import java.util.Arrays;

/**
 * Ponitfex class for encrypting/decrypting strings.
 * @author cs416
 * @version 2
 */
public class Pontifex {

    private Integer[] deck;

    /**
     * Initializes the Pontifex object with the provided interger array
     * representing the deck of cards.
     * @param deck The deck of cards used for the Pontifex algorithm
     */
    public Pontifex(Integer[] deck) {
        this.deck = deck;
    }

    /**
     * encrypts the message using the initial deck.
     * @param message The message to encrypt
     * @return String The encrypted meaage
     */
    public String encrypt(String message) {
	throw new UnsupportedOperationException("TO BE IMPLEMENTED");
    }

    /**
     * decrypts the message using the deck.
     * @param message The message to decrypt
     * @return String the decrypted message
     */
    public String decrypt(String message) {
	throw new UnsupportedOperationException("TO BE IMPLEMENTED");
    }

     /**
     * generates the keystream value from the deck configuration.
     * @return int The keystream value
     */
    public int keystream() {
	throw new UnsupportedOperationException("TO BE IMPLEMENTED");
    }

    /**
     * @return String that represents the deck of cards.
     */
    public String toString() {
        return Arrays.toString(deck);
    }

    /**
     * main function used for testing purposes.
     * @param args command line arguments
     */
    public static void main(String[] args) {

        Pontifex p = new Pontifex(new Integer[]{19, 18, 21, 25,
            6, 17, 15, 27, 14, 22, 28, 20, 5, 12, 2, 13, 9, 16, 3, 7, 10, 23, 8,
            24, 4, 11, 1O, 26});
        System.out.println(p.encrypt("hello"));

        p = new Pontifex(new Integer[]{22, 8, 25,
            23, 15, 5, 1, 12, 13, 26, 9, 18, 14, 6, 28, 19, 21, 17, 20, 3, 10,
            16, 27, 24, 11, 7, 4, 2});
        System.out.println(p.decrypt("UVCCU MNUFA"));
    }
}