/*

 * Title: japlot.jaxodraw
 * Description: Graphical user interface for drawing Feynman diagrams
 * @author Daniele Binosi 
 * @author Lukas Theussl  

 Copyright (C) 2003-2006,  Daniele Binosi and Lukas Theussl

 See the file LICENSE in the source distribution home directory
 for a full copy of the GPL (GNU General Public License).

    This file is part of japlot.jaxodraw.

    japlot.jaxodraw 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.

    japlot.jaxodraw 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.

    You should have received a copy of the GNU 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 japlot.jaxodraw;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import java.io.IOException;

import java.net.URL;

 
import java.util.ResourceBundle;

import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.KeyStroke;
import javax.swing.WindowConstants;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkEvent.EventType;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLFrameHyperlinkEvent;

import jhplot.utils.AboutDialog;
import jhplot.utils.HelpDialog;


//import java.awt.*;

/** The help menu items. */
public class JaxoHelpMenu extends JMenu implements ActionListener {
    /**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private JaxoMainPanel thePanel;
    private ResourceBundle language =
        ResourceBundle.getBundle(JaxoPrefs.getPref(JaxoPrefs.PREF_LANGUAGE));
    private JMenuItem aboutMI, usrGuideMI, aboutJaPlotMI;
    private JFrame frame;

    /** Creates the help menu from the specified JaxoMainPanel.
     * @param mainPanel The specified JaxoMainPanel.
     */
    public JaxoHelpMenu(JaxoMainPanel mainPanel) {
        super(ResourceBundle.getBundle(JaxoPrefs.getPref(
                    JaxoPrefs.PREF_LANGUAGE)).getString("Help"));
        this.thePanel = mainPanel;

        aboutMI = new JMenuItem(language.getString("About"));
        this.add(aboutMI);
        aboutMI.addActionListener(this);
        aboutMI.setAccelerator(KeyStroke.getKeyStroke('?'));
        aboutMI.setActionCommand("About");


        usrGuideMI = new JMenuItem(language.getString("User_guide"));
        this.add(usrGuideMI);
        usrGuideMI.addActionListener(this);
        usrGuideMI.setAccelerator(KeyStroke.getKeyStroke('G'));
        usrGuideMI.setActionCommand("User_guide");

        aboutJaPlotMI= new JMenuItem("About japlot");
        this.add(aboutJaPlotMI);
        aboutJaPlotMI.addActionListener(this);
      //  usrGuideMI.setAccelerator(KeyStroke.getKeyStroke('P'));
        aboutJaPlotMI.setActionCommand("About japlot");
        
    }

    /** Executes the corresponding action when an item
     * from the help menu is chosen.
     * @param evt The action event to be processed.
     */
    public final void actionPerformed(ActionEvent evt) {
        AbstractButton source = (AbstractButton) evt.getSource();

        if (source.getActionCommand().equals("About")) {
            new AboutDialog(thePanel);
        }if (source.getActionCommand().equals("About japlot")) {
                about();   
        } else if (source.getActionCommand().equals("User_guide")) {
            thePanel.helpEvent();
        }
    }

    /** Pops a small dialog with some information about the current
     * version of japlot.jaxodraw.
     */
    public final void about() {

         String s0= "japlot package. (C) S.Chekanov. Includes the JaxoDraw package \n";  
         String s1= "for drawing  Feynman diagrams";
         String s2=  "(by D.Binosi and L.Theuss)";
         JOptionPane.showMessageDialog(thePanel, s0+s1+s2);
         
        
    }




    /** Sets the text for the entries in the help menu in different languages.
     * @param languageString A string specifying the language to be set.
     */
    public final void setLanguage(String languageString) {
        language = ResourceBundle.getBundle(languageString);

        super.setText(language.getString("Help"));

        aboutMI.setText(language.getString("About"));
        usrGuideMI.setText(language.getString("User_guide"));
    }

    private void displayHTML(String page, boolean listen) {
        URL url = JaxoHelpMenu.class.getClassLoader().getResource(page);
        String newurl = url.toString();

        JEditorPane editorPane = new JEditorPane();
        editorPane.setEditable(false);
        if (listen) {
            editorPane.addHyperlinkListener(new Hyperlisten());
        }

        try {
            editorPane.setPage(newurl);
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null,
                language.getString("Cannot_not_open:") + newurl + "!");

            if (JaxoPrefs.verbose()) {
                System.err.println(e);
            }
        }

        JScrollPane scroller = new JScrollPane(editorPane);
        scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scroller.setPreferredSize(new Dimension(250, 145));
        scroller.setMinimumSize(new Dimension(10, 10));

        JButton closeButton = new JButton(language.getString("Close"));
        closeButton.setBorder(BorderFactory.createRaisedBevelBorder());

        //closeButton.setToolTipText();
        closeButton.addMouseListener(new MouseAdapter() {
                public final void mouseClicked(MouseEvent evt) {
                    frame.dispose();
                }
            });

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(closeButton, BorderLayout.CENTER);

        frame = new JFrame();
        frame.getContentPane().add(scroller, BorderLayout.CENTER);
        frame.getContentPane().add(buttonPanel, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        frame.setSize(1000, 800);
        frame.setTitle(JaxoDraw.VERSION + " - "
            + language.getString("User_guide"));
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    static class Hyperlisten implements HyperlinkListener {
        public final void hyperlinkUpdate(HyperlinkEvent e) {
            if (e.getEventType() == EventType.ACTIVATED) {
                JEditorPane pane = (JEditorPane) e.getSource();

                if (e instanceof HTMLFrameHyperlinkEvent) {
                    HTMLFrameHyperlinkEvent evt = (HTMLFrameHyperlinkEvent) e;
                    HTMLDocument doc = (HTMLDocument) pane.getDocument();
                    doc.processHTMLFrameHyperlinkEvent(evt);
                } else {
                    try {
                        pane.setPage(e.getURL());
                    } catch (Throwable t) {
                        t.printStackTrace();
                    }
                }
            }
        }
    }
}