package org.kuali.student.lum.lu.ui.course.client.controllers;

 import java.util.ArrayList;

 import java.util.List;

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

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

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

 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.configurable.mvc.FieldDescriptor;

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

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

 import org.kuali.student.common.ui.client.event.ActionEvent;

 import org.kuali.student.common.ui.client.event.SaveActionEvent;

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

 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.ModelRequestCallback;

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

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

 import org.kuali.student.common.ui.client.widgets.menus.KSMenuItemData;

 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.ui.shared.IdAttributes.IdType;

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

 import org.kuali.student.core.workflow.ui.client.widgets.WorkflowUtilities;

 import org.kuali.student.lum.common.client.lu.LUUIConstants;

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

 import org.kuali.student.lum.lu.LUConstants;

 import org.kuali.student.lum.lu.assembly.data.client.constants.orch.CreditCourseConstants;

 import org.kuali.student.lum.lu.ui.course.client.configuration.CourseAdminConfigurer;

 import org.kuali.student.lum.lu.ui.course.client.configuration.CourseProposalConfigurer;

 import org.kuali.student.lum.lu.ui.course.client.configuration.CourseProposalConfigurer.CourseSections;

 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.user.client.DOM;

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

 /**

  * Controller for create/modify course with proposal wrapper admin screens. This controller uses a different

  * configurer for admin screens and attempts to reuse as much of the validation, save & retreive logic coded

  * in the CourseProposalController.  Also it reuses the menu from CourseProposalController and adds click

  * handlers to button menu to navigate user b/w sections of the same view.

  * 

  * @author Will

  *

  */

 public class CourseAdminController extends CourseProposalController{

         //Need to keep track of cancel buttons, so they can be enabled when course has been saved. 

         List<KSButton> cancelButtons = new ArrayList<KSButton>();

         /**

          * Override the intitailzeController method to use CourseAdminConfigurer 

          */

         @Override

         protected void initializeController() {

                 super.cfg = GWT.create(CourseAdminConfigurer.class);

                 super.proposalPath = cfg.getProposalPath();

                    super.workflowUtil = new WorkflowUtilities(CourseAdminController.this ,proposalPath);

                    cfg.setState(DtoConstants.STATE_DRAFT.toUpperCase());

                    cfg.setNextState(DtoConstants.STATE_APPROVED.toUpperCase());

                    super.setDefaultModelId(cfg.getModelId());

                    super.registerModelsAndHandlers();

                    super.addStyleName("ks-course-admin");

                    currentDocType = LUConstants.PROPOSAL_TYPE_COURSE_CREATE_ADMIN;                           

     }

         /**

          * Override the getSaveButton to provide a new set of buttons for the admin screens

          */

         @Override

         public KSButton getSaveButton(){

                 KSButton saveButton = new KSButton("Save", new ClickHandler(){

             public void onClick(ClickEvent event) {

                     handleButtonClick(DtoConstants.STATE_DRAFT);                    

             }

         });                

                 saveButton.addStyleName("ks-button-spacing");

                 return saveButton;

         }

         public KSButton getApproveAndActivateButton(){

                 return new KSButton("Approve and Activate", new ClickHandler(){

             public void onClick(ClickEvent event) {

                     handleButtonClick(DtoConstants.STATE_ACTIVE);

             }

         });                

         }

         public KSButton getCancelButton(){

                 KSButton cancelButton = new KSButton("Cancel Proposal", new ClickHandler(){

             public void onClick(ClickEvent event) {

                 if (isNew) {

                     Application.navigate(AppLocations.Locations.CURRICULUM_MANAGEMENT.getLocation());

                 } else {

                     //Cancel the proposal and navigate the user back to curriculum home if cancel was successful.

                     workflowUtil.cancel(new Callback<Boolean>() {

                         @Override

                         public void exec(Boolean result) {

                             if (result) {

                                 Application.navigate(AppLocations.Locations.CURRICULUM_MANAGEMENT.getLocation());

                             }

                         }

                     });

                 }

             }

         });

                 cancelButton.addStyleName("ks-button-spacing");

                 cancelButtons.add(cancelButton);

                 return cancelButton;

     }

         /**

          * Processes the save, approve, or approve and activate button clicks. The action is determined

          * by the value of the state parameter.

