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

 import java.util.List;

 import java.util.Map;

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

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

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

 import org.kuali.student.common.ui.server.gwt.AbstractDataService;

 import org.kuali.student.lum.lu.service.LuService;

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

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

 import org.kuali.student.lum.program.service.ProgramService;

 /**

  * @author Igor

  */

 public class MajorDisciplineDataService extends AbstractDataService {

     private static final long serialVersionUID = 1L;

     private ProgramService programService;

     private LuService luService;

     @Override

     protected String getDefaultWorkflowDocumentType() {

         return null;

     }

     @Override

     protected String getDefaultMetaDataState() {

         return null;

     }

     @Override

     protected Object get(String id) throws Exception {

             //TODO Just Major Discipline for now - need to check for other types later

         MajorDisciplineInfo returnDTO;

         if (null == id || id.length() == 0) {

             returnDTO = new MajorDisciplineInfo();

             returnDTO.setType(ProgramClientConstants.MAJOR_PROGRAM);

             returnDTO.setState(DtoConstants.STATE_DRAFT);

             returnDTO.setCredentialProgramId(getCredentialId());

         } else {

             returnDTO = programService.getMajorDiscipline(id);

         }

         return returnDTO;

     }

     @Override

     protected Object save(Object dto, Map<String, Object> properties) throws Exception {

         if (dto instanceof MajorDisciplineInfo) {

             MajorDisciplineInfo mdInfo = (MajorDisciplineInfo) dto;

             if (mdInfo.getId() == null && mdInfo.getVersionInfo() != null) {

                     String majorVersionIndId = mdInfo.getVersionInfo().getVersionIndId();

                     mdInfo = programService.createNewMajorDisciplineVersion(majorVersionIndId, "New major discipline version");

             } else if (mdInfo.getId() == null){

                 mdInfo = programService.createMajorDiscipline(mdInfo);

             } else {

                 mdInfo = programService.updateMajorDiscipline(mdInfo);

             }

             return mdInfo;

         } else {

             throw new InvalidParameterException("Only persistence of MajorDiscipline is supported by this DataService implementation.");

         }

     }  

     @Override

     protected Class<?> getDtoClass() {

         return MajorDisciplineInfo.class;

     }

     private String getCredentialId() throws Exception {

             List<String> credIds = luService.getCluIdsByLuType(ProgramClientConstants.CREDENTIAL_BACCALAUREATE_PROGRAM, DtoConstants.STATE_ACTIVE);

             if (null == credIds || credIds.size() != 1) {

                 throw new OperationFailedException("A single credential program of type " + ProgramClientConstants.CREDENTIAL_BACCALAUREATE_PROGRAM + " is required; database contains " +

                                                     (null == credIds ? "0" : credIds.size() +

                                                     "."));

             }

             return credIds.get(0);

     }

     public void setProgramService(ProgramService programService) {

         this.programService = programService;

     }

     public void setLuService(LuService luService) {

         this.luService = luService;

     }

 }