/*
 * (C) Copyright 2006-2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * This library 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.
 *
 * Contributors:
 *     anguenot
 *
 * $Id: WebAccessLogActionListener.java 28475 2008-01-04 09:49:02Z sfermigier $
 */

package org.nuxeo.ecm.platform.audit.web.access;

import static org.jboss.seam.ScopeType.CONVERSATION;

import java.security.Principal;

import javax.ejb.Local;
import javax.ejb.Remote;
import javax.ejb.Remove;
import javax.ejb.Stateful;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.annotation.ejb.SerializedConcurrentAccess;
import org.jboss.seam.annotations.Destroy;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Observer;
import org.jboss.seam.annotations.Scope;
import org.nuxeo.ecm.core.api.ClientException;
import org.nuxeo.ecm.core.api.DocumentModel;
import org.nuxeo.ecm.core.api.event.CoreEventConstants;
import org.nuxeo.ecm.core.api.event.DocumentEventCategories;
import org.nuxeo.ecm.core.event.Event;
import org.nuxeo.ecm.core.event.EventService;
import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
import org.nuxeo.ecm.platform.audit.web.access.api.AccessLogObserver;
import org.nuxeo.ecm.platform.audit.web.access.api.WebAccessConstants;
import org.nuxeo.ecm.platform.audit.web.access.api.local.AccessLogObserverLocal;
import org.nuxeo.ecm.platform.audit.web.access.api.remote.AccessLogObserverRemote;
import org.nuxeo.ecm.platform.ui.web.api.NavigationContext;
import org.nuxeo.ecm.webapp.helpers.EventNames;
import org.nuxeo.runtime.api.Framework;

/**
 * Access log action listener.
 *
 * <p>
 * Responsible of logging web access. Attention, this will decrease the
 * performances of the webapp.
 * </p>
 *
 * @author <a href="mailto:ja@nuxeo.com">Julien Anguenot</a>
 *
 */
@Stateful
@Local(AccessLogObserverLocal.class)
@Remote(AccessLogObserverRemote.class)
@Name("webAccessLogObserver")
@Scope(CONVERSATION)
@SerializedConcurrentAccess
public class WebAccessLogActionListener implements AccessLogObserver {

    private static final long serialVersionUID = 1L;

    private static final Log log = LogFactory.getLog(WebAccessLogActionListener.class);

    @In(create = true)
    protected NavigationContext navigationContext;

    @In(create = true)
    protected Principal currentUser;

    @Destroy
    @Remove
    public void destroy() {
        log.debug("Removing SEAM component...");
    }

    @Observer( { EventNames.USER_ALL_DOCUMENT_TYPES_SELECTION_CHANGED })
    public void log() {
        DocumentModel dm = navigationContext.getCurrentDocument();
        DocumentEventContext ctx = new DocumentEventContext(navigationContext.getCurrentDocument().getCoreSession(),
        		currentUser, dm);
        ctx.setCategory(DocumentEventCategories.EVENT_DOCUMENT_CATEGORY);
        try {
			ctx.setProperty(CoreEventConstants.DOC_LIFE_CYCLE, dm.getCurrentLifeCycleState());
	        ctx.setProperty(CoreEventConstants.SESSION_ID, dm.getSessionId());
		} catch (ClientException e1) {
            log.error("Error while getting document's lifecycle or session ID", e1);
		}
        Event event = ctx.newEvent(WebAccessConstants.EVENT_ID);
        EventService evtService = null;

        try {
            evtService = Framework.getService(EventService.class);
        }
        catch (Exception e) {
            log.error("Cannot find EventService", e);
        }

        if (evtService != null) {
            log.info("Sending scheduled event id=" + WebAccessConstants.EVENT_ID + ", category="
                    + DocumentEventCategories.EVENT_DOCUMENT_CATEGORY);
            try {
				evtService.fireEvent(event);
			} catch (ClientException e) {
                log.error("Error while sending event to EventService", e);
			}
        }
    }
}