/*
    * Copyright 2007 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 1.0 (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/ecl1.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.krad.maintenance;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.util.RiceKeyConstants;
  import org.kuali.rice.kew.api.WorkflowDocument;
  import org.kuali.rice.krad.document.MaintenanceDocument;
  import org.kuali.rice.krad.exception.KualiExceptionIncident;
  import org.kuali.rice.krad.exception.ValidationException;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.util.KRADConstants;
  import org.kuali.rice.krad.util.UrlFactory;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * Provides static utility methods for use within the maintenance framework
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class MaintenanceUtils {
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(MaintenanceUtils.class);
  
      /**
       * Determines if there is another maintenance document that has a lock on the same key as the given document, and
       * therefore will block the maintenance document from being submitted
       *
       * @param document - maintenance document instance to check locking for
       * @param throwExceptionIfLocked - indicates if an exception should be thrown in the case of found locking document,
       * if false only an error will be added
       */
      public static void checkForLockingDocument(MaintenanceDocument document, boolean throwExceptionIfLocked) {
          LOG.info("starting checkForLockingDocument (by MaintenanceDocument)");
  
          // get the docHeaderId of the blocking docs, if any are locked and blocking
          //String blockingDocId = getMaintenanceDocumentService().getLockingDocumentId(document);
          String blockingDocId = document.getNewMaintainableObject().getLockingDocumentId();
          checkDocumentBlockingDocumentId(blockingDocId, throwExceptionIfLocked);
      }
  
      public static void checkDocumentBlockingDocumentId(String blockingDocId, boolean throwExceptionIfLocked) {
          // if we got nothing, then no docs are blocking, and we're done
          if (StringUtils.isBlank(blockingDocId)) {
              return;
          }
  
          if (MaintenanceUtils.LOG.isInfoEnabled()) {
              MaintenanceUtils.LOG.info("Locking document found:  docId = " + blockingDocId + ".");
          }
  
          // load the blocking locked document
          WorkflowDocument lockedDocument = null;
          try {
              // need to perform this check to prevent an exception from being thrown by the
              // createWorkflowDocument call - the throw itself causes transaction rollback problems to
              // occur, even though the exception would be caught here
              if (KRADServiceLocatorWeb.getWorkflowDocumentService().workflowDocumentExists(blockingDocId)) {
                  lockedDocument = KRADServiceLocatorWeb.getWorkflowDocumentService()
                          .loadWorkflowDocument(blockingDocId, GlobalVariables.getUserSession().getPerson());
              }
          } catch (Exception ex) {
              // clean up the lock and notify the admins
              MaintenanceUtils.LOG.error("Unable to retrieve locking document specified in the maintenance lock table: " +
                      blockingDocId, ex);
  
              cleanOrphanLocks(blockingDocId, ex);
              return;
          }
          if (lockedDocument == null) {
              MaintenanceUtils.LOG.warn("Locking document header for " + blockingDocId + "came back null.");
              cleanOrphanLocks(blockingDocId, null);
          }
  
          // if we can ignore the lock (see method notes), then exit cause we're done
          if (lockCanBeIgnored(lockedDocument)) {
              return;
          }
  
          // build the link URL for the blocking document
          Properties parameters = new Properties();
          parameters.put(KRADConstants.PARAMETER_DOC_ID, blockingDocId);
         parameters.put(KRADConstants.PARAMETER_COMMAND, KRADConstants.METHOD_DISPLAY_DOC_SEARCH_VIEW);
         String blockingUrl = UrlFactory.parameterizeUrl(
                 KRADServiceLocator.getKualiConfigurationService().getPropertyString(KRADConstants.WORKFLOW_URL_KEY) +
                         "/" + KRADConstants.DOC_HANDLER_ACTION, parameters);
         if (MaintenanceUtils.LOG.isDebugEnabled()) {
             MaintenanceUtils.LOG.debug("blockingUrl = '" + blockingUrl + "'");
             MaintenanceUtils.LOG.debug("Maintenance record: " + lockedDocument.getApplicationDocumentId() + "is locked.");
         }
         String[] errorParameters = {blockingUrl, blockingDocId};
 
