/**
    * Copyright 2005-2012 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.engine.node;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.log4j.MDC;
  import org.kuali.rice.core.api.criteria.Predicate;
  import org.kuali.rice.core.api.criteria.QueryByCriteria;
  import org.kuali.rice.kew.actionitem.ActionItem;
  import org.kuali.rice.kew.actionrequest.ActionRequestValue;
  import org.kuali.rice.kew.api.action.ActionRequestStatus;
  import org.kuali.rice.kew.doctype.bo.DocumentType;
  import org.kuali.rice.kew.engine.RouteContext;
  import org.kuali.rice.kew.engine.RouteHelper;
  import org.kuali.rice.kew.exception.RouteManagerException;
  import org.kuali.rice.kew.api.exception.WorkflowException;
  import org.kuali.rice.kew.role.RoleRouteModule;
  import org.kuali.rice.kew.routeheader.DocumentRouteHeaderValue;
  import org.kuali.rice.kew.routemodule.RouteModule;
  import org.kuali.rice.kew.service.KEWServiceLocator;
  import org.kuali.rice.kew.util.ClassDumper;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.kuali.rice.kew.util.PerformanceLogger;
  import org.kuali.rice.kim.api.KimConstants;
  import org.kuali.rice.kim.api.responsibility.Responsibility;
  import org.kuali.rice.kim.api.services.KimApiServiceLocator;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  import static org.kuali.rice.core.api.criteria.PredicateFactory.and;
  import static org.kuali.rice.core.api.criteria.PredicateFactory.equal;
  
  /**
   * A node implementation which provides integration with KIM Roles for routing.
   * Essentially extends RequestsNode and provides a custom RouteModule
   * implementation.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   * 
   */
  public class RoleNode extends RequestsNode {
  
  	private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger
  			.getLogger( RoleNode.class );
  
  	@Override
  	protected RouteModule getRouteModule(RouteContext context) throws Exception {
  		return new RoleRouteModule();
  	}
  	
  	/**
  	 * @see org.kuali.rice.kew.engine.node.RequestsNode#processCustom(org.kuali.rice.kew.engine.RouteContext, org.kuali.rice.kew.engine.RouteHelper)
  	 */
  	@Override
  	protected boolean processCustom(RouteContext routeContext, RouteHelper routeHelper) throws Exception {
  		DocumentRouteHeaderValue document = routeContext.getDocument();
  		RouteNodeInstance nodeInstance = routeContext.getNodeInstance();
  		RouteNode node = nodeInstance.getRouteNode();
  		// while no routable actions are activated and there are more
  		// routeLevels to process
  		if ( nodeInstance.isInitial() ) {
  			if ( LOG.isDebugEnabled() ) {
  				LOG.debug( "RouteHeader info inside routing loop\n"
  						+ ClassDumper.dumpFields( routeContext.getDocument() ) );
  				LOG.debug( "Looking for new actionRequests - routeLevel: "
  						+ node.getRouteNodeName() );
  			}
  			boolean suppressPolicyErrors = isSupressingPolicyErrors( routeContext );
  			List<ActionRequestValue> requests = getNewActionRequests( routeContext );
  // Debugging code to force an empty action request				
  //				if ( document.getDocumentType().getName().equals( "SACC" ) ) {
  //					LOG.fatal( "DEBUGGING CODE IN PLACE - SACC DOCUMENT ACTION REQUESTS CLEARED" );
  //					requests.clear();
  //				}
  			// for mandatory routes, requests must be generated
  			if ( requests.isEmpty() && !suppressPolicyErrors) {
  				Responsibility resp = getFirstResponsibilityWithMandatoryRouteFlag( document, node );
  				if ( resp != null ) {
  					throw new RouteManagerException( "No requests generated for KIM Responsibility-based mandatory route.\n" +
  							"Document Id:    " + document.getDocumentId() + "\n" +
  							"DocumentType:   " + document.getDocumentType().getName() + "\n" +
  							"Route Node:     " + node.getRouteNodeName() + "\n" + 
 							"Responsibility: " + resp,
 							routeContext );
 				}
 			}
 			// determine if we have any approve requests for FinalApprover
 			// checks
 			if ( !suppressPolicyErrors ) {				
 				verifyFinalApprovalRequest( document, requests, nodeInstance, routeContext );
 			}
 		}
 		return true; // to indicate custom processing performed
 	}
 	
