/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.kew.actions;

 import java.util.Collection;

 import java.util.HashSet;

 import java.util.List;

 import java.util.Set;

 import org.apache.log4j.MDC;

 import org.kuali.rice.kew.actionrequest.ActionRequestValue;

 import org.kuali.rice.kew.actionrequest.Recipient;

 import org.kuali.rice.kew.actiontaken.ActionTakenValue;

 import org.kuali.rice.kew.api.action.MovePoint;

 import org.kuali.rice.kew.api.document.DocumentOrchestrationQueue;

 import org.kuali.rice.kew.api.document.DocumentProcessingOptions;

 import org.kuali.rice.kew.api.exception.InvalidActionTakenException;

 import org.kuali.rice.kew.engine.RouteContext;

 import org.kuali.rice.kew.engine.node.RouteNode;

 import org.kuali.rice.kew.engine.node.RouteNodeInstance;

 import org.kuali.rice.kew.messaging.MessageServiceNames;

 import org.kuali.rice.kew.routeheader.DocumentRouteHeaderValue;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.api.KewApiConstants;

 import org.kuali.rice.kim.api.identity.principal.PrincipalContract;

 /**

  * Returns a document to a previous node in the route.

  *

  * Current implementation only supports returning to a node on the main branch of the

  * document.

  *

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class MoveDocumentAction extends ActionTakenEvent {

     protected final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(getClass());

     private MovePoint movePoint;

     public MoveDocumentAction(DocumentRouteHeaderValue routeHeader, PrincipalContract principal) {

         super(KewApiConstants.ACTION_TAKEN_MOVE_CD, routeHeader, principal);

     }

     public MoveDocumentAction(DocumentRouteHeaderValue routeHeader, PrincipalContract principal, String annotation, MovePoint movePoint) {

         super(KewApiConstants.ACTION_TAKEN_MOVE_CD, routeHeader, principal, annotation);

         this.movePoint = movePoint;

     }

     /* (non-Javadoc)

      * @see org.kuali.rice.kew.actions.ActionTakenEvent#isActionCompatibleRequest(java.util.List)

      */

     @Override

     public String validateActionRules() {

         return validateActionRules(getActionRequestService().findAllPendingRequests(routeHeader.getDocumentId()), KEWServiceLocator.getRouteNodeService().getActiveNodeInstances(getRouteHeader().getDocumentId()));

     }

     @Override

         public String validateActionRules(List<ActionRequestValue> actionRequests) {

         return validateActionRules(actionRequests, KEWServiceLocator.getRouteNodeService().getActiveNodeInstances(getRouteHeader().getDocumentId()));

         }

     private String validateActionRules(List<ActionRequestValue> actionRequests, Collection activeNodes) {

         if (!getRouteHeader().isValidActionToTake(getActionPerformedCode())) {

             return "Document is not in a state to be moved";

         }

         if (activeNodes.isEmpty()) {

             return "Document has no active nodes.";

         }

         List<ActionRequestValue> filteredActionRequests = filterActionRequestsByCode(actionRequests, KewApiConstants.ACTION_REQUEST_COMPLETE_REQ);

         if (!isActionCompatibleRequest(filteredActionRequests)) {

             return "No request for the user is compatible with the MOVE action";

         }

         return "";

     }

     /* (non-Javadoc)

      * @see org.kuali.rice.kew.actions.ActionTakenEvent#isActionCompatibleRequest(java.util.List)

      */

     public boolean isActionCompatibleRequest(List<ActionRequestValue> requests) {

         //Move is always correct because the client application has authorized it

         return true;

     }

     public void recordAction() throws InvalidActionTakenException {

         MDC.put("docId", getRouteHeader().getDocumentId());

         updateSearchableAttributesIfPossible();

         LOG.debug("Moving document " + getRouteHeader().getDocumentId() + " to point: " + displayMovePoint(movePoint) + ", annotation: " + annotation);

         List actionRequests = getActionRequestService().findAllValidRequests(getPrincipal().getPrincipalId(), getDocumentId(), KewApiConstants.ACTION_REQUEST_COMPLETE_REQ);

         Collection activeNodes = KEWServiceLocator.getRouteNodeService().getActiveNodeInstances(getRouteHeader().getDocumentId());

         String errorMessage = validateActionRules(actionRequests,activeNodes);

         if (!org.apache.commons.lang.StringUtils.isEmpty(errorMessage)) {

             throw new InvalidActionTakenException(errorMessage);

         }

             RouteNodeInstance startNodeInstance = determineStartNode(activeNodes, movePoint);

             LOG.debug("Record the move action");

             Recipient delegator = findDelegatorForActionRequests(actionRequests);

             ActionTakenValue actionTaken = saveActionTaken(delegator);

             getActionRequestService().deactivateRequests(actionTaken, actionRequests);

             notifyActionTaken(actionTaken);

