/*
    *  Copyright (C) 2003-2005 SINTEF
    *  Author:  Fredrik Vraalsen (fredrik dot vraalsen at sintef dot no)
    *  Webpage: http://coras.sourceforge.net/
    *
    *  This program 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 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
   *  Lesser General Public License for more details.
   *
   *  You should have received a copy of the GNU Lesser General Public
   *  License along with this program; if not, write to the Free
   *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   *  02111-1307 USA
   */
  package coras.client.ui;
  
  import java.awt.BorderLayout;
  import java.awt.Cursor;
  import java.awt.event.ComponentAdapter;
  import java.awt.event.ComponentEvent;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.Map;
  
  import javax.swing.JButton;
  import javax.swing.JPanel;
  import javax.swing.JToolBar;
  
  import org.jdesktop.jdic.browser.WebBrowser;
  import org.jdesktop.jdic.browser.WebBrowserEvent;
  import org.jdesktop.jdic.browser.WebBrowserListener;
  
  import coras.client.SwingWorker;
  
  import javax.swing.ImageIcon;
  import javax.swing.JTextField;
  /***
   * @author fvr
   *
   * TODO To change the template for this generated type comment go to
   * Window - Preferences - Java - Code Style - Code Templates
   */
  public class HtmlPanel extends JPanel {
  
  	private JPanel browserPanel = null;
  	private WebBrowser webBrowser = null;
  	private JToolBar navigationPanel = null;
  	private JButton homeButton = null;
  	private JButton backButton = null;
  	private JButton forwardButton = null;
  	private Map idMap = null;
  	private String homeId;
  	private boolean initialised = false;
  	private String firstUrl;
  	private JTextField statusField = null;
  	
  	/***
  	 * This is the default constructor
  	 */
  	public HtmlPanel(Map idMap, String homeId) {
  		super();
  		initialize();
  		this.idMap = idMap;
  		this.homeId = homeId;
  		addComponentListener(new ComponentAdapter() {
  			public void componentShown(ComponentEvent e) {
  				lazyInit();
  			}
  		});
  		showHelpID(homeId);
  	}
  	
  	public void lazyInit() {
  		if (initialised) {
  			return;
  		}
  		initialised = true;
  		new SwingWorker() {
  			public Object construct() {
  				setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
  				browserPanel.add(getWebBrowser(), BorderLayout.CENTER);
  				showPage(firstUrl);
  				setCursor(Cursor.getDefaultCursor());
  				return null;
  			}
  		}.start();
  	}
  	
  	public void showHelpID(String id) {
  		Object url = idMap != null ? idMap.get(id) : null;
  		if (url instanceof String) {
  			showPage((String) url);
  		}
 	}
 	
 	public void showPage(String relativeUrl) {
 		if (!initialised) {
 			firstUrl = relativeUrl;
 			return;
 		}
 		ClassLoader cl = getClass().getClassLoader();
 		URL url = cl.getResource(relativeUrl);
 		if (url == null) {
 			try {
 				url= new URL("http://coras.sourceforge.net/help/" + relativeUrl);
 			} catch (MalformedURLException e) {
 				// TODO Auto-generated catch block
 				e.printStackTrace();
 			}
 		}
 //		System.out.println("help url: " + url);
 		getWebBrowser().setURL(url);
 		updateButtons();
 	}
 
 	private void updateButtons() {
 		getBackButton().setEnabled(getWebBrowser().isBackEnabled());
 		getForwardButton().setEnabled(getWebBrowser().isForwardEnabled());
 	}
 	
