/*
 * $Id$
 * 
 * This file is part of the Cloud Services Integration Platform (CSIP),
 * 2010-2013, Olaf David and others, Colorado State University.
 *
 * CSIP 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, version 2.1.
 *
 * CSIP 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 OMS.  If not, see <http://www.gnu.org/licenses/lgpl.txt>.
 */
package csip;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Logger;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import org.apache.commons.io.IOUtils;
import org.codehaus.jettison.json.JSONException;

/**
 * Context Registration.
 *
 * @author Olaf David
 */
@WebListener
public class ServletContextHooks implements ServletContextListener {

    static Logger l = Logger.getLogger(ServletContextHooks.class.getName());


    /**
     * Apply an initial config if present.
     *
     * @param ctx
     */
    private void applyConfig(ServletContext ctx, String file) {
        InputStream is = ctx.getResourceAsStream(file);
        if (is != null) {
            try {
                l.info("Applied bundled context config '" + file + "'");
                ControlService.updateConfig(IOUtils.toString(is));
            } catch (IOException | JSONException ex) {
                ex.printStackTrace(System.err);
            }
        }
    }


    @Override
    public void contextInitialized(ServletContextEvent e) {
        Config.startup(e.getServletContext());
        applyConfig(e.getServletContext(), "/WEB-INF/csip-defaults.json");
        applyConfig(e.getServletContext(), "/META-INF/csip-conf.json");

        String s = e.getServletContext().getRealPath("/WEB-INF");
        if (s != null) {
            File file = new File(s).getParentFile();
            if (file != null && file.exists()) {
                File c = new File(file.getParentFile(), file.getName() + ".json");
                if (c.exists()) {
                    try {
                        FileInputStream is = new FileInputStream(c);
                        ControlService.updateConfig(IOUtils.toString(is));
                        l.info("Applied config  '" + c + "'");
                    } catch (FileNotFoundException ex) {
                        // ignore
                    } catch (JSONException | IOException ex) {
                        ex.printStackTrace(System.err);
                    }
                }
            }
        }
        l.info("CSIP Context Created: " + e.getServletContext().getContextPath());
    }


    @Override
    public void contextDestroyed(ServletContextEvent e) {
        Config.shutdown(e.getServletContext());
        l.info("CSIP Context Destroyed: " + e.getServletContext().getContextPath());
    }
}