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

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

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

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

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

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

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

 import org.kuali.student.common.ui.client.configurable.mvc.layouts.MenuSectionController;

 import org.kuali.student.common.ui.client.configurable.mvc.sections.Section;

 import org.kuali.student.common.ui.client.configurable.mvc.views.SectionView;

 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.DataModelDefinition;

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

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

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

 import org.kuali.student.common.ui.client.mvc.dto.ReferenceModel;

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

 import org.kuali.student.common.ui.client.service.DataSaveResult;

 import org.kuali.student.common.ui.client.util.ExportElement;

 import org.kuali.student.common.ui.client.util.ExportUtils;

 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.buttongroups.ButtonEnumerations;

 import org.kuali.student.common.ui.client.widgets.dialog.ButtonMessageDialog;

 import org.kuali.student.common.ui.client.widgets.field.layout.button.ButtonGroup;

 import org.kuali.student.common.ui.client.widgets.field.layout.button.YesNoCancelGroup;

 import org.kuali.student.common.ui.shared.IdAttributes;

 import org.kuali.student.common.ui.shared.IdAttributes.IdType;

 import org.kuali.student.core.comments.ui.client.widgets.commenttool.CommentTool;

 import org.kuali.student.lum.common.client.helpers.RecentlyViewedHelper;

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

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

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

 import org.kuali.student.lum.program.client.properties.ProgramProperties;

 import org.kuali.student.lum.program.client.rpc.AbstractCallback;

 import org.kuali.student.lum.program.client.rpc.MajorDisciplineRpcService;

 import org.kuali.student.lum.program.client.rpc.MajorDisciplineRpcServiceAsync;

 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.ui.Label;

 import com.google.gwt.user.client.ui.Widget;

 /**

  * @author Igor

  */

 public abstract class ProgramController extends MenuSectionController {

     protected MajorDisciplineRpcServiceAsync programRemoteService;

     protected boolean initialized = false;

     protected DataModel programModel;

     protected AbstractProgramConfigurer configurer;

     protected HandlerManager eventBus;

     protected Label statusLabel = new Label();

     protected ProgramSideBar sideBar;

     private boolean needToLoadOldModel = false;

     private ProgramStatus lastLoadedStatus;

     protected boolean reloadMetadata = false;

     protected boolean processBeforeShow = true;

     /**

      * Constructor.

      *

      * @param programModel

      */

     public ProgramController(String name, DataModel programModel, ViewContext viewContext, HandlerManager eventBus) {

         super();

         programRemoteService = createProgramRemoteService();

         this.eventBus = eventBus;

         this.programModel = programModel;

         setViewContext(viewContext);

         initializeModel();

     }

     /**

      * Create a ProgramRpcServiceAsync appropriate for this Controller

      */

     protected MajorDisciplineRpcServiceAsync createProgramRemoteService() {

         return GWT.create(MajorDisciplineRpcService.class);

     }

     @Override

     public void beforeViewChange(Enum<?> viewChangingTo, final Callback<Boolean> okToChange) {

         if (processBeforeShow) {

             super.beforeViewChange(viewChangingTo, new Callback<Boolean>() {

                 @Override

                 public void exec(Boolean result) {

                     if (result) {

                         if (getCurrentView() instanceof SectionView && ((SectionView) getCurrentView()).isDirty()) {

                             ButtonGroup<ButtonEnumerations.YesNoCancelEnum> buttonGroup = new YesNoCancelGroup();

                             final ButtonMessageDialog<ButtonEnumerations.YesNoCancelEnum> dialog = new ButtonMessageDialog<ButtonEnumerations.YesNoCancelEnum>("Warning", "You may have unsaved changes.  Save changes?", buttonGroup);

                             buttonGroup.addCallback(new Callback<ButtonEnumerations.YesNoCancelEnum>() {

                                 @Override

                                 public void exec(ButtonEnumerations.YesNoCancelEnum result) {

                                     switch (result) {

                                         case YES:

                                             dialog.hide();

                                             fireUpdateEvent(okToChange);

                                             break;

                                         case NO:

                                             dialog.hide();

                                             resetModel();

                                             needToLoadOldModel = true;

                                             resetFieldInteractionFlag();

                                             okToChange.exec(true);

                                             break;

                                         case CANCEL:

                                             okToChange.exec(false);

                                             dialog.hide();

                                             // Because this event fires after the history change event we need to "undo" the history events. 

