public ShoppingCartItem AddProductToCart(string shoppingCartId, Product product)
{
lock (_lock)
{
ShoppingCart shoppingCart = GetById(shoppingCartId);
if (shoppingCart == null)
{
shoppingCart = new ShoppingCart(new List<ShoppingCartItem>())
{
ShoppingCartId = shoppingCartId,
Currency = "USD",
TaxRate = .09
};
_shoppingCarts[shoppingCartId] = shoppingCart;
}
ShoppingCartItem item = shoppingCart.ShoppingCartItems.FirstOrDefault(c => c.Product.ProductNumber == product.ProductNumber);
if (item == null)
{
item = new ShoppingCartItem
{
Id = product.ProductNumber,
Product = product,
Quantity = 1,
Currency = shoppingCart.Currency
};
shoppingCart.ShoppingCartItems.Add(item);
}
else
{
item.Quantity++;
}
UpdatePrices(shoppingCart);
return item;
}
}
public bool RemoveItemFromCart(ShoppingCart shoppingCart, string itemId)
{
lock (_lock)
{
if (shoppingCart == null)
{
throw new ArgumentNullException("shoppingCart");
}
ShoppingCartItem item = shoppingCart.ShoppingCartItems.FirstOrDefault(i => i.Id == itemId);
bool itemRemoved = shoppingCart.ShoppingCartItems.Remove(item);
if (itemRemoved)
{
UpdatePrices(shoppingCart);
}
return itemRemoved;
}
}
private static void UpdatePrices(ShoppingCart shoppingCart)
{
double fullPrice = 0, discount = 0;
foreach (var shoppingCartItem in shoppingCart.ShoppingCartItems)
{
fullPrice += shoppingCartItem.Product.ListPrice * shoppingCartItem.Quantity;
shoppingCart.FullPrice = fullPrice;
shoppingCart.TotalDiscount = discount;
shoppingCart.TotalPrice = fullPrice - discount;
}
}
bool IShoppingCartRepository.RemoveItemFromCart(ShoppingCart shoppingCart, string itemId)
{
return RemoveItemFromCartDelegate(shoppingCart, itemId);
}