 	/**
 	 * Checks for any mandatory route responsibilities for the given document type and node.
 	 * 
 	 * Stops once it finds a responsibility for the document and node.
 	 */	
 	protected Responsibility getFirstResponsibilityWithMandatoryRouteFlag( DocumentRouteHeaderValue document, RouteNode node ) {
 		// iterate over the document hierarchy
 		// gather responsibilities - merge based on route level
 		DocumentType docType = document.getDocumentType();
 		while ( docType != null ) {
 			QueryByCriteria.Builder builder = QueryByCriteria.Builder.create();
             Predicate p = and(
                 equal("template.namespaceCode", KRADConstants.KUALI_RICE_WORKFLOW_NAMESPACE),
                 equal("template.name", KewApiConstants.DEFAULT_RESPONSIBILITY_TEMPLATE_NAME),
                 equal("active", "Y"),
                 equal("attributes[documentTypeName]", docType.getName()),
                 equal("attributes[routeNodeName]", node.getRouteNodeName())
             );
             builder.setPredicates(p);
 
             List<Responsibility> responsibilities = KimApiServiceLocator.getResponsibilityService().findResponsibilities(builder.build()).getResults();
             // once we find a responsibility, stop, since this overrides any parent
             // responsibilities for this node
             if ( !responsibilities.isEmpty() ) {
                 // if any has required=true - return true
                 for ( Responsibility resp : responsibilities ) {
                     if ( Boolean.parseBoolean( resp.getAttributes().get( KimConstants.AttributeConstants.REQUIRED ) ) ) {
                         return resp;
                     }
                 }
                 return null;
             }
 			docType = docType.getParentDocType();
 		}
 
 		return null;
 	}
 	
 	/**
 	 * Activates the action requests that are pending at this routelevel of the
 	 * document. The requests are processed by priority and then request ID. It
 	 * is implicit in the access that the requests are activated according to
 	 * the route level above all.
 	 * <p>
 	 * FYI and acknowledgment requests do not cause the processing to stop. Only
 	 * action requests for approval or completion cause the processing to stop
 	 * and then only for route level with a serialized activation policy. Only
 	 * requests at the current document's current route level are activated.
 	 * Inactive requests at a lower level cause a routing exception.
 	 * <p>
 	 * Exception routing and adhoc routing are processed slightly differently.
 	 * 
 	 * @return True if the any approval actions were activated.
 	 * @throws org.kuali.rice.kew.api.exception.ResourceUnavailableException
 	 * @throws WorkflowException
 	 */
 	@SuppressWarnings("unchecked")
 	public boolean activateRequests(RouteContext context, DocumentRouteHeaderValue document,
 			RouteNodeInstance nodeInstance) throws WorkflowException {
 		MDC.put( "docId", document.getDocumentId() );
 		PerformanceLogger performanceLogger = new PerformanceLogger( document.getDocumentId() );
 		List<ActionItem> generatedActionItems = new ArrayList<ActionItem>();
 		List<ActionRequestValue> requests = new ArrayList<ActionRequestValue>();
 		if ( context.isSimulation() ) {
 			for ( ActionRequestValue ar : context.getDocument().getActionRequests() ) {
 				// logic check below duplicates behavior of the
 				// ActionRequestService.findPendingRootRequestsByDocIdAtRouteNode(documentId,
 				// routeNodeInstanceId) method
 				if ( ar.getCurrentIndicator()
 						&& (ActionRequestStatus.INITIALIZED.getCode().equals( ar.getStatus() ) || ActionRequestStatus.ACTIVATED.getCode()
 								.equals( ar.getStatus() ))
 						&& ar.getNodeInstance().getRouteNodeInstanceId().equals(
 								nodeInstance.getRouteNodeInstanceId() )
 						&& ar.getParentActionRequest() == null ) {
 					requests.add( ar );
 				}
 			}
 			requests.addAll( context.getEngineState().getGeneratedRequests() );
 		} else {
 			requests = KEWServiceLocator.getActionRequestService()
 					.findPendingRootRequestsByDocIdAtRouteNode( document.getDocumentId(),
 							nodeInstance.getRouteNodeInstanceId() );
 		}
 		if ( LOG.isDebugEnabled() ) {
 			LOG.debug( "Pending Root Requests " + requests.size() );
 		}
 		boolean requestActivated = activateRequestsCustom( context, requests, generatedActionItems,
 				document, nodeInstance );
 		// now let's send notifications, since this code needs to be able to
 		// activate each request individually, we need
 		// to collection all action items and then notify after all have been
 		// generated
         notify(context, generatedActionItems, nodeInstance);
 
         performanceLogger.log( "Time to activate requests." );
 		return requestActivated;
 	}
 	
