public async Task <Cart> CalculateCartAsync(
TaxType taxType, ICatalogGateway catalogGateway,
IPromoGateway promoGateway, IShippingGateway shippingGateway)
{
if (CartItems != null && CartItems?.Count() > 0)
{
CartItemTotal = 0.0D;
foreach (var cartItem in CartItems)
{
var product = await catalogGateway.GetProductByIdAsync(cartItem.Product.ProductId);
if (product == null)
{
throw new Exception("Could not find product.");
}
cartItem
.FillUpProductInfo(product.Name, product.Price, product.Desc)
.ChangePrice(product.Price);
CartItemPromoSavings = CartItemPromoSavings + cartItem.PromoSavings * cartItem.Quantity;
CartItemTotal = CartItemTotal + cartItem.Product.Price * cartItem.Quantity;
}
shippingGateway.CalculateShipping(this);
}
promoGateway.ApplyShippingPromotions(this);
switch (taxType)
{
case TaxType.NoTax:
CartTotal = CartItemTotal + ShippingTotal;
break;
case TaxType.TenPercentage:
var cartTotal = CartItemTotal + ShippingTotal;
CartTotal = cartTotal * 10 / 100 + cartTotal;
break;
default:
throw new ArgumentOutOfRangeException(nameof(taxType), taxType, null);
}
return(this);
}
public Domain.Cart Execute(Domain.Cart cart)
{
if (cart == null)
{
throw new Exception("Cart is null.");
}
if (cart.CartItems != null && cart.CartItems?.Count() > 0)
{
cart.CartItemTotal = 0;
foreach (CartItem item in cart.CartItems)
{
cart.CartItemPromoSavings = cart.CartItemPromoSavings + (item.PromoSavings * item.Quantity);
cart.CartItemTotal = cart.CartItemTotal + (item.Product.Price * item.Quantity);
}
cart = _shippingGateway.CalculateShipping(cart);
}
cart = _promoGateway.ApplyShippingPromotions(cart);
cart.CartTotal = AddTaxCost(cart.CartItemTotal + cart.ShippingTotal);
return(cart);
}