private (Amount paid, Money remaining) Pay(Money money, Amount remainder)
{
Timestamp 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 (Amount paid, Money remaining) Pay(Amount expense)
{
if (expense.Currency != this.Currency)
{
return(Amount.Zero(expense.Currency), this);
}
if (expense.Value >= this.Value)
{
return(this, Amount.Zero(this.Currency));
}
return(expense, this.Subtract(expense));
}
public (Amount paid, Wallet remaining) Pay(Amount expense)
{
Amount remainder = expense;
Amount paid = Amount.Zero(expense.Currency);
IList <Money> rests = new List <Money>();
foreach (Money money in this.Moneys)
{
(Amount stepPaid, Money stepRemaining) = this.Pay(money, remainder);
paid = paid.Add(stepPaid);
rests.Add(stepRemaining);
}
return(paid, new Wallet(rests.Where(item => !(item is Empty))));
}
public static (Amount paid, Money remaining) Pay(this Money money, Amount expense)
{
Timestamp now = Timestamp.Now;
switch (money)
{
case Amount amt when amt.Currency != expense.Currency:
return(Amount.Zero(expense.Currency), money);
case Amount amt when amt.Value <= expense.Value:
return(amt, Amount.Zero(amt.Currency));
case GiftCard gift when gift.Currency != expense.Currency:
return(Amount.Zero(expense.Currency), gift);
case GiftCard gift when gift.ValidBefore.CompareTo(now) < 0:
return(Amount.Zero(expense.Currency), Amount.Zero(gift.Currency));
case GiftCard gift when gift.Value <= expense.Value:
return(new Amount(gift.Currency, gift.Value),
Amount.Zero(gift.Currency));
case Empty _:
return(Amount.Zero(expense.Currency), money);
case Amount amt:
return(expense, amt.Subtract(expense));
case BankCard card when card.ValidBefore.CompareTo(now) < 0:
return(Amount.Zero(expense.Currency),
Amount.Zero(expense.Currency));
case BankCard _:
return(expense, money);
default:
throw new ArgumentException(
$"Unsupported money type {money.GetType().Name}.");
}
}
public override Tuple <Amount, Money> Take(decimal amount) => Tuple.Create(Amount.Zero(base.Currency), (Money)this);
public override Money On(Timestamp time) =>
time.CompareTo(this.ValidBefore) >= 0
? Amount.Zero(base.Currency)
: this;