                                             HistoryManager.logHistoryChange();  

                                             break;

                                     }

                                 }

                             });

                             dialog.show();

                         } else {

                             okToChange.exec(true);

                         }

                     } else {

                         okToChange.exec(false);

                     }

                 }

             });

         } else {

             processBeforeShow = true;

         }

     }

     protected void fireUpdateEvent(final Callback<Boolean> okToChange) {

         eventBus.fireEvent(new UpdateEvent(okToChange));

     }

     protected void resetModel() {

         programModel.resetRoot();

     }

     protected void resetFieldInteractionFlag() {

         View currentView = getCurrentView();

         if (currentView instanceof Section) {

             ((Section) currentView).resetFieldInteractionFlags();

         }

     }

     /**

      * Initialized model of the controller.

      */

     private void initializeModel() {

         setDefaultModelId(ProgramConstants.PROGRAM_MODEL_ID);

         registerModel(ProgramConstants.PROGRAM_MODEL_ID, new ModelProvider<DataModel>() {

             @Override

             public void requestModel(final ModelRequestCallback<DataModel> callback) {

                 if (programModel.getRoot() == null || programModel.getRoot().size() == 0) {

                     loadModel(callback);

                 } else {

                     callback.onModelReady(programModel);

                 }

             }

         });

     }

     @Override

     public void requestModel(Class modelType, ModelRequestCallback callback) {

         if (modelType == ReferenceModel.class) {

             ReferenceModel referenceModel = new ReferenceModel();

             referenceModel.setReferenceId(ProgramUtils.getProgramId(programModel));

             referenceModel.setReferenceTypeKey(ProgramConstants.MAJOR_REFERENCE_TYPE_ID);

             referenceModel.setReferenceType(ProgramConstants.MAJOR_LU_TYPE_ID);

             Map<String, String> attributes = new HashMap<String, String>();

             attributes.put("name", getStringProperty("name"));

             referenceModel.setReferenceAttributes(attributes);

             callback.onModelReady(referenceModel);

         } else {

             super.requestModel(modelType, callback);

         }

     }

     /**

      * Loads data model from the server.

      *

      * @param callback we have to invoke this callback when model is loaded or failed.

      */

     protected void loadModel(final ModelRequestCallback<DataModel> callback) {

         programRemoteService.getData(getViewContext().getId(), new AbstractCallback<Data>(ProgramProperties.get().common_retrievingData()) {

             @Override

             public void onFailure(Throwable caught) {

                 super.onFailure(caught);

                 callback.onRequestFail(caught);

             }

             @Override

             public void onSuccess(Data result) {

                 super.onSuccess(result);

                 programModel.setRoot(result);

                 setHeaderTitle();

                 callback.onModelReady(programModel);

             }

         });

     }

     private void setModelData() {

         setHeaderTitle();

         setStatus();

         configurer.applyPermissions();

         //We don't want to throw ModelLoadedEvent when we just want to rollback the model

         if (needToLoadOldModel) {

             needToLoadOldModel = false;

         } else {

             String id = ProgramUtils.getProgramId(programModel);

             if (null != id) {

                 // add to recently viewed

                 ViewContext docContext = new ViewContext();

                 docContext.setId(id);

                 docContext.setIdType(IdType.OBJECT_ID);

                 String pgmType = getStringProperty(ProgramConstants.TYPE);

                 docContext.setAttribute(ProgramConstants.TYPE, pgmType + '/' + ProgramSections.PROGRAM_DETAILS_VIEW);

                 RecentlyViewedHelper.addDocument(getProgramName(),

                         HistoryManager.appendContext(getProgramViewLocation(pgmType), docContext));

             }

             eventBus.fireEvent(new ModelLoadedEvent(programModel));

             onModelLoadedEvent();

         }

     }

     private String getProgramViewLocation(String pgmType) {

         if (ProgramClientConstants.MAJOR_PROGRAM.equals(pgmType)) {

             return AppLocations.Locations.VIEW_PROGRAM.getLocation();

         } else if (ProgramClientConstants.CORE_PROGRAM.equals(pgmType)) {

             return AppLocations.Locations.VIEW_CORE_PROGRAM.getLocation();

