public async Task <Guid> AddCartItem(AddProductToCartDto item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
var product = await _context.Products.FirstOrDefaultAsync(c => c.Id == item.ProductId);
if (product == null)
{
throw new EntityNotFoundException($"Product with id:{item.ProductId} doesn't exist");
}
var cart = await GetCartById(item.CartId);
if (cart == null)
{
cart = await CreateNewCart(item);
}
else
{
await AddItemToExistingCart(item, cart);
}
await _context.SaveChangesAsync();
return(cart.CartId);
}
public async Task <IActionResult> Add(AddProductToCartDto productCartDto)
{
try
{
var cartId = await _cartCrudService.AddCartItem(productCartDto);
return(Ok(cartId));
}
catch (ArgumentNullException e)
{
return(BadRequest(e.Message));
}
catch (EntityNotFoundException e)
{
return(BadRequest(e.Message));
}
}
private async Task AddItemToExistingCart(AddProductToCartDto item, DataAccess.Entities.Cart cart)
{
var cartItem = cart.CartItems.FirstOrDefault(c => c.ProductId == item.ProductId);
if (cartItem != null)
{
cartItem.Quantity++;
_context.CartItems.Update(cartItem);
}
else
{
cartItem = new CartItem()
{
CartId = cart.Id,
ProductId = item.ProductId,
ForBonusPoints = item.ForBonusPoints,
Quantity = 1
};
await _context.CartItems.AddAsync(cartItem);
}
}
private async Task <DataAccess.Entities.Cart> CreateNewCart(AddProductToCartDto item)
{
var cart = new DataAccess.Entities.Cart()
{
CartId = item.CartId
};
var result = await _context.Carts.AddAsync(cart);
await _context.SaveChangesAsync();
var cartItem = new CartItem()
{
CartId = result.Entity.Id,
ProductId = item.ProductId,
ForBonusPoints = item.ForBonusPoints,
Quantity = 1
};
await _context.CartItems.AddAsync(cartItem);
return(cart);
}