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/*
 * Ruby for pentaho kettle
 * Copyright (C) 2017 Twineworks GmbH
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.twineworks.kettle.ruby.step;

import java.util.Arrays;

/**
 * Bare Bones Browser Launch for Java

 * Utility class to open a web page from a Swing application in the user's default browser.

 * Supports: Mac OS X, GNU/Linux, Unix, Windows XP/Vista/7

 * Example Usage:
    
 * String url = "http://www.google.com/";
    
 * BareBonesBrowserLaunch.openURL(url);
 Latest Version: www.centerkey.com/java/browser

 * Author: Dem Pilafian

 * Public Domain Software -- Free to Use as You Like
 *
 * @version 3.1, June 6, 2010
 */
public class BareBonesBrowserLaunch {

  static final String[] browsers = {"google-chrome", "firefox", "opera",
    "epiphany", "konqueror", "conkeror", "midori", "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+
      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 mimicks:  java.awt.Desktop.getDesktop().browse()
    } 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
          String browser = null;
          for (String b : browsers)
            if (browser == null && Runtime.getRuntime().exec(new String[]
              {"which", b}).getInputStream().read() != -1)
              Runtime.getRuntime().exec(new String[]{browser = b, url});
          if (browser == null)
            throw new Exception(Arrays.toString(browsers));
        }
      } catch (Exception e) {
        // silently fail
      }
    }
  }

}