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/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2014 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services 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 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services 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 library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see .
 */
package org.granite.tide.seam.lazy;

import java.io.Serializable;

import org.granite.config.ConvertersConfig;
import org.granite.context.GraniteContext;
import org.granite.messaging.amf.io.util.ClassGetter;
import org.granite.tide.TidePersistenceManager;
import org.hibernate.Session;
import org.jboss.seam.Entity;
import org.jboss.seam.util.Reflections;

/**
 * Manager responsible for the maintaining a reference for the HibernateContext. 
 * @author CIngram
 */
public class HibernateContextManager implements TidePersistenceManager {
	
	private Session session = null;
	
	public HibernateContextManager() {
		
	}
	
	public HibernateContextManager(Session session) {
		this.session = session;
	}
	
	/**
	 * Attach the passed in entity with the HibernateSession.
	 * @param entity
	 * @return the attached entity object
	 */
	public Object attachEntity(Object entity, String[] propertyNames) {
		Object attachedEntity = null;
        ClassGetter getter = ((ConvertersConfig)GraniteContext.getCurrentInstance().getGraniteConfig()).getClassGetter();
        
		try { 
		    attachedEntity = fetchEntity(entity, propertyNames);
			
			if (propertyNames != null) {
	            for (int i = 0; i < propertyNames.length; i++) {
	                Object initializedObj = Reflections.getGetterMethod(attachedEntity.getClass(), propertyNames[i]).invoke(attachedEntity);
	                
	                getter.initialize(entity, propertyNames[i], initializedObj);
			    }
			}
		} 
		catch(Exception e) {
			throw new RuntimeException("Unable to attach entity and init collection", e);
		}
		disconnectSession();
		
		return attachedEntity;
	}
	
	/**
	 * attaches the entity to the HibernateSession.
	 * @return the attached entity
	 */
	public Object fetchEntity(Object entity, String[] fetch) {
	    Serializable id = (Serializable)Entity.forClass(entity.getClass()).getIdentifier(entity);
	    if (id == null)
	        return null;
	    return session.get(entity.getClass(), id);
	}
    
	/**
	 * disconnects from the Hibernate Session.
	 */
	protected void disconnectSession() {
		session.disconnect();
	}
}