public string ListShoppingCart(int customerId)
{
FileStream locker = _FileLocker.LockObj(_customerAndCartLockerFile);
try
{
GetShoppingCarts();
var shoppingCart = ShoppingCarts.FirstOrDefault(s => s.CustomerId == customerId);
if (shoppingCart == null)
{
throw new InvalidOperationException("Cannot find the related shopping cart.");
}
if (shoppingCart.ProductItems == null || shoppingCart.ProductItems.Count <= 0)
{
throw new InvalidOperationException("There is nothing in the shopping cart.");
}
JsonSuperMarketRepository superMarketRepository = new JsonSuperMarketRepository();
List <string> results = new List <string>();
foreach (ProductItem s in shoppingCart.ProductItems)
{
var product = superMarketRepository.FindProduct(s.ProductId);
results.Add($"{product?.ToString() ?? "Product Info : Unknown"} Count = {s.Count}");
}
return(results.Count > 0
? string.Join(Environment.NewLine, results)
: "");
}
finally
{
_FileLocker.UnlockObj(locker);
}
}
public Receipt CheckOut(int customerId)
{
var locker = _FileLocker.LockObj(_customerAndCartLockerFile);
try
{
GetShoppingCarts();
var shoppingCart = ShoppingCarts.FirstOrDefault(s => s.CustomerId == customerId);
if (shoppingCart == null)
{
throw new InvalidOperationException("Cannot find the related shopping cart.");
}
if (shoppingCart.ProductItems == null || shoppingCart.ProductItems.Count <= 0)
{
throw new InvalidOperationException("There is nothing in the shopping cart.");
}
JsonSuperMarketRepository superMarketRepository = new JsonSuperMarketRepository();
var receipt = superMarketRepository.Checkout(shoppingCart.ProductItems);
shoppingCart.ProductItems.Clear();
_jsonHandler.SaveRecords(_shoppingCartJsonFile, ShoppingCarts);
return(receipt);
}
finally
{
_FileLocker.UnlockObj(locker);
}
}
public void AddToCart(int customerId, int productId, int count)
{
if (count <= 0)
{
throw new ArgumentOutOfRangeException($"Cannot add {count} product to cart.");
}
JsonSuperMarketRepository jsonSuperMarketRepository = new JsonSuperMarketRepository();
var stockCount = jsonSuperMarketRepository.GetStock(productId);
if (count > stockCount)
{
throw new InvalidOperationException($"Product {productId} is out of stock or not enough.");
}
FileStream locker = _FileLocker.LockObj(_customerAndCartLockerFile);
try
{
GetShoppingCarts();
var shoppingCart = ShoppingCarts.FirstOrDefault(s => s.CustomerId == customerId);
if (shoppingCart == null)
{
throw new InvalidOperationException("Cannot find the related shopping cart.");
}
var item = shoppingCart.ProductItems.FirstOrDefault(i => i.ProductId == productId);
if (item == null)
{
shoppingCart.ProductItems.Add(new ProductItem()
{
ProductId = productId, Count = count
});
}
else
{
item.Count += count;
}
_jsonHandler.SaveRecords(_shoppingCartJsonFile, ShoppingCarts);
}
finally
{
_FileLocker.UnlockObj(locker);
}
}
