package org.kuali.student.lum.program.client.major;

 import com.google.gwt.event.shared.HandlerManager;

 import org.kuali.student.common.ui.client.application.ViewContext;

 import org.kuali.student.common.ui.client.mvc.DataModel;

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

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

 import org.kuali.student.lum.program.client.events.ProgramViewEvent;

 import org.kuali.student.lum.program.client.major.edit.MajorEditController;

 import org.kuali.student.lum.program.client.major.view.MajorViewController;

 import org.kuali.student.lum.program.client.variation.edit.VariationEditController;

 import org.kuali.student.lum.program.client.variation.view.VariationViewController;

 import org.kuali.student.lum.program.client.versions.ProgramVersionsController;

 import org.kuali.student.lum.program.client.widgets.ProgramSideBar;

 /**

  * @author Igor

  */

 public class MajorManager {

     private MajorViewController majorViewController;

     private MajorEditController majorEditController;

     private VariationViewController variationViewController;

     private VariationEditController variationEditController;

     private ProgramVersionsController programVersionsController;

     protected DataModel programModel;

     private ViewContext viewContext = new ViewContext();

     private static HandlerManager eventBus;

     public MajorManager() {

         eventBus = new HandlerManager(null);

         programModel = new DataModel();

         ProgramRegistry.getSpecializationHandlers().clear();

     }

     public MajorViewController getProgramViewController() {

         programModel.resetRoot();

         getMajorViewController();

         eventBus.fireEvent(new ProgramViewEvent());

         return majorViewController;

     }

     public VariationViewController getVariationViewController() {

         DataModel variationModel = new DataModel();

         variationModel.setDefinition(programModel.getDefinition());

         variationModel.setRoot(ProgramRegistry.getData());

         variationViewController = new VariationViewController(variationModel, viewContext, eventBus, majorViewController);

         return variationViewController;

     }

     public VariationEditController getVariationEditController() {

         DataModel variationModel = new DataModel();

         variationModel.setDefinition(programModel.getDefinition());

         variationModel.setRoot(ProgramRegistry.getData());

         ProgramUtils.unregisterUnusedHandlers(eventBus);

         variationEditController = new VariationEditController(variationModel, viewContext, eventBus, majorEditController);

         return variationEditController;

     }

     public MajorEditController getProgramEditController() {

         programModel.resetRoot();

         return getMajorEditController();

     }

     public ProgramVersionsController getProgramVersionsController() {

         if (programVersionsController == null) {

             programVersionsController = new ProgramVersionsController(programModel, ProgramSideBar.Type.MAJOR, viewContext, eventBus);

         }

         return programVersionsController;

     }

     public static HandlerManager getEventBus() {

         return eventBus;

     }

     private MajorEditController getMajorEditController() {

         if (majorEditController == null) {

             majorEditController = new MajorEditController(programModel, viewContext, eventBus);

         }

         return majorEditController;

     }

     private MajorViewController getMajorViewController() {

         if (majorViewController == null) {

             majorViewController = new MajorViewController(programModel, viewContext, eventBus);

         }

         return majorViewController;

     }

 }