/// <summary>
/// Adds new item to the cart. If the product exists increases its quantity
/// </summary>
/// <param name="productsApi">Products Api Gateway</param>
/// <param name="newCartItem">NewCartItem to be added</param>
internal void AddToCart(IProductsApiConnector productsApi, NewCartItem newCartItem)
{
if (productsApi == null)
{
throw new ArgumentNullException(nameof(productsApi));
}
if (newCartItem.UserId != this.UserId)
{
throw new ArgumentException(
"Supplied cartItem has a different user then this user cart",
nameof(newCartItem));
}
// If the product is already in the cart, there's no need to check for existence from api.
bool newProduct = false;
if (!this.items.TryGetValue(newCartItem.ProductId, out UserCartItem userCartItem))
{
userCartItem = InitializeUserCartItem(productsApi, newCartItem.ProductId);
newProduct = true;
}
userCartItem.IncreaseQuantity(productsApi, newCartItem.Quantity);
if (newProduct)
{
this.items.Add(userCartItem.ProductId, userCartItem);
}
}
public CartItemService(
IProductsApiConnector productsApi,
IUserApiConnector userApi,
ICartItemDataGateway dataGateway)
{
this.productsApi = productsApi;
this.userApi = userApi;
this.dataGateway = dataGateway;
}
private static UserCartItem InitializeUserCartItem(
IProductsApiConnector productsApi,
int productId)
{
if (!productsApi.ProductExists(productId))
{
throw new CartException(
CartErrorCode.InvalidProduct,
"Invalid product");
}
return(new UserCartItem(productId));
}
