import calculator.*;
import org.omg.CORBA.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;

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

// This class implements a simple calculator client program.
// It relies on a CORBA server to do the actual calculations
//
// Written by: Stuart Hansen
// Date: February 2, 2009
public class CalculatorClient extends JFrame {

    private Calculator calc;  // the remote calculator

    // The GUI Components
    private JLabel firstLabel, secondLabel, resultLabel;
    private JTextField first, second, result;
    private JButton addButton, subButton, multButton;

    // The constructor sets up the ORB and the GUI
    public CalculatorClient(String [] args)
    {
	setUpORB(args);
        setUpGUI();
    }  

    // This method sets up all the GUI components
    private void setUpGUI ()
    {
        // Get the content pane of the application
        Container c = getContentPane();
        c.setLayout(null);

        // Add the label and textbox for the first number
        firstLabel = new JLabel ("First Number:");
        firstLabel.setBounds(20, 20, 100, 20);
        first = new JTextField("");
        first.setBounds(140, 20, 50, 20);
        c.add (firstLabel);
        c.add (first);

        // Add the label and the textbox for the second number
        secondLabel = new JLabel ("Second Number:");
        secondLabel.setBounds(20, 50, 100, 20);
        second = new JTextField("");
        second.setBounds (140, 50, 50, 20);
        c.add (secondLabel);
        c.add (second);

        // Add the label and the textbox for the result
        resultLabel = new JLabel ("Result");
        resultLabel.setBounds(20, 80, 100, 20);
        result = new JTextField("");
        result.setBounds (140, 80, 50, 20);
        c.add (resultLabel);
        c.add (result);

        // Add the Add button
        addButton = new JButton("Add");
        addButton.setBounds (20, 110, 70, 20);
        addButton.addActionListener(new AddHandler());
        c.add(addButton);

        // Add the Subtract Button
        subButton = new JButton("Sub");
        subButton.setBounds (100, 110, 70, 20);
        subButton.addActionListener(new SubHandler());
        c.add(subButton);

        // Add the Multiply Button
        multButton = new JButton("Mult");
        multButton.setBounds (180, 110, 70, 20);
        multButton.addActionListener(new MultHandler());
        c.add(multButton);

        // Set a couple of properties and open the window
        setTitle("CORBA Calculator");
        setSize (300, 170);          
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    // An inner class to handle clicks on the add button
    private class AddHandler implements ActionListener
    {
        public void actionPerformed (ActionEvent e)
        {
            int firstNum = Integer.parseInt(first.getText());
            int secondNum = Integer.parseInt(second.getText());
            int resultNum = calc.add(firstNum, secondNum);
            result.setText(Integer.toString(resultNum));
	}
    }

    // An inner class to handle clicks on the subtract button
    private class SubHandler implements ActionListener
    {
        public void actionPerformed (ActionEvent e)
        {
            int firstNum = Integer.parseInt(first.getText());
            int secondNum = Integer.parseInt(second.getText());
            int resultNum = calc.sub(firstNum, secondNum);
            result.setText(Integer.toString(resultNum));
	}
    }

    // An inner class to handle clicks on the multiply button
    private class MultHandler implements ActionListener
    {
        public void actionPerformed (ActionEvent e)
        {
            int firstNum = Integer.parseInt(first.getText());
            int secondNum = Integer.parseInt(second.getText());
            int resultNum = calc.mult(firstNum, secondNum);
            result.setText(Integer.toString(resultNum));
	}
    }

    // Set up the data communication with the server
    private void setUpORB(String [] args)
    {
        try {
            // Create and initialize the ORB
            ORB orb = ORB.init(args, null);

            // Get a reference to the name service
            org.omg.CORBA.Object nameServiceObj = 
                orb.resolve_initial_references("NameService");

            // Narrow (cast) the object reference to a name service reference 
            NamingContextExt nameService = 
                NamingContextExtHelper.narrow(nameServiceObj);
 
            // Get a reference to the calculator from the name service
            org.omg.CORBA.Object calcObj = 
                    nameService.resolve_str("CalculatorServer");

            // Narrow (cast) the object reference to a calculator reference
            calc = CalculatorHelper.narrow(calcObj);

        } catch (Exception e) {
            System.out.println("ERROR : " + e) ;
            e.printStackTrace(System.out);
        }
    }
      
    // The main simply makes a new calculator client
    public static void main(String args[]) {
        new CalculatorClient (args);
    }
}