/// <summary>
/// Make a product sale
/// </summary>
/// <param name="ProductId">The id of the product object</param>
/// <returns>List of coins that is changed or the coins the customer has</returns>
public List <Coin> MakeSale(int ProductId)
{
try
{
Product product = Products.Find(x => x.Id == ProductId);
int TotalCents = CustomerCoins.Sum(x => x.TotalCents);
bool SaleSuccess = false;
if (CanMakeSale(ProductId))
{
//reset change
ChangeCoins = new List <Coin>();
//reduce product
Products.Find(x => x.Id == ProductId).Stock--;
//add to user coins to machine
CustomerCoins.ForEach(coin =>
{
CoinInsertMachine(coin);
});
//check if change is needed
if (TotalCents >= product.Price)
{
ChangeCoins = CalculateChange(TotalCents - product.Price);
//remove coins from current stash
ChangeCoins.ForEach(coin =>
{
RemoveCoin(coin);
});
//return change
}
//reset usercoins sale is make
CustomerCoins = new List <Coin>();
SaleSuccess = true;
}
if (SaleSuccess)
{
// return change
return(ChangeCoins);
}
else
{
//cancel
return(CustomerCoins);
}
}
catch (Exception ex)
{
//Error return coins
Console.WriteLine(ex.Message);
return(CustomerCoins);
}
}
/// <summary>
/// Sum value of customer inserted coins in cents
/// </summary>
/// <returns></returns>
public int CustomerCoinsValue()
{
if (CustomerCoins.Count == 0)
{
return(0);
}
else
{
//sum the accumulated total cents per coin value
return(CustomerCoins.Sum(x => x.TotalCents));
}
}
/// <summary>
/// Called when a customer inserts a coin
/// </summary>
/// <param name="coin"></param>
/// <returns>Total inserted value in cents</returns>
public int CoinInsertCustomer(Coin coin)
{
if (CustomerCoins.Count == 0)
{
CustomerCoins.Add(coin);
}
else
{
if (CustomerCoins.Where(x => x.Cents == coin.Cents).Count() == 0)
{
CustomerCoins.Add(coin);
}
else
{
CustomerCoins.Where(x => x.Cents == coin.Cents).Single().Quantity++;
}
}
//reset
ChangeCoins = new List <Coin>();
return(CustomerCoinsValue());
}
