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

 import java.util.ArrayList;

 import java.util.List;

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

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

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

 import org.kuali.student.common.rice.StudentIdentityConstants;

 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.configurable.mvc.SectionTitle;

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

 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.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.client.widgets.StylishDropDown;

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

 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.client.widgets.progress.BlockingTask;

 import org.kuali.student.common.ui.client.widgets.progress.KSBlockingProgressIndicator;

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

 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.service.CourseRpcService;

 import org.kuali.student.lum.lu.ui.course.client.service.CourseRpcServiceAsync;

 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.logical.shared.ValueChangeEvent;

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

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

 import com.google.gwt.user.client.rpc.AsyncCallback;

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

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

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

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

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

 public class CourseWorkflowActionList extends StylishDropDown {

     private static final String MSG_GROUP = "course";

         private static final BlockingTask processingTask = new BlockingTask("Processing State Change....");

         private static final CourseRpcServiceAsync courseServiceAsync = GWT.create(CourseRpcService.class);    

     private KSMenuItemData modifyCourseActionItem;

         private KSMenuItemData activateCourseActionItem;

         private KSMenuItemData inactivateCourseActionItem;

         private KSMenuItemData retireCourseActionItem;

         private KSMenuItemData copyCourseActionItem;

         private final KSLightBox activateDialog = new KSLightBox();

         private VerticalSection activateSection = new VerticalSection();

     private boolean isCurrentVersion;

     private Boolean isInitialized = false;

     private String courseId;

     private boolean hasAdminAccess = false;

     // Storing this list at multiple layers: here and in StylishDropDown.menu.items.  We need it here to test for empty

     private final List<KSMenuItemData> items = new ArrayList<KSMenuItemData>();

     public CourseWorkflowActionList(String label) {

             super(label);

             this.setVisible(false);

         this.addStyleName("KS-Workflow-DropDown");

     }

         public CourseWorkflowActionList(String label, final ViewContext viewContext, final String modifyPath, DataModel model, final Callback<String> stateChangeCallback) {

             super(label);

             this.setVisible(false);

         this.addStyleName("KS-Workflow-DropDown");

         init(viewContext, modifyPath, model, stateChangeCallback);

         }

         public void init (final ViewContext viewContext, final String modifyPath, final DataModel model, final Callback<String> stateChangeCallback) {

                 if (!this.isInitialized) {

                     buildActivateDialog(stateChangeCallback);

                     this.isCurrentVersion = true;

                     // TODO: use messages

                    modifyCourseActionItem = new KSMenuItemData(this.getMessage("cluModifyItem"), new ClickHandler(){

                                 @Override

                                 public void onClick(ClickEvent event) {

                                         setupModifyCourseDialog(viewContext, modifyPath, model);

                                 }

                         });

                     copyCourseActionItem = new KSMenuItemData(this.getMessage("cluCopyItem"), new ClickHandler(){

                                 @Override

                                 public void onClick(ClickEvent event) {

                                     if(hasCourseId(viewContext)){

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

                                                 viewContext.setIdType(IdType.COPY_OF_OBJECT_ID);

                                                 viewContext.getAttributes().remove(StudentIdentityConstants.DOCUMENT_TYPE_NAME);

                                 }

                                         HistoryManager.navigate(modifyPath, viewContext);

                                 }

                         });

                     activateCourseActionItem = new KSMenuItemData(this.getMessage("cluActivateItem"), new ClickHandler(){

                                 @Override

                                 public void onClick(ClickEvent event) {

                                         showStateDialog(DtoConstants.STATE_ACTIVE);

                                 }

                         });

                     inactivateCourseActionItem = new KSMenuItemData(this.getMessage("cluInactivateItem") + " (Not Yet Implemented)", new ClickHandler(){

                                 @Override

                                 public void onClick(ClickEvent event) {

                                                 // TODO: Inactivate

                                 }

                         });

                     retireCourseActionItem = new KSMenuItemData(this.getMessage("cluRetireItem"), new ClickHandler(){

                                 @Override

                                 public void onClick(ClickEvent event) {

                                     if(hasCourseId(viewContext)){

                                                 viewContext.setId(courseId);