          * 

          * @param state The state to set on the course when saving course data. DRAFT=Save, APPROVED=Approve, and

          * ACTIVE=Approve & Activate

          */

         protected void handleButtonClick(final String state){

             //Set state on course before performing save action

                 cluProposalModel.set(QueryPath.parse(CreditCourseConstants.STATE), state);

             final SaveActionEvent saveActionEvent = getSaveActionEvent(state);

             //Store the rules if save was called

             if((String)cluProposalModel.get(CreditCourseConstants.ID)!=null && cfg instanceof CourseAdminConfigurer){

                     ((CourseAdminConfigurer )cfg).getRequisitesSection().storeRules(new Callback<Boolean>(){

                             public void exec(Boolean result) {

                                         if(result){

                                                 doAdminSaveAction(saveActionEvent, state);

                                         }else{

                                                 KSNotifier.show("Error saving rules.");

                                         }

                                 }

                     });

             }else{

             doAdminSaveAction(saveActionEvent, state);                    

             }

         }

         /**

          * Returns a SaveActionEvent with the appropriate ActionCompleteCallback, which will take additional admin actions once

          * save is complete. The action (i.e. button clicked) is determined by the value of the state parameter 

          * 

          * @param state The state to set on the course when saving course data. DRAFT=Save, ACTIVE=Approve & Activate

          * @return the save event that will be fired based on the button click

          */

         private SaveActionEvent getSaveActionEvent(final String state){

             final SaveActionEvent saveActionEvent = new SaveActionEvent(false);

                 if (DtoConstants.STATE_ACTIVE.equalsIgnoreCase(state)){

                     saveActionEvent.setActionCompleteCallback(new ActionCompleteCallback(){

                                 @Override

                                 public void onActionComplete(ActionEvent actionEvent) {

                                         if (saveActionEvent.isSaveSuccessful()){

                                                 workflowUtil.blanketApprove(new Callback<Boolean>(){

                                                         @Override

                                                         public void exec(Boolean result) {

                                                                 final ViewContext viewContext = new ViewContext();

                                                 viewContext.setId((String)cluProposalModel.get(CreditCourseConstants.ID));

                                                 viewContext.setIdType(IdType.OBJECT_ID);                                                                                                                        

                                                                 if (DtoConstants.STATE_ACTIVE.equalsIgnoreCase(state)){

                                                                         KSNotifier.show("Course approved and activated. It may take a minute or two for course status to be updated. Refresh to see latest status.");

                                                                         Application.navigate(AppLocations.Locations.VIEW_COURSE.getLocation(), viewContext);

                                                                 }

                                                         }

                                                 });

                                         }      

                                 }

                     });

             } else {

                     //User clicked Save button. When user clicks save, both document upload and cancel should be enabled

                     saveActionEvent.setActionCompleteCallback(new ActionCompleteCallback(){

                                 @Override

                                 public void onActionComplete(ActionEvent action) {

                                         for (KSButton cancelButton:cancelButtons){

                                                 cancelButton.setEnabled(true);

                                                 ((CourseAdminConfigurer )cfg).getDocumentTool().beforeShow(NO_OP_CALLBACK);

                                         }                                        

                                 }                            

                     });

             }

                 return saveActionEvent;

         }

         /**

          * Fires the SaveActionEvent to be handled by the {@link CourseProposalController}. 

          * 

          *  @see CourseProposalController#registerModelsAndHandlers()

          *  @param saveActionEvent SaveActionEvent to fire

          *  @param state The state to set on the course when saving course data. DRAFT=Save, APPROVED=Approve, and

          *  ACTIVE=Approve & Activate

          */

         private void doAdminSaveAction(final SaveActionEvent saveActionEvent, String state){

                 if (DtoConstants.STATE_APPROVED.equalsIgnoreCase(state) || DtoConstants.STATE_ACTIVE.equalsIgnoreCase(state)){

                         //For Approved action, validate required fields for next (i.e.Approved) state before firing the save action

                         cluProposalModel.validateNextState((new Callback<List<ValidationResultInfo>>() {

                     @Override

                     public void exec(List<ValidationResultInfo> result) {

                             boolean isSectionValid = isValid(result, true);

                             if(isSectionValid){

                                     CourseAdminController.this.fireApplicationEvent(saveActionEvent);                    }

                             else{

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

                             }

                     }

                 }));

                 } else {

                     CourseAdminController.this.fireApplicationEvent(saveActionEvent);                        

                 }                 

         }

         /**

          * 

          * Override {@link CourseProposalController} because end term should always be editable 

          * in admin screens.

