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/**
 * Copyright (C) 2019 Bonitasoft S.A.
 * Bonitasoft, 32 rue Gustave Eiffel - 38000 Grenoble
 * This library 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 of the License.
 * 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.
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301, USA.
 **/
package org.bonitasoft.engine.synchro;

import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;

import org.bonitasoft.engine.command.RuntimeCommand;
import org.bonitasoft.engine.command.SCommandExecutionException;
import org.bonitasoft.engine.events.EventService;
import org.bonitasoft.engine.events.model.SEvent;
import org.bonitasoft.engine.events.model.SHandler;
import org.bonitasoft.engine.service.ServiceAccessor;

/**
 * @author Guillaume Rosinosky 
 */
public class RemovePerfHandlerCommand extends RuntimeCommand {

    private static final String PROCESSINSTANCE_STATE_UPDATED = "PROCESSINSTANCE_STATE_UPDATED";

    private static final String ACTIVITYINSTANCE_STATE_UPDATED = "ACTIVITYINSTANCE_STATE_UPDATED";

    @Override
    public Serializable execute(final Map parameters, final ServiceAccessor serviceAccessor)
            throws SCommandExecutionException {
        JMSProducer.resetInstance();

        final EventService eventService = serviceAccessor.getEventService();

        // Default: remove all the concerned handlers
        // TODO : remove specific handlers (those who have been created in addPerf and not others)
        removeAllHandlers(eventService, PROCESSINSTANCE_STATE_UPDATED, ProcessInstanceFinishedHandler.class);
        removeAllHandlers(eventService, ACTIVITYINSTANCE_STATE_UPDATED, TaskReadyHandler.class);
        removeAllHandlers(eventService, ACTIVITYINSTANCE_STATE_UPDATED, FlowNodeReachStateHandler.class);

        return null;
    }

    private void removeAllHandlers(final EventService eventService, final String eventType, final Class clazz) {
        final Set> handlers = eventService.getHandlers(eventType);
        Collection> removeCandidates = new LinkedList>();

        if (handlers != null) {
            for (final Iterator> iter = handlers.iterator(); iter.hasNext();) {
                final SHandler handler = iter.next();
                if (clazz.isInstance(handler)) {
                    removeCandidates.add(handler);
                }
            }
            handlers.removeAll(removeCandidates);
        }
    }

}