public IActionResult AddToCart(int productId)
{
int cartCount;
try
{
// if user is not logged in, update cart data in Session State as
// a Jsonified CartList object
if (!User.Identity.IsAuthenticated)
{
var cartList = HttpContext.Session.GetJson <CartListViewModel>("cart");
// check if "cart" exists in Session data
if (cartList != null)
{
cartList.AddToCart(new Cart {
ProductId = productId, Qty = 1
});
}
// create new new CartList object if there isn't one in session
else
{
cartList = new CartListViewModel();
cartList.AddToCart(new Cart {
ProductId = productId, Qty = 1
});
}
// update "cart" Session data
HttpContext.Session.SetJson("cart", cartList);
// get latest "cartCount"
cartCount = cartList.CartCount;
// for debugging, to delete
//foreach (Cart c in cartList.List)
//{
// Debug.WriteLine($"Prod: {c.ProductId} - {c.Qty}");
//}
//Debug.WriteLine("Cart count: " + cartCount);
}
// else user is logged in, update cart data in SQL db Cart table
else
{
string userId = User.FindFirst("userId").Value;
var cart = db.Carts.FirstOrDefault(c => c.ProductId == productId && c.UserId == userId);
// check if cart item for this product exists
if (cart != null)
{
cart.Qty += 1;
}
// create new Cart object if cart item doesnt exist
else
{
cart = new Cart()
{
UserId = userId, ProductId = productId, Qty = 1
};
db.Carts.Add(cart);
}
db.SaveChanges();
// get latest "cartCount"
cartCount = db.Users.FirstOrDefault(u => u.Id == userId).Carts.Sum(c => c.Qty);
// for debugging, to delete
//foreach (var c in db.Users.FirstOrDefault(u => u.Id == userId).Carts)
//{
// Debug.WriteLine($"Prod: {c.ProductId} - {c.Qty}");
//}
//Debug.WriteLine("Cart count: " + cartCount);
}
HttpContext.Session.SetInt32("cartCount", cartCount);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
_logger.LogError(ex, $"Error adding to cart for prod Id {productId}");
return(Json(new
{
success = false
}));
}
return(Json(new { success = true, cartCount = cartCount }));
}
