package org.kuali.student.lum.workflow;
   
   import javax.xml.namespace.QName;
   
   import org.apache.commons.lang.StringUtils;
   import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
   import org.kuali.rice.kew.api.KewApiConstants;
   import org.kuali.rice.kew.api.action.ActionTaken;
   import org.kuali.rice.kew.framework.postprocessor.ActionTakenEvent;
  import org.kuali.rice.kew.framework.postprocessor.DocumentRouteStatusChange;
  import org.kuali.student.r2.core.atp.service.AtpService;
  import org.kuali.student.r2.common.dto.DtoConstants;
  import org.kuali.student.r2.common.exceptions.OperationFailedException;
  import org.kuali.student.r2.common.util.AttributeHelper;
  import org.kuali.student.r2.common.util.ContextUtils;
  import org.kuali.student.r2.common.util.constants.ProgramServiceConstants;
  import org.kuali.student.r2.core.proposal.dto.ProposalInfo;
  import org.kuali.student.r2.lum.program.service.ProgramService;
  import org.springframework.transaction.annotation.Transactional;
  
  @Transactional(readOnly=true, rollbackFor={Throwable.class})
  public class ProgramPostProcessorBase extends KualiStudentPostProcessorBase {
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(ProgramPostProcessorBase.class);
  
      private ProgramService programService;
  	private StateChangeService stateChangeService;
  
      @Override
      protected void processWithdrawActionTaken(ActionTakenEvent actionTakenEvent, ProposalInfo proposalInfo) throws Exception {
          LOG.info("Will set CLU state to '" + DtoConstants.STATE_DRAFT + "'");
          String programId = getProgramId(proposalInfo);
          getStateChangeService().changeState(programId, DtoConstants.STATE_DRAFT, ContextUtils.getContextInfo());
      }
  
      @Override
      protected boolean processCustomActionTaken(ActionTakenEvent actionTakenEvent,  ActionTaken actionTaken, ProposalInfo proposalInfo) throws Exception {
      	//TODO Why is this method implemented in course post processor? it might be important for program as well
          return true;
      }
  
      @Override
      protected boolean processCustomRouteStatusChange(DocumentRouteStatusChange statusChangeEvent, ProposalInfo proposalInfo) throws Exception {
          // update the program state based on the route status
      	// Mainly used to approve a proposal
          String programId = getProgramId(proposalInfo);
          String endEntryTerm = new AttributeHelper (proposalInfo.getAttributes()).get("prevEndProgramEntryTerm");
          String endEnrollTerm = new AttributeHelper (proposalInfo.getAttributes()).get("prevEndTerm");
          String endInstAdmitTerm = new AttributeHelper (proposalInfo.getAttributes()).get("prevEndInstAdmitTerm");
          getStateChangeService().changeState(endEntryTerm, endEnrollTerm, endInstAdmitTerm, programId, getCluStateForRouteStatus("",statusChangeEvent.getNewRouteStatus()), ContextUtils.getContextInfo());
          return true;
      }
  
      protected String getProgramId(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(KewApiConstants.ROUTE_HEADER_SAVED_CD, newWorkflowStatusCode)) {
              return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_DRAFT);
          } else if (KewApiConstants.ROUTE_HEADER_CANCEL_CD .equals(newWorkflowStatusCode)) {
              return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_NOT_APPROVED);
          } else if (KewApiConstants.ROUTE_HEADER_ENROUTE_CD.equals(newWorkflowStatusCode)) {
              return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_DRAFT);
          } else if (KewApiConstants.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_NOT_APPROVED);
          } else if (KewApiConstants.ROUTE_HEADER_PROCESSED_CD.equals(newWorkflowStatusCode)) {
              return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_ACTIVE);
          } else if (KewApiConstants.ROUTE_HEADER_EXCEPTION_CD.equals(newWorkflowStatusCode)) {
              return getCourseStateFromNewState(currentCluState, DtoConstants.STATE_DRAFT);
          } 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);
      }
  
  
     protected ProgramService getProgramService() {
         if (this.programService == null) {
             this.programService = (ProgramService) GlobalResourceLoader.getService(new QName(ProgramServiceConstants.PROGRAM_NAMESPACE,"ProgramService")); 
         }
         return this.programService;
     }
     
     
     protected StateChangeService getStateChangeService() {
         if (this.stateChangeService == null) {
         	MajorDisciplineStateChangeServiceImpl stateChangeService = new MajorDisciplineStateChangeServiceImpl();
             stateChangeService.setProgramService(getProgramService());
             stateChangeService.setAtpService((AtpService)GlobalResourceLoader.getService(new QName("http://student.kuali.org/wsdl/atp","AtpService")));
             this.stateChangeService = stateChangeService;
         }
         
         return this.stateChangeService;
     }
 }