/*
 * 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.rule.ruletrigger;

import java.util.Set;

import org.alfresco.repo.node.NodeServicePolicies;
import org.alfresco.repo.policy.JavaBehaviour;
import org.alfresco.repo.policy.Behaviour.NotificationFrequency;
import org.alfresco.repo.rule.RuntimeRuleService;
import org.alfresco.repo.transaction.TransactionalResourceHelper;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * We use this specialised trigger for create node beaucse of a problem with the CIFS integration.
 * <p>
 * The create node trigger will only be fired if the object is NOT a sub-type of content.
 * <p>
 * Policy names supported are:
 * <ul>
 *   <li>{@linkplain NodeServicePolicies.OnCreateChildAssociationPolicy}</li>
 *   <li>{@linkplain NodeServicePolicies.BeforeDeleteChildAssociationPolicy}</li>
 *   <li>{@linkplain NodeServicePolicies.OnCreateNodePolicy}</li>
 * </ul>
 * 
 * @author Roy Wetherall
 */
public class CreateNodeRuleTrigger extends RuleTriggerAbstractBase
        implements NodeServicePolicies.OnCreateNodePolicy
{
    private static Log logger = LogFactory.getLog(CreateNodeRuleTrigger.class);
    
    private static final String POLICY = "onCreateNode";
    
    private static final QName ASPECT_NO_CONTENT = QName.createQName(NamespaceService.SYSTEM_MODEL_1_0_URI, "noContent");
    
    /** Indicates whether this is a class behaviour or not */
    private boolean isClassBehaviour = false;
	
    /** Runtime rule service */
	RuntimeRuleService runtimeRuleService;
    
	/**
	 * Set whether this is a class behaviour or not
	 */
    public void setIsClassBehaviour(boolean isClassBehaviour)
    {
        this.isClassBehaviour = isClassBehaviour;
    }

    /**
     * Set the rule service
     */
    public void setRuntimeRuleService(RuntimeRuleService runtimeRuleService)
    {
        this.runtimeRuleService = runtimeRuleService;
    }
    
    /**
     * {@inheritDoc}
     */
	public void registerRuleTrigger()
	{
		if (isClassBehaviour == true)
		{
			this.policyComponent.bindClassBehaviour(
					QName.createQName(NamespaceService.ALFRESCO_URI, POLICY), 
					this, 
					new JavaBehaviour(this, POLICY));
		}
		else
		{
			this.policyComponent.bindAssociationBehaviour(
					QName.createQName(NamespaceService.ALFRESCO_URI, POLICY), 
					this, 
					new JavaBehaviour(this, POLICY));
		}	
		
		// Register interest in the addition and removal of the sys:noContent aspect
		this.policyComponent.bindClassBehaviour(
		        NodeServicePolicies.OnAddAspectPolicy.QNAME, 
		        ASPECT_NO_CONTENT, 
		        new JavaBehaviour(this, "onAddAspect", NotificationFrequency.EVERY_EVENT));
		this.policyComponent.bindClassBehaviour(
                NodeServicePolicies.OnRemoveAspectPolicy.QNAME, 
                ASPECT_NO_CONTENT, 
                new JavaBehaviour(this, "onRemoveAspect", NotificationFrequency.EVERY_EVENT));
	}
    
    /**
     * {@inheritDoc}
     */
    public void onCreateNode(ChildAssociationRef childAssocRef)
    {
        // Break out early if rules are not enabled
        if (!areRulesEnabled())
        {
            return;
        }
        NodeRef nodeRef = childAssocRef.getChildRef();

        // Keep track of new nodes to prevent firing of updates in the same transaction
        Set<NodeRef> newNodeRefSet = TransactionalResourceHelper.getSet(RULE_TRIGGER_NEW_NODES);
        newNodeRefSet.add(nodeRef);
        
        if (nodeRef != null && 
            nodeService.exists(nodeRef) == true &&
            nodeService.hasAspect(nodeRef, ASPECT_NO_CONTENT) == false)
        {
            NodeRef parentNodeRef = childAssocRef.getParentRef();
            
            if (logger.isDebugEnabled() == true)
            {
                logger.debug(
                        "Create node rule trigger fired for parent node " + 
                        this.nodeService.getType(parentNodeRef).toString() + " " + parentNodeRef + 
                        " and child node " +
                        this.nodeService.getType(nodeRef).toString() + " " + nodeRef);
            }
            
            triggerRules(parentNodeRef, nodeRef);
        }
    }

    /**
     * On add aspect behaviour
     */
    public void onAddAspect(NodeRef nodeRef, QName aspectTypeQName)
    {
        if (!nodeService.exists(nodeRef))
        {
            return;
        }
        if (logger.isDebugEnabled() == true)
        {
            logger.debug(
                    "Removing the pending rules for the node " + 
                    nodeRef.toString() + 
                    " since the noContent aspect has been applied.");
        }
        
        // Removes any rules that have already been triggered for that node
        runtimeRuleService.removeRulePendingExecution(nodeRef);
    }
    
    /**
     * On remove aspect behaviour
     */
    public void onRemoveAspect(NodeRef nodeRef, QName aspectTypeQName)
    {
        if (!nodeService.exists(nodeRef))
        {
            return;
        }
        // We can assume it is the primary parent since it is only in the CIFS use case this aspect
        // is added.  It's added during create, therefore we must be talking about the primary parent
        NodeRef parentNodeRef = nodeService.getPrimaryParent(nodeRef).getParentRef();
        
        if (logger.isDebugEnabled() == true)
        {
            logger.debug(
                    "Create node rule trigger fired for parent node " + 
                    this.nodeService.getType(parentNodeRef).toString() + " " + parentNodeRef + 
                    " and child node " +
                    this.nodeService.getType(nodeRef).toString() + " " + nodeRef + 
                    " (this was triggered on removal of the noContent aspect)");
        }
        
        triggerRules(parentNodeRef, nodeRef);
    }
}