         // If specified, add an error to the ErrorMap and throw an exception; otherwise, just add a warning to the ErrorMap instead.
         if (throwExceptionIfLocked) {
             // post an error about the locked document
             GlobalVariables.getMessageMap()
                     .putError(KRADConstants.GLOBAL_ERRORS, RiceKeyConstants.ERROR_MAINTENANCE_LOCKED, errorParameters);
             throw new ValidationException("Maintenance Record is locked by another document.");
         } else {
             // Post a warning about the locked document.
             GlobalVariables.getMessageMap()
                     .putWarning(KRADConstants.GLOBAL_MESSAGES, RiceKeyConstants.WARNING_MAINTENANCE_LOCKED,
                             errorParameters);
         }
     }
 
     /**
      * Guesses whether the current user should be allowed to change a document even though it is locked. It
      * probably should use Authorization instead? See KULNRVSYS-948
      *
      * @param lockedDocument
      * @return
      * @throws org.kuali.rice.kew.exception.WorkflowException
      *
      */
     private static boolean lockCanBeIgnored(WorkflowDocument lockedDocument) {
         // TODO: implement real authorization for Maintenance Document Save/Route - KULNRVSYS-948
         if (lockedDocument == null) {
             return true;
         }
 
         // get the user-id. if no user-id, then we can do this test, so exit
         String userId = GlobalVariables.getUserSession().getPrincipalId().trim();
         if (StringUtils.isBlank(userId)) {
             return false; // dont bypass locking
         }
 
         // if the current user is not the initiator of the blocking document
         if (!userId.equalsIgnoreCase(lockedDocument.getInitiatorPrincipalId().trim())) {
             return false;
         }
 
         // if the blocking document hasn't been routed, we can ignore it
         return lockedDocument.isInitiated();
     }
 
     protected static void cleanOrphanLocks(String lockingDocumentNumber, Exception workflowException) {
         // put a try/catch around the whole thing - the whole reason we are doing this is to prevent data errors
         // from stopping a document
         try {
             // delete the locks for this document since it does not seem to exist
             KRADServiceLocatorWeb.getMaintenanceDocumentService().deleteLocks(lockingDocumentNumber);
             // notify the incident list
             Map<String, String> parameters = new HashMap<String, String>(1);
             parameters.put(KRADConstants.PARAMETER_DOC_ID, lockingDocumentNumber);
             KualiExceptionIncident kei = KRADServiceLocatorWeb.getKualiExceptionIncidentService()
                     .getExceptionIncident(workflowException, parameters);
             KRADServiceLocatorWeb.getKualiExceptionIncidentService().report(kei);
         } catch (Exception ex) {
             MaintenanceUtils.LOG.error("Unable to delete and notify upon locking document retrieval failure.", ex);
         }
     }
 
     public static boolean isMaintenanceDocumentCreatingNewRecord(String maintenanceAction) {
         if (KRADConstants.MAINTENANCE_EDIT_ACTION.equalsIgnoreCase(maintenanceAction)) {
             return false;
         } else if (KRADConstants.MAINTENANCE_NEWWITHEXISTING_ACTION.equalsIgnoreCase(maintenanceAction)) {
             return false;
         } else if (KRADConstants.MAINTENANCE_DELETE_ACTION.equalsIgnoreCase(maintenanceAction)) {
             return false;
         } else if (KRADConstants.MAINTENANCE_NEW_ACTION.equalsIgnoreCase(maintenanceAction)) {
             return true;
         } else if (KRADConstants.MAINTENANCE_COPY_ACTION.equalsIgnoreCase(maintenanceAction)) {
             return true;
         } else {
             return true;
         }
     }
 }