import java.util.Scanner;

public class VendingMachineLoopCode
{
    public static void main(String[] args)
    {
        Scanner myInput = new Scanner(System.in);

        // declaration of variables
        // String userCoinInput = ""; // NOT needed in this scope. Moved.
        // char coinChoice = '0'; // NOT needed in this scope. Moved.
        double userCredit = 0.0;
        // double change = 0.0; // NOT needed in this scope (or at all). Moved (Removed)
        // double coinReturn = 0.0; // Not needed at all. Removed

        final double FINAL_CREDIT = 2.75;
        final double TOONIE = 2.00;
        final double LOONIE = 1.00;
        final double QUARTER = 0.25;

        System.out.println("Vending Machine Simulation");
        System.out.println("--------------------------");

        System.out.println("\nThis vending machine dispenses drinks for $2.75 each. Please insert only toonies, loonies, or quarters!");

        do
        {
            System.out.print("\nEnter 'T' for toonie, 'L' for loonie, 'Q' for quarter, or 'C' to cancel: ");

            // userCoinInput = myInput.nextLine();
            // Get the user answer and only accept the first character
            // coinChoice = userCoinInput.toUpperCase().charAt(0);

            // Both userCoinInput and coinChoice only need to exist in this scope
            // This would also be an acceptable place to daisy-chain into the following:
            // char coinChoice = myInput.nextLine().toUpperCase().chartAt(0);

            String userCoinInput = myInput.nextLine();
            char coinChoice = userCoinInput.toUpperCase().charAt(0);

            // These if-elseif-elseif-else are good cases for switches. Not required, just commenting.

            if(coinChoice == 'T')
            {
                userCredit += TOONIE;
                System.out.println("Toonie inserted. Credit: $" + userCredit);
            }
            else if(coinChoice == 'L')
            {
                userCredit += LOONIE;
                System.out.println("Loonie inserted. Credit: $" + userCredit);
            }
            else if (coinChoice == 'Q')
            {
                userCredit += QUARTER;
                System.out.println("Quarter inserted. Credit: $" + userCredit);
            }
            else if (coinChoice == 'C')
            {
                // coinReturn = userCredit;
                // userCredit -= userCredit;
                // System.out.println("\nPurchase cancelled. $" + coinReturn + " returned via the coin return slot. Credit: " + userCredit);

                System.out.print("\nPurchase cancelled. $" + userCredit + " returned via the coin return slot");
                userCredit = 0;
                System.out.println("Credit: " + userCredit);

                break;
            }
            else
            {
                System.out.println("That coin was rejected. Please insert the specified coins only!");
            }

        } while (userCredit < FINAL_CREDIT);

        if (coinChoice != 'C')
        {
            System.out.println("\nThank you. Your drink has been dispensed.");

            // change = userCredit - FINAL_CREDIT;
            double change = userCredit - FINAL_CREDIT; // Now I know this variable is only used here
            System.out.println("\nIf this machine gave change you'd be getting back $" + change);
        }
        else
        {
            System.out.println();
        }

        // housekeeping
        myInput.close();

    }       // end main
}       // end class