public decimal?CalculateTotal()
{
var calculateResult = _simpleCalculator.TakeSuitableProducts(_pricing,
_packsCalculator.TakeSuitableProducts(_pricing,
new CalculateState(0m, _products))
);
ResetInitialState();
// Calculators cannot check all products using current price list
if (calculateResult.LeftProducts.Any())
{
return(null);
}
return(calculateResult.Money);
}