/*

  * Copyright 2007 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.ken.postprocessor.kew;

 import org.apache.log4j.Logger;

 import org.kuali.rice.ken.bo.NotificationMessageDelivery;

 import org.kuali.rice.ken.core.GlobalNotificationServiceLocator;

 import org.kuali.rice.ken.deliverer.impl.KEWActionListMessageDeliverer;

 import org.kuali.rice.ken.service.NotificationMessageDeliveryService;

 import org.kuali.rice.ken.service.NotificationService;

 import org.kuali.rice.ken.util.NotificationConstants;

 import org.kuali.rice.ken.util.Util;

 import org.kuali.rice.kew.dto.ActionTakenEventDTO;

 import org.kuali.rice.kew.dto.AfterProcessEventDTO;

 import org.kuali.rice.kew.dto.BeforeProcessEventDTO;

 import org.kuali.rice.kew.dto.DeleteEventDTO;

 import org.kuali.rice.kew.dto.DocumentLockingEventDTO;

 import org.kuali.rice.kew.dto.DocumentRouteLevelChangeDTO;

 import org.kuali.rice.kew.dto.DocumentRouteStatusChangeDTO;

 import org.kuali.rice.kew.exception.WorkflowException;

 import org.kuali.rice.kew.postprocessor.PostProcessorRemote;

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

 import org.kuali.rice.kew.util.KEWConstants;

 import java.io.ByteArrayInputStream;

 import java.io.IOException;

 import java.rmi.RemoteException;

 import java.util.Properties;

 /**

  * This class is the post processor that gets run when workflow state changes occur for the 

  * underlying core NotificationDocumentType that all notifications go into KEW as.  This class is responsible for changing 

  * the state of the associated notification message delivery record after someone FYIs or ACKs their notification 

  * in the KEW Action List.

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

  */

 public class NotificationPostProcessor implements PostProcessorRemote {

     private static final Logger LOG = Logger.getLogger(NotificationPostProcessor.class);

     NotificationService notificationService;

     NotificationMessageDeliveryService msgDeliverySvc;

     /**

      * Constructs a NotificationPostProcessor instance.

      */

     public NotificationPostProcessor() {

         this.msgDeliverySvc = GlobalNotificationServiceLocator.getInstance().getNotificationMessageDeliveryService();

         this.notificationService = GlobalNotificationServiceLocator.getInstance().getNotificationService();

     }

     /**

      * Need to intercept ACKNOWLEDGE or FYI actions taken on notification workflow documents and set the local state of the 

      * Notification to REMOVED as well.

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#doActionTaken(org.kuali.rice.kew.dto.ActionTakenEventDTO)

      */

     public boolean doActionTaken(ActionTakenEventDTO event) throws RemoteException {

         LOG.debug("ENTERING NotificationPostProcessor.doActionTaken() for Notification action item with document ID: " + event.getDocumentId());

         // NOTE: this action could be happening because the user initiated it via KEW, OR because a dismiss or autoremove action

         // has been invoked programmatically and the KEWActionListMessageDeliverer is taking an action...so there is a risk of being

         // invoked recursively (which will lead to locking issues and other problems).  We therefore mark the document in the KEWActionList

         // MessageDeliverer before performing an action, so that we can detect this scenario here, and avoid invoking KEN again.

         LOG.debug("ACTION TAKEN=" + event.getActionTaken().getActionTaken());

         String actionTakenCode = event.getActionTaken().getActionTaken();

         Properties p = new Properties();

         WorkflowDocument doc;

         try {

                 doc = WorkflowDocument.loadDocument(event.getActionTaken().getPrincipalId(), event.getDocumentId());

         } catch (WorkflowException we) {

             throw new RuntimeException("Could not create document", we);

         }

         try {

             p.load(new ByteArrayInputStream(doc.getAttributeContent().getBytes()));

         } catch (IOException ioe) {

             throw new RuntimeException(ioe);

         }

         String internalCommand = p.getProperty(KEWActionListMessageDeliverer.INTERNAL_COMMAND_FLAG);

         if (Boolean.valueOf(internalCommand)) {

             LOG.info("Internal command detected by NotificationPostProcessor - will not invoke KEN");

             return true;

         }

         LOG.info("NotificationPostProcessor detected end-user action " + event.getActionTaken().getActionTaken() + " on document " + event.getActionTaken().getDocumentId());

         if(actionTakenCode.equals(KEWConstants.ACTION_TAKEN_ACKNOWLEDGED_CD) || actionTakenCode.equals(KEWConstants.ACTION_TAKEN_FYI_CD)) {

             LOG.debug("User has taken either acknowledge or fy action (action code=" + actionTakenCode + 

                     ") for Notification action item with document ID: " + event.getDocumentId() + 

             ".  We are now changing the status of the associated NotificationMessageDelivery to REMOVED.");

             try {

                 NotificationMessageDelivery nmd = msgDeliverySvc.getNotificationMessageDeliveryByDelivererId(event.getDocumentId());

                 if (nmd == null) {

                     throw new RuntimeException("Could not find message delivery from workflow document " + event.getDocumentId() + " to dismiss");

                 }

                 //get the id of the associated notification message delivery record

                 String cause;

                 if (KEWConstants.ACTION_TAKEN_ACKNOWLEDGED_CD.equals(actionTakenCode)) {

                     cause = NotificationConstants.ACK_CAUSE;

                 } else if (KEWConstants.ACTION_TAKEN_FYI_CD.equals(actionTakenCode)) {

                     cause = NotificationConstants.FYI_CAUSE;

                 } else {

                     cause = "unknown";

                 }

                 LOG.info("Dismissing message id " + nmd.getId() + " due to cause: " + cause);

                 notificationService.dismissNotificationMessageDelivery(nmd.getId(),

                         Util.getNotificationSystemUser(),

                         cause);

             } catch(Exception e) {

                 throw new RuntimeException("Error dismissing message", e);

             }

         }

         LOG.debug("LEAVING NotificationPostProcessor.doActionTaken() for Notification action item with document ID: " + event.getDocumentId());

         return true;

     }

     /**

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#doDeleteRouteHeader(org.kuali.rice.kew.dto.DeleteEventDTO)

      */

     public boolean doDeleteRouteHeader(DeleteEventDTO arg0) throws RemoteException {

         return true;

     }

     /**

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#doRouteLevelChange(org.kuali.rice.kew.dto.DocumentRouteLevelChangeDTO)

      */

     public boolean doRouteLevelChange(DocumentRouteLevelChangeDTO arg0) throws RemoteException {

         return true;

     }

     /**

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#doRouteStatusChange(org.kuali.rice.kew.dto.DocumentRouteStatusChangeDTO)

      */

     public boolean doRouteStatusChange(DocumentRouteStatusChangeDTO arg0) throws RemoteException {

         return true;

     }

     /**

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#beforeProcess(org.kuali.rice.kew.dto.BeforeProcessEventDTO)

      */

     public boolean beforeProcess(BeforeProcessEventDTO beforeProcessEvent) throws Exception {

         return true;

     }

     /**

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#afterProcess(org.kuali.rice.kew.dto.AfterProcessEventDTO)

      */

     public boolean afterProcess(AfterProcessEventDTO afterProcessEvent) throws Exception {

         return true;

     }

     /**

      * @see org.kuali.rice.kew.postprocessor.PostProcessorRemote#getDocumentIdsToLock(org.kuali.rice.kew.dto.DocumentLockingEventDTO)

      */

         public String[] getDocumentIdsToLock(DocumentLockingEventDTO documentLockingEvent) throws Exception {

                 return null;

         }

 }