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

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

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

 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.client.security.SecurityContext;

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

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

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

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

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

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

 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.events.ModelLoadedEvent;

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

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

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

 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.dom.client.ClickEvent;

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

 import com.google.gwt.event.logical.shared.ValueChangeEvent;

 import com.google.gwt.event.logical.shared.ValueChangeHandler;

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

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

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

 public class MajorViewController extends MajorController implements RequiresAuthorization{

     // TODO: Change to program and copy msgs

     private static final String MSG_GROUP = "program";

     /**

      * 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.getValuesForMajorDiscipline(false));

     // Used to pass flag if this is the latest version of the program from

     // an async call to the light box so we can conditionally decided

     // to display the use curriculum review process checkbox

     private boolean isCurrentVersion;

     /**

      * Constructor.

      *

      * @param programModel

      */

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

         super(programModel, viewContext, eventBus);

         configurer = GWT.create(MajorViewConfigurer.class);  

         // Initialize handlers and action drop-down

         initHandlers();

      }

     private void initHandlers() {

         /*

          * Action drop-down box on-change

          */

         actionBox.addChangeHandler(new ChangeHandler() {

             @Override

             public void onChange(ChangeEvent event) {

                 // Get the action selected in the drop-down

                 ActionType actionType = ActionType.of(actionBox.getSelectedValue());

                 ViewContext viewContext = getViewContext();

                 // If modify is selected

                 if (actionType == ActionType.MODIFY) {

                     processModifyActionType(viewContext);

                 }

                 // If retire is selected

                 else if (actionType == ActionType.RETIRE) {

                     // TODO: retire is not implemented yet for program

                 }

             }

         });

         /*

          * Initial value selected in action drop-down

          */

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

             @Override

             public void onEvent(ProgramViewEvent event) {

                 actionBox.setSelectedIndex(0);

             }

         });

         /* 

          * Code executed right after model is loaded from service

          */

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

             @Override

             public void onEvent(ModelLoadedEvent event) {

                 /*

                  * Reload values in the drop-down if the data model changes

                  * since we may have loaded a different version

                  */

                 resetActionList();

                 String type = context.getAttributes().get(ProgramConstants.TYPE);

                 if (type != null) {

                     context.getAttributes().remove(ProgramConstants.TYPE);

                     if (type.equals(ProgramConstants.VARIATION_TYPE_KEY)) {

                         showVariationView();

                     } else {

                             //Take out the vairationId if it exists for cleaner navigation

                             context.getAttributes().remove(ProgramConstants.VARIATION_ID);

                         showView(ProgramSections.VIEW_ALL);

                     }

                 } else {

                         context.getAttributes().remove(ProgramConstants.VARIATION_ID);

                     showView(ProgramSections.VIEW_ALL);

                 }

             }

         });

     }

     /**

      * 

      * This method process the modify a program action that was selected. A permission

      * check is done to see if the modify program lightbox shoudl be presented to the

      * user.

      * 

      * The modify programl lightbox is only shown to the admin role.

      * 

      * @param viewContext

      */

     private void processModifyActionType(final ViewContext viewContext) {

             SecurityContext securityContext = Application.getApplicationContext().getSecurityContext(); 

             securityContext.checkPermission("useCurriculumReview", new Callback<Boolean>() {

             @Override

             public void exec(Boolean result) {

                 final boolean isAuthorized = result;

                 // Show the modify program light box only for admin role.

                 if (isAuthorized) {

                     buildModifyDialog(viewContext, "/HOME/CURRICULUM_HOME/COURSE_PROPOSAL", programModel);

                 } else {

                     if (isProgramStatusValidForProposal()) {

                         showModifyProgramWithNewVersionCurriculumReviewView();

                     } else {

                         showModifyProgramWithoutVersionView(viewContext);

                     }

                 }

             }

         });

     }

     /**

      * 

      * This method builds the light box that appears when you choose to modify a program.

      * 

      * @param viewContext

      * @param modifyPath

      * @param model

      */

     private void buildModifyDialog(final ViewContext viewContext, final String modifyPath, final DataModel model){

         final KSLightBox modifyDialog = new KSLightBox();

         //Create a dialog for course selection

         modifyDialog.setTitle((getMessage("modifyProgramSubTitle")));

         final VerticalPanel layout = new VerticalPanel();

         layout.addStyleName("ks-form-module-fields");

         final KSButton continueButton = new KSButton(getMessage("continue"));

         modifyDialog.addButton(continueButton);

         Anchor cancelLink = new Anchor("Cancel");

         // Cancel should just close the dialog

         cancelLink.addClickHandler(new ClickHandler(){

             public void onClick(ClickEvent event) {

                 modifyDialog.hide();

             }

         });

         modifyDialog.addButton(cancelLink);

         //HorizontalPanel titlePanel = new HorizontalPanel();

