/*
 * Copyright (C) 2005 Alfresco, Inc.
 *
 * Licensed under the Mozilla Public License version 1.1 
 * with a permitted attribution clause. You may obtain a
 * copy of the License at
 *
 *   http://www.alfresco.org/legal/license.txt
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the
 * License.
 */
package org.alfresco.web.bean;

import java.util.Map;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.model.ContentModel;
import org.alfresco.service.cmr.repository.CopyService;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;
import org.alfresco.web.bean.repository.Node;
import org.apache.log4j.Logger;

/**
 * Helper class for common Simple Workflow functionality.
 * <p>
 * This class should be replaced with calls to a WorkflowService once it is available.
 * 
 * @author Kevin Roast
 */
public class WorkflowUtil
{
   private static Logger logger = Logger.getLogger(WorkflowUtil.class);
   
   /**
    * Execute the Approve step for the Simple Workflow on a node.
    *  
    * @param ref           NodeRef to the node with the workflow
    * @param nodeService   NodeService instance
    * @param copyService   CopyService instance
    * 
    * @throws AlfrescoRuntimeException
    */
   public static void approve(NodeRef ref, NodeService nodeService, CopyService copyService)
      throws AlfrescoRuntimeException
   {
      Node docNode = new Node(ref);
      
      if (docNode.hasAspect(ContentModel.ASPECT_SIMPLE_WORKFLOW) == false)
      {
         throw new AlfrescoRuntimeException("Cannot approve a document that is not part of a workflow.");
      }
      
      // get the simple workflow aspect properties
      Map<String, Object> props = docNode.getProperties();
      
      Boolean approveMove = (Boolean)props.get(ContentModel.PROP_APPROVE_MOVE.toString());
      NodeRef approveFolder = (NodeRef)props.get(ContentModel.PROP_APPROVE_FOLDER.toString());
      
      // first we need to take off the simpleworkflow aspect
      nodeService.removeAspect(ref, ContentModel.ASPECT_SIMPLE_WORKFLOW);
      
      if (approveMove.booleanValue())
      {
         // move the document to the specified folder
         String qname = QName.createValidLocalName(docNode.getName());
         nodeService.moveNode(ref, approveFolder, ContentModel.ASSOC_CONTAINS,
               QName.createQName(NamespaceService.CONTENT_MODEL_1_0_URI, qname));
      }
      else
      {
         // copy the document to the specified folder
         String qname = QName.createValidLocalName(docNode.getName());
         copyService.copy(ref, approveFolder, ContentModel.ASSOC_CONTAINS,
               QName.createQName(NamespaceService.CONTENT_MODEL_1_0_URI, qname));
      }
      
      if (logger.isDebugEnabled())
      {
         String movedCopied = approveMove ? "moved" : "copied";
         logger.debug("Document has been approved and " + movedCopied + " to folder with id of " + 
               approveFolder.getId());
      }
   }
   
   /**
    * Execute the Reject step for the Simple Workflow on a node.
    *  
    * @param ref           NodeRef to the node with the workflow
    * @param nodeService   NodeService instance
    * @param copyService   CopyService instance
    * 
    * @throws AlfrescoRuntimeException
    */
   public static void reject(NodeRef ref, NodeService nodeService, CopyService copyService)
      throws AlfrescoRuntimeException
   {
      Node docNode = new Node(ref);
      
      if (docNode.hasAspect(ContentModel.ASPECT_SIMPLE_WORKFLOW) == false)
      {
         throw new AlfrescoRuntimeException("Cannot reject a document that is not part of a workflow.");
      }
      
      // get the simple workflow aspect properties
      Map<String, Object> props = docNode.getProperties();
      
      String rejectStep = (String)props.get(ContentModel.PROP_REJECT_STEP.toString());
      Boolean rejectMove = (Boolean)props.get(ContentModel.PROP_REJECT_MOVE.toString());
      NodeRef rejectFolder = (NodeRef)props.get(ContentModel.PROP_REJECT_FOLDER.toString());
      
      if (rejectStep == null && rejectMove == null && rejectFolder == null)
      {
         throw new AlfrescoRuntimeException("The workflow does not have a reject step defined,");
      }
      
      // first we need to take off the simpleworkflow aspect
      nodeService.removeAspect(ref, ContentModel.ASPECT_SIMPLE_WORKFLOW);
      
      if (rejectMove.booleanValue())
      {
         // move the document to the specified folder
         String qname = QName.createValidLocalName(docNode.getName());
         nodeService.moveNode(ref, rejectFolder, ContentModel.ASSOC_CONTAINS,
               QName.createQName(NamespaceService.CONTENT_MODEL_1_0_URI, qname));
      }
      else
      {
         // copy the document to the specified folder
         String qname = QName.createValidLocalName(docNode.getName());
         copyService.copy(ref, rejectFolder, ContentModel.ASSOC_CONTAINS,
               QName.createQName(NamespaceService.CONTENT_MODEL_1_0_URI, qname));
      }
      
      if (logger.isDebugEnabled())
      {
         String movedCopied = rejectMove ? "moved" : "copied";
         logger.debug("Document has been rejected and " + movedCopied + " to folder with id of " + 
               rejectFolder.getId());
      }
   }
}