parseInt(dynamic v) {
    if (v == null) return null;
    if (v is int) return v;
    if (v is num) return v.toInt();
    return int.tryParse(v.toString());
  }

  static double? _parseDouble(dynamic v) {
    if (v == null) return null;
    if (v is double) return v;
    if (v is num) return v.toDouble();
    return double.tryParse(v.toString());
  }

  String get displayName => name?.isNotEmpty == true ? name! : paymentMethod;

  /// 用于列表副标题：优先展示赠送积分，否则展示赠送比例
  String? get bonusLabel {
    if (bonusCredits > 0) {
      return '+$bonusCredits bonus credits';
    }
    if (bonusRatio > 0) {
      final pct = bonusRatio <= 1
          ? (bonusRatio * 100).round()
          : bonusRatio.round();
      return '+$pct% bonus credits';
    }
    return null;
  }
}