限制套餐具体到 档位

internal/logic/public/order/getDiscount.go

@@ -13,3 +13,19 @@ func getDiscount(discounts []types.SubscribeDiscount, inputMonths int64) float64
 
 	return finalDiscount / float64(100)
 }
+
+// isNewUserOnlyForQuantity checks whether the matched discount tier has new_user_only enabled.
+func isNewUserOnlyForQuantity(discounts []types.SubscribeDiscount, inputQuantity int64) bool {
+	var finalDiscount float64 = 100
+	var newUserOnly bool
+
+	for _, discount := range discounts {
+		if inputQuantity >= discount.Quantity && discount.Discount < finalDiscount {
+			finalDiscount = discount.Discount
+			newUserOnly = discount.NewUserOnly
+		}
+	}
+
+	return newUserOnly
+}
+