/*
 * Copyright (C) 2005-2007 Alfresco Software Limited.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 General Public License for more details.

 * You should have received a copy of the GNU 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.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */
package org.alfresco.repo.cmis.rest;

import java.util.List;

import org.alfresco.cmis.CMISService;
import org.alfresco.cmis.CMISTypesFilterEnum;
import org.alfresco.repo.template.TemplateNode;
import org.alfresco.repo.web.scripts.RepositoryImageResolver;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.TemplateImageResolver;

import freemarker.ext.beans.BeanModel;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateScalarModel;

/**
 * Custom FreeMarker Template language method.
 * <p>
 * Lists the (CMIS) children of a TemplateNode
 * <p>
 * Usage: cmischildren(TemplateNode node)
 *        cmischildren(TemplateNode node, String typesFilter)
 *        
 * @author davidc
 */
public class CMISChildrenMethod implements TemplateMethodModelEx
{
    private CMISService cmisService;
    private ServiceRegistry serviceRegistry;
    private TemplateImageResolver imageResolver;
    
    /**
     * Construct
     */
    public CMISChildrenMethod(CMISService cmisService, ServiceRegistry serviceRegistry, RepositoryImageResolver imageResolver)
    {
        this.cmisService = cmisService;
        this.serviceRegistry = serviceRegistry;
        this.imageResolver = imageResolver.getImageResolver();
    }
    
    @SuppressWarnings("unchecked")
    public Object exec(List args) throws TemplateModelException
    {
        TemplateNode[] children = null;
        
        if (args.size() > 0)
        {
            Object arg0 = args.get(0);
            if (arg0 instanceof BeanModel)
            {
                // extract node ref
                Object wrapped = ((BeanModel)arg0).getWrappedObject();
                if (wrapped != null)
                {
                    if (wrapped instanceof TemplateNode)
                    {
                        NodeRef nodeRef = ((TemplateNode)wrapped).getNodeRef();
                        CMISTypesFilterEnum typesFilter = CMISTypesFilterEnum.ANY;
                        if (args.size() > 1)
                        {
                            // extract types filter, if specified
                            Object arg1 = args.get(1);
                            if (arg1 instanceof TemplateScalarModel)
                            {
                                String typesFilterStr = ((TemplateScalarModel)arg1).getAsString();
                                if (typesFilterStr != null && typesFilterStr.length() > 0)
                                {
                                    typesFilter = (CMISTypesFilterEnum)CMISTypesFilterEnum.FACTORY.toEnum(typesFilterStr);
                                }
                            }
                        }
                        
                        // query children
                        NodeRef[] childNodeRefs = cmisService.getChildren(nodeRef, typesFilter);
                        children = new TemplateNode[childNodeRefs.length];
                        for (int i = 0; i < childNodeRefs.length; i++)
                        {
                            children[i] = new TemplateNode(childNodeRefs[i], serviceRegistry, imageResolver);
                        }
                    }
                }
            }
        }
        
        return children;
    }

}