/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package caesarcipher;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
 *
 * @author Vishal
 */
public class CaesarCipher {
    JPanel encrypt,decrypt,butPanel,butPanel2;
    JTextField txtEncrypt,txtDecrypt,txtEncrypt1,txtDecrypt1;
    JButton butEncrypt,butDecrypt;
    CaesarCipher(){
        JFrame main = new JFrame("Caesar Cipher - MyCoding.net");
        main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        encrypt = new JPanel(new GridLayout(3,1,1,1));
        decrypt = new JPanel(new GridLayout(3,1,1,1));
        butPanel = new JPanel();
        butPanel2 = new JPanel();
        butEncrypt = new JButton("Encrypt");
        butDecrypt = new JButton("Decrypt");
        main.setLocation(200, 300);
        main.setVisible(true);
        main.setLayout(new BorderLayout());
        main.add(encrypt,BorderLayout.EAST);
        main.add(decrypt, BorderLayout.WEST);
        txtEncrypt = new JTextField(15);
        txtDecrypt = new JTextField(15);
        txtEncrypt1 = new JTextField(15);
        txtDecrypt1 = new JTextField(15);
        decrypt.add(new JLabel("Plain Text: "));
        decrypt.add(txtEncrypt);
        decrypt.add(new JLabel("Cipher Text: "));
        decrypt.add(txtDecrypt);
        decrypt.add(butPanel);
        butPanel.add(butEncrypt);
        butEncrypt.addActionListener(new Convert());
        encrypt.add(new JLabel("Cipher Text: "));
        encrypt.add(txtDecrypt1);
        encrypt.add(new JLabel("Plain Text: "));
        encrypt.add(txtEncrypt1);
        encrypt.add(butPanel2);
        butPanel2.add(butDecrypt);
        butDecrypt.addActionListener(new Convert());
        main.pack();



    }    //End of Constructor
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        new CaesarCipher();
    }   //End main
    public class Convert implements ActionListener{
        char chars[] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
        String replace[] = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
        public void actionPerformed(ActionEvent ae){
            if(ae.getSource()== butEncrypt){
                char[] plain = txtEncrypt.getText().toLowerCase().toCharArray();
                String cipher = null;
                for(int i = 0;i<plain.length;i++){
                    for(int j = 0 ; j<26;j++){
                        if(j<=22){
                            if(plain[i]==chars[j]){
                                plain[i] = chars[j+3];
                                break;

                            }  
                        }//End nested If
                            else if(plain[i] == chars[j]){
                                plain[i] = chars [j-23];
                            }  //End else
                    } //End nested for loop
                } //End of For loop

                cipher = String.valueOf(plain);
                txtDecrypt.setText(cipher);

            }   //End if
            if(ae.getSource() == butDecrypt){  
                char[] cipher = txtDecrypt1.getText().toLowerCase().toCharArray();
                      for(int i = 0;i<cipher.length;i++){
                            for(int j = 0 ; j<26;j++){
                                if(j>=3 && cipher[i]==chars[j]){
                                    cipher[i] = chars[j-3];
                                    break;
                                }
                                    if(cipher[i] == chars[j] && j<3){
                                        System.out.println("Replacing "+cipher[i]+" by "+chars[23+j]+" "+j+23+"");
                                        cipher[i] = chars[23+j];
                                        break;
                          }  //End IF
                    } //End nested for loop
                } //End of For loop

                txtEncrypt1.setText(String.valueOf(cipher));

            }//End else   //Convert cipher text to plain text
        }//End actionPerformed
    } //End class Convertor
}  //End class CaesarCipher