public decimal GetSum()
{
var plainSum = GetPlainSum();
var discount = CalculateDiscounts(Discounts.Where(x => x.DiscountType == (int)DiscountType.Percent), plainSum);
var tax = CalculateTax(plainSum, discount);
var services = CalculateServices(TaxServices, plainSum - discount, tax);
return((plainSum - discount + services + tax) - Discounts.Where(x => x.DiscountType != (int)DiscountType.Percent).Sum(x => x.Amount));
}
private void CalculateDiscount()
{
//total discount from giftcards
decimal giftCardDiscount = Discounts.Where(x => x.GetType() == typeof(GiftVoucher)).Sum(x => x.Amount);
//we know we can only have one offer voucher, so SingleOrDefault will either return the voucher, or null
OfferVoucher voucher = (OfferVoucher)Discounts.SingleOrDefault(x => x.GetType() == typeof(OfferVoucher));
if (voucher == null)
{
DiscountTotal = giftCardDiscount;
return;
}
decimal voucherDiscount = 0;
//if the voucher is applied to a certain category, return the sum of products in the category, else return the sum of all the products in the basket.
decimal voucherCategoryProductTotal = voucher.Category != null?Products.Where(x => x.Product.Category == voucher.Category).Sum(x => x.Total) : SubTotal;
voucherDiscount = voucherCategoryProductTotal > voucher.Amount ? voucher.Amount : voucherCategoryProductTotal;
//if the discountable total is less than the discounts added, then the max discount is used - this is because giftcards aren't available for discount.
DiscountTotal = DiscountableTotal < giftCardDiscount + voucherDiscount ? DiscountableTotal : giftCardDiscount + voucherDiscount;
}
public DiscountRuleDTO GetDiscount(decimal subtotal)
{
return(Discounts.Where(d => d.CheckRange(subtotal)).FirstOrDefault());
}
public Discount GetAppliedDiscount()
{
return(HasDiscount ? Discounts.Where(x => x.EndDate >= DateTime.Now).MinBy(x => x.CalculateDiscountedPrice(Price)) : null);
}
public decimal GetRoundingTotal()
{
return(CalculateDiscounts(Discounts.Where(x => x.DiscountType != (int)DiscountType.Percent), 0));
}
public decimal GetDiscountTotal()
{
decimal sum = GetPlainSum();
return(CalculateDiscounts(Discounts.Where(x => x.DiscountType == (int)DiscountType.Percent), sum));
}