public Denomination Calculate()
{
base.Validate(RequireAmount);
var denominationWithdrawn = new Denomination()
{
DenominationValue = DenominationToProcess, Value = DenominationToProcess
};
IDenominationLogic logic = new DenominationLogic();
var denominations = logic.GetDenominationValue();
var denominationBeingProcess = denominations.Where(x => x.DenominationValue == DenominationToProcess).SingleOrDefault();
var quantity = (int)(RequireAmount / DenominationToProcess);
// make sure we have enough notes
if (quantity > denominationBeingProcess.Quantity)
{
quantity = denominationBeingProcess.Quantity;
}
if (quantity > 0)
{
// dispense the denomination
denominationWithdrawn.Quantity = quantity;
logic.UpdateDenomination(DenominationToProcess, -quantity);
}
return(denominationWithdrawn);
}
public void Validate(double requireAmount)
{
if (requireAmount < 0)
{
throw new ArgumentException("amount less than zero", "requireAmount");
}
IDenominationLogic logic = new DenominationLogic();
var total = logic.GetDenominationTotal();
if (requireAmount > total)
{
throw new ArgumentException("you don't have enough money to fulfill your request", "requireAmount");
}
}
public List <Denomination> WithdrawMoney(double requireAmount)
{
double amountRemaining = requireAmount;
var denominationsWithdrawn = new List <Denomination>();
IDenominationLogic logic = new DenominationLogic();
var denominations = logic.GetDenominationValue().OrderByDescending(o => o.DenominationValue);
denominationsWithdrawn = denominations.Select(d => {
var den = new ProcessDenomination(d.DenominationValue, amountRemaining).Calculate();
amountRemaining = amountRemaining - (den.DenominationValue * den.Quantity);
return(den);
}).Where(r => r.Quantity > 0).ToList();
return(denominationsWithdrawn);
}
