package org.kuali.student.lum.program.client.variation.edit;

 import java.util.ArrayList;

 import java.util.List;

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

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

 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.HasCrossConstraints;

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

 import org.kuali.student.common.ui.client.mvc.history.HistoryManager;

 import org.kuali.student.common.ui.client.widgets.KSButton;

 import org.kuali.student.common.ui.client.widgets.KSButtonAbstract;

 import org.kuali.student.common.ui.client.widgets.notification.KSNotification;

 import org.kuali.student.common.ui.client.widgets.notification.KSNotifier;

 import org.kuali.student.common.validation.dto.ValidationResultInfo;

 import org.kuali.student.lum.common.client.widgets.AppLocations;

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

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

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

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

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

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

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

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

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

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

 import org.kuali.student.lum.program.client.major.MajorController;

 import org.kuali.student.lum.program.client.major.proposal.MajorProposalController;

 import org.kuali.student.lum.program.client.variation.VariationController;

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

 import com.google.gwt.core.client.GWT;

 import com.google.gwt.event.dom.client.ClickEvent;

 import com.google.gwt.event.dom.client.ClickHandler;

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

 import com.google.gwt.user.client.Window;

 /**

  * @author Igor

  */

 public class VariationEditController extends VariationController {

     private final KSButton saveButton = new KSButton(getLabel(ProgramMsgConstants.COMMON_SAVE));

     private final KSButton cancelButton = new KSButton(getLabel(ProgramMsgConstants.COMMON_CANCEL), KSButtonAbstract.ButtonStyle.ANCHOR_LARGE_CENTERED);

     private String currentId;

     public VariationEditController(DataModel programModel, ViewContext viewContext, HandlerManager eventBus, MajorController majorController) {

         super(programModel, viewContext, eventBus, majorController);

         configurer = GWT.create(VariationEditConfigurer.class);

         sideBar.setState(ProgramSideBar.State.EDIT);

         if (getStringProperty(ProgramConstants.ID) != null) {

             setDefaultView(ProgramSections.SUMMARY);

         }

         initHandlers();

     }

     private void initHandlers() {

         saveButton.addClickHandler(new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 doSave();

             }

         });

         cancelButton.addClickHandler(new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 doCancel();

             }

         });

         ModelLoadedEvent.Handler modelLoadedHandler = new ModelLoadedEvent.Handler() {

             @Override

             public void onEvent(ModelLoadedEvent event) {

                 DataModel dataModel = event.getModel();

                 Data variationMap = dataModel.get(ProgramConstants.VARIATIONS);

                 if (variationMap != null) {

                     int row = 0;

                     for (Data.Property property : variationMap) {

                         final Data variationData = property.getValue();

                         if (variationData.get(ProgramConstants.ID).equals(currentId)) {

                             programModel.setRoot(variationData);

                             ProgramRegistry.setData(variationData);

                             ProgramRegistry.setRow(row);

                             setContentTitle(getProgramName());

                             row++;

                             return;

                         }

                     }

                 }

             }

         };

         ProgramRegistry.addHandler(ModelLoadedEvent.TYPE, modelLoadedHandler);

         eventBus.addHandler(ModelLoadedEvent.TYPE, modelLoadedHandler);

         ChangeViewEvent.Handler changeViewHandler = new ChangeViewEvent.Handler() {

             @Override

             public void onEvent(ChangeViewEvent event) {

                 Enum<?> viewToken = event.getViewToken();

                 if (!viewToken.name().equals(ProgramSections.SPECIALIZATIONS_EDIT.name())) {

                     showView(viewToken);

                 }

             }

         };

         ProgramRegistry.addHandler(ChangeViewEvent.TYPE, changeViewHandler);

         eventBus.addHandler(ChangeViewEvent.TYPE, changeViewHandler);

         eventBus.addHandler(SpecializationCreatedEvent.TYPE, new SpecializationCreatedEvent.Handler() {

             @Override

             public void onEvent(SpecializationCreatedEvent event) {

                 programModel.getRoot().set(ProgramConstants.ID, event.getSpecializationId());

                 showWarnings();

             }

         });

         eventBus.addHandler(SpecializationUpdateEvent.TYPE, new SpecializationUpdateEvent.Handler() {

             @Override

             public void onEvent(SpecializationUpdateEvent event) {

                 // update our model to the updated specialization

                 // gotta find it first

                 String currSpecializationId = programModel.getRoot().get(ProgramConstants.ID);

                 for (Data.Property prop : event.getSpecializations()) {

                     String specId = (String) ((Data) prop.getValue()).get(ProgramConstants.ID);

                     if (null != specId && specId.equals(currSpecializationId) && prop.getValueType().equals(Data.class)) {

                         // found it

                         programModel.setRoot((Data) prop.getValue());

                         showView(getCurrentViewEnum());

                     }

                 }

                 //update with any new warnings that exist on specialization

                 showWarnings();

             }

         });

         StoreSpecRequirementIDsEvent.Handler requirementsHandler = new StoreSpecRequirementIDsEvent.Handler() {

             @Override

             public void onEvent(StoreSpecRequirementIDsEvent event) {

                 final String programId = event.getProgramId();

                 final List<String> ids = event.getProgramRequirementIds();

                 requestModel(new ModelRequestCallback<DataModel>() {

                     @Override

                     public void onModelReady(final DataModel model) {

                         Data programRequirements = null;

                         // find the specialization that we need to update

                         //for (Data.Property property : model.getRoot()) {

                         Data variationData = model.getRoot();

                         if (variationData.get(ProgramConstants.ID).equals(programId)) {

                             variationData.set(ProgramConstants.PROGRAM_REQUIREMENTS, new Data());

