package CIS115;
import java.util.Scanner;

public class SentinelMenu {

    public static void main(String[] args) {
        int sum = 0;
        int count = 0;
        int x;
        String ans;
        ans = promptString("Have a number?");

        while (ans.equals("y")) {
            x = promptInt("What number?");
            count = count + 1;
            sum = sum + x;
            // annoying extra input each time
            ans = promptString("More numbers?");
        }
        System.out.println("average: " + sum / count);

        // double input version
        sum = 0; // reset
        count = 0;
        final int STOP = -989; // only works if this is invalid as data value
        System.out.println("Enter " + STOP + " to quit");

        // input before loop
        x = promptInt("What number?");
        while (x != STOP) {
            count = count + 1;
            sum = sum + x;
            // input at bottom of loop
            x = promptInt("What number?");
        }
        System.out.println("average: " + sum / count);

        // single input version
        sum = 0; // reset
        count = 0;
        // final int STOP = -989; // already did this in main
        System.out.println("Enter " + STOP + " to quit");
        x = 0; // anything but STOP
        while (x != STOP) {
            // read at top of loop          
            x = promptInt("What number?");
            if (x != STOP) {
                count = count + 1;
                sum = sum + x;
            }
        }
        System.out.println("average: " + sum / count);

        double balance = 800.80;
        int menuOp = -1;
        while (menuOp != 0) {
            System.out.println("0 Quit");
            System.out.println("1 Show Balance");
            System.out.println("2 Deposit");
            System.out.println("3 Withdraw");
            menuOp = promptInt("Choice?");

            switch (menuOp) {
                case 1:
                    System.out.println("$" + balance);
                    break;
                case 2:
                    balance = balance + 5;
                    break;
                case 3:
                    balance = balance - 5;
                    break;
            }
        }

        double checking = 189.99;
        double savings = 2068.77;
        menuOp = -1; // resetting from last example
        while (menuOp != 0) {
            System.out.println("0 Quit");
            System.out.println("1 Show Balances");
            System.out.println("2 Deposit");
            System.out.println("3 Withdraw");
            System.out.println("4 Transfer Menu");
            menuOp = promptInt("Choice?");
            if (menuOp == 1) {
                System.out.println("Checking: $" + checking);
                System.out.println("Savings: $" + savings);
            } else if (menuOp == 2) {
                checking = checking + 5;
                System.out.println("Deposit, new balance is $" + checking);
            } else if (menuOp == 3) {
                checking = checking - 5;
                System.out.println("Withdraw, new balance is $" + checking);
            } else if (menuOp == 4) {

                int tMenuOp = -1;
                while (tMenuOp != 0) {
                    System.out.println("0 Return to main menu");
                    System.out.println("1 Transfer from Savings");
                    System.out.println("2 Transfer to Savings");
                    tMenuOp = promptInt("Choice?");
                    if (tMenuOp == 1) {
                        savings = savings - 10;
                        checking = checking + 10;
                        System.out.println("Transfer, new checking balance is $" + checking);
                        System.out.println("Transfer, new savings balance is $" + savings);
                    } else if (tMenuOp == 2) {
                        savings = savings + 10;
                        checking = checking - 10;
                        System.out.println("Transfer, new checking balance is $" + checking);
                        System.out.println("Transfer, new savings balance is $" + savings);
                    }
                } // done transfer menu
            }
        } // done main menu

        menuOp = -1; // resetting from last example
        final int MSTOP = 0; // constant value to stop choosing
        while (menuOp != 0) {
            System.out.println("0 Quit");
            System.out.println("1 Sum");
            System.out.println("2 Product");
            menuOp = promptInt("Choice?");

            if (menuOp == 1) {
                System.out.println("SUM calculator");
                sum = 0; // reset
                int user = promptInt("enter value or 0 to quit");
                while (user != MSTOP) {
                    sum = sum + user;
                    user = promptInt("enter value or 0 to quit");
                } // done sum values
                System.out.println("sum was " + sum);
            } else if (menuOp == 2) {
                System.out.println("PRODUCT calculator");
                int product = 1;
                int user = -1;
                while (user != MSTOP) {
                    user = promptInt("enter value or 0 to quit");
                    if (user != MSTOP) {
                        product = product * user;
                    }
                }// done product values
                System.out.println("product was " + product);
            }
        }
    }

    /*    Simple Utility methods that prompt the user and return input
          If you enter the wrong type of input, the program will end
          with an error!
     */
    // utility for reading in integer input
    public static int promptInt(String promptText) {
        System.out.print(promptText + " ");
        Scanner scan = new Scanner(System.in);
        int response = scan.nextInt();
        return response;
    }

    // utility for reading in double input
    public static double promptDouble(String promptText) {
        System.out.print(promptText + " ");
        Scanner scan = new Scanner(System.in);
        double response = scan.nextDouble();
        return response;
    }

    // utility for reading in String input
    public static String promptString(String promptText) {
        System.out.print(promptText + " ");
        Scanner scan = new Scanner(System.in);
        String response = scan.nextLine();
        return response;
    }

    // utility for reading in boolean input
    public static boolean promptBoolean(String promptText) {
        System.out.print(promptText + " (y/n) ");
        Scanner scan = new Scanner(System.in);
        String response = scan.nextLine();
        return response.equalsIgnoreCase("y");
    }

}