public ProductCart CalculateCartAmount(ProductCart cart)
{
decimal total = default;
var items = cart.Items.Where(x => x.Product.SKU == PromotedProductSku).ToList();
var totalQuantityToProcess = items.Sum(x => x.Quantity);
if (items != null && totalQuantityToProcess >= PromotionQuantity)
{
var numberOfSets = (int)Math.Floor((decimal)totalQuantityToProcess / PromotionQuantity);
total = numberOfSets * PromotionAmount;
int processedProductCount = (numberOfSets * PromotionQuantity);
var unprocessedQuantity = totalQuantityToProcess - processedProductCount;
total += unprocessedQuantity * items.FirstOrDefault().Product.Price;
return(new ProductCart(cart.Items.Except(items).ToList(), cart.Total + total));
}
return(cart);
}
public ProductCart CalculateCartAmount(ProductCart cart)
{
throw new NotImplementedException();
}