package org.kuali.student.lum.program.client.core.view;

 import org.kuali.student.common.rice.authorization.PermissionType;

 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.core.CoreController;

 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;

 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;

 /**

  * @author Igor

  */

 public class CoreViewController extends CoreController 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.getValuesForCoreProgram(false));

     /**

      * Constructor.

      *

      * @param programModel

      */

     public CoreViewController(DataModel programModel, ViewContext viewContext, HandlerManager eventBus) {

         super(programModel, viewContext, eventBus);

         configurer = GWT.create(CoreViewConfigurer.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_CORE_PROGRAM.getLocation(), viewContext);

                 } 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_CORE_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>get(ProgramConstants.STATE));

         String versionIndId = programModel.get(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.getValuesForCoreProgram(isLatest));

                 }

             });

         } else {

             actionBox.setList(ActionType.getValuesForCoreProgram(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_CORE_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_CORE_PROGRAMS_SCREEN);

                         }        

                 });

         }

 }