/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco 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.
 *
 * Alfresco 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 Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.rendition.script;

import java.util.ArrayList;
import java.util.List;

import org.alfresco.repo.jscript.BaseScopableProcessorExtension;
import org.alfresco.repo.jscript.ChildAssociation;
import org.alfresco.repo.jscript.ScriptNode;
import org.alfresco.repo.jscript.ValueConverter;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.rendition.RenditionDefinition;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.namespace.QName;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Script object representing the rendition service.
 * 
 * @author Neil McErlean
 */
public class ScriptRenditionService extends BaseScopableProcessorExtension
{
    private static Log logger = LogFactory.getLog(ScriptRenditionService.class);
    
    /** The Services registry */
    private ServiceRegistry serviceRegistry;

    private final ValueConverter valueConverter = new ValueConverter();

    /**
     * Set the service registry
     * 
     * @param serviceRegistry the service registry.
     */
    public void setServiceRegistry(ServiceRegistry serviceRegistry)
    {
        this.serviceRegistry = serviceRegistry;
    }
    
    private RenditionDefinition loadRenditionDefinitionImpl(String shortFormQName)
    {
        QName renditionName = QName.createQName(shortFormQName, serviceRegistry.getNamespaceService());
        RenditionDefinition rendDef = serviceRegistry.getRenditionService().loadRenditionDefinition(renditionName);
        return rendDef;
    }

    /**
     * This method renders the specified source node using the specified saved
     * rendition definition.
     * @param sourceNode the source node to be rendered.
     * @param renditionDefshortQName the rendition definition to be used e.g. cm:doclib
     * @return the parent association of the rendition node.
     * @see org.alfresco.service.cmr.rendition.RenditionService#render(org.alfresco.service.cmr.repository.NodeRef, RenditionDefinition)
     */
    public ChildAssociation render(ScriptNode sourceNode, String renditionDefshortQName)
    {
        if (logger.isDebugEnabled())
        {
            StringBuilder msg = new StringBuilder();
            msg.append("Rendering source node '")
                .append(sourceNode)
                .append("' with renditionDef '").append(renditionDefshortQName)
                .append("'");
            logger.debug(msg.toString());
        }
        
        RenditionDefinition rendDef = loadRenditionDefinitionImpl(renditionDefshortQName);
        ChildAssociationRef result = this.serviceRegistry.getRenditionService().render(sourceNode.getNodeRef(), rendDef);
        
        if (logger.isDebugEnabled())
        {
            StringBuilder msg = new StringBuilder();
            msg.append("Rendition: ").append(result);
            logger.debug(msg.toString());
        }
        
        return (ChildAssociation)valueConverter.convertValueForScript(serviceRegistry, this.getScope(), null, result);
    }

    /**
     * This method gets all the renditions of the specified node.
     * 
     * @param node the source node
     * @return a list of parent associations for the renditions.
     * @see org.alfresco.service.cmr.rendition.RenditionService#getRenditions(org.alfresco.service.cmr.repository.NodeRef)
     */
    public ChildAssociation[] getRenditions(ScriptNode node)
    {
        List<ChildAssociationRef> renditions = this.serviceRegistry.getRenditionService().getRenditions(node.getNodeRef());

        ChildAssociation[] result = convertChildAssRefs(renditions);

        return result;
    }

    /**
     * This method gets all the renditions of the specified node filtered by
     * MIME-type prefix. Renditions whose MIME-type string startsWith the prefix
     * will be returned.
     * 
     * @param node the source node for the renditions
     * @param mimeTypePrefix a prefix to check against the rendition MIME-types.
     *            This must not be null and must not be an empty String
     * @return a list of parent associations for the filtered renditions.
     * @see org.alfresco.service.cmr.rendition.RenditionService#getRenditions(org.alfresco.service.cmr.repository.NodeRef)
     */
    public ChildAssociation[] getRenditions(ScriptNode node, String mimeTypePrefix)
    {
        List<ChildAssociationRef> renditions = this.serviceRegistry.getRenditionService().getRenditions(node.getNodeRef(), mimeTypePrefix);

        ChildAssociation[] result = convertChildAssRefs(renditions);
        
        return result;
    }

    /**
     * This method converts a list of (Java-ish) ChildAssociationRefs to an array
     * of (JavaScript-ish) ChildAssociations.
     * @param renditions
     * @return
     */
    private ChildAssociation[] convertChildAssRefs(
            List<ChildAssociationRef> renditions)
    {
        List<ChildAssociation> childAssocs = new ArrayList<ChildAssociation>(renditions.size());

        for (ChildAssociationRef chAssRef : renditions)
        {
            ChildAssociation chAss = (ChildAssociation)valueConverter.convertValueForScript(serviceRegistry, getScope(), null, chAssRef);
            childAssocs.add(chAss);
        }

        ChildAssociation[] result = childAssocs.toArray(new ChildAssociation[0]);
        return result;
    }

    /**
     * This method gets the rendition of the specified node identified by
     * the provided rendition name.
     * 
     * @param node the source node for the renditions
     * @param renditionName the renditionName used to identify a rendition. e.g. cm:doclib
     * @return the parent association for the rendition or <code>null</code> if there is no such rendition.
     * @see org.alfresco.service.cmr.rendition.RenditionService#getRenditionByName(org.alfresco.service.cmr.repository.NodeRef, QName)
     */
    public ChildAssociation getRenditionByName(ScriptNode node, String renditionName)
    {
        QName qname = QName.createQName(renditionName, serviceRegistry.getNamespaceService());
        ChildAssociationRef result = this.serviceRegistry.getRenditionService().getRenditionByName(node.getNodeRef(), qname);
        
        return (ChildAssociation) valueConverter.convertValueForScript(serviceRegistry, getScope(), null, result);
    }
}