public IActionResult UpdateCart([FromBody] CartUpdate cu)
{
int cartCount;
float subTotal;
float total = 0;
try
{
int productId; int qty;
productId = cu.ProductId; qty = cu.Qty;
Debug.WriteLine($"Prod ID:{productId}, Qty: {qty}");
if (qty <= 0)
{
return(Json(new
{
success = false
}));
}
// if user is not logged in, update cart data in Session State as a Jsonified dict
if (!User.Identity.IsAuthenticated)
{
var cartList = HttpContext.Session.GetJson <CartListViewModel>("cart");
// check if "cart" exists in Session data
if (cartList != null)
{
// update cart item qty if cart item exists, otherwise add new cart item
cartList.UpdateCart(new Cart {
ProductId = productId, Qty = qty
});
}
// create new cratList Dict if there isn't one in session
else
{
cartList = new CartListViewModel();
cartList.UpdateCart(new Cart {
ProductId = productId, Qty = qty
});
}
// update "cart" Session data
HttpContext.Session.SetJson("cart", cartList);
// get latest "cartCount" and set to Session data
cartCount = cartList.CartCount;
HttpContext.Session.SetInt32("cartCount", cartCount);
// for debugging, to delete
foreach (Cart c in cartList.List)
{
Debug.WriteLine($"Prod: {c.ProductId} - {c.Qty}");
}
Debug.WriteLine("Cart count: " + cartCount);
var prod = db.Products.FirstOrDefault(p => p.Id == productId);
subTotal = (prod.UnitPrice * qty) * (1 - prod.Discount);
foreach (Cart c in cartList.List)
{
var currProd = db.Products.FirstOrDefault(p => p.Id == c.ProductId);
var unitPrice = currProd.UnitPrice;
var discount = currProd.Discount;
total += unitPrice * c.Qty * (1 - discount);
}
}
// else user is logged in, update cart data in SQL db Cart table
else
{
string userId = User.FindFirst("userId").Value;
var cart = db.Carts.FirstOrDefault(c => c.ProductId == productId && c.UserId == userId);
// update cart item's qty if exists, otherwise add new Cart object
if (cart != null)
{
cart.Qty = qty;
}
else
{
cart = new Cart()
{
UserId = userId, ProductId = productId, Qty = qty
};
db.Carts.Add(cart);
}
db.SaveChanges();
// get latest "cartCount" and set to Session data
cartCount = db.Users.FirstOrDefault(u => u.Id == userId).Carts.Sum(c => c.Qty);
HttpContext.Session.SetInt32("cartCount", cartCount);
// for debugging, to delete
//foreach (Cart c in db.Users.FirstOrDefault(u => u.Id == userId).Carts)
//{
// Debug.WriteLine($"Prod: {c.ProductId} - {c.Qty}");
//}
//Debug.WriteLine("Cart count: " + cartCount);
subTotal = cart.Product.UnitPrice * qty * (1 - cart.Product.Discount);
foreach (Cart c in db.Users.FirstOrDefault(u => u.Id == userId).Carts)
{
total += c.Product.UnitPrice * c.Qty * (1 - c.Product.Discount);
}
}
HttpContext.Session.SetInt32("cartCount", cartCount);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
_logger.LogError(ex, $"Error updating cart for {cu}");
return(Json(new
{
success = false
}));
}
return(Json(new
{
success = true,
cartCount = cartCount,
subTotal = subTotal.ToString("S$ 0.00"),
total = total.ToString("S$ 0.00")
}));
}
