public Machine()
{
Products = new List<Product>();
Random m = new Random();//создание экземпляра класса Рандом для создания произвольного кол-ва монет разного номинала
Money = new Balance(m.Next(1, 1000));
//Money = new Balance(0); //для тестирования случая, когда автомат не может выдать деньги
}
/// <summary>
/// Calculates change
/// </summary>
/// <param name="money">input amount of money - dictionary where key - denomination, value - units amount</param>
/// <param name="sum">sum that should be composed</param>
/// <returns>dictionary where key - denomination and value - amount</returns>
public IDictionary<decimal, int> Calculate(IDictionary<decimal, int> money, decimal sum)
{
if (money == null)
{
throw new ArgumentNullException("money");
}
var balance = new Balance(money);
var result = new Stack<decimal>();
var currentSum = 0m;
var denomination = balance.PopTheSameOrLess(balance.GetMaxAvailable());
while (currentSum != sum)
{
if (denomination == 0 && result.Count == 0)
{
break;
}
if (currentSum + denomination <= sum && denomination > 0)
{
result.Push(denomination);
currentSum += denomination;
denomination = balance.PopTheSameOrLess(denomination);
}
else if (denomination > 0)
{
balance.Push(denomination);
denomination = balance.PopLessThat(denomination);
}
else
{
while (denomination == 0 && result.Count > 0)
{
var previous = result.Pop();
currentSum -= previous;
balance.Push(previous);
denomination = balance.PopLessThat(previous);
}
}
}
return result.GroupBy(item => item).ToDictionary(g => g.Key, g => g.Count());
}
public Client()
{
Money = new Balance(150);
}
public CurrentTransaction()
{
Money = new Balance(0);
}