private void Buy()
{
if (_salesperson.CurrentStock.Count() <= 0)
{
_consoleView.DisplayInventoryError();
return;
}
Product selectedProduct = _consoleView.DisplayGetNumberOfUnitsToBuy(_salesperson.CurrentStock);
_salesperson.CurrentStock.Find(x => x.Type == selectedProduct.Type).AddProducts(selectedProduct.NumberOfUnits);
_salesperson.Logs.Push(DateTime.Now + " ... Purchased " + selectedProduct.NumberOfUnits + " " + selectedProduct.Type + "!");
}