     protected static class RoleRequestSorter implements Comparator<ActionRequestValue> {
         public int compare(ActionRequestValue ar1, ActionRequestValue ar2) {
         	int result = 0;
         	// compare descriptions (only if both not null)
         	if ( ar1.getResponsibilityDesc() != null && ar2.getResponsibilityDesc() != null ) {
         		result = ar1.getResponsibilityDesc().compareTo( ar2.getResponsibilityDesc() );
         	}
             if ( result != 0 ) return result;
         	// compare priority
             result = ar1.getPriority().compareTo(ar2.getPriority());
             if ( result != 0 ) return result;
             // compare action request type
             result = ActionRequestValue.compareActionCode(ar1.getActionRequested(), ar2.getActionRequested(), true);
             if ( result != 0 ) return result;
             // compare action request ID
             if ( (ar1.getActionRequestId() != null) && (ar2.getActionRequestId() != null) ) {
                 result = ar1.getActionRequestId().compareTo(ar2.getActionRequestId());
             } else {
                 // if even one action request id is null at this point return then the two are equal
                 result = 0;
             }
             return result;
         }
     }
     protected static final Comparator<ActionRequestValue> ROLE_REQUEST_SORTER = new RoleRequestSorter();
 
 	
 	protected boolean activateRequestsCustom(RouteContext context,
 			List<ActionRequestValue> requests, List<ActionItem> generatedActionItems,
 			DocumentRouteHeaderValue document, RouteNodeInstance nodeInstance)
 			throws WorkflowException {
 		Collections.sort( requests, ROLE_REQUEST_SORTER );
 		String activationType = nodeInstance.getRouteNode().getActivationType();
 		boolean isParallel = KewApiConstants.ROUTE_LEVEL_PARALLEL.equals( activationType );
 		boolean requestActivated = false;
 		String groupToActivate = null;
 		Integer priorityToActivate = null;
 		for ( ActionRequestValue request : requests ) {
 			// if a request has already been activated and we are not parallel routing
 			// or in the simulator, break out of the loop and exit
 			if ( requestActivated
 					&& !isParallel
 					&& (!context.isSimulation() || !context.getActivationContext()
 							.isActivateRequests()) ) {
 				break;
 			}
 			if ( request.getParentActionRequest() != null || request.getNodeInstance() == null ) {
 				// 1. disregard request if it's not a top-level request
 				// 2. disregard request if it's a "future" request and hasn't
 				// been attached to a node instance yet
 				continue;
 			}
 			if ( request.isApproveOrCompleteRequest() ) {
 				boolean thisRequestActivated = false;
 				// capture the priority and grouping information for this request
 				// We only need this for Approval requests since FYI and ACK requests are non-blocking
 				if ( priorityToActivate == null ) {
 				 	priorityToActivate = request.getPriority();
 				}
 				if ( groupToActivate == null ) {
 					groupToActivate = request.getResponsibilityDesc();
 				}
 				// check that the given request is found in the current group to activate
 				// check priority and grouping from the request (stored in the responsibility description)
 				if ( StringUtils.equals( groupToActivate, request.getResponsibilityDesc() )
 						&& (
 								(priorityToActivate != null && request.getPriority() != null && priorityToActivate.equals(request.getPriority()))
 							||  (priorityToActivate == null && request.getPriority() == null)
 							)
 						) {
 					// if the request is already active, note that we have an active request
 					// and move on to the next request
 					if ( request.isActive() ) {
 						requestActivated = true;
 						continue;
 					}
 					logProcessingMessage( request );
 					if ( LOG.isDebugEnabled() ) {
 						LOG.debug( "Activating request: " + request );
 					}
 					// this returns true if any requests were activated as a result of this call
 					thisRequestActivated = activateRequest( context, request, nodeInstance,
 							generatedActionItems );
 					requestActivated |= thisRequestActivated;
 				}
 				// if this request was not activated and no request has been activated thus far
 				// then clear out the grouping and priority filters
 				// as this represents a case where the person with the earlier priority
 				// did not need to approve for this route level due to taking
 				// a prior action
 				if ( !thisRequestActivated && !requestActivated ) {
 					priorityToActivate = null;
 					groupToActivate = null;
 				}
 			} else {
 				logProcessingMessage( request );
 				if ( LOG.isDebugEnabled() ) {
 					LOG.debug( "Activating request: " + request );
 				}
 				requestActivated = activateRequest( context, request, nodeInstance,
 						generatedActionItems )
 						|| requestActivated;
 			}
 		}
 		return requestActivated;
 	}
 }