public void ValidateAndPutCoinsOnDeposit(int denomination, int amount)
{
ValidateDenomination(denomination);
var newSet = new CoinSet {
Denomination = denomination, Amount = amount
};
var existingSet = _deposit.SingleOrDefault(s => s.Denomination == denomination);
if (existingSet == default)
{
_deposit.Add(newSet);
}
else
{
existingSet.Amount += amount;
}
AddDomainEvent(new DepositChangedEvent(_deposit.Sum(c => c.Amount * c.Denomination).ToAmounDenominationString()));
}
private IEnumerable <CoinSet> CalculateChange(int amount)
{
var minimumChange = new List <CoinSet>();
for (var i = _denominations.Length - 1; i >= 0; i--)
{
var currentDenomination = _denominations[i];
while (amount >= currentDenomination)
{
amount -= currentDenomination;
var coinsOfDenomination = minimumChange.SingleOrDefault(c => c.Denomination == currentDenomination);
if (coinsOfDenomination == default)
{
coinsOfDenomination = new CoinSet {
Denomination = currentDenomination, Amount = 0
};
minimumChange.Add(coinsOfDenomination);
}
coinsOfDenomination.Amount++;
}
}
return(minimumChange);
}