/*!
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 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 Lesser General Public License for more details.
 *
 * Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
 */

package org.pentaho.platform.web.http.session;

import org.pentaho.platform.api.engine.IPentahoSession;
import org.pentaho.platform.engine.core.audit.AuditHelper;
import org.pentaho.platform.engine.core.audit.MessageTypes;
import org.pentaho.platform.engine.core.system.PentahoSystem;
import org.pentaho.platform.util.logging.Logger;
import org.pentaho.platform.util.messages.LocaleHelper;
import org.pentaho.platform.web.http.messages.Messages;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class PentahoHttpSessionListener implements HttpSessionListener {

  private static final boolean debug = PentahoSystem.debug;

  private static final Map<String, String[]> sessionMap = new ConcurrentHashMap<String, String[]>();

  public void sessionCreated( final HttpSessionEvent event ) {
    // we can't find out what the locale of the request is so we go with the
    // default for now...
    LocaleHelper.setLocale( Locale.getDefault() );
    String sessionId = event.getSession().getId();
    if ( PentahoHttpSessionListener.debug ) {
      Logger.debug( this, Messages.getInstance().getString( "HttpSessionListener.DEBUG_SESSION_CREATED", sessionId ) ); //$NON-NLS-1$
    }

    // AuditHelper.audit( instanceId, String userId, String actionName,
    // String objectType, MessageTypes.PROCESS_ID_SESSION,
    // MessageTypes.SESSION_CREATE, "http session", "", 0, null );

  }

  public void sessionDestroyed( final HttpSessionEvent event ) {
    HttpSession session = event.getSession();
    try {
      if ( session != null ) {
        String sessionId = event.getSession().getId();
        Object obj = session.getAttribute( PentahoSystem.PENTAHO_SESSION_KEY ); //$NON-NLS-1$
        if ( obj != null ) {
          IPentahoSession userSession = (IPentahoSession) obj;
          PentahoSystem.invokeLogoutListeners( userSession );
          userSession.destroy();
        } else {
          String[] info = PentahoHttpSessionListener.getSessionInfo( sessionId );
          if ( info != null ) {
            String instanceId = info[5];
            String userId = info[3];
            String activityId = info[1];
            String objectType = info[2];
            String processId = info[0];
            String messageType = MessageTypes.SESSION_END;
            String message = "http "; //$NON-NLS-1$
            String value = ""; //$NON-NLS-1$
            long startTime = Long.parseLong( info[4] );
            long endTime = new Date().getTime();
            if ( !"anonymousUser".equals( userId ) ) {
              AuditHelper.audit( instanceId, userId, activityId, objectType, processId, messageType, message, value,
                  ( ( endTime - startTime ) / 1000 ), null );
            }
          }
        }
      }
    } catch ( Throwable e ) {
      Logger.error( this, Messages.getInstance().getErrorString(
          "HttpSessionListener.ERROR_0001_ERROR_DESTROYING_SESSION" ), e ); //$NON-NLS-1$
    }

  }

  public static void registerHttpSession( final String sessionId, final String processId, final String activityId,
      final String objectName, final String userName, final String id, final long start ) {
    PentahoHttpSessionListener.sessionMap.put( id, new String[] { processId, activityId, objectName, userName,
      new Long( start ).toString(), sessionId } );
  }

  public static void deregisterHttpSession( final String id ) {
    PentahoHttpSessionListener.sessionMap.remove( id );
  }

  private static String[] getSessionInfo( final String id ) {
    return (String[]) PentahoHttpSessionListener.sessionMap.get( id );
  }

}