import objectdraw.*;

import java.awt.*;
import java.awt.event.*;

import java.io.*;

import java.net.*;

import javax.swing.*;

// A class that allows one to fetch an HTML file from the web and
// view its contents
//@width 800
//@height 600
public class Moozilla extends Controller implements ActionListener,
ItemListener {
  // Width of area for URL entry
  private static final int URLFIELDWIDTH = 45;

  // Dimensions for HTML display area
  private static final int HTMLWIDTH = 60;
  private static final int HTMLHEIGHT = 24;

  // Dimensions for links display area
  private static final int LINKSWIDTH = 60;
  private static final int LINKSHEIGHT = 10;

  // Large font for GUI controls
  private Font bigFont = new Font("Times", Font.PLAIN, 16);

  // Area in which HTML is displayed
  private JTextArea htmlText;

  // The "load" button
  private JButton doit;

  // Url controls
  private JTextField urlName;
  private JComboBox favorites;

  // Set up all GUI controls and their listeners
  public void begin() {
    resize(800,600);
    Container panel = getContentPane();
    panel.setLayout(new FlowLayout());

    // Create a "bookmarks" menu
    panel.add(new JLabel("Favorites:"));
    favorites = new JComboBox();
    favorites.setFont(bigFont);
    favorites.addItem("http://www.yahoo.com/index.html");
    favorites.addItem("http://www.nytimes.com/index.html");
    favorites.addItem("http://www.cs.williams.edu/index.html");
    favorites.addItem("http://www.cs.williams.edu/~cs134/index.html");

    favorites.addItemListener(this);
    panel.add(favorites);

    // Create a text area into which a URL may be entered
    urlName = new JTextField("Enter URL", URLFIELDWIDTH);
    urlName.setFont(bigFont);
    panel.add(urlName);

    // Create the button used to start fetching a web page
    doit = new JButton("Fetch HTML");
    doit.setFont(bigFont);
    doit.addActionListener(this);
    panel.add(doit);

    // Create the text areas in which HTML and links will be displayed.
    htmlText = new JTextArea(HTMLHEIGHT, HTMLWIDTH);
    htmlText.setFont(bigFont);
    panel.add(new JScrollPane(htmlText), BorderLayout.CENTER);

    panel.validate();
  }

  // If item is selected from "favorites" menu, enter it as current URL
  public void itemStateChanged(ItemEvent e) {
    urlName.setText(favorites.getSelectedItem().toString());
  }

  // Fetch the given file from server.
  private String getWebPage(String server, String file) {
    String response = "";

    try {
      // open the socket to the server
      Socket tcpSocket = new Socket(server, 80);

      // construct the streams
      BufferedReader input =
        new BufferedReader(new InputStreamReader(tcpSocket.getInputStream()));

      PrintWriter output =
        new PrintWriter(new OutputStreamWriter(tcpSocket.getOutputStream()), true);

      // send the GET request
      output.println("GET " + file);

      // read input until the end of stream
      String line = input.readLine();
      while (line != null) {
        response = response + line + "\n";
        line = input.readLine();
      }

      tcpSocket.close();

    } catch (Exception ex) {
      JOptionPane.showMessageDialog(this, ex);
    }

    return response;
  }

  // When the "Fetch" button is pressed, 
  // try to get the HTML, display and search it.
  public void actionPerformed(ActionEvent e) {
    String urlString = urlName.getText();

    try {
      // break url into host and path
      URL url = new URL(urlString);
      String fullpage = getWebPage(url.getHost(), url.getPath());
      htmlText.setText(fullpage);
    } catch (MalformedURLException ex) {
      JOptionPane.showMessageDialog(this, e);
    }
  }
}