package org.kuali.student.lum.program.client.credential.view;
   
   import com.google.gwt.core.client.GWT;
   import com.google.gwt.event.dom.client.ChangeEvent;
   import com.google.gwt.event.dom.client.ChangeHandler;
   import com.google.gwt.event.shared.HandlerManager;
   
   import org.kuali.student.r2.common.util.ContextUtils;
   import org.kuali.student.common.ui.client.application.Application;
  import org.kuali.student.common.ui.client.application.KSAsyncCallback;
  import org.kuali.student.common.ui.client.application.ViewContext;
  import org.kuali.student.common.ui.client.mvc.Callback;
  import org.kuali.student.common.ui.client.mvc.DataModel;
  import org.kuali.student.common.ui.client.mvc.history.HistoryManager;
  import org.kuali.student.common.ui.client.security.AuthorizationCallback;
  import org.kuali.student.common.ui.client.security.RequiresAuthorization;
  import org.kuali.student.common.ui.shared.IdAttributes.IdType;
  import org.kuali.student.lum.common.client.lu.LUUIPermissions;
  import org.kuali.student.lum.common.client.widgets.AppLocations;
  import org.kuali.student.lum.common.client.widgets.DropdownList;
  import org.kuali.student.lum.program.client.ProgramConstants;
  import org.kuali.student.lum.program.client.ProgramRegistry;
  import org.kuali.student.lum.program.client.ProgramSections;
  import org.kuali.student.lum.program.client.ProgramStatus;
  import org.kuali.student.lum.program.client.credential.CredentialController;
  import org.kuali.student.lum.program.client.events.ModelLoadedEvent;
  import org.kuali.student.lum.program.client.events.ProgramViewEvent;
  import org.kuali.student.lum.program.client.major.ActionType;
  
  /**
   * @author Igor
   */
  public class CredentialViewController extends CredentialController implements RequiresAuthorization {
      /**
       * Initialize the action drop-down with a list of values.  Note that these values
       * will be changed further down in the code depending on if we are working with the latest 
       * version of the program.
       */
      private final DropdownList actionBox = new DropdownList(ActionType.getValuesForCredentialProgram(false));
  
      /**
       * Constructor.
       *
       * @param programModel
       */
      public CredentialViewController(DataModel programModel, ViewContext viewContext, HandlerManager eventBus) {
          super(programModel, viewContext, eventBus);
          configurer = GWT.create(CredentialViewConfigurer.class);
          bind();
      }
  
      private void bind() {
          actionBox.addChangeHandler(new ChangeHandler() {
              @Override
              public void onChange(ChangeEvent event) {
                  ActionType actionType = ActionType.of(actionBox.getSelectedValue());
                  ViewContext viewContext = getViewContext();
                  if (actionType == ActionType.MODIFY) {
                      ProgramRegistry.setSection(ProgramSections.getEditSection(getCurrentViewEnum()));
                      HistoryManager.navigate(AppLocations.Locations.EDIT_BACC_PROGRAM.getLocation(), getViewContext());
                  } else if (actionType == ActionType.MODIFY_VERSION) {
                      String versionIndId = getStringProperty(ProgramConstants.VERSION_IND_ID);
                      viewContext.setId(versionIndId);
                      viewContext.setIdType(IdType.COPY_OF_OBJECT_ID);
                      HistoryManager.navigate(AppLocations.Locations.EDIT_BACC_PROGRAM.getLocation(), viewContext);
                  }
              }
          });
          eventBus.addHandler(ProgramViewEvent.TYPE, new ProgramViewEvent.Handler() {
              @Override
              public void onEvent(ProgramViewEvent event) {
                  actionBox.setSelectedIndex(0);
              }
          });
          eventBus.addHandler(ModelLoadedEvent.TYPE, new ModelLoadedEvent.Handler() {
              @Override
              public void onEvent(ModelLoadedEvent event) {
                  resetActionList();
              }
          });
      }
  
      @Override
      protected void configureView() {
          super.configureView();
          addContentWidget(actionBox);
          initialized = true;
      }
  
      protected void resetActionList() {
          //Only allow modify with version option for an active course that id also the latest version
          ProgramStatus status = ProgramStatus.of(programModel);
          String versionIndId = getStringProperty(ProgramConstants.VERSION_IND_ID);
          Long sequenceNumber = programModel.get(ProgramConstants.VERSION_SEQUENCE_NUMBER);
  
          actionBox.clear();
          if (status == ProgramStatus.ACTIVE) {
              programRemoteService.isLatestVersion(versionIndId, sequenceNumber, new KSAsyncCallback<Boolean>() {
                  public void onSuccess(Boolean isLatest) {
                     actionBox.setList(ActionType.getValuesForCredentialProgram(isLatest));
                 }
             });
         } else {
             actionBox.setList(ActionType.getValuesForCredentialProgram(false));
         }
     }
     
     @Override
     public boolean isAuthorizationRequired() {
         return true;
     }
 
     @Override
     public void setAuthorizationRequired(boolean required) {
         throw new UnsupportedOperationException();
     }
     
     @Override
     public void checkAuthorization(final AuthorizationCallback authCallback) {
         Application.getApplicationContext().getSecurityContext().checkScreenPermission(LUUIPermissions.USE_VIEW_CREDENTIAL_PROGRAMS_SCREEN, new Callback<Boolean>() {
             @Override
             public void exec(Boolean result) {
 
                 final boolean isAuthorized = result;
             
                 if(isAuthorized){
                     authCallback.isAuthorized();
                 }
                 else
                     authCallback.isNotAuthorized("User is not authorized: " + LUUIPermissions.USE_VIEW_CREDENTIAL_PROGRAMS_SCREEN);
             }   
         });
     }
 }