package Calculator;

// CalcGUI.java

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class CalcGUI extends JFrame implements ActionListener, KeyListener {
    JPanel contentPane;
    JMenuBar jMenuBar1 = new JMenuBar();
    JMenu menuFile = new JMenu();
    JMenuItem menuQuit = new JMenuItem();
    JTextField solution = new JTextField();

    JButton[] numbers = new JButton[10];
    JButton minus = new JButton();
    JButton multiply = new JButton();
    JButton add = new JButton();
    JButton divide = new JButton();
    JButton equals = new JButton();
    JButton clear = new JButton();

    String temp = "";
    
    public CalcGUI() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    private void jbInit() throws Exception {

        addKeyListener(this);
        contentPane = (JPanel) getContentPane();

        for(int index = 0; index<10; index++) {
            numbers[index] = new JButton(Integer.toString(index));
            contentPane.add(numbers[index]);
            numbers[index].addActionListener(this);
            numbers[index].addKeyListener(this);
        }
        numbers[1].setBounds(new Rectangle(9, 51, 51, 23));
        numbers[2].setBounds(new Rectangle(73, 51, 51, 23));
        numbers[3].setBounds(new Rectangle(137, 51, 51, 23));
        numbers[4].setBounds(new Rectangle(9, 83, 51, 23));
        numbers[5].setBounds(new Rectangle(73, 83, 51, 23));
        numbers[6].setBounds(new Rectangle(137, 83, 51, 23));
        numbers[7].setBounds(new Rectangle(9, 115, 51, 23));
        numbers[8].setBounds(new Rectangle(73, 115, 51, 23));
        numbers[9].setBounds(new Rectangle(137, 115, 51, 23));
        numbers[0].setBounds(new Rectangle(73, 147, 51, 23));

        this.setJMenuBar(jMenuBar1);
        setSize(new Dimension(268, 237));
        setTitle("Calculator");
        contentPane.setLayout(null);
        menuQuit.setText("Quit");
        menuQuit.addActionListener(this);
        menuFile.setText("File");
        solution.setForeground(Color.black);
        solution.setDisabledTextColor(Color.black);
        solution.setBackground(Color.white);
        solution.setEditable(false);
        solution.setBounds(new Rectangle(9, 13, 179, 19));
        minus.setBounds(new Rectangle(200, 83, 51, 23));
        minus.setText("-");
        multiply.setBounds(new Rectangle(200, 115, 51, 23));
        multiply.setText("*");
        add.setBounds(new Rectangle(200, 51, 51, 23));
        add.setText("+");
        add.addActionListener(this);
        divide.setBounds(new Rectangle(200, 147, 51, 23));
        divide.setToolTipText("");
        divide.setText("/");
        equals.setBounds(new Rectangle(200, 11, 51, 23));
        equals.setText("=");
        clear.setBounds(new Rectangle(137, 147, 51, 23));
        clear.setText("C");
        clear.addActionListener(this);
        jMenuBar1.add(menuFile);
        menuFile.add(menuQuit);
        contentPane.add(solution);
        contentPane.add(add);
        contentPane.add(minus);
        contentPane.add(multiply);
        contentPane.add(divide);
        contentPane.add(equals);
        contentPane.add(clear);

    }

    public void actionPerformed(ActionEvent e) {

      Object source = e.getSource();
      if(source==menuQuit) {
        System.exit(0);
      }

      for(int index = 0; index<numbers.length; index++) {
        if(source==numbers[index]) {
          temp = temp + ((JButton)source).getText();
          solution.setText(temp); return;
        }
      }

      if(source==clear) {
        temp = "";
        solution.setText(temp);
      }

    }

    public void keyPressed(KeyEvent e) {

      char c = e.getKeyChar();
      if(c>='0'&&c<='9') {
        temp = temp+c;
        solution.setText(temp);        
      } else if(c=='+') {
// do plus operation...
      }

    }

    public void keyReleased(KeyEvent e) { }
    public void keyTyped(KeyEvent e) { }

}