import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.EmptyBorder;

public class CalculatorFrame extends JFrame implements ActionListener{

    private JPanel contentPane;
    private JMenu jMenuFile, jMenuHelp;
    private JPanel jMaster, jplBackSpace, jplControl;
    private JLabel jLabelOuput;
    private JButton JbnButtons[];
    private JRadioButton JrnButtons[];
    private boolean firstInput = true;
    private String numStr1 = "0";
    private String numStr2 = "0";
    Font f12 = new Font("Times New Roman", 0, 12);
    Font f121 = new Font("Times New Roman", 1, 12);
    private String op;





    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    CalculatorFrame frame = new CalculatorFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public CalculatorFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        // MEnu File
        jMenuFile = new JMenu("File");

        // MEnu Help
        jMenuHelp = new JMenu("Help");

        // Menu Bar
        JMenuBar mb = new JMenuBar();
        mb.add(jMenuFile);
        mb.add(jMenuHelp);
        setJMenuBar(mb);

        // frame componant
        jMaster = new JPanel();
        jLabelOuput = new JLabel("0");

        // add our componante to frame
        getContentPane().add(jLabelOuput, BorderLayout.NORTH);

        JbnButtons = new JButton[25];
        JrnButtons = new JRadioButton[4];
        ButtonGroup bg=new ButtonGroup();

        JrnButtons[0] = new JRadioButton("Base 2");
        JrnButtons[1] = new JRadioButton("Base 8");
        JrnButtons[2] = new JRadioButton("Base 10");
        JrnButtons[3] = new JRadioButton("Base 16");
        bg.add(JrnButtons[0]);
        bg.add(JrnButtons[1]);
        bg.add(JrnButtons[2]);
        bg.add(JrnButtons[3]);
        for(int i = 0; i<= 9; i++) {
            JbnButtons[i] = new JButton(String.valueOf(i));
        }


     // Create operator Jbuttons
            JbnButtons[10] = new JButton("+/-");
            JbnButtons[11] = new JButton(".");
            JbnButtons[12] = new JButton("=");
            JbnButtons[13] = new JButton("/");
            JbnButtons[14] = new JButton("*");
            JbnButtons[15] = new JButton("-");
            JbnButtons[16] = new JButton("+");
            JbnButtons[17] = new JButton("sqrt");
            JbnButtons[18] = new JButton("1/x");
            JbnButtons[19] = new JButton("%");
            jplBackSpace = new JPanel();
            jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));
            JbnButtons[20] = new JButton("Backspace");
            jplBackSpace.add(JbnButtons[20]);
            jplControl = new JPanel();
            jplControl.setLayout(new GridLayout(1, 2, 2, 2));
            JbnButtons[21] = new JButton(" CE ");
            JbnButtons[22] = new JButton("C");

            	JbnButtons[23] = new JButton("A");
            	JbnButtons[24] = new JButton("B");

            jplControl.add(JbnButtons[21]);
            jplControl.add(JbnButtons[22]);
            //      Setting all Numbered JButton's to Blue. The rest to Red
            for (int i = 0; i < JbnButtons.length; i++) {
                JbnButtons[i].setFont(f12);
                if (i < 10)
                    JbnButtons[i].setForeground(Color.blue);
                else
                    JbnButtons[i].setForeground(Color.red);
            }

        JPanel jPLButtons = new JPanel();
        jPLButtons.setLayout(new GridLayout(4, 5));

        // add button to the jPLButtons
        for(int i = 7; i<=9; i++) {
            jPLButtons.add(JbnButtons[i]);
        }


