package com.gmail.dpierron.calibre.gui;

import javax.swing.*;
import java.util.Arrays;

/**
 * <b>Bare Bones Browser Launch for Java</b><br>
 * Utility class to open a web page from a Swing application
 * in the user's default browser.<br>
 * Supports: Mac OS X, GNU/Linux, Unix, Windows XP/Vista/7<br>
 * Example Usage:<code><br> &nbsp; &nbsp;
 * String url = "http://www.google.com/";<br> &nbsp; &nbsp;
 * BareBonesBrowserLaunch.openURL(url);<br></code>
 * Latest Version: <a href="http://www.centerkey.com/java/browser/">www.centerkey.com/java/browser</a><br>
 * Author: Dem Pilafian<br>
 * Public Domain Software -- Free to Use as You Like
 *
 * @version 3.0, February 7, 2010
 */
public class BareBonesBrowserLaunch {

  static final String[] browsers =
      {"google-chrome", "firefox", "opera", "konqueror", "epiphany", "seamonkey", "galeon", "kazehakase", "mozilla"};
  static final String errMsg = "Error attempting to launch web browser";

  /**
   * Opens the specified web page in the user's default browser
   *
   * @param url A web address (URL) of a web page (ex: "http://www.google.com/")
   */
  public static void openURL(String url) {
    try {  //attempt to use Desktop library from JDK 1.6+ (even if on 1.5)
      Class<?> d = Class.forName("java.awt.Desktop");
      d.getDeclaredMethod("browse", new Class[]{java.net.URI.class})
          .invoke(d.getDeclaredMethod("getDesktop").invoke(null), new Object[]{java.net.URI.create(url)});
      //above code mimics:
      //   java.awt.Desktop.getDesktop().browse(java.net.URI.create(url));
    } catch (Exception ignore) {  //library not available or failed
      String osName = System.getProperty("os.name");
      try {
        if (osName.startsWith("Mac OS")) {
          Class.forName("com.apple.eio.FileManager").getDeclaredMethod("openURL", new Class[]{String.class})
              .invoke(null, new Object[]{url});
        } else if (osName.startsWith("Windows"))
          Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + url);
        else { //assume Unix or Linux
          boolean found = false;
          for (String browser : browsers)
            if (!found) {
              found = Runtime.getRuntime().exec(new String[]{"which", browser}).waitFor() == 0;
              if (found)
                Runtime.getRuntime().exec(new String[]{browser, url});
            }
          if (!found)
            throw new Exception(Arrays.toString(browsers));
        }
      } catch (Exception e) {
        JOptionPane.showMessageDialog(null, errMsg + "\n" + e.toString());
      }
    }
  }

}
