/*
 This file is part of the software framework JStatCom, 
 a library for building applications for data based analysis.

 Copyright (C) 2000-2005  Markus Kraetzig

 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 USA
 */

package com.jstatcom.component;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Insets;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.io.File;
import java.io.IOException;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.SwingConstants;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

import org.apache.log4j.Logger;

/**
 * Dialog that shows about info, the license, and the splashscreen image. It
 * uses the properties from the app.properties file.
 * 
 * @author Markus Kraetzig 
 */
public class TopFrameAboutBox extends JDialog {
    private static final Logger log = Logger.getLogger(TopFrameAboutBox.class);

    private final String display;

    private final String version;

    private final String image;

    private final String licenseFile;

    private JLabel label = null;

    private JTabbedPane tabPane = null;

    private MultiLineLabel infoArea = null;

    /**
     * Creates an instance of this dialog that can be used as an about box.
     * 
     * @param owner
     * @param title
     */
    public TopFrameAboutBox(Frame owner, String title, String version,
            String display, String image, String licenseFile) {
        super(owner, title, true);
        this.version = version;
        this.display = display;
        this.image = image;
        this.licenseFile = licenseFile;
        initialize();
    }

    private JLabel getLabel() {
        if (label == null) {
            label = new JLabel("");
            label.setBackground(Color.white);
            label.setHorizontalAlignment(SwingConstants.CENTER);
            label.setVerticalAlignment(SwingConstants.TOP);

            URL url = getClass().getResource(image);
            if (url != null)
                label.setIcon(new ImageIcon(url));
        }
        return label;
    }

    /**
     * Gets the label with author and version info. Can be overriden by
     * subclasses to change formatting.
     * 
     * @return MultiLineLabel with formatted author and version
     *         info
     */
    protected MultiLineLabel getInfoArea() {
        if (infoArea == null) {
            infoArea = new MultiLineLabel();
            infoArea.setText("version: " + version);
            infoArea.setHorizontalAlignment(SwingConstants.CENTER);
            infoArea.setVerticalAlignment(SwingConstants.TOP);
            infoArea.setMinimumSize(new Dimension(45, 30));
            infoArea.setBackground(Color.white);
        }
        return infoArea;
    }

    private void addAuthorInfoArea() {
        // Info area
        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);
        JScrollPane scroller = new JScrollPane(textArea);
        textArea.setMargin(new Insets(5, 5, 5, 5));
        textArea.setText(display);
        scroller.setName("Info");
        tabPane.add(scroller);
    }

    private void addLicenseArea() {
        // Info area
        final JTextPane textPane = new JTextPane();
        textPane.setEditable(false);
        JScrollPane scroller = new JScrollPane(textPane);
        textPane.setMargin(new Insets(5, 5, 5, 5));

        try {
            textPane.setPage(new File(licenseFile).toURI().toURL());
        } catch (IOException e) {
            log.error("Setting license failed", e);
        }
        textPane.addHyperlinkListener(new HyperlinkListener() {
            public void hyperlinkUpdate(HyperlinkEvent e) {
                try {
                    if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
                        textPane.setPage(e.getURL());
                } catch (Throwable ex) {
                    log.error("text pane updated failed", ex);
                }
            }
        });
        scroller.setName("License");
        tabPane.add(scroller);
    }

    private void initialize() {
        setSize(385, 360);
        setLocationRelativeTo(getParent());
        JPanel contentPane = new JPanel(new BorderLayout());
        tabPane = new JTabbedPane();
        JPanel displayPane = new JPanel();

        displayPane.setLayout(new java.awt.GridBagLayout());
        displayPane.setBackground(Color.white);

        java.awt.GridBagConstraints constraintsJLabel1 = new java.awt.GridBagConstraints();
        constraintsJLabel1.gridx = 0;
        constraintsJLabel1.gridy = 0;
        constraintsJLabel1.gridwidth = 1;

        constraintsJLabel1.fill = java.awt.GridBagConstraints.BOTH;
        displayPane.add(getLabel(), constraintsJLabel1);

        java.awt.GridBagConstraints constraintsInfoArea = new java.awt.GridBagConstraints();
        constraintsInfoArea.gridx = 0;
        constraintsInfoArea.gridy = 1;
        constraintsInfoArea.weightx = 1.0;
        constraintsInfoArea.weighty = 1.0;

        constraintsInfoArea.fill = java.awt.GridBagConstraints.BOTH;
        constraintsInfoArea.insets = new java.awt.Insets(10, 20, 5, 5);
        displayPane.add(getInfoArea(), constraintsInfoArea);

        displayPane.setName("Version");
        tabPane.add(displayPane);

        // bring first tab to front
        addComponentListener(new ComponentAdapter() {
            public void componentShown(ComponentEvent e) {
                tabPane.setSelectedIndex(0);
            }
        });

        addAuthorInfoArea();
        addLicenseArea();

        contentPane.add(tabPane, BorderLayout.CENTER);
        contentPane.setBackground(Color.white);
        setContentPane(contentPane);

    }
}