         } else if (ProgramClientConstants.CREDENTIAL_PROGRAM_TYPES.contains(pgmType)) {

             return AppLocations.Locations.VIEW_BACC_PROGRAM.getLocation();

         }

         return null;

     }

     protected void setStatus() {

         statusLabel.setText(ProgramProperties.get().common_status(getStringProperty(ProgramConstants.STATE)));

     }

     public String getProgramName() {

         String name = getStringProperty(ProgramConstants.LONG_TITLE);

         if (name == null) {

             name = ProgramProperties.get().common_newProgram();

         }

         return name;

     }

     /**

      * Got invoked by framework before showing the view of the controller.

      *

      * @param onReadyCallback

      */

     @Override

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

         if (programModel.getRoot() == null) {

             loadModel(new ModelRequestCallback<DataModel>() {

                 @Override

                 public void onModelReady(DataModel model) {

                     if (loadMetadataCondition()) {

                         loadMetadata(onReadyCallback);

                     } else {

                         onReadyCallback.exec(true);

                     }

                 }

                 @Override

                 public void onRequestFail(Throwable cause) {

                     GWT.log(cause.getMessage());

                 }

             });

         } else {

             afterMetadataLoaded(onReadyCallback);

         }

     }

     /**

      * We should only load metadata if the status of model is changed.

      *

      * @return

      */

     protected boolean loadMetadataCondition() {

         return lastLoadedStatus == null || ProgramStatus.of(programModel) != lastLoadedStatus;

     }

     /**

      * Loads metadata from the server.

      *

      * @param onReadyCallback

      */

     protected void loadMetadata(final Callback<Boolean> onReadyCallback) {

         Map<String, String> idAttributes = new HashMap<String, String>();

         ViewContext viewContext = getViewContext();

         IdType idType = viewContext.getIdType();

         String viewContextId = null;

         if (idType != null) {

             idAttributes.put(IdAttributes.ID_TYPE, idType.toString());

             viewContextId = viewContext.getId();

             if (idType == IdType.COPY_OF_OBJECT_ID) {

                 viewContextId = null;

             }

         }

         if (programModel.getRoot() != null) {

             ProgramStatus programStatus = ProgramStatus.of(programModel);

             idAttributes.put(DtoConstants.DTO_STATE, programStatus.getValue());

             if (programStatus.getNextStatus() != null) {

                 idAttributes.put(DtoConstants.DTO_NEXT_STATE, programStatus.getNextStatus().getValue());

             }

         }

         programRemoteService.getMetadata(viewContextId, idAttributes, new AbstractCallback<Metadata>() {

             @Override

             public void onSuccess(Metadata result) {

                 super.onSuccess(result);

                 DataModelDefinition def = new DataModelDefinition(result);

                 programModel.setDefinition(def);

                 lastLoadedStatus = ProgramStatus.of(programModel);

                 afterMetadataLoaded(onReadyCallback);

             }

             @Override

             public void onFailure(Throwable caught) {

                 super.onFailure(caught);

                 onReadyCallback.exec(false);

             }

         });

     }

     protected void configureView() {

         addStyleName("programController");

         configurer.setModelDefinition(programModel.getDefinition());

         configurer.configure(this);

         addContentWidget(statusLabel);

         setSideBarWidget(sideBar);

     }

     @Override

     public void setViewContext(ViewContext viewContext) {

         super.setViewContext(viewContext);

         if (viewContext.getId() != null && !viewContext.getId().isEmpty()) {

             viewContext.setPermissionType(PermissionType.OPEN);

         } else {

             viewContext.setPermissionType(PermissionType.INITIATE);

         }

     }

     /**

      * Called when metadata is loaded.

