/// <summary>
/// Add or update the quantity of a given product into a cart
/// Also creates a new cart if none exists
/// </summary>
/// <param name="cartId"></param>
/// <param name="item"></param>
/// <param name="error"></param>
/// <returns></returns>
public Cart SetCartItem(string cartId, CartItem item, out CartOperationError error)
{
error = new CartOperationError();
if (item.Quantity <= 0)
{
error.StatusCode = 400;
error.Message = "Invalid quantity";
return(null);
}
if (!memoryCache.TryGetValue(string.Format(CartCacheKeyFormat, cartId), out Cart cart))
{
cart = CreateCart();
}
var quantity = item.Quantity;
if (cart.CartItems.TryGetValue(item.ProductId, out var existingItem))
{
quantity -= existingItem.Quantity;
}
if (!productCacheService.TryUpdateRetained(quantity, item.ProductId, out var product, out error))
{
error.StatusCode = 400;
error.Message = "Failed to add product to cart";
return(null);
}
cart.CartItems[item.ProductId] = item;
StoreCartToCache(string.Format(CartCacheKeyFormat, cart.Id), cart);
hubContext.Clients.All.SendAsync(AppEvents.ProductUpdated, product).Wait();
return(cart);
}
/// <summary>
/// Removes an item for a given cart
/// </summary>
/// <param name="cartId"></param>
/// <param name="productId"></param>
/// <param name="error"></param>
/// <returns></returns>
public Cart RemoveCartItem(string cartId, int productId, out CartOperationError error)
{
error = new CartOperationError();
if (!memoryCache.TryGetValue(string.Format(CartCacheKeyFormat, cartId), out Cart cart))
{
error.StatusCode = 404;
error.Message = "Cart not found";
return(null);
}
if (!cart.CartItems.TryGetValue(productId, out var existingItem))
{
error.StatusCode = 400;
error.Message = "Product not added to cart";
return(null);
}
if (!productCacheService.TryUpdateRetained(-existingItem.Quantity, productId, out var product, out error))
{
return(null);
}
cart.CartItems.Remove(productId);
StoreCartToCache(string.Format(CartCacheKeyFormat, cart.Id), cart);
hubContext.Clients?.All?.SendAsync(AppEvents.ProductUpdated, product);
return(cart);
}
/// <summary>
/// Clears the items of a given cart
/// </summary>
/// <param name="cartId"></param>
/// <returns></returns>
public Cart ClearCart(string cartId, out CartOperationError error)
{
var cacheKey = CartCacheKey(cartId);
error = new CartOperationError();
if (!memoryCache.TryGetValue(cacheKey, out Cart cart))
{
error.StatusCode = 404;
error.Message = "Cart not found";
return(null);
}
foreach (var retainedItem in cart.CartItems)
{
if (!this.productCacheService.TryUpdateRetained(-retainedItem.Value.Quantity, retainedItem.Key,
out var product, out error))
{
Log.Error("Failed to clear cart " + cartId);
Log.Error(error.Message);
return(null);
}
this.hubContext.Clients?.All?.SendAsync(AppEvents.ProductUpdated, product).Wait();
}
cart.CartItems.Clear();
StoreCartToCache(cacheKey, cart);
return(cart);
}
