/*
 * Copyright 2011 by Graz University of Technology, Austria
 * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint
 * initiative of the Federal Chancellery Austria and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


package at.gv.egiz.bku.local.gui;

import at.gv.egiz.bku.gui.ViewerHelpListener;
import java.awt.Desktop;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.net.URI;
import java.net.URL;
import java.util.Locale;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Open help document in browser, fallback to help viewer (swing dialog) if Java Desktop API not supported.
 * 
 * @author Clemens Orthacker <clemens.orthacker@iaik.tugraz.at>
 */
public class LocalHelpListener extends ViewerHelpListener {

  private final Logger log = LoggerFactory.getLogger(LocalHelpListener.class);
  
  protected Desktop desktop;

  public LocalHelpListener(URL baseURL, Locale locale) {
    super(baseURL, locale);
    if (Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
      desktop = Desktop.getDesktop();
    } else {
      log.warn("Java Desktop API not available on current platform (libgnome installed?), " +
              "falling back to help viewer");
    }
  }

  @Override
  public void mouseClicked(MouseEvent e) {
    if (desktop != null) {
      try {
        desktop.browse(new URI(getHelpURL()));
      } catch (Exception ex) {
        log.error("Failed display help document {}.", getHelpURL(), ex);
        super.mouseClicked(e);
      }
    } else {
      super.mouseClicked(e);
    }
  }

  @Override
  public void keyPressed(KeyEvent e) {
    if (desktop != null) {
      try {
        desktop.browse(new URI(getHelpURL()));
      } catch (Exception ex) {
        log.error("Failed display help document {}.", getHelpURL(), ex);
        super.keyPressed(e);
      }
    } else {
      super.keyPressed(e);
    }
  }
}