public VendingResponse AcceptCoin(InputCoin coin)
{
VendingResponse response = new VendingResponse();
if (coin == null)
{
throw new ArgumentNullException("Coin parameter null!");
}
//check if the values correspond to an accepted coin
var currentCoin = _coinService.GetCoin(coin.Weight, coin.Diameter, coin.Thickness);
//not a valid coin
if (currentCoin == null)
{
response.Message = "Insert Coin";
response.IsRejectedCoin = true;
response.RejectedCoin = coin; //return rejected coin
return(response);
}
//valid coin
_cost += currentCoin.Value;
response.Message = _cost.ToString();
response.IsSuccess = true;
response.IsRejectedCoin = false;
return(response);
}
public VendingResponse SelectProduct(string code)
{
if (string.IsNullOrEmpty(code))
{
throw new ArgumentNullException("Code parameter empty!");
}
var response = new VendingResponse();
//check if the code is valid
//if no, return error object with details
var product = _productService.GetProduct(code);
//invalid code entered
if (product == null)
{
response.Message = "Invalid Product Selected. Please try again";
response.IsSuccess = false;
return(response);
}
//no coins entered, but selection pressed
if (_cost == 0)
{
//if exact change item, message = "exact change only"
response.Message = "Insert Coin";
response.IsSuccess = false;
return(response);
}
//entered coins less than cost
if (_cost < product.Price)
{
response.Message = string.Format("Price : {0}", product.Price);
response.IsSuccess = false;
return(response);
}
//all good, valid code and valid amount entered
var quantity = _productService.GetProductQuantity(code);
if (quantity > 0)
{
response.Message = "Thank You";
response.IsSuccess = true;
_productService.UpdateProductQuantity(code);
response.Change = MakeChange(Convert.ToDouble(_cost - product.Price));
_cost = 0.00m;
return(response);
}
response.Message = "SOLD OUT";
response.IsSuccess = false;
return(response);
}
static void WriteVendingResponseToScreen(VendingResponse response)
{
Console.WriteLine("Message : " + response.Message);
Console.WriteLine("IsRejectedCoin : " + response.IsRejectedCoin);
if (response.RejectedCoin != null)
{
Console.WriteLine("Coin Diameter: " + response.RejectedCoin.Diameter);
Console.WriteLine("Coin Weight: " + response.RejectedCoin.Weight);
Console.WriteLine("Coin Thickness: " + response.RejectedCoin.Thickness);
}
if (response.Change != null)
{
WriteItemChangeToScreen(response.Change);
}
Console.WriteLine("IsSuccess : " + response.IsSuccess);
}