                                                 viewContext.setIdType(IdType.OBJECT_ID);

                                 }

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

                                 }

                         });

                 }

                 this.isInitialized = true;

     }

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

             if(hasCourseId(viewContext)){

                         viewContext.setId(getCourseVersionIndId(model));

                         viewContext.setIdType(IdType.COPY_OF_OBJECT_ID);

             viewContext.setAttribute(StudentIdentityConstants.DOCUMENT_TYPE_NAME, LUConstants.PROPOSAL_TYPE_COURSE_MODIFY);

         }

                 HistoryManager.navigate(modifyPath, viewContext);

     }

         private void showStateDialog(String newState) {

             if (newState.equals(DtoConstants.STATE_RETIRED)) {

                     // TODO: create Retire dialog

             } else if (newState.equals(DtoConstants.STATE_ACTIVE)) {                     

                     // TODO: use message e.g. activateCurrentInstr, activateModificationInstr                    

                     activateSection.setInstructions(getInstructions(newState));                                    

                 activateDialog.show();

             } else if (newState.equals(DtoConstants.STATE_SUSPENDED)) {

                     // TODO: create Inactivate dialog

             }

     }

     private String getInstructions(String newState) {            

             if (isCurrentVersion){

                     // TODO: message

                     return "Activating this course makes it viewable and available for scheduling.";

             } else { 

                     // TODO: message

                     return "Activate this course makes it viewable and available for scheduling. The previous version will be inactivated, and available for reference in the version history.";

             }

     }

     private void buildActivateDialog(final Callback<String> stateChangeCallback){

             FlowPanel panel = new FlowPanel();

             activateDialog.setMaxHeight(200);

             activateDialog.setMaxWidth(200);

             // TODO: use messages

             activateSection = new VerticalSection(SectionTitle.generateH2Title("Activate Course"));

         panel.add((Widget)activateSection);

             KSButton activate = new KSButton("Activate",new ClickHandler(){

             public void onClick(ClickEvent event) {

                 //activateSection.updateModel(cluModel);

                 //set previous active to superseded

                 //set this version to active

                 setCourseState(courseId, DtoConstants.STATE_ACTIVE, stateChangeCallback);

                 activateDialog.hide();                

             }

             });

             activateDialog.addButton(activate);

             KSButton cancel = new KSButton("Cancel", ButtonStyle.ANCHOR_LARGE_CENTERED, new ClickHandler(){

             public void onClick(ClickEvent event) {

                 activateDialog.hide();

             }

             });

             activateDialog.addButton(cancel);

             activateDialog.setWidget(panel);

     }

     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("modifyCourse")));

         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");

         cancelLink.addClickHandler(new ClickHandler(){

                         public void onClick(ClickEvent event) {

                                 modifyDialog.hide();

                         }

         });

         modifyDialog.addButton(cancelLink);

         HorizontalPanel titlePanel = new HorizontalPanel();

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

         titleLabel.addStyleName("bold");

         titlePanel.add(titleLabel);

         layout.add(titlePanel);

         final KSRadioButton radioOptionModifyNoVersion = new KSRadioButton("modifyCreditCourseButtonGroup", getMessage("modifyCourseNoVersion"));

         final KSRadioButton radioOptionModifyWithVersion = new KSRadioButton("modifyCreditCourseButtonGroup", getMessage("modifyCourseWithVersion"));

         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);

                                 }

                         }

         });

         continueButton.addClickHandler(new ClickHandler(){

                         @Override

                         public void onClick(ClickEvent event) {

                                 if (radioOptionModifyNoVersion.getValue()){

                                         viewContext.setId(courseId);

                                         viewContext.setIdType(IdType.OBJECT_ID);

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

                                 } else if (radioOptionModifyWithVersion.getValue()){

                                     checkLatestVersion(viewContext, modifyPath, model, curriculumReviewOption.getValue());                            

                                 }

                             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);

         if(isCurrentVersion){

                 layout.add(radioOptionModifyWithVersion);

             layout.add(curriculumReviewOption);

         }

         modifyDialog.setWidget(layout);

         modifyDialog.show();

     }

     /**

      * Do a latest version check, if successful, call the modify action else display an error message that the current

      * version of the selected course is under modification. 

