package org.alfresco.repo.rule;

import java.util.List;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.repo.action.ParameterDefinitionImpl;
import org.alfresco.repo.action.executer.ActionExecuterAbstractBase;
import org.alfresco.service.cmr.action.Action;
import org.alfresco.service.cmr.action.ParameterDefinition;
import org.alfresco.service.cmr.dictionary.DataTypeDefinition;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.rule.Rule;
import org.alfresco.service.cmr.rule.RuleService;

/**
 * Action implementation to link the rules from one folder to another
 * 
 * @author Roy Wetherall
 */
public class LinkRules extends ActionExecuterAbstractBase
{
    /** Name and parameter constants */
    public static final String NAME = "link-rules";
    public static final String PARAM_LINK_FROM_NODE = "link_from_node";
    
    /** Node service */
    private NodeService nodeService;
    
    /** Runtime rule service */
    private RuntimeRuleService ruleService;
    
    /**
     * @param ruleService   rule service
     */
    public void setRuleService(RuntimeRuleService ruleService)
    {
        this.ruleService = ruleService;
    }
    
    /**
     * @param nodeService   node service
     */
    public void setNodeService(NodeService nodeService)
    {
        this.nodeService = nodeService;
    }
    
    /**
     * @see org.alfresco.repo.action.executer.ActionExecuterAbstractBase#executeImpl(org.alfresco.service.cmr.action.Action, org.alfresco.service.cmr.repository.NodeRef)
     */
    @Override
    protected void executeImpl(Action action, NodeRef actionedUponNodeRef)
    {
        if (nodeService.exists(actionedUponNodeRef) == true)
        {
            // Link to folder is passed as a parameter
              // this should have rules already specified
            NodeRef linkedFromNodeRef = (NodeRef)action.getParameterValue(PARAM_LINK_FROM_NODE);
            if (nodeService.hasAspect(linkedFromNodeRef, RuleModel.ASPECT_RULES) == false)
            {
                throw new AlfrescoRuntimeException("The link from node has no rules to link.");
            }
            
            // Check whether the node already has rules or not
            if (nodeService.hasAspect(actionedUponNodeRef, RuleModel.ASPECT_RULES) == true)
            {
                // Check for a linked to node
                NodeRef linkedToNode = ((RuleService)ruleService).getLinkedToRuleNode(actionedUponNodeRef);
                if (linkedToNode == null)
                {
                    // if the node has no rules we can delete the folder ready to link
                    List<Rule> rules = ((RuleService)ruleService).getRules(actionedUponNodeRef, false);
                    if (rules.isEmpty() == false)
                    {
                        // Can't link a node if it already has rules
                        throw new AlfrescoRuntimeException("The current folder has rules and can not be linked to another folder.");
                    }
                    else
                    {
                        // Delete the rules system folder
                        NodeRef ruleFolder = ruleService.getSavedRuleFolderAssoc(actionedUponNodeRef).getChildRef();
                        nodeService.deleteNode(ruleFolder);
                    }
                }
                else
                {
                    // Just remove the aspect and have the associated data automatically removed
                    nodeService.removeAspect(actionedUponNodeRef, RuleModel.ASPECT_RULES);
                }
                
            }
            
            // Create the destination folder as a secondary child of the first
            NodeRef ruleSetNodeRef = ruleService.getSavedRuleFolderAssoc(linkedFromNodeRef).getChildRef();
            // The required aspect will automatically be added to the node
            nodeService.addChild(actionedUponNodeRef, ruleSetNodeRef, RuleModel.ASSOC_RULE_FOLDER, RuleModel.ASSOC_RULE_FOLDER);
        }
    }

    /**
     * @see org.alfresco.repo.action.ParameterizedItemAbstractBase#addParameterDefinitions(java.util.List)
     */
    @Override
    protected void addParameterDefinitions(List<ParameterDefinition> paramList)
    {
        paramList.add(
                new ParameterDefinitionImpl(PARAM_LINK_FROM_NODE,
                DataTypeDefinition.NODE_REF, 
                true,
                getParamDisplayLabel(PARAM_LINK_FROM_NODE)));
    }
}