package org.kuali.student.lum.program.server.transform;

 import java.util.Map;

 import org.kuali.student.core.assembly.data.Data;

 import org.kuali.student.core.assembly.data.Metadata;

 import org.kuali.student.lum.program.client.ProgramConstants;

 import org.kuali.student.lum.program.dto.CredentialProgramInfo;

 /**

  * When credential program is activated this filter sets the previous version to superseded and updates the end program

  * entry and and enroll terms. 

  * 

  * @author Will

  *

  */

 public class VersionCredentialProgramFilter extends VersionProgramFilter {

         @Override

         public void applyOutboundDataFilter(Data data, Metadata metadata,

                         Map<String, Object> properties) throws Exception {

                 Data previousVersionData = (Data)properties.get(VersionProgramFilter.PREVIOUS_VERSION_DATA);

                 String versionFromId = data.query(ProgramConstants.VERSION_FROM_ID);

                 if (versionFromId != null){

                         CredentialProgramInfo previousVersionCoreInfo = programService.getCredentialProgram(versionFromId);

                         if (previousVersionData == null){

                                 //This is an initial get. Create previous version data to send back to client 

                                 previousVersionData = new Data();

                                 previousVersionData.set(ProgramConstants.ID, previousVersionCoreInfo.getId());

                                 previousVersionData.set(ProgramConstants.END_PROGRAM_ENTRY_TERM, previousVersionCoreInfo.getEndProgramEntryTerm());

                                 previousVersionData.set(ProgramConstants.END_PROGRAM_ENROLL_TERM, previousVersionCoreInfo.getEndTerm());

                                 previousVersionData.set(ProgramConstants.STATE, previousVersionCoreInfo.getState());

                         } else {

                                 //This is a save operation. Check state field change for previous version state, indicating an "Activate" action,

                                 //which requires updating previous program with new states and end terms and setting activated program

                                 //to be the current version.

                                 String state = previousVersionData.get(ProgramConstants.STATE);

                                 if (state!= null && !state.equals(previousVersionCoreInfo.getState())){

                                         //Update previous program version with new state and terms

                                         String endEntryTerm = previousVersionData.get(ProgramConstants.END_PROGRAM_ENTRY_TERM); 

                                         String endEnrollTerm = previousVersionData.get(ProgramConstants.END_PROGRAM_ENROLL_TERM);

                                         previousVersionCoreInfo.setState(state);

                                         previousVersionCoreInfo.setEndProgramEntryTerm(endEntryTerm);

                                         previousVersionCoreInfo.setEndTerm(endEnrollTerm);

                                         programService.updateCredentialProgram(previousVersionCoreInfo);

                                         //Set "activated" program to be the current version

                                         String activatedCoreId = data.get(ProgramConstants.ID);

                                         programService.setCurrentCredentialProgramVersion(activatedCoreId, null);

                                 }

                         }

                         data.set(PREVIOUS_VERSION_INFO, previousVersionData);

                 }                

         }

 }