private bool ExactChangeOnly()
{
var availableProductPrices = DispenserChannels
.Where(i => i.Inventory > 0)
.Select(i => i.Price)
.Distinct();
var acceptedCoinValues = CoinTubes
.Select(i => i.Spec.Value)
.Distinct()
.OrderBy(i => i);
var smallestAcceptedCoinValue = acceptedCoinValues.Min();
var largestAcceptedCoinValue = acceptedCoinValues.Max();
// There is a product that is being sold for a multiple of a
// smaller denomination than the smallest accepted denomination
if (availableProductPrices.Any(i => i % smallestAcceptedCoinValue > 0))
{
return(true);
}
foreach (var price in availableProductPrices)
{
foreach (var coinValue in acceptedCoinValues)
{
if (price % coinValue > 0 && !CanDispenseCoins(price % coinValue))
{
return(true);
}
}
}
return(false);
}
public CoinSpecification IdentifyCoin(double massGrams, double diameterMillimeters)
{
foreach (var coinSpec in CoinTubes.Select(i => i.Spec).Distinct())
{
if (coinSpec.MassGrams == massGrams && coinSpec.DiameterMillimeters == diameterMillimeters)
{
return(coinSpec);
}
}
return(null);
}
public void AddCoinToAvailableCoinTube(CoinSpecification coinType)
{
for (var i = 0; i < CoinTubes.Count(); i++)
{
var coinTube = CoinTubes[i];
if (coinTube.Spec == coinType && coinTube.CountInTube < coinTube.Capacity)
{
// Direct inserted coin to the available coin tube
coinTube.CountInTube++;
return;
}
}
// Direct inserted coin to cash box
}
public void DispenseCoins(decimal amount)
{
foreach (var coinTube in CoinTubes
.Where(i => i.CountInTube > 0 && i.Spec.Value <= amount)
.OrderByDescending(i => i.Spec.Value)
.ThenByDescending(i => i.CountInTube))
{
while (amount > 0m && coinTube.CountInTube > 0 &&
amount >= coinTube.Spec.Value)
{
amount -= coinTube.Spec.Value;
AmountInserted -= coinTube.Spec.Value;
coinTube.CountInTube--;
OnCoinDispensed(new CoinDispensedEventArgs(coinTube.Spec));
}
}
}
public bool CanDispenseCoins(decimal amount)
{
foreach (var coinTube in CoinTubes
.Where(i => i.CountInTube > 0 && i.Spec.Value <= amount)
.OrderByDescending(i => i.Spec.Value)
.ThenByDescending(i => i.CountInTube))
{
var virtualCountInTube = coinTube.CountInTube;
while (amount > 0m && virtualCountInTube > 0 &&
amount >= coinTube.Spec.Value)
{
amount -= coinTube.Spec.Value;
virtualCountInTube--;
}
}
return(amount == 0m);
}
public int GetCoinInventory(CoinSpecification coinType)
{
return(CoinTubes.Where(i => i.Spec == coinType)
.Sum(i => i.CountInTube));
}