public OperationResult AddProductToCart(string userId, int productId, int selectedQuantity)
{
Product productToAdd = _productRepository.GetProductById(productId);
if (selectedQuantity > productToAdd.Quantity)
{
return(OperationResult.Error("Error! Selected quantity is less than state of the warehouse."));
}
if (selectedQuantity <= 0)
{
return(OperationResult.Error("Error! Selected quantity is too little."));
}
var order = GetCartOrRestoreToCart(userId);
if (order == null)
{
order = CreateNewOrder(userId);
}
var listOfOrderPositions = _orderRepository.GetOrderById(order.OrderId).OrderPositions;
var existedProductInOrder = listOfOrderPositions
.Where(o => o.ProductId == productId)
.SingleOrDefault();
if (existedProductInOrder == null)
{
OrderPosition orderPosition = new OrderPosition
{
NameOfProduct = productToAdd.Name,
Price = productToAdd.Price,
Quantity = selectedQuantity,
TotalPrice = selectedQuantity * productToAdd.Price,
ProductId = productId,
OrderId = order.OrderId
};
_orderRepository.AddOrderPosition(orderPosition);
}
else
{
existedProductInOrder.Quantity = existedProductInOrder.Quantity + selectedQuantity;
existedProductInOrder.TotalPrice = existedProductInOrder.Quantity * existedProductInOrder.Price;
}
var product = _productRepository.GetProductById(productId);
product.Quantity = product.Quantity - selectedQuantity;
_productRepository.UpdateProduct(product);
_orderRepository.Submit();
return(OperationResult.Success());
}
