import java.applet.*;
import java.awt.*;
import java.awt.event.*;


import java.awt.Color;
import javax.swing.JApplet;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class trick extends JApplet implements ActionListener{
    public static int line = 1;
    public static int char_per_line = 5;
    private TextField[] txtF = new TextField[16];
    private JTextArea input = new JTextArea(line, char_per_line);
    private JTextArea input2 = new JTextArea(line, char_per_line);
    private JTextArea error = new JTextArea(5, 60);
    public static String finals;
    public void init(){
    Container display = getContentPane();
    display.setBackground(Color.ORANGE);
    display.setLayout(new FlowLayout());
    JLabel intro = new JLabel("CHEEZEE'S BINARY REGISTER\n");
    intro.setForeground(Color.RED);
    display.add(intro);


    ButtonGroup RadioGroup = new ButtonGroup();
    ButtonGroup RadioGroup2 = new ButtonGroup();
    JRadioButton add = new JRadioButton("ADD");
    RadioGroup.add(add);
    add.addActionListener(this);

    JRadioButton sub = new JRadioButton("SUBTRACT");
    RadioGroup.add(sub);
    sub.addActionListener(this);


    JRadioButton Do = new JRadioButton("DO");
    RadioGroup2.add(Do);
    Do.addActionListener(this);

    JRadioButton clear = new JRadioButton("CLEAR");
    RadioGroup2.add(clear);
    clear.addActionListener(this);


    JLabel Enter = new JLabel("Enter a binary number");
    display.add(Enter);
    display.add(input);
    display.add(add);
    display.add(sub);
    JLabel Enter2 = new JLabel("Enter another binary number");
    display.add(Enter2);
    display.add(input2);

    display.add(Do);

    display.add(clear);
    display.add(error);
    for (int y = 0; y < 16; y++){
    txtF[y] = new TextField();
    }
     display.add(txtF[0]);
     display.add(txtF[1]);
     display.add(txtF[2]);
     display.add(txtF[3]);
     display.add(txtF[4]);
     display.add(txtF[5]);
     display.add(txtF[6]);
     display.add(txtF[7]);
     display.add(txtF[8]);
     display.add(txtF[9]);
     display.add(txtF[10]);
     display.add(txtF[11]);
     display.add(txtF[12]);
     display.add(txtF[13]);
     display.add(txtF[14]);
     display.add(txtF[15]);

    }


    public void actionPerformed(ActionEvent e){
        String click = e.getActionCommand();
        if (click.equals("ADD")){
        String one = input.getText();
        long chan = Long.parseLong(one);
        long rem;
        while (chan > 0){
            rem = chan % 10;
            chan = chan/10;
            if (rem != 0 && rem != 1){
                error.setText("Please make sure you enter a binary number");
            }
        }
        int dec = Integer.parseInt(one,2);
        String two = input2.getText();
        long chan2 = Long.parseLong(two);
        long rem2;
        while (chan > 0){
            rem2 = chan2 % 10;
            chan2 = chan2/10;
            if (rem2 != 0 && rem2 != 1){
                error.setText("Please make sure you enter a binary number");
            }
        }
        int dec2 = Integer.parseInt(two,2);
        int ans = dec + dec2;
        if (ans > 32768){
            error.setText("Overflow the convert only has a limit of 16 bits");
        }
        String runz = "";
            while (ans > 0){
            int y = ans%2;
            runz = runz + y + "";
            ans = ans/2;
            }
            finals = new StringBuffer(runz).reverse().toString();
            for (int u = 0; u < 16; u++){
                txtF[u].setText("");
            }

        }
        else if(click.equals("SUBTRACT")){
        String one = input.getText();
        long chan = Long.parseLong(one);
        long rem;
        while (chan > 0){
            rem = chan % 10;
            chan = chan/10;
            if (rem != 0 && rem != 1){
                error.setText("Please make sure you enter a binary number");
            }
        }
        int dec = Integer.parseInt(one,2);
        String two = input2.getText();
        long chan2 = Long.parseLong(two);
        long rem2;
        while (chan > 0){
            rem2 = chan2 % 10;
            chan2 = chan2/10;
            if (rem2 != 0 && rem2 != 1){
                error.setText("Please make sure you enter a binary number");
            }
        }
        int dec2 = Integer.parseInt(two,2);
        int ans = dec - dec2;
        if(ans <0){
            error.setText("Underflow make sure you are not producing a neagtive number!");}
        if (ans > 32768){
            error.setText("Overflow the convert only has a limit of 16 bits");}
        String runz = "";
            while (ans > 0){
            int y = ans%2;
            runz = runz + y + "";
            ans = ans/2;
            }
            finals = new StringBuffer(runz).reverse().toString();
            for (int u = 0; u < 16; u++){
                txtF[u].setText("");
            }
        }
        else if (click.equals("DO")){
            int size = finals.length();
            for (int y = 0;y < size;y++ ){
                String single = Character.toString(finals.charAt(y));
                txtF[y].setText(single);
            }
        }
        else if (click.equals("CLEAR")){
            input.setText("");
            input2.setText("");
            for (int r = 0; r < 16; r++){
                txtF[r].setText("");
            }
            error.setText("");
        }

}

}