tax calculations

cmd/cart/cart-grain.go

@@ -70,6 +70,7 @@ type CartGrain struct {
 	TotalPrice        int64              `json:"totalPrice"`
 	TotalTax          int64              `json:"totalTax"`
 	TotalDiscount     int64              `json:"totalDiscount"`
+	TotalDiscountTax  int64              `json:"totalDiscountTax"`
 	Deliveries        []*CartDelivery    `json:"deliveries,omitempty"`
 	Processing        bool               `json:"processing"`
 	PaymentInProgress bool               `json:"paymentInProgress"`
@@ -248,6 +249,7 @@ func (c *CartGrain) UpdateTotals() {
 	c.TotalPrice = 0
 	c.TotalTax = 0
 	c.TotalDiscount = 0
+	c.TotalDiscountTax = 0
 	for _, item := range c.Items {
 		rowTotal := item.Price * int64(item.Quantity)
 		rowTax := int64(item.Tax) * int64(item.Quantity)
@@ -257,10 +259,15 @@ func (c *CartGrain) UpdateTotals() {
 		c.TotalTax += rowTax
 		itemDiff := max(0, item.OrgPrice-item.Price)
 		c.TotalDiscount += itemDiff * int64(item.Quantity)
+		c.TotalDiscountTax += GetTaxAmount(c.TotalDiscount, 2500)
 	}
 	for _, delivery := range c.Deliveries {
 		c.TotalPrice += delivery.Price
 		c.TotalTax += GetTaxAmount(delivery.Price, 2500)
 	}
-
+	for _, voucher := range c.Vouchers {
+		c.TotalPrice -= voucher.Value
+		c.TotalTax -= voucher.TaxValue
+		c.TotalDiscountTax += voucher.TaxValue
+	}
 }