/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
 *
 * 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; either version 3 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; with out 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 library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
package com.c2kernel.lifecycle.instance.predefined;

import java.util.Arrays;

import com.c2kernel.common.InvalidData;
import com.c2kernel.common.ObjectNotFound;
import com.c2kernel.common.PersistencyException;
import com.c2kernel.events.Event;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.outcome.Viewpoint;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;

public class WriteViewpoint extends PredefinedStep {

	public WriteViewpoint() {
		super();
	}

	@Override
	protected String runActivityLogic(AgentPath agent, ItemPath item,
			int transitionID, String requestData) throws InvalidData, ObjectNotFound, PersistencyException {
		
		String schemaName;
		String viewName;
		int evId;

        String[] params = getDataList(requestData);
        if (Logger.doLog(3)) Logger.msg(3, "WriteViewpoint: called by "+agent+" on "+item+" with parameters "+Arrays.toString(params));

        // outcometype, name and evId. Event and Outcome should be checked so schema version should be discovered.
        if (params.length != 3)
            throw new InvalidData("WriteViewpoint: Invalid parameters "+Arrays.toString(params));
        
        schemaName = params[0];
        viewName = params[1];

        try {
        	evId = Integer.parseInt(params[2]);
        } catch (NumberFormatException ex) {
        	throw new InvalidData("WriteViewpoint: Parameter 3 (EventId) must be an integer");
        }

        // Find event
        
        Event ev;
       	try {
			ev = (Event)Gateway.getStorage().get(item, ClusterStorage.HISTORY+"/"+evId, null);
		} catch (PersistencyException e) {
			Logger.error(e);
			throw new PersistencyException("WriteViewpoint: Could not load event "+evId);
		}
        
        // Write new viewpoint
        Viewpoint newView = new Viewpoint(item, schemaName, viewName, ev.getSchemaVersion(), evId);
        try {
			Gateway.getStorage().put(item, newView, null);
		} catch (PersistencyException e) {
			Logger.error(e);
			throw new PersistencyException("WriteViewpoint: Could not store new viewpoint");
		}
        return requestData;
	}

}