          */

     protected void progressiveEnableFields() {

         super.progressiveEnableFields();

     }

         /**

      * Override the setHeaderTitle to display proper header title for admin screens

      */

         @Override

         protected void setHeaderTitle(){

             String title;

             if (cluProposalModel.get(cfg.getProposalTitlePath()) != null){

                     title = getProposalTitle();

             }

             else{

                     title = "New Course (Admin Proposal)";

             }

             this.setContentTitle(title);

             this.setName(title);

             WindowTitleUtils.setContextTitle(title);

                 currentTitle = title;

     }

         private String getProposalTitle(){

                 StringBuffer sb = new StringBuffer();

                 sb.append(cluProposalModel.get(cfg.getProposalTitlePath()));

                 sb.append(" (Admin Proposal)");

                 return sb.toString();

         }

         /**

          * This is a special method for CourseAdminController, which adds a menu item to the navigation menu and navigates

          * a user to a section within the view rather than a different view.

          * 

          * @param parentMenu

          * @param sectionName

          * @param sectionId

          * @param section

          */

     public void addMenuItemSection(String parentMenu, final String sectionName, final String widgetId, final Widget widget) {            

         KSMenuItemData parentItem = null;

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

             if (topLevelMenuItems.get(i).getLabel().equals(parentMenu)) {

                 parentItem = topLevelMenuItems.get(i);

                 break;

             }

         }

         KSMenuItemData item = new KSMenuItemData(sectionName);

             widget.getElement().setId(widgetId);

             item.setClickHandler(new ClickHandler(){

                         public void onClick(ClickEvent event) {                

                                 //FIXME: This doesn't scroll to exactly the position stuff

                                 DOM.getElementById(widgetId).scrollIntoView();

                         }                    

             });

         if (parentItem != null) {

             parentItem.addSubItem(item);

         } else {

             topLevelMenuItems.add(item);

         }

         menu.refresh();

     }

         @Override

         protected void configureScreens(DataModelDefinition modelDefinition, final Callback<Boolean> onReadyCallback) {

                 super.configureScreens(modelDefinition, previousEndTermConfigurationCallback(onReadyCallback));

         }

         /**

          * This callback is used to configure the previous end term field after the screens have been configured.

          * 

          * @param onReadyCallback

          * @return

          */

         protected Callback<Boolean> previousEndTermConfigurationCallback(final Callback<Boolean> onReadyCallback){

                 return new Callback<Boolean>(){

                         @Override

                         public void exec(final Boolean result) {

                                 requestModel(new ModelRequestCallback<DataModel>(){

                                         @Override

                                         public void onModelReady(DataModel model) {

                                                 //In admin screens add the previous end term field to the active dates section and update it's values   

                                                 //ONLY when in edit mode. This way it doesn't attempt to retrieve non-existent "Course Info" section;

                                                 //only the "Summary" section has been configured in non-edit mode.

                                                 if (model.getDefinition().getMetadata().isCanEdit()){

                                                         String versionedFromId = model.get("versionInfo/versionedFromId");

                                                         if(versionedFromId!=null && !versionedFromId.isEmpty()){

                                                                 //Add the required field 

                                                                 //See why the required for next state is not set

                                                                 VerticalSectionView view = (VerticalSectionView) viewMap.get(CourseSections.COURSE_INFO);                                                        

                                                                 Section activeDatesSection = view.getSection(LUUIConstants.ACTIVE_DATES_LABEL_KEY);

                                                                 Metadata meta = cfg.getModelDefinition().getMetadata(CourseProposalConfigurer.PROPOSAL_PATH + "/" + CreditCourseConstants.PREV_END_TERM);

                                                                 if(meta!=null&&meta.getConstraints().get(0)!=null){

                                                                         meta.getConstraints().get(0).setRequiredForNextState(true);

                                                                         meta.getConstraints().get(0).setNextState("ACTIVE");

                                                                 }

                                                                 FieldDescriptor fd = cfg.addField(activeDatesSection, CourseProposalConfigurer.PROPOSAL_PATH + "/" + CreditCourseConstants.PREV_END_TERM, cfg.generateMessageInfo(LUUIConstants.PROPOSAL_PREV_END_TERM));

                                                                 //FIXME: This static method should not live in WorkflowUtilities

                                                                 WorkflowUtilities.updateCrossField(fd, model);

                                                         }

                                                 }

                                                 onReadyCallback.exec(result);

                                         }

                                         @Override

                                         public void onRequestFail(Throwable cause) {

                                                 throw new RuntimeException("Error getting model",cause);

                                         }

                                 });

                         }

                 };

         }

 }