import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class CalcListener implements  WindowListener, ActionListener  {
    private Frame f;
    private Panel p;
    private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
    private Button division;
    private Button plus;
    private Button minus;
    private Button multiply;
    private Button decPoint;
    private Button equal;
    private TextField tf;


    double c,n;
    String s1,s2,s3,s4,s5;

    public CalcListener () {
        f = new Frame("GuiCalculator");
        p = new Panel();
        tf = new TextField ();
        b0 = new Button("0"); b9 = new Button("9");
        b1 = new Button("1"); b2 = new Button("2");
        b3 = new Button("3"); b4 = new Button("4");
        b5 = new Button("5"); b6 = new Button("6");
        b7 = new Button("7"); b8 = new Button("8");
        division = new Button("/"); plus = new Button("+");
        minus = new Button("-"); multiply = new Button("*");
        decPoint = new Button("."); equal = new Button("=");
    }

    public void launchFrame() {
        f.addWindowListener(this);

        f.add( tf,BorderLayout.NORTH);

        //f.setBackground(Color.blue);

        //p.setBackground(Color.yellow);
        f.add(p,BorderLayout.CENTER);
        p.setLayout (new GridLayout(4,4));
        p.add(b7);  p.add(b8); p.add(b9); p.add(division);
        p.add(b4);  p.add(b5); p.add(b6); p.add(multiply);
        p.add(b1);  p.add(b2); p.add(b3); p.add(minus);
        p.add(b0);  p.add(decPoint ); p.add(equal); p.add(plus);

        b0.addActionListener(this);
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        b5.addActionListener(this);
        b6.addActionListener(this);
        b7.addActionListener(this);
        b8.addActionListener(this);
        b9.addActionListener(this);
        division.addActionListener(this);
        plus.addActionListener(this);
        minus.addActionListener(this);
        multiply.addActionListener(this);
        decPoint .addActionListener(this);
        equal.addActionListener(this);


        f.setSize(300, 300);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        CalcListener calcu = new CalcListener();
        calcu.launchFrame();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==b0)
        {
            s3 = tf.getText();
            s4 = "0";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b1)
        {
            s3 = tf.getText();
            s4 = "1";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b2)
        {
            s3 = tf.getText();
            s4 = "2";
            s5 = s3+s4;
            tf.setText(s5);
        }if(e.getSource()==b3)
        {
            s3 = tf.getText();
            s4 = "3";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b4)
        {
            s3 = tf.getText();
            s4 = "4";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b5)
        {
            s3 = tf.getText();
            s4 = "5";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b6)
        {
            s3 = tf.getText();
            s4 = "6";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b7)
        {
            s3 = tf.getText();
            s4 = "7";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b8)
        {
            s3 = tf.getText();
            s4 = "8";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==b9)
        {
            s3 = tf.getText();
            s4 = "9";
            s5 = s3+s4;
            tf.setText(s5);
        }
        if(e.getSource()==plus)
        {
            s1 = tf.getText();
            tf.setText("");
            c=1;

        }
        if(e.getSource()==minus)
        {
            s1 = tf.getText();
            tf.setText("");
            c=2;

        }
        if(e.getSource()==multiply)
        {
            s1 = tf.getText();
            tf.setText("");
            c=3;

        }
        if(e.getSource()==division)
        {
            s1 = tf.getText();
            tf.setText("");
            c=4;

        }

        if(e.getSource()==equal)
        {
            s2 = tf.getText();
            if(c==1)
            {
                n = Integer.parseInt(s1)+Integer.parseInt(s2);
                tf.setText(String.valueOf(n));
            }
            else
            if(c==2)
            {
                n = Integer.parseInt(s1)-Integer.parseInt(s2);
                tf.setText(String.valueOf(n));
            }
            else
            if(c==3)
            {
                n = Integer.parseInt(s1)*Integer.parseInt(s2);
                tf.setText(String.valueOf(n));
            }
            if(c==4)
            {
                try
                {
                    int p=Integer.parseInt(s2);
                    if(p!=0)
                    {
                                        n = Integer.parseInt(s1)/Integer.parseInt(s2);
                    tf.setText(String.valueOf(n));
                     }
                     else
                        tf.setText("infinite");

                }
                catch(Exception i){}
            }

            if(e.getSource()==decPoint ){
             tf.setText(tf.getText()+decPoint );

            }



            /*
            if(e.getSource()==dot){

             s1 = tf.getText();
             if (s1.indexOf('.')==-1){
                 tf.setText(".");
                 c=5;
             } else{

             }
                tf.setText("");
                c=5;

            }*/
        }

    }




///////////////////////////////////
    @Override
    public void windowOpened(WindowEvent e) {
        // TODO Auto-generated method stub

    }
/////////////////////////////////////
    @Override
    public void windowClosing(WindowEvent e) {
        System.exit(0);
/////////////////////////////////////
    }

    @Override
    public void windowClosed(WindowEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void windowIconified(WindowEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void windowDeiconified(WindowEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void windowActivated(WindowEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void windowDeactivated(WindowEvent e) {
        // TODO Auto-generated method stub

    }

}