                             programRequirements = variationData.get(ProgramConstants.PROGRAM_REQUIREMENTS);

                             // break;

                         }

                         // }

                         if (programRequirements == null) {

                             Window.alert("Cannot find program requirements in data model.");

                             GWT.log("Cannot find program requirements in data model", null);

                             return;

                         }

                         for (String id : ids) {

                             programRequirements.add(id);

                         }

                         doSave();

                     }

                     @Override

                     public void onRequestFail(Throwable cause) {

                         GWT.log("Unable to retrieve model for validation and save", cause);

                     }

                 });

             }

         };

         ProgramRegistry.addHandler(StoreSpecRequirementIDsEvent.TYPE, requirementsHandler);

         eventBus.addHandler(StoreSpecRequirementIDsEvent.TYPE, requirementsHandler);

     }

     @Override

     protected void fireUpdateEvent(Callback<Boolean> okToChange) {

         doSave(okToChange);

     }

     private void doSave(final Callback<Boolean> okToChange) {

         requestModel(new ModelRequestCallback<DataModel>() {

             @Override

             public void onModelReady(final DataModel model) {

                 VariationEditController.this.updateModelFromCurrentView();

                 model.setParentPath(ProgramConstants.VARIATIONS + "/" + ProgramRegistry.getRow());

                 model.validate(new Callback<List<ValidationResultInfo>>() {

                     @Override

                     public void exec(List<ValidationResultInfo> results) {

                         boolean isSectionValid = isValid(results, true);

                         if (isSectionValid) {

                             saveData(model);

                             okToChange.exec(true);

                         } else {

                             okToChange.exec(false);

                             KSNotifier.add(new KSNotification("Unable to save, please check fields for errors.", false, true, 5000));

                         }

                     }

                 });

             }

             @Override

             public void onRequestFail(Throwable cause) {

                 GWT.log("Unable to retrieve model for validation and save", cause);

             }

         });

     }

     @Override

     protected void configureView() {

         super.configureView();

         if (!initialized) {

             List<Enum<?>> excludedViews = new ArrayList<Enum<?>>();

             excludedViews.add(ProgramSections.PROGRAM_REQUIREMENTS_EDIT);

             excludedViews.add(ProgramSections.SUPPORTING_DOCUMENTS_EDIT);

             excludedViews.add(ProgramSections.SUMMARY);

             addCommonButton(getLabel(ProgramMsgConstants.PROGRAM_MENU_SECTIONS), saveButton, excludedViews);

             addCommonButton(getLabel(ProgramMsgConstants.PROGRAM_MENU_SECTIONS), cancelButton, excludedViews);

             initialized = true;

         }

     }

     @Override

     protected void resetModel() {

         currentId = getStringProperty(ProgramConstants.ID);

         programModel.resetRoot();

     }

     private void doCancel() {

        navigateToParent(ProgramSections.SUMMARY);

     }

     @Override

     protected void doSave() {

         doSave(NO_OP_CALLBACK);

     }

     private void saveData(DataModel model) {

         currentId = model.get(ProgramConstants.ID);

         eventBus.fireEvent(new SpecializationSaveEvent(model.getRoot()));

         setContentTitle(getProgramName());

         setName(getProgramName());

         resetFieldInteractionFlag();

     }

     @Override

     protected void navigateToParent() {

         navigateToParent(ProgramSections.SPECIALIZATIONS_EDIT);

     }

     private void navigateToParent(ProgramSections parentSection) {

             String appLoc = "";

             if(!(majorController instanceof MajorProposalController))

                     appLoc = AppLocations.Locations.EDIT_PROGRAM_SPEC.getLocation();

             else

                     appLoc = AppLocations.Locations.PROGRAM_PROPOSAL.getLocation();

         String path = HistoryManager.appendContext(appLoc, getViewContext()) + "/" + parentSection;

         HistoryManager.navigate(path);

     }

         @Override

         public void beforeShow(final Callback<Boolean> onReadyCallback) {

             //clear all cross constraints that start with variations

             Application.getApplicationContext().clearCrossConstraintsWithStartingPath(null,ProgramConstants.VARIATIONS);

             //Set the context parent path so the proper mapping is retained 

             String newParentPath = ProgramConstants.VARIATIONS+"/"+org.kuali.student.lum.program.client.ProgramRegistry.getRow()+"/";

             Application.getApplicationContext().setParentPath(newParentPath);

             //This callback restricts values displayed in widget (eg. dropdowns, pickers) based on a cross field selection

             //and updates the warning messages displayed for the variation. A callback is used since we need the parent 

             //ProgramController to finish configuring the view before proceeding.

                 Callback<Boolean> finalizeVariationView = new Callback<Boolean>(){

                         public void exec(Boolean result) {

                         //Update widgets with constraints

                                 for(HasCrossConstraints crossConstraint:Application.getApplicationContext().getCrossConstraints(null)){

                                 crossConstraint.reprocessWithUpdatedConstraints();

                         }

                         onReadyCallback.exec(result);

                         }

         };

                 super.beforeShow(finalizeVariationView);

         }

         //Before show is called before the model is bound to the widgets. We need to update cross constraints after widget binding

         //This gets called twice which is not optimal

         @Override

         public <V extends Enum<?>> void showView(V viewType,

                         final Callback<Boolean> onReadyCallback) {

                 Callback<Boolean> updateCrossConstraintsCallback = new Callback<Boolean>(){

                         public void exec(Boolean result) {

                                 onReadyCallback.exec(result);

                         showWarnings();        

                         }

         };

                 super.showView(viewType, updateCrossConstraintsCallback);

         }

 }