         KSLabel titleLabel = new KSLabel(getMessage("modifyProgramSubTitle"));

         titleLabel.addStyleName("bold");

         modifyDialog.setNonCaptionHeader(titleLabel);

         //titlePanel.add(titleLabel);

         //layout.add(titlePanel);

         final KSRadioButton radioOptionModifyNoVersion = new KSRadioButton("modifyCreditProgramButtonGroup", getMessage("modifyProgramNoVersion"));

         final KSRadioButton radioOptionModifyWithVersion = new KSRadioButton("modifyCreditProgramButtonGroup", getMessage("modifyProgramWithVersion"));

         final KSCheckBox curriculumReviewOption = new KSCheckBox(getMessage("useCurriculumReview"));

         radioOptionModifyNoVersion.addValueChangeHandler(new ValueChangeHandler<Boolean>(){

             public void onValueChange(ValueChangeEvent<Boolean> event) {

                 if(event.getValue()){

                     curriculumReviewOption.setEnabled(false);

                     curriculumReviewOption.setValue(false);

                 }

             }

         });

         radioOptionModifyNoVersion.setValue(true);

         curriculumReviewOption.setEnabled(false);

         radioOptionModifyWithVersion.addValueChangeHandler(new ValueChangeHandler<Boolean>(){

             public void onValueChange(ValueChangeEvent<Boolean> event) {

                 if(event.getValue()){

                     curriculumReviewOption.setEnabled(true);

                 }

             }

         });

         /*

          * Continue button clicked.

          */

         continueButton.addClickHandler(new ClickHandler(){

             @Override

             public void onClick(ClickEvent event) {

                  if (radioOptionModifyNoVersion.getValue()){

                     // If modify w/out version radio button is chosen 

                     // we just edit the program.  We do not create a copy.

                     // We navigate to the edit program controller

                      showModifyProgramWithoutVersionView(viewContext);

                  } else if (radioOptionModifyWithVersion.getValue() && curriculumReviewOption.getValue()){

                     // If the curriculum review option IS checked and the modify with version radio button IS selected

                     // We need to create a copy of the program (by passing in COPY_OF_OBJECT_ID)

                     // and then transfer control to the proposal controller (the proposal controller has

                     // extra section for entering proposal related data

                     showModifyProgramWithNewVersionCurriculumReviewView();

                  } else if (radioOptionModifyWithVersion.getValue()){

                     // If we are just choosing to modify a program but want to create a new version

                     // AND we are not using the proposal process

                     // We make a copy of the data model and transfer control

                     // to the edit program screen

                      // Pass the ID and the type to the proposal controller

                      // using the view context.  We then read it in the

                      // setViewContext method and use it to initialize the

                      // work flow utilities

                      String versionIndId = getStringProperty(ProgramConstants.VERSION_IND_ID);

                      viewContext.setId(versionIndId);

                      viewContext.setIdType(IdType.COPY_OF_OBJECT_ID);

                      //ProgramRegistry.setSection(ProgramSections.getEditSection(getCurrentViewEnum()));

                      HistoryManager.navigate(AppLocations.Locations.EDIT_PROGRAM.getLocation(), viewContext);

                 }   

                 // Hide dialog after clicking

                 modifyDialog.hide();

             }           

         });

         //Check that this is the latest version with an async call and only show modify with version options if it is the latest

         layout.add(radioOptionModifyNoVersion);

         // the curriculum review check box implements "modify by proposal"

         // a user can only check the box when the program state is active, retired, or approved (it must be the latest version when in these states)

         // See https://wiki.kuali.org/display/KULSTG/Course%2C+Proposal%2C+and+Program+Action+Dropdown+Items

         if (isProgramStatusValidForProposal()) {

             layout.add(radioOptionModifyWithVersion);

             layout.add(curriculumReviewOption);

         }

         modifyDialog.setWidget(layout);

         modifyDialog.show();

     } 

     /**

      * 

      * This method checks if the program state is active, retired, or approved (it must be

      * the latest version when in these states)

      * 

      * @return

      */

     private boolean isProgramStatusValidForProposal() {

         ProgramStatus status = ProgramStatus.of(programModel);

         if (isCurrentVersion

                 && (status == ProgramStatus.ACTIVE || status == ProgramStatus.APPROVED || status == ProgramStatus.ACTIVE)) {

             return true;

         }

         return false;

     }

     /**

      * 

      * This method will grab a message based on a key.

      * 

      * @param courseMessageKey

      * @return

      */

     public String getMessage(String programMessageKey) {

         String msg = Application.getApplicationContext().getMessage(MSG_GROUP, programMessageKey);

         if (msg == null) {

             msg = programMessageKey;

         }

         return msg;

     }   

     /**

      * 

      * This method will set the values in the action list drop-down.

