/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package org.apache.myfaces.tobago.webapp;
  
  import org.apache.myfaces.tobago.portlet.PortletUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.faces.FacesException;
  import javax.faces.context.ExternalContext;
  import javax.faces.context.FacesContext;
  import javax.faces.event.AbortProcessingException;
  import javax.faces.event.ActionEvent;
  import javax.faces.event.ActionListener;
  import javax.portlet.PortletSession;
  import javax.servlet.http.HttpSession;
  import java.io.IOException;
  import java.lang.invoke.MethodHandles;
  
  public class LogoutActionListener implements ActionListener {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    @Override
    public void processAction(final ActionEvent event) throws AbortProcessingException {
      final FacesContext facesContext = FacesContext.getCurrentInstance();
      final ExternalContext externalContext = facesContext.getExternalContext();
      final Object session = externalContext.getSession(false);
      if (session != null) {
        if (session instanceof HttpSession) {
          ((HttpSession) session).invalidate();
        }
        if (PortletUtils.isPortletApiAvailable() && session instanceof PortletSession) {
          ((PortletSession) session).invalidate();
        }
      }
      final String forward = externalContext.getRequestContextPath() + "/";
      try {
        externalContext.redirect(forward);
      } catch (final IOException e) {
        LOG.error("", e);
        // TODO: may do error handling
        throw new FacesException("Can't redirect to '" + forward + "'");
      }
      facesContext.responseComplete();
    }
  
  }