/**

  * 

  */

 package org.kuali.student.lum.workflow;

 import java.util.Iterator;

 import java.util.List;

 import javax.xml.namespace.QName;

 import org.apache.commons.lang.StringUtils;

 import org.kuali.rice.core.resourceloader.GlobalResourceLoader;

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

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

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

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

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

 import org.kuali.student.common.dto.DtoConstants;

 import org.kuali.student.common.exceptions.OperationFailedException;

 import org.kuali.student.core.proposal.dto.ProposalInfo;

 import org.kuali.student.core.statement.dto.ReqComponentInfo;

 import org.kuali.student.core.statement.dto.StatementTreeViewInfo;

 import org.kuali.student.lum.course.dto.CourseInfo;

 import org.kuali.student.lum.course.service.CourseService;

 import org.kuali.student.lum.course.service.CourseServiceConstants;

 import org.springframework.transaction.annotation.Transactional;

 /**

  * A base post processor class for Course document types in Workflow.

  *

  */

 @Transactional(readOnly=true, rollbackFor={Throwable.class})

 public class CoursePostProcessorBase extends KualiStudentPostProcessorBase {

     private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(CoursePostProcessorBase.class);

     private CourseService courseService;

     @Override

     protected void processWithdrawActionTaken(ActionTakenEvent actionTakenEvent, ProposalInfo proposalInfo) throws Exception {

         LOG.info("Will set CLU state to '" + DtoConstants.STATE_SUBMITTED + "'");

         CourseInfo courseInfo = getCourseService().getCourse(getCourseId(proposalInfo));

         updateCourse(actionTakenEvent, DtoConstants.STATE_SUBMITTED, courseInfo);

     }

     @Override

     protected boolean processCustomActionTaken(ActionTakenEvent actionTakenEvent, ActionTakenValue actionTaken, ProposalInfo proposalInfo) throws Exception {

         String cluId = getCourseId(proposalInfo);

         CourseInfo courseInfo = getCourseService().getCourse(cluId);

         updateCourse(actionTakenEvent, null, courseInfo);

         return true;

     }

     @Override

     protected boolean processCustomRouteStatusChange(DocumentRouteStatusChange statusChangeEvent, ProposalInfo proposalInfo) throws Exception {

         // update the course state if the cluState value is not null (allows for clearing of the state)

         String courseId = getCourseId(proposalInfo);

         CourseInfo courseInfo = getCourseService().getCourse(courseId);

         String courseState = getCluStateForRouteStatus(courseInfo.getState(), statusChangeEvent.getNewRouteStatus());

         updateCourse(statusChangeEvent, courseState, courseInfo);

         return true;

     }

     protected String getCourseId(ProposalInfo proposalInfo) throws OperationFailedException {

         if (proposalInfo.getProposalReference().size() != 1) {

             LOG.error("Found " + proposalInfo.getProposalReference().size() + " CLU objects linked to proposal with proposalId='" + proposalInfo.getId() + "'. Must have exactly 1 linked.");

             throw new OperationFailedException("Found " + proposalInfo.getProposalReference().size() + " CLU objects linked to proposal with docId='" + proposalInfo.getWorkflowId() + "' and proposalId='" + proposalInfo.getId() + "'. Must have exactly 1 linked.");

         }

         return proposalInfo.getProposalReference().get(0);

     }

     /**

      * @param currentCluState - the current state set on the CLU

      * @param newWorkflowStatusCode - the new route status code that is getting set on the workflow document

      * @return the CLU state to set or null if the CLU does not need it's state changed

      */

     protected String getCluStateForRouteStatus(String currentCluState, String newWorkflowStatusCode) {

         if (StringUtils.equals(KEWConstants.ROUTE_HEADER_SAVED_CD, newWorkflowStatusCode)) {

             return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_DRAFT);

         } else if (KEWConstants.ROUTE_HEADER_CANCEL_CD .equals(newWorkflowStatusCode)) {

             return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_DRAFT);

         } else if (KEWConstants.ROUTE_HEADER_ENROUTE_CD.equals(newWorkflowStatusCode)) {

             return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_SUBMITTED);

         } else if (KEWConstants.ROUTE_HEADER_DISAPPROVED_CD.equals(newWorkflowStatusCode)) {