     // add button / and sqrt
            jPLButtons.add(JbnButtons[13]);
            jPLButtons.add(JbnButtons[17]);
            // Second row
            for (int i = 4; i <= 6; i++) {
                jPLButtons.add(JbnButtons[i]);
            }
            // add button * and x^2
            jPLButtons.add(JbnButtons[14]);
            jPLButtons.add(JbnButtons[18]);
            // Third row
            for (int i = 1; i <= 3; i++) {
                jPLButtons.add(JbnButtons[i]);
            }
            //adds button - and %
            jPLButtons.add(JbnButtons[15]);
            jPLButtons.add(JbnButtons[19]);
            //Fourth Row
            // add 0, +/-, ., +, and =
            jPLButtons.add(JbnButtons[0]);
            jPLButtons.add(JbnButtons[10]);
            jPLButtons.add(JbnButtons[11]);
            jPLButtons.add(JbnButtons[16]);
            jPLButtons.add(JbnButtons[12]);

            JPanel jRDButton = new JPanel();
            jRDButton.setLayout(new GridLayout(1, 4));

            jRDButton.add(JrnButtons[0]);
            jRDButton.add(JrnButtons[1]);
            jRDButton.add(JrnButtons[2]);
            jRDButton.add(JrnButtons[3]);

            JPanel jHexButton = new JPanel();
            jHexButton.setLayout(new GridLayout(1, 6 , 2 , 2));

            jHexButton.add(JbnButtons[23]);
            jHexButton.add(JbnButtons[24]);

        // JPANEL MASET
        jMaster.setLayout(new BorderLayout());
        jMaster.add(jPLButtons, BorderLayout.SOUTH);
        jMaster.add(jRDButton, BorderLayout.NORTH);
        jMaster.add(jplBackSpace, BorderLayout.WEST);
        jMaster.add(jplControl, BorderLayout.EAST);
        jMaster.add(jHexButton);



        // add component to frame
        getContentPane().add(jMaster, BorderLayout.SOUTH);
        requestFocus();

        //add listener to button
        for(int i = 0; i< JbnButtons.length; i++) {
            JbnButtons[i].addActionListener(this);
        }
        for(int i = 0; i< JrnButtons.length; i++) {
            JrnButtons[i].addActionListener(this);
        }
        JrnButtons[2].setSelected(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        String resultStr="0";
        String str = String.valueOf(e.getActionCommand());

        System.out.println(str);
        switch(str)
        {
        case "0": case "1": case "2":
        case "3": case "4": case "5":
        case "6": case "7": case "8":
        case "9": if(firstInput)
                  {
                     numStr1 = numStr1 + str;
                     jLabelOuput.setText(numStr1);
                  }
                  else
                  {
                      numStr2 = numStr2 + str;
                      jLabelOuput.setText(numStr2);
                  }
                  break;
        case "+":
        case "-":
        case "*":
        case "%":
        case "/": op = str;
                  firstInput = false;
                  break;
        case "=":
                if (numStr1 != null && numStr2 != null && op != null) {
                  resultStr = String.valueOf(evaluate());
                  jLabelOuput.setText(resultStr);
                  numStr1 = resultStr;
                  numStr2 = "";
                  firstInput = true;
                }
                else {
                 resultStr = numStr1;
                }
                break;
        case "C": jLabelOuput.setText("");
                  numStr1 = "0";
                  numStr2 = "0";
                  firstInput = true;
                  break;
        case "1/x":
                  op = str;
                  numStr2 = "0";
                  firstInput = true;
                  break;
        case "+/-":
                  numStr1=String.valueOf(-Double.parseDouble(numStr1));
                  jLabelOuput.setText(numStr1);
                  firstInput = true;
                  break;
        case "sqrt":
                  numStr1=String.valueOf(Math.sqrt(Double.parseDouble(numStr1)));
                  jLabelOuput.setText(numStr1);
                  firstInput = true;
                  break;
        case ".":
                  numStr1=numStr1.concat(".");
                  jLabelOuput.setText(numStr1);
                  break;
            }
    }

    private double evaluate() {
        double resultat=0;
        double x = Double.parseDouble(numStr1);
        double y = Double.parseDouble(numStr2);

        switch(op)
        {
        case "+":   resultat = x + y; break;
        case "-":   resultat = x - y; break;
        case "*":   resultat = x * y; break;
        case "/":   resultat = x / y; break;
        case "%":   resultat = x % y; break;
        case "1/x": resultat = 1 / x; break;
        }

        return resultat;
    }
}