      * 

      * @param viewContext

      * @param modifyPath

      * @param model

      * @param reviewOption

      */

     private void checkLatestVersion(final ViewContext viewContext, final String modifyPath, final DataModel model, final boolean reviewOption){

         String courseVerIndId = getCourseVersionIndId(model);

         Long courseVersionSequence = getCourseVersionSequenceNumber(model);

         courseServiceAsync.isLatestVersion(courseVerIndId, courseVersionSequence, new AsyncCallback<Boolean>(){

             public void onFailure(Throwable caught) {

                 KSNotifier.add(new KSNotification("Error determining latest version of course", false, 5000));

             }

             public void onSuccess(Boolean result) {

                 if (result){

                     if (reviewOption){

                         doModifyActionItem(viewContext, modifyPath, model);

                     } else {

                         if(hasCourseId(viewContext)){

                             viewContext.setId(getCourseVersionIndId(model));

                             viewContext.setIdType(IdType.COPY_OF_OBJECT_ID);

                             // FIXME: This needs to use a new workflow document type for admin modify with version

                             viewContext.setAttribute(StudentIdentityConstants.DOCUMENT_TYPE_NAME, LUConstants.PROPOSAL_TYPE_COURSE_MODIFY_ADMIN);

                         }

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

                     }

                 } else {

                     isCurrentVersion = false;

                     doUpdateCourseActionItems(model);

                     KSNotifier.add(new KSNotification("Error creating new version for course, this course is currently under modification.", false, 5000));

                 }

             }

         });

     }

     // TODO: add Retire and Inactivate Dialogs

         /**

          * Use this method to call the {@link CourseRpcServiceAsync#changeState(String, String, com.google.gwt.user.client.rpc.AsyncCallback)

          * method, which will handle all related change state operations required for the course depending on the state being set.  

          *  

          * @param courseId

          * @param newState

          * @param stateChangeCallback The callback to execute to indicate if the state change call was successful.

          */

     public static void setCourseState(final String courseId, final String newState, final Callback<String> stateChangeCallback) {

             KSBlockingProgressIndicator.addTask(processingTask);

             courseServiceAsync.changeState(courseId, newState, new KSAsyncCallback<StatusInfo>() {

                     @Override

                  public void handleFailure(Throwable caught) {

                      Window.alert("Error Updating State: "+caught.getMessage());

                      KSBlockingProgressIndicator.removeTask(processingTask);

                      stateChangeCallback.exec(null);

                  }

                  @Override

                  public void onSuccess(StatusInfo result) {                         

                          KSBlockingProgressIndicator.removeTask(processingTask);

                          if (!result.getSuccess()){

                                  stateChangeCallback.exec(null);

                          } else {

                                  stateChangeCallback.exec(newState);

                          }

                  }

             });

     }

         /**

          *  This depends heavily on {@link CourseStateUtil#setCourseState(String, String, Callback)}. 

          *  Changes here will affect assumptions made there.

           *

          */

     public void updateCourseActionItems(final DataModel cluModel) {

                 //First we need the model

                 String courseVerIndId = getCourseVersionIndId(cluModel);

                 Long courseVersionSequence = getCourseVersionSequenceNumber(cluModel);

                 //Do an async check if this is the current version

                 if(courseVerIndId==null){

                         isCurrentVersion = true;

                         doUpdateCourseActionItems(cluModel);

                 }else{

                         courseServiceAsync.isLatestVersion(courseVerIndId, courseVersionSequence, new AsyncCallback<Boolean>(){

                                 public void onFailure(Throwable caught) {

                                         KSNotifier.add(new KSNotification("Error determining latest version of course", false, 5000));

                                 }

                                 public void onSuccess(Boolean result) {

                                         isCurrentVersion = result;

                                         doUpdateCourseActionItems(cluModel);

                                 }

                         });

