elvis java 2

package railway;

import java.util.regex.Pattern;

import com.sun.org.apache.xml.internal.security.encryption.EncryptedKey;

import sun.applet.resources.MsgAppletViewer;

//import com.sun.java_cup.internal.runtime.Scanner;
import java.util.*;

public class Railwayproject {
    String msg = new String();
    //initalzing and making key and choice variables global
    int key = 0;
    int choice = 0;

    static Railwayproject r = new Railwayproject();
    //initializing array list varraribles
    //initializing top
    ArrayList<Character> top = new ArrayList<>();
    //initializing bot
    ArrayList<Character> bot = new ArrayList<>();
    //initializing encrypt
    ArrayList<Character> encrypt = new ArrayList<>();
    ArrayList<Character> encrypted = new ArrayList<>();
    ArrayList<Character> decrypted = new ArrayList<>();


    public static void main(String[] args) {
        //creating the title
        System.out.printf("%50s", "Welcome to Rail Fence Cipher!");
        //showing the users the options
        System.out.println("\n\nPlease select one of the following options:");
        System.out.println("");
        //1 is for encryption option
        System.out.println("1 - Encrypt a message");
        //2 is for decryption option
        System.out.println("2 - Decrypt a message");
        //3 is for brute force option
        System.out.println("3 - Brute force");


        //starts
        while (1 == 1) {
            if (r.messageControl(1))break;
        }



    }

    public boolean messageControl(int state) {
        //initializing scanner
        Scanner scan = new Scanner(System.in);
        //initializing boolean
        boolean bol = false;
        //initializing pattern
        Pattern p = Pattern.compile("[$&+,:;=\\\\?@#|/'<>.^*()%-]");

        if (state == 1) {
            if (choice == 1 ||choice == 2) {
                bol = false;
            }

            do{

                System.out.println("\nEnter your choice: ");
                try {
                choice = scan.nextInt();
                bol = (choice >= 1 && choice <= 3);

                //decrypt
                if(choice == 2 ) {
                    while (1 == 1) {
                        if (r.messageControl(2))break;
                    }
                    while (1 == 1) {
                        if (r.messageControl(3))break;
                    }
                    r.formatEncrypted(msg);
                    decrypted = r.decrypt(encrypted);
                }

                //encrypt
                if(choice == 1) {
                    while (1 == 1) {
                        if (r.messageControl(2))break;
                    }
                    while (1 == 1) {
                        if (r.messageControl(3))break;
                    }

                    //calling method zig zag
                    r.twoArray(top, bot);
                    //outputting results
                    System.out.println(top);
                    System.out.println( bot);
                    r.prepareEncrypt(top, bot, encrypt);

                    ArrayList<Character> encrypted = r.encrypt(encrypt);

                }

                if(choice == 3 ) {
                    //brute force stuff here
                    return true;
                }

                if (!bol) {
                System.out.println("Invalid choice! Please enter a number between 1-3.");
                return false;
                }

                }
                catch (Exception e){
                    System.out.println("Invalid key! Please enter an integer");
                    return false;
                }
                return true;
            }while (bol == false);
        }

        if(state == 2) {
            do{
                System.out.println("Enter your message: ");
                try {
                    msg = scan.nextLine();
                    if (msg.matches(".*\\d.*") || p.matcher(msg).find()) {
                            System.out.println("no nums or special chars");
                            return false;
                            }
                }
                catch (Exception e){
                    System.out.println("Invalid please enter a message");
                    return false;
                }
                return true;
            }while (bol == false);
        }

        if(state == 3) {
            do{
                System.out.println("\nEnter the key number : ");
                try {
                key = scan.nextInt();
                bol = (key >= 1 && key <= 26);
                if (!bol) {
                System.out.println("Invalid key! Please enter a number between 1-26.");
                return false;
                }
                }
                catch (InputMismatchException ex){
                    System.out.println("Invalid key! Please enter an integer");
                    return false;
                }
                return true;
            }while (bol == false);
        }

        return false;
    }


    public void twoArray(ArrayList<Character> top, ArrayList<Character> bot) {

        for (int i = 0; i <= msg.length() - 1; i++)
        {
            if (i == 0) {
                 top.add(msg.charAt(i));
            }

            else if (Character.isWhitespace(msg.charAt(i))) {
                if ((i & 1) == 0) {
                    top.add(' ');
                    top.add(' ');
                }
                else {
                    bot.add(' ');
                    bot.add(' ');
                }
            }

            else if ((i & 1) == 0) {
            top.add(' ');
            top.add(msg.charAt(i));
            }

            else {
            bot.add(' ');
            bot.add(msg.charAt(i));
            }
        }
        if (bot.size() > top.size())top.add(' ');
        else bot.add(' ');

    }




    public void prepareEncrypt(ArrayList<Character> top, ArrayList<Character> bot, ArrayList<Character> encrypt){

        for (int i = 0; i <= top.size() - 1; i++) {
            if (Character.isWhitespace(top.get(i))){
                if (Character.isWhitespace(bot.get(i))){
                        encrypt.add(' ');
                }
            }

            else {
                encrypt.add(top.get(i));
            }
        }


        for (int i = 0; i <= bot.size() - 1; i++) {
            if (Character.isWhitespace(bot.get(i))){
                if (Character.isWhitespace(top.get(i))){
                    encrypt.add(' ');
                }
            }

            else {
                encrypt.add(bot.get(i));
            }
            }


    }

    public ArrayList<Character> encrypt(ArrayList<Character> encrypt) {

        ArrayList<Character> encrypted = new ArrayList<>();

        for (int i=0; i<encrypt.size(); i++)
        {
           if (Character.isWhitespace(encrypt.get(i))){
               encrypted.add(' ');
           }
            else if (Character.isUpperCase(encrypt.get(i)))
            {
                char ch = (char)(((int)encrypt.get(i) +
                                  key - 65) % 26 + 65);
                encrypted.add(ch);
            }

           else
            {
                char ch = (char)(((int)encrypt.get(i) +
                                  key - 97) % 26 + 97);
                encrypted.add(ch);

            }


        }
        System.out.println("Your encrypted message is:");
        System.out.println(encrypted);
        return encrypted;
     }


    public void formatEncrypted(String msg) {
        for (int i = 0; i <= msg.length() - 1; i++) {
            if (Character.isWhitespace(msg.charAt(i))) {
                encrypted.add(' ');
                }
            else encrypted.add(msg.charAt(i));
        }
    }


    public ArrayList<Character> decrypt(ArrayList<Character> encrypted) {

        ArrayList<Character> decrypted = new ArrayList<>();

            if (top.size() > bot.size())bot.add(' ');
            else top.add(' ');
        for (int i=0; i<encrypted.size(); i++)
        {
           if (Character.isWhitespace(encrypted.get(i))){
               decrypted.add(' ');
           }
            else if (Character.isUpperCase(encrypted.get(i)))
            {
                char ch = (char)(((int)encrypted.get(i) +
                                  (-key) - 65) % 26 + 65);
                decrypted.add(ch);
            }

           else
            {
                char ch = (char)(((int)encrypted.get(i) +
                                  (-key) - 97) % 26 + 97);
                decrypted.add(ch);

            }


            }

        System.out.println("Your decrpyed message is:");
        System.out.println(decrypted);
        return decrypted;

    }

    public void formatMessage(ArrayList<Character> decrypted) {

    }

    }