 	/***
 	 * This method initializes this
 	 * 
 	 * @return void
 	 */
 	private  void initialize() {
 		this.setLayout(new BorderLayout());
 		this.add(getNavigationPanel(), java.awt.BorderLayout.NORTH);
 		this.add(getBrowserPanel(), java.awt.BorderLayout.CENTER);
 		this.add(getStatusField(), java.awt.BorderLayout.SOUTH);
 	}
 	/***
 	 * This method initializes webBrowser	
 	 * 	
 	 * @return org.jdesktop.jdic.browser.WebBrowser	
 	 */    
 	private JPanel getBrowserPanel() {
 		if (browserPanel == null) {
 			browserPanel = new JPanel(new BorderLayout());
 		}
 		return browserPanel;
 	}
 	/***
 	 * This method initializes webBrowser	
 	 * 	
 	 * @return org.jdesktop.jdic.browser.WebBrowser	
 	 */    
 	private WebBrowser getWebBrowser() {
 		if (webBrowser == null) {
 			webBrowser = new WebBrowser();
 			webBrowser.addWebBrowserListener(new WebBrowserListener() {
 				public void downloadStarted(WebBrowserEvent e) {
 				}
 				public void downloadCompleted(WebBrowserEvent e) {
 					updateButtons();
 				}
 				public void downloadProgress(WebBrowserEvent e) {
 				}
 				public void downloadError(WebBrowserEvent e) {
 				}
 				public void documentCompleted(WebBrowserEvent e) {
 				}
 				public void titleChange(WebBrowserEvent e) {
 				}
 				public void statusTextChange(WebBrowserEvent e) {
 					getStatusField().setText(e.getData());
 				}
 			});
 		}
 		return webBrowser;
 	}
 	/***
 	 * This method initializes jPanel	
 	 * 	
 	 * @return javax.swing.JPanel	
 	 */    
 	private JToolBar getNavigationPanel() {
 		if (navigationPanel == null) {
 			navigationPanel = new JToolBar();
 			navigationPanel.add(getHomeButton(), null);
 			navigationPanel.add(getBackButton(), null);
 			navigationPanel.add(getForwardButton(), null);
 			navigationPanel.setFloatable(false);
 		}
 		return navigationPanel;
 	}
 	/***
 	 * This method initializes jButton	
 	 * 	
 	 * @return javax.swing.JButton	
 	 */    
 	private JButton getHomeButton() {
 		if (homeButton == null) {
 			homeButton = new JButton();
 			homeButton.setText("Home");
 			homeButton.setIcon(new ImageIcon(getClass().getResource("/images/icons/home.gif")));
 			homeButton.addActionListener(new java.awt.event.ActionListener() { 
 				public void actionPerformed(java.awt.event.ActionEvent e) {    
 					showHelpID(homeId);
 				}
 			});
 		}
 		return homeButton;
 	}
 	/***
 	 * This method initializes jButton	
 	 * 	
 	 * @return javax.swing.JButton	
 	 */    
 	private JButton getBackButton() {
 		if (backButton == null) {
 			backButton = new JButton();
 			backButton.setText("Back");
 			backButton.setEnabled(false);
 			backButton.setIcon(new ImageIcon(getClass().getResource("/images/icons/back.gif")));
 			backButton.addActionListener(new java.awt.event.ActionListener() { 
 				public void actionPerformed(java.awt.event.ActionEvent e) {    
 					getWebBrowser().back();
 				}
 			});
 		}
 		return backButton;
 	}
 	/***
 	 * This method initializes jButton1	
 	 * 	
 	 * @return javax.swing.JButton	
 	 */    
 	private JButton getForwardButton() {
 		if (forwardButton == null) {
 			forwardButton = new JButton();
 			forwardButton.setText("Forward");
 			forwardButton.setEnabled(false);
 			forwardButton.setIcon(new ImageIcon(getClass().getResource("/images/icons/forward.gif")));
 			forwardButton.addActionListener(new java.awt.event.ActionListener() { 
 				public void actionPerformed(java.awt.event.ActionEvent e) {    
 					getWebBrowser().forward();
 				}
 			});
 		}
 		return forwardButton;
 	}
 
 	/***
 	 * This method initializes statusField	
 	 * 	
 	 * @return javax.swing.JTextField	
 	 */
 	private JTextField getStatusField() {
 		if (statusField == null) {
 			statusField = new JTextField();
 			statusField.setEditable(false);
 		}
 		return statusField;
 	}
     }