/**
 * Minibrowse is a simple web browser that uses Java's rendering engine.
 *
 * @author Dave Musicant
 * @author Jack Goldfeather
 * @author Amy Csizmar Dalal
 */

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

class Minibrowse implements ActionListener
{
    private JFrame frame;
    private JEditorPane htmlPane;
    private JTextField url;

    public Minibrowse()
    {
        // Set up the main window.
        frame = new JFrame("Minibrowse");
        frame.setLocation(50,50);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create a component that can render HTML. Wrap a scollbar
        // component around it.
        htmlPane = new JEditorPane();
        htmlPane.setContentType("text/html");
        htmlPane.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(htmlPane);
        scrollPane.setPreferredSize(new Dimension(500,500));

        // Create a Home button.
        JButton homeButton = new JButton("Home");
        homeButton.addActionListener(this);

        // Create a blank space where the user will type in the web
        // page to visit.
        url = new JTextField(30);
        url.setActionCommand("url");
        url.addActionListener(this);

        // Create a JPanel to hold the "toolbar" that contains the
        // Home button and the URL field.
        JPanel panel = new JPanel();
        panel.add(homeButton);
        panel.add(url);

        // Add the "toolbar" panel to the top of the window, and the
        // scrollable HTML window to the middle of the window.
        frame.add(panel,BorderLayout.NORTH);
        frame.add(scrollPane,BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent event)
    {
        String actionCommand = event.getActionCommand();

        if (actionCommand.equals("Home"))
            url.setText("http://www.carleton.edu");

        if (actionCommand.equals("Home") || actionCommand.equals("url"))
        {
            try
            {
                htmlPane.setPage(url.getText());
            }
            catch (IOException exc)
            {
                JOptionPane.showMessageDialog(frame,"Bad page","Error.",
                                              JOptionPane.ERROR_MESSAGE);
            };
        }
        else
            throw new UnsupportedOperationException(actionCommand);
    }

    public static void main(String[] args)
    {
        Minibrowse minibrowse = new Minibrowse();
    }
}