      *

      * @param onReadyCallback

      */

     protected void afterMetadataLoaded(Callback<Boolean> onReadyCallback) {

         if (!reloadMetadata) {

             configureView();

             onReadyCallback.exec(true);

             reloadMetadata = true;

         } else {

             onReadyCallback.exec(true);

             ProgramUtils.syncMetadata(configurer, programModel.getDefinition());

         }

         if (programModel.getRoot() != null) {

             setModelData();

         }

     }

     protected void setHeaderTitle() {

         String title = getProgramName();

         this.setContentTitle(title);

         this.setName(title);

     }

     protected Widget createCommentPanel() {

         final CommentTool commentTool = new CommentTool(ProgramSections.COMMENTS, "Comments", "kuali.comment.type.generalRemarks", "Program Comments");

         commentTool.setController(this);

         KSButton commentsButton = new KSButton(ProgramProperties.get().comments_button(), KSButtonAbstract.ButtonStyle.DEFAULT_ANCHOR, new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 commentTool.show();

             }

         });

         return commentsButton;

     }

     protected void doSave() {

     }

     /**

      * Update the state of the program and all of its statements.

      * <p>

      * This is only called when the state change event fires.

      * <p>

      * There are several types of programs (majorDiscipline, core, credential).  The

      * state of each program changes when buttons are pressed.  For example, pressing

      * the  activate button may change the state of the program from draft to active.

      * <p>

      * This method is triggered when the state changes.  It will pass the 

      * new state to the controller servlet, which will then use it to update the state

      * by calling the web services.

      * <p>

      * Note that state and status are different.

      * <p>

      * It is placed in ProgramController so core, credential, etc all have access it.

      * <p>

      * 

      * 

      * @param programModel a map containing data representing the program

      * @param state the state we changed to

      * @param callback will return true if update succeeded

      */

      protected void updateState(String state, final Callback<Boolean> okCallback) {

                 programRemoteService.updateState(programModel.getRoot(), state,  new AbstractCallback<DataSaveResult>(ProgramProperties.get().common_savingData()) {

                 @Override

                 public void onSuccess(DataSaveResult result) {

                     super.onSuccess(result);

                     okCallback.exec(true);

                     refreshModelAndView(result);

                }

             }); 

      }

      /**

       * This method will refresh the model and view with the data sent back from

       * the server.

       *

       */

      public void refreshModelAndView(DataSaveResult result){

          if (result != null) {

               programModel.setRoot(result.getValue());

          }

          setHeaderTitle();

          setStatus();

      }

     public DataModel getProgramModel() {

         return programModel;

     }

     public void onModelLoadedEvent() {

     }

     protected String getStringProperty(String key) {

         return programModel.get(key);

     }

     protected Data getDataProperty(String key) {

         return programModel.get(key);

     }

     public boolean isExportButtonActive() {

         if (this.getCurrentViewEnum() != null) {

             if (this.getCurrentViewEnum().equals(ProgramSections.SUMMARY) 

                     || this.getCurrentViewEnum().equals(ProgramSections.VIEW_ALL)) {

                 return true;            

             } else {

                 return false;

             }

         } else {

             return false;

         }

     }

     @Override

     public ArrayList<ExportElement> getExportElementsFromView() {

         String viewName = null;

         String sectionTitle = null;

         View currentView = this.getCurrentView();

         if (currentView != null) {

             ArrayList<ExportElement> exportElements = new ArrayList<ExportElement>();

             if (currentView != null && currentView instanceof Section) {

                 Section currentSection = (Section) currentView;

                 List<Section> nestedSections = currentSection.getSections();

                 for (int i = 0; i < nestedSections.size(); i++) {

                     ExportElement sectionExportItem = new ExportElement();

                     ArrayList<ExportElement> subList = null;

                     Section nestedSection = nestedSections.get(i);

                     if (nestedSection != null && nestedSection instanceof SectionView) {

                         SectionView nestedSectionView = (SectionView) nestedSection;

                         viewName =  nestedSectionView.getName();

                         sectionTitle = nestedSectionView.getTitle();

                         sectionExportItem.setSectionName(sectionTitle + " " + i + " - " + viewName);

                         sectionExportItem.setViewName(sectionTitle + " " + i + " - " + viewName);

                         subList = ExportUtils.getExportElementsFromView(nestedSectionView, subList, viewName, sectionTitle);

                         if (subList != null && subList.size()> 0) {

                             sectionExportItem.setSubset(subList);

                             exportElements.add(sectionExportItem);

                         }

                     }                    

                 }

             }

             return exportElements;

         } else {

 //            logger.warn("ExportUtils.getExportElementsFromView controller currentView is null :" + this.getClass().getName());

         }

         return null;

     }

 }