static void Main(string[] args)
{
var atm = new ATM();
atm.LoadCash();
IHandler handler = new VerifyCashHandler
{
Next = new IssueCashHandler
{
Next = new ResultInformHandler()
}
};
while (true)
{
Console.Write("Enter sum: ");
var sum = int.Parse(Console.ReadLine());
handler.Handle(atm, new Request(sum));
}
}
public override void Handle(ATM atm, Request request)
{
if (request.Sum <= 0 || request.Sum > atm.Sum)
{
Console.WriteLine("Cash cannot be issued");
return;
}
var sum = request.Sum;
foreach (var banknote in atm.Cash
.Where(x => x.Value > 0)
.OrderByDescending(x => x.Key))
{
var amount = sum / banknote.Key;
if (amount == 0)
{
continue;
}
if (amount > banknote.Value)
{
amount = banknote.Value;
}
sum -= banknote.Key * amount;
request.CashToIssue.Add(banknote.Key, amount);
}
if (sum != 0)
{
Console.WriteLine("Cash cannot be issued");
request.CashToIssue.Clear();
return;
}
base.Handle(atm, request);
}
public virtual void Handle(ATM atm, Request request)
{
Next?.Handle(atm, request);
}
