/*
 * File    : Check.java
 * Created : 09-jul-2002 10:06
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details (see the LICENSE file).
 */

package edu.xtec.util;

import java.awt.Dimension;
import java.net.URL;
import javax.swing.JDialog;
import javax.swing.JEditorPane;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

/**
 * This class is useful to display a warning message when a specific
 * requirement is not satisfied. Examples of unsatisfied requirements are the ability to
 * instantiate a specific class, to access to a file or resource, or to have specific
 * permissions. The message can be stored into an HTML resource, and will be
 * displayed in a {@link javax.swing.JEditorPane}. Users will be able to follow the
 * links included in the HTML document.
 * @author Francesc Busquets (fbusquets@xtec.net)
 * @version 1.0
 */
public class Check {
    
    private static final String DLG_KEY="CHECK_DIALOG";
    
    private Check(){
    }
    
    public static void showUrlPane(final Options options, String urlKey){
        final Messages msg=options.getMessages();
        HyperlinkListener hlst=new HyperlinkListener(){
            public void hyperlinkUpdate(HyperlinkEvent e){
                if(e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
                    final URL sUrl=e.getURL();
                    SwingUtilities.invokeLater(new Runnable(){
                        public void run(){
                            try{
                                if(options.getApplet()!=null)
                                    options.getApplet().getAppletContext().showDocument(sUrl);
                                else
                                    BrowserLauncher.openURL(sUrl.toExternalForm());
                            } catch(Exception ex){
                                msg.showErrorWarning((JDialog)options.get(DLG_KEY), "URL_LAUNCH_ERROR", ex);
                            }
                        }
                    });
                }
            }
        };
        
        JScrollPane scroll=null;
        try{
            URL url=ResourceManager.getResource(msg.get(urlKey));
            JEditorPane ep=new JEditorPane(url);
            ep.setEditable(false);
            ep.addHyperlinkListener(hlst);
            scroll=new JScrollPane(ep);
            scroll.setPreferredSize(new Dimension(500, 400));
            
        } catch(Exception ex){
            msg.showErrorWarning(options.getMainComponent(), "URL_ERROR", ex);
            return;
        }
        
        JOptionPane pane=new JOptionPane(new Object[]{scroll}, JOptionPane.WARNING_MESSAGE);
        JDialog dialog = pane.createDialog(options.getMainComponent(), msg.get(Messages.WARNING));
        options.put(DLG_KEY, dialog);
        dialog.setVisible(true);
        options.remove(DLG_KEY);
    }
    
    public static boolean checkSignature(Options options, boolean showWarning){
        boolean result=false;
        try{
            System.getProperty("java.class.path");
            result=true;
        } catch (SecurityException ex){
            if(showWarning)
                showUrlPane(options, "CHECK_SIGNATURE_URL");
        }
        return result;
    }    
}