             /* current requirements state that on a Withdraw (which is a KEW Disapproval) the 

              * CLU state should be submitted so no special handling required here

              */

             return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_SUBMITTED);

         } else if (KEWConstants.ROUTE_HEADER_PROCESSED_CD.equals(newWorkflowStatusCode)) {

             return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_APPROVED);

         } else if (KEWConstants.ROUTE_HEADER_EXCEPTION_CD.equals(newWorkflowStatusCode)) {

             return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_SUBMITTED);

         } else {

             // no status to set

             return null;

         }

     }

     /**

      * Default behavior is to return the <code>newCluState</code> variable only if it differs from the

      * <code>currentCluState</code> value. Otherwise <code>null</code> will be returned.

      */

     protected String getCourseStateFromNewState(String currentCourseState, String newCourseState) {

         if (LOG.isInfoEnabled()) {

             LOG.info("current CLU state is '" + currentCourseState + "' and new CLU state will be '" + newCourseState + "'");

         }

         return getStateFromNewState(currentCourseState, newCourseState);

     }

     @Transactional(readOnly=false)

     protected void updateCourse(IDocumentEvent iDocumentEvent, String courseState, CourseInfo courseInfo) throws Exception {

         // only change the state if the course is not currently set to that state

         boolean requiresSave = false;

         if (courseState != null) {

             if (LOG.isInfoEnabled()) {

                 LOG.info("Setting state '" + courseState + "' on CLU with cluId='" + courseInfo.getId() + "'");

             }

             courseInfo.setState(courseState);

             requiresSave = true;

         }

         if (LOG.isInfoEnabled()) {

             LOG.info("Running preProcessCluSave with cluId='" + courseInfo.getId() + "'");

         }

         requiresSave |= preProcessCourseSave(iDocumentEvent, courseInfo);

         if (requiresSave) {

             getCourseService().updateCourse(courseInfo);

             //For a newly approved course (w/no prior active versions), make the new course the current version.

             if (DtoConstants.STATE_APPROVED.equals(courseState) && courseInfo.getVersionInfo().getCurrentVersionStart() == null){

                     // TODO: set states of other approved courses to superseded                

                     // if current version's state is not active then we can set this course as the active course

                     if (!DtoConstants.STATE_ACTIVE.equals(getCourseService().getCourse(getCourseService().getCurrentVersion(CourseServiceConstants.COURSE_NAMESPACE_URI, courseInfo.getVersionInfo().getVersionIndId()).getId()).getState())) { 

                             getCourseService().setCurrentCourseVersion(courseInfo.getId(), null);

                     }

             }

             List<StatementTreeViewInfo> statementTreeViewInfos = courseService.getCourseStatements(courseInfo.getId(), null, null);

             statementTreeViewInfoStateSetter(courseInfo.getState(), statementTreeViewInfos.iterator());

             for(Iterator<StatementTreeViewInfo> it = statementTreeViewInfos.iterator(); it.hasNext();)

                         courseService.updateCourseStatement(courseInfo.getId(), it.next());

         }

     }

     protected boolean preProcessCourseSave(IDocumentEvent iDocumentEvent, CourseInfo courseInfo) {

         return false;

     }

     protected CourseService getCourseService() {

         if (this.courseService == null) {

             this.courseService = (CourseService) GlobalResourceLoader.getService(new QName("http://student.kuali.org/wsdl/course","CourseService")); 

         }

         return this.courseService;

     }

     /*

      * Recursively set state for StatementTreeViewInfo

      * TODO: We are not able to reuse the code in CourseStateUtil for dependency reason.

      */   

     public void statementTreeViewInfoStateSetter(String courseState, Iterator<StatementTreeViewInfo> itr) {

             while(itr.hasNext()) {

                 StatementTreeViewInfo statementTreeViewInfo = (StatementTreeViewInfo)itr.next();

                 statementTreeViewInfo.setState(courseState);

                 List<ReqComponentInfo> reqComponents = statementTreeViewInfo.getReqComponents();

                 for(Iterator<ReqComponentInfo> it = reqComponents.iterator(); it.hasNext();)

                         it.next().setState(courseState);

                 statementTreeViewInfoStateSetter(courseState, statementTreeViewInfo.getStatements().iterator());

         }

     }  

 }