package wek3;

import java.util.*;
    /**
     * Codes demonstrates the use of queues to encrypt and decrypt messages.
     *
     * @author Lewis and Chase
     * @version 4.0
     */
    public class Codes
    {
        /**
         * Encode and decode a message using a key of values stored in
         * a queue.
         */
        public static void main(String[] args)
        {
            int[] key = {5, 12, -3, 8, -9, 4, 10};
            Integer keyValue;
            String encoded = "", decoded = "";
            String message = "All programmers are playwrights and all " +
                    "computers are lousy actors.";
            Queue<Integer> encodingQueue = new LinkedList<Integer>();
            Queue<Integer> decodingQueue = new LinkedList<Integer>();

            // load key queues
            for (int scan = 0; scan < key.length; scan++)
            {
                encodingQueue.add(key[scan]);
                decodingQueue.add(key[scan]);
            }

            // encode message
            for (int scan = 0; scan < message.length(); scan++)
            {
                keyValue = encodingQueue.remove();
                encoded += (char) (message.charAt(scan) + keyValue);
                encodingQueue.add(keyValue);
            }

            System.out.println ("Encoded Message:\n" + encoded + "\n");

            // decode message
            for (int scan = 0; scan < encoded.length(); scan++)
            {
                keyValue = decodingQueue.remove();
                decoded += (char) (encoded.charAt(scan) - keyValue);
                decodingQueue.add(keyValue);
            }

            System.out.println ("Decoded Message:\n" + decoded);
        }
    }