private void InvokeUserCommand(string commandString)
{
UserCommand command = new UserCommand(commandString, DashSystem);
if (command.IsUserInfo())
{
UI.DisplayUserInfo(command.User);
}
else if (command.IsSinglePurchase())
{
BuyTransaction transaction = DashSystem.CreateBuyTransaction(command.User, command.Product);
DashSystem.ExecuteTransaction(transaction);
UI.DisplayUserBuysProduct(transaction);
}
else if (command.IsMultiPurchase())
{
BuyMultipleProducts(command);
}
else
{
UI.DisplayTooManyArgumentsError(command.CommandString);
}
}
private void BuyMultipleProducts(UserCommand command)
{
BuyTransaction testTransaction = DashSystem.CreateBuyTransaction(command.User, command.Product);
decimal transactionPrice = Math.Abs(testTransaction.Amount) * command.PurchaseAmount;
if (transactionPrice < testTransaction.User.Balance || testTransaction.Product.CanBeBoughtOnCredit)
{
List <BuyTransaction> transactions = new List <BuyTransaction>();
for (int i = 0; i < command.PurchaseAmount; i++)
{
BuyTransaction transaction = DashSystem.CreateBuyTransaction(command.User, command.Product);
transactions.Add(transaction);
}
transactions.ForEach(x => x.Execute());
UI.DisplayUserBuysMultipleProducts(command.PurchaseAmount, transactions[0]);
}
else
{
throw new InsufficientCreditsException(
$"{testTransaction.User.Username} does not have enough credits ({testTransaction.User.Balance}) " +
$"to buy {command.PurchaseAmount} {testTransaction.Product.Name}. Price: {transactionPrice}");
}
}