import java.util.*;
public class Atm{

static Hashtable password = new Hashtable();
static Hashtable balance = new Hashtable();
static Scanner scanner = new Scanner(System.in);

public static void main(String[] args){
run();
}

public static void run(){
    displaySplashScreen();
    splashChoice();
}

public static void splashChoice(){
int choice;
choice = scanner.nextInt();

if(choice == 1){
    cls();
    existingUser();
}
else if(choice == 2){
    cls();
    newUser();
}
else{
    System.out.println();
    System.out.print("ERROR: Invalid option. Please enter a valid option: ");
    splashChoice();
}
}

public static void newUser(){
boolean usernameChosen = false;
boolean passwordChosen = false;
String desiredUsername, desiredPassword, passwordChecker;
int initialBalance;
System.out.println();
    while(!usernameChosen){
        System.out.println("New User");
        System.out.println();
        System.out.println("Type 'back' at any time to return to the main screen. ");
        System.out.println();
        System.out.print("Please enter desired username: ");
        desiredUsername = scanner.next();

        if(desiredUsername.equals("back")){
            run();
        }

        if (password.isEmpty() || !password.containsKey(desiredUsername)){
            while(!passwordChosen){
                System.out.print("Please type a password: ");
                desiredPassword = scanner.next();
                if(desiredPassword.equals("back")){ run(); }
                System.out.print("Please retype the password: ");
                passwordChecker = scanner.next();
                if(passwordChecker.equals("back")){ run(); }
                if(desiredPassword.equals(passwordChecker)){
                    password.put(desiredUsername, desiredPassword);
                    passwordChosen = true;
                    }
                else{
                    System.out.println("The passwords did not match! Please try again.");
                }
            }

            System.out.println();
            System.out.println("Your account has been created.");
            cls();
            System.out.print("Enter initial balance: $");
            initialBalance = scanner.nextInt();
            balance.put(desiredUsername, initialBalance);
            usernameChosen = true;
        }
        else{
            System.out.println("This username is already taken.");
        }
    }
    cls();
    run();
}

public static void existingUser(){
String username, inputPassword;
boolean correctPassword = false;
int userBalance;
username = getUsername();
getPassword(username);
}

private static getPassword(username){
String inputPassword;
    System.out.print("Password: ");
    inputPassword = scanner.next();
    if(inputPassword.equals("back")){ run(); }
                else{

                    if (inputPassword.equals(password.get(username))){
                    }
                    else{
                        System.out.println("Invalid password. ");
                    }
                }
    }
    else{
        cls();
        System.out.print("Invalid username. ");
        existingUser();
    }

}
}*/
}

private static String getUsername(){
String username;
cls();
System.out.println("Existing User");
System.out.println();
System.out.println("Type 'back' at any time to return to the main screen. ");
System.out.println();
System.out.print("Username: ");
username = scanner.next();
if(username.equals("back"){
run();
}
else if(password.containsKey(username){
return username;
}
else{
System.out.println("Invalid Username.");
System.out.println();
getUsername();
}
}

private static void cls(){
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
}

private static void displaySplashScreen(){
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println();System.out.println();System.out.println();System.out.println();System.out.println();
System.out.println("                           AA    TTTTTTTTTT  MM          MM");
System.out.println("                           AA    TTTTTTTTTT  MM          MM");
System.out.println("                         AA  AA      TT      MMMM      MMMM");
System.out.println("                         AA  AA      TT      MMMM      MMMM");
System.out.println("                         AAAAAA      TT      MM  MM  MM  MM");
System.out.println("                         AAAAAA      TT      MM  MM  MM  MM");
System.out.println("                       AA      AA    TT      MM    MM    MM");
System.out.println("                       AA      AA    TT      MM    MM    MM");
System.out.println("                       AA      AA    TT      MM          MM");
System.out.println("                       AA      AA    TT      MM          MM");
System.out.println();
System.out.println("                                    Welcome!");
System.out.println();
System.out.println("                            Please select an option:");
System.out.println("                        1. Existing User     2. New User");
System.out.println();
System.out.print("                                 Enter 1 or 2: ");
}
}