      *

      */

     protected void resetActionList() {

         // Get the current state of the program (SUPERSEDED, ACTIVE, APPROVED, DRAFT)

             ProgramStatus status = ProgramStatus.of(programModel);

             // Get the version independent indicator

         String versionIndId = getStringProperty(ProgramConstants.VERSION_IND_ID);

         // The the version sequence number

         Long sequenceNumber = programModel.get(ProgramConstants.VERSION_SEQUENCE_NUMBER);

         // Clear the drop-down list and prepare to populate it with values

         actionBox.clear();

         // Call the server to see if this is the latest version of the program

         // and update the drop-down accordingly

             programRemoteService.isLatestVersion(versionIndId, sequenceNumber, new KSAsyncCallback<Boolean>(){

                         public void onSuccess(Boolean isLatest) {

                             // TODO PLEASE REVIEW.  Should we be passing values from async calls to light boxes

                             // using instance variables like this? (we are doing this in course as well)

                             isCurrentVersion = isLatest;

                             // Populate the action box drop-down with different values depending 

                             // on if we are working with the latest version of the program 

                             // or a historical version

                 actionBox.setList(ActionType.getValuesForMajorDiscipline(isLatest));

                 if (!isCurrentVersion) {

                     Application.getApplicationContext().getSecurityContext().checkPermission("useCurriculumReview", new Callback<Boolean>() {

                         @Override

                         public void exec(Boolean result) {

                             final boolean isAuthorized = result;

                             if (!isAuthorized) {

                                 actionBox.removeItem(ActionType.MODIFY.getValue());

                             }

                         }

                     });

                 }

                          }                

         });

             // Get the reference ID of the proposal from the XML model

             // Note: the filter puts in in the model, see ProposalWorkflowFilter.applyOutboundDataFilter

             String referenceId = programModel.getRoot().get("id");

             // When the program being viewed is in DRAFT state, check to see if it exists as part of program proposal instead of admin modify. 

             // If its part of a program proposal then we don't want to display the program actions drop down since user is not allowed to take

             // any actions on a DRAFT program proposal outside of proposal process.

             // TODO PLEASE REVIEW.  If this async call runs slow, will the box remain visible? Is this an issue?

             //      Answer: Yes, it might be an issue, possible solution might to block user action w/progress bar until finished.            

         if (status == ProgramStatus.DRAFT){

                     programRemoteService.isProposal( "kuali.proposal.referenceType.clu", referenceId,  new KSAsyncCallback<Boolean>(){

                     public void onSuccess(Boolean isProposal) {

                         // If this is a proposal then we cannot take any actions on it

                         // So hide the action box

                         if (isProposal){

                             actionBox.setVisible(false);

                         }

                     }           

                 });

         }

     } 

     private void showVariationView() {

         String variationId = context.getAttributes().get(ProgramConstants.VARIATION_ID);

         if (variationId != null) {

             final Data variationMap = getDataProperty(ProgramConstants.VARIATIONS);

             if (variationMap != null) {

                 int row = 0;

                 for (Property p : variationMap) {

                     final Data variationData = p.getValue();

                     if (variationData != null) {

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

                             //FIXME: Find a better way to do this.

                             // We shouldn't be maintaining two separate datamodels for progs and variations

                             Data credData = getDataProperty(ProgramConstants.CREDENTIAL_PROGRAM);

                             variationData.set(ProgramConstants.CREDENTIAL_PROGRAM, credData);

                             ProgramRegistry.setData(variationData);

                             ProgramRegistry.setRow(row);

                         }

                         row++;

                     }

                 }

                 HistoryManager.navigate(AppLocations.Locations.VIEW_VARIATION.getLocation(), context);

             }

         }

     }

     @Override

     protected void configureView() {

         super.configureView();

         addContentWidget(actionBox);

         initialized = true;

     }

     /**

      * 

      * This method navigates to the edit program controller.

      * 

      * @param viewContext

      */

     private void showModifyProgramWithoutVersionView(final ViewContext viewContext) {

         ProgramRegistry.setSection(ProgramSections.getEditSection(getCurrentViewEnum()));

          HistoryManager.navigate(AppLocations.Locations.EDIT_PROGRAM.getLocation(), viewContext);

     }

     /**

      * 

      * This method transfers control to the proposal controller.

      * 

      */

     private void showModifyProgramWithNewVersionCurriculumReviewView() {

         String versionIndId = getStringProperty(ProgramConstants.VERSION_IND_ID);

         // Pass the ID and the type to the proposal controller

         // using the view context.  We then read it in the

         // setViewContext method and use it to initialize the

         // work flow utilities

         final ViewContext viewContext = new ViewContext();

         viewContext.setId(versionIndId);

         viewContext.setIdType(IdAttributes.IdType.COPY_OF_OBJECT_ID); 

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

     }

     @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_FIND_PROGRAM_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_FIND_PROGRAM_SCREEN);

                         }        

                 });

         }

 }