/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * 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.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */

package org.greenstone.gatherer;

import java.applet.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.*;
import javax.swing.JApplet;

import java.io.*;
import javax.swing.*;
import org.greenstone.gatherer.util.Utility;


public class GathererApplet extends JApplet implements ActionListener
{
    private Gatherer gatherer = null;


    protected String fullLibraryURL(String address) 
    {
	String full_address = "";

        // make sure the URL has protocol, host, and file
        if (address.startsWith("http:")) {
            // the address has all the necessary components
	    full_address = address;
        } 
	else if (address.startsWith("/")) {
            // there is not protocol and host
            URL document = getDocumentBase();
	    int port_no = document.getPort();

            String port = (port_no>0) ? ":" + port_no : "";
            full_address = "http://" + document.getHost() + port  + address;
	}

	return full_address;
    }


    /* This is the entry point for the GLI applet */
    public void init()
    {
	// Check if the user has agreed to the requested security settings
	try {
	    // Work-around to reduce number of 
	    // 'Could not lock user prefs' error messages.
	    // Thanks to Walter Schatz from the java forums.
	    System.setProperty("java.util.prefs.syncInterval","2000000");
	}
	catch (Exception exception) {
	    getContentPane().add(new JLabel("Greenstone Librarian Interface Applet deactivated", JLabel.CENTER));
	    return;
	}

	// Ensure platform specific LAF
	try {
	    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
	}
	catch (Exception exception) {
	    exception.printStackTrace();
	}

	// Ensure the GLI user directory exists
        File gli_user_directory = Utility.setGLIUserFolder(getParameter("windowsHome"));
	if (!gli_user_directory.exists() && !gli_user_directory.mkdirs()) {
	    System.err.println("Error: Unable to make directory: " + gli_user_directory.toString());
	}

	// Set some global variables so we know how we're running
	Gatherer.isApplet = true;
	Gatherer.isGsdlRemote = true;
	String library_cgi = fullLibraryURL(getParameter("gwcgi"));
	Gatherer.cgiBase = library_cgi.substring(0, library_cgi.lastIndexOf('/') + 1);

        // String debug_param = getParameter("debug");
        // if ((debug_param != null) && (debug_param.matches("true"))) {
        //     go.debug = true;
        // }

	String[] args = { "-gsdl", gli_user_directory.toString(),
			  "-library_url", library_cgi,
	                };

	// Create an instance of the Gatherer class, which will parse the args and prepare the rest of the GLI
	gatherer = new Gatherer(args);

	// Create a button for the user to press to open the GLI GUI
	JButton launch_GLI_button = new JButton("Launch Greenstone Librarian Interface ...");
	launch_GLI_button.addActionListener(this);
	getContentPane().add(launch_GLI_button);
    }



    public void start() 
    {
	System.err.println("Start called");
    }



    public void stop()
    {
	System.err.println("Stop called");

    }

    public void destroy()
    {
	System.err.println("Destroy called");
	gatherer.exit();
	System.err.println("Done gatherer exit.");
    }


    public void actionPerformed(ActionEvent e)
    {
	gatherer.openGUI();

	// If there was an open collection last session, reopen it
	if (Gatherer.open_collection_file_path != null) {
	    Gatherer.c_man.loadCollection(Gatherer.open_collection_file_path);
	}
    }
}