private (Amount paid, Money remaining) Pay(Money money, Amount remainder)
{
var now = Timestamp.Now;
switch (money)
{
case Amount amt when amt.Currency != remainder.Currency:
return(Amount.Zero(remainder.Currency), money);
case Amount amt when amt.Value <= remainder.Value:
return(new Amount(amt.Currency, amt.Value), Amount.Zero(amt.Currency));
case GiftCard gift when gift.Currency != remainder.Currency:
return(Amount.Zero(remainder.Currency), gift);
case GiftCard gift when gift.ValidBefore.CompareTo(now) < 0:
return(Amount.Zero(remainder.Currency), Amount.Zero(gift.Currency));
case GiftCard gift when gift.Value <= remainder.Value:
return(new Amount(gift.Currency, gift.Value), Amount.Zero(gift.Currency));
case Amount amt:
return(remainder, amt.Subtract(remainder));
case BankCard card when card.ValidBefore.CompareTo(now) < 0:
return(Amount.Zero(remainder.Currency), Amount.Zero(remainder.Currency));
case BankCard _:
return(remainder, money);
default:
throw new ArgumentException("Money type not supported.");
}
}
public override Tuple <Amount, Money> Take(Currency currency, decimal amount) => Tuple.Create(Amount.Zero(currency), (Money)this);
public override Money On(Timestamp time) =>
time.CompareTo(this.ValidBefore) >= 0
? Amount.Zero(base.Currency)
: this;