                 }

     }

         private void doUpdateCourseActionItems(DataModel cluModel) {

             final String cluState = cluModel.get("state");

             courseId = cluModel.get(CreditCourseConstants.ID);

             items.clear();      

                 Application.getApplicationContext().getSecurityContext().checkScreenPermission("cluModifyItem",

                                 new Callback<Boolean>() {

                                         @Override

                                         public void exec(Boolean result) {

                                                 if (!result){

                                                     setItems(getNonAdminItems(cluState));

                                                 } else {

                                                     setItems(getAdminItems(cluState));

                                                 }

                                             CourseWorkflowActionList.this.setEnabled(true);

                                                 if(CourseWorkflowActionList.this.isEmpty()) {

                                                         CourseWorkflowActionList.this.setVisible(false);

                                                 }

                                                 else{

                                                         CourseWorkflowActionList.this.setVisible(true);

                                                 }

                                         }

                                 });                

         }

         private List<KSMenuItemData> getNonAdminItems(String cluState){

             if (cluState.equals(DtoConstants.STATE_APPROVED)) {

             items.add(modifyCourseActionItem);

             items.add(activateCourseActionItem);

         } else if (cluState.equals(DtoConstants.STATE_ACTIVE)) {

             items.add(modifyCourseActionItem);

 //            items.add(inactivateCourseActionItem);

         } else if (cluState.equals(DtoConstants.STATE_SUSPENDED)) {

             items.add(activateCourseActionItem);

         } else if (cluState.equals(DtoConstants.STATE_RETIRED)){

             items.add(modifyCourseActionItem);          

         }

         items.add(copyCourseActionItem);

         if (!isCurrentVersion) {

             items.remove(modifyCourseActionItem);

         }

         return items;

     }

         private List<KSMenuItemData> getAdminItems(String cluState){

             if (cluState.equals(DtoConstants.STATE_APPROVED)) {

             items.add(modifyCourseActionItem);

             items.add(activateCourseActionItem);

             if (isCurrentVersion){

                 items.add(retireCourseActionItem);

             }

         } else if (cluState.equals(DtoConstants.STATE_ACTIVE)) {

             items.add(modifyCourseActionItem);

 //            items.add(inactivateCourseActionItem);

             items.add(retireCourseActionItem);

         } else if (cluState.equals(DtoConstants.STATE_SUSPENDED)) {

             items.add(activateCourseActionItem);

         } else if (cluState.equals(DtoConstants.STATE_RETIRED)){

             items.add(modifyCourseActionItem);          

         } else if(cluState.equals(DtoConstants.STATE_SUPERSEDED)) {

             items.add(modifyCourseActionItem);

         }

             items.add(copyCourseActionItem);

             return items;

         }

     public boolean isEmpty() {

             return (items.size() == 0);

     }

     public String getMessage(String courseMessageKey) {

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

             if (msg == null) {

                     msg = courseMessageKey;

             }

             return msg;

     }

     /** 

      * This checks the ViewContext passed in to determine if it contains a non-empty courseId

      * 

      * @return  true if view context contains non-empty courseId, false otherwise

      */

     private boolean hasCourseId(ViewContext viewContext){

             return viewContext != null && viewContext.getId() != null && !viewContext.getId().isEmpty();

     }

     /**

      * Retrieves the version independent from the course data model

      * 

      * @param courseModel

      * @return version independent id of course

      */

     private String getCourseVersionIndId(DataModel courseModel){

             return (String)courseModel.get(CreditCourseConstants.VERSION_INFO + QueryPath.getPathSeparator() + CreditCourseConstants.VERSION_IND_ID);            

     }

     /**

      * Retrieves the version sequence number from the course data model

      * 

      * @param courseModel

      * @return version sequence number id of course

      */

     private Long getCourseVersionSequenceNumber(DataModel courseModel){

                    return (Long)courseModel.get(CreditCourseConstants.VERSION_INFO + QueryPath.getPathSeparator() + CreditCourseConstants.VERSION_SEQ_NUMBER);

     }

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

                 Application.getApplicationContext().getSecurityContext().checkScreenPermission("cluModifyItem",

                                 new Callback<Boolean>