/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3) 
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details. 
 */

package org.dive4elements.river.client.server;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.log4j.Logger;

import org.dive4elements.river.client.server.LoggingConfigurator;
import org.dive4elements.river.client.server.features.Features;
import org.dive4elements.river.client.server.features.XMLFileFeatures;

/**
 * ServletContextListenter to initalize the Features globally for
 * all Servlets
 */
public class BaseServletContextListener implements ServletContextListener {

    public static final String LOG4J_PROPERTIES = "FLYS_CLIENT_LOG4J_PROPERIES";

    public static final Logger logger = Logger.getLogger(BaseServletContextListener.class);

    @Override
    public void  contextInitialized(ServletContextEvent sce) {
        ServletContext sc = sce.getServletContext();

        this.initLogging(sc);

        String filename = sc.getInitParameter("features-file");

        logger.debug("Initializing ServletContext");
        try {
            XMLFileFeatures features = new XMLFileFeatures(sc.getRealPath(filename));
            sc.setAttribute(Features.CONTEXT_ATTRIBUTE, features);
        } catch(IOException e) {
            logger.error(e);
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        //DO NOTHING
    }


    private void initLogging(ServletContext sc) {
        String log4jProperties = System.getenv(LOG4J_PROPERTIES);

        if (log4jProperties == null || log4jProperties.length() == 0) {
            String file = sc.getInitParameter("log4j-properties");

            if (file != null && file.length() > 0) {
                log4jProperties = sc.getRealPath(file);
            }
        }
        System.out.println(log4jProperties);

        LoggingConfigurator.init(log4jProperties);
    }
}