calc_tatoal_discount.go

func  calcTotalDiscount(currentCart *commercetools.Cart, response *cart_service.CartPriceSummeryResponse) {
	if len(currentCart.DiscountCodes) != 0 {
		for _, lineItem := range currentCart.LineItems {
			for _, discountedPrice := range lineItem.DiscountedPricePerQuantity {
				response.TotalDiscount += centAmount(discountedPrice.DiscountedPrice.Value) * int32(discountedPrice.Quantity)
			}
		}
		for _,code := range currentCart.DiscountCodes {
			if code.State == commercetools.DiscountCodeStateMatchesCart {
				for _, cartDiscount := range code.DiscountCode.Obj.CartDiscounts {
					switch v := cartDiscount.Obj.Value.(type) {
					case commercetools.CartDiscountValueAbsolute:
						for _, m := range v.Money {
							response.TotalDiscount += centAmount(m)
						}
					default:

					}
				}
			}
		}
	}
}