/*
 * 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 org.alfresco.repo.node.NodeServicePolicies;
import org.alfresco.repo.policy.JavaBehaviour;
import org.alfresco.repo.policy.Behaviour.NotificationFrequency;
import org.alfresco.repo.transaction.AlfrescoTransactionSupport;
import org.alfresco.service.cmr.dictionary.ClassDefinition;
import org.alfresco.service.cmr.dictionary.DataTypeDefinition;
import org.alfresco.service.cmr.dictionary.DictionaryService;
import org.alfresco.service.cmr.dictionary.PropertyDefinition;
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
{
    /**
     * The logger
     */
    private static Log logger = LogFactory.getLog(CreateNodeRuleTrigger.class);
    
    private static final String POLICY = "onCreateNode";
    
    private boolean isClassBehaviour = false;
	
	public void setIsClassBehaviour(boolean isClassBehaviour)
	{
		this.isClassBehaviour = isClassBehaviour;
	}
    
    DictionaryService dictionaryService;
    
    public void setDictionaryService(DictionaryService dictionaryService)
    {
        this.dictionaryService = dictionaryService;
    }

    /**
	 * @see org.alfresco.repo.rule.ruletrigger.RuleTrigger#registerRuleTrigger()
	 */
	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 of the inline editable aspect at the end of the transaction
		// NOTE: this work around is nessesary because we can't fire the rules directly since CIFS is not transactional
		policyComponent.bindClassBehaviour(
		        NodeServicePolicies.OnAddAspectPolicy.QNAME, 
		        this, 
		        new JavaBehaviour(this, "onAddAspect", NotificationFrequency.TRANSACTION_COMMIT));
		
	}
	
	// NOTE: this work around is nessesary because we can't fire the rules directly since CIFS is not transactional
	public void onAddAspect(NodeRef nodeRef, QName aspectTypeQName)
	{
	    if (nodeService.exists(nodeRef) == true)
	    {
    	    // See if we have created the node in this transaction
    	    if (AlfrescoTransactionSupport.getResource(nodeRef.toString()) != null)
    	    {
    	        Boolean value = (Boolean)nodeService.getProperty(nodeRef, QName.createQName(NamespaceService.APP_MODEL_1_0_URI, "editInline"));
    	        if (value != null)
    	        {
    	            boolean editInline = value.booleanValue();
    	            if (editInline == true)
    	            {
    	                // Then we should be triggering the rules
    	                NodeRef parentNodeRef = nodeService.getPrimaryParent(nodeRef).getParentRef();
    	                triggerRulesImpl(parentNodeRef, nodeRef);
    	            }
    	        }
    	    }
	    }
	}
    
    /**
     * {@inheritDoc}
     */
    public void onCreateNode(ChildAssociationRef childAssocRef)
    {
        // Only fire the rule if the node is question has no potential to contain content
        // TODO we need to find a better way to do this .. how can this be resolved in CIFS??
        boolean triggerRule = false;        
        NodeRef nodeRef = childAssocRef.getChildRef();
        QName type = this.nodeService.getType(nodeRef);
        ClassDefinition classDefinition = this.dictionaryService.getClass(type);
        if (classDefinition != null)
        {
            for (PropertyDefinition propertyDefinition : classDefinition.getProperties().values())
            {
                if (propertyDefinition.getDataType().getName().equals(DataTypeDefinition.CONTENT) == true)
                {
                    triggerRule = true;
                    break;
                }
            }
        }
        
        if (triggerRule == false)
        {
            triggerRulesImpl(childAssocRef.getParentRef(), childAssocRef.getChildRef());
        }
        
        // Regardless of whether the rule is triggered, mark this transaction as having created this node
        AlfrescoTransactionSupport.bindResource(childAssocRef.getChildRef().toString(), childAssocRef.getChildRef().toString());
    }
    
    /**
     * Trigger the rules with some log
     * 
     * @param parentNodeRef
     * @param childNodeRef
     */
    private void triggerRulesImpl(NodeRef parentNodeRef, NodeRef childNodeRef)
    {
        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(childNodeRef).toString() + " " + childNodeRef);
        }
        
        triggerRules(parentNodeRef, childNodeRef);
    }
}