/// 充值套餐（来自后端 GET /api/v1/plans，价格以服务端 config.yml 为准）
class Plan {
  final String id;
  final int days;
  final int priceYuan;

  const Plan({
    required this.id,
    required this.days,
    required this.priceYuan,
  });

  /// 展示名由天数派生（接口无 label 字段）
  String get label => '$days天';

  factory Plan.fromJson(Map<String, dynamic> json) => Plan(
        id: json['planId'] as String,
        days: json['days'] as int,
        priceYuan: (json['priceCents'] as num) ~/ 100,
      );
}

/// 支付渠道
enum PayChannel { wechat, alipay }

/// 订单（由后端创建）
class Order {
  final String orderId;

  /// 微信支付参数（prepay_id / partner_id / nonce_str / time_stamp / sign 等）
  final Map<String, dynamic> wechatParams;

  /// 支付宝订单串（orderStr）
  final String? alipayOrderStr;

  const Order({
    required this.orderId,
    this.wechatParams = const {},
    this.alipayOrderStr,
  });
}

/// 授权状态（服务端为准）
class LicenseStatus {
  final bool active;
  final DateTime? expiresAt;

  const LicenseStatus({required this.active, this.expiresAt});

  bool get isActive => active && (expiresAt?.isAfter(DateTime.now()) ?? false);

  factory LicenseStatus.fromJson(Map<String, dynamic> json) => LicenseStatus(
        active: json['active'] == true,
        expiresAt: json['expiresAt'] != null
            ? DateTime.tryParse(json['expiresAt'] as String)
            : null,
      );
}

/// 支付结果
class PayResult {
  final bool success;
  final String? message;
  final String? orderId;

  const PayResult({required this.success, this.message, this.orderId});
}