             // TODO this whole bit is a bit hacky at the moment

             if (movePoint.getStepsToMove() > 0) {

                 Set<String> targetNodeNames = new HashSet<String>();

                 targetNodeNames.add(determineFutureNodeName(startNodeInstance, movePoint));

                     final boolean shouldIndex = getRouteHeader().getDocumentType().hasSearchableAttributes() && RouteContext.getCurrentRouteContext().isSearchIndexingRequestedForContext();

                     DocumentOrchestrationQueue orchestrationQueue = MessageServiceNames.getDocumentOrchestrationQueue(

                         routeHeader);

                 org.kuali.rice.kew.api.document.OrchestrationConfig orchestrationConfig =

                     org.kuali.rice.kew.api.document.OrchestrationConfig.create(actionTaken.getActionTakenId(), targetNodeNames);

                 DocumentProcessingOptions options = DocumentProcessingOptions.create(true, shouldIndex, false);

                 orchestrationQueue.orchestrateDocument(routeHeader.getDocumentId(), getPrincipal().getPrincipalId(), orchestrationConfig, options);

             } else {

                 String targetNodeName = determineReturnNodeName(startNodeInstance, movePoint);

                 ReturnToPreviousNodeAction returnAction = new ReturnToPreviousNodeAction(KewApiConstants.ACTION_TAKEN_MOVE_CD, getRouteHeader(), getPrincipal(), annotation, targetNodeName, false);

                 returnAction.recordAction();

             }

     }

     private RouteNodeInstance determineStartNode(Collection<RouteNodeInstance> activeNodes, MovePoint movePoint) throws InvalidActionTakenException {

         RouteNodeInstance startNodeInstance = null;

         for (RouteNodeInstance nodeInstance : activeNodes)

         {

             if (nodeInstance.getName().equals(movePoint.getStartNodeName()))

             {

                 if (startNodeInstance != null)

                 {

                     throw new InvalidActionTakenException("More than one active node exists with the given name:  " + movePoint.getStartNodeName());

                 }

                 startNodeInstance = nodeInstance;

             }

         }

         if (startNodeInstance == null) {

             throw new InvalidActionTakenException("Could not locate an active node with the given name: " + movePoint.getStartNodeName());

         }

         return startNodeInstance;

     }

     private String determineFutureNodeName(RouteNodeInstance startNodeInstance, MovePoint movePoint) throws InvalidActionTakenException {

         return determineFutureNodeName(startNodeInstance.getRouteNode(), movePoint, 0, new HashSet());

     }

     private String determineFutureNodeName(RouteNode node, MovePoint movePoint, int currentStep, Set nodesProcessed) throws InvalidActionTakenException {

         if (nodesProcessed.contains(node.getRouteNodeId())) {

             throw new InvalidActionTakenException("Detected a cycle at node " + node.getRouteNodeName() + " when attempting to move document.");

         }

         nodesProcessed.add(node.getRouteNodeId());

         if (currentStep == movePoint.getStepsToMove()) {

             return node.getRouteNodeName();

         }

         List nextNodes = node.getNextNodes();

         if (nextNodes.size() == 0) {

             throw new InvalidActionTakenException("Could not proceed forward, there are no more nodes in the route.  Halted on step " + currentStep);

         }

         if (nextNodes.size() != 1) {

             throw new InvalidActionTakenException("Cannot move forward in a multi-branch path.  Located "+nextNodes.size()+" branches.  Halted on step " + currentStep);

         }

         return determineFutureNodeName((RouteNode)nextNodes.get(0), movePoint, currentStep+1, nodesProcessed);

     }

     private String determineReturnNodeName(RouteNodeInstance startNodeInstance, MovePoint movePoint) throws InvalidActionTakenException {

         return determineReturnNodeName(startNodeInstance.getRouteNode(), movePoint, 0);

     }

     private String determineReturnNodeName(RouteNode node, MovePoint movePoint, int currentStep) throws InvalidActionTakenException {

         if (currentStep == movePoint.getStepsToMove()) {

             return node.getRouteNodeName();

         }

         List previousNodes = node.getPreviousNodes();

         if (previousNodes.size() == 0) {

             throw new InvalidActionTakenException("Could not locate the named target node in the document's past route.  Halted on step " + currentStep);

         }

         if (previousNodes.size() != 1) {

             throw new InvalidActionTakenException("Located a multi-branch path, could not proceed backward past this point.  Halted on step " + currentStep);

         }

         return determineReturnNodeName((RouteNode)previousNodes.get(0), movePoint, currentStep-1);

     }

     private String displayMovePoint(MovePoint movePoint) {

         return "fromNode="+movePoint.getStartNodeName()+", stepsToMove="+movePoint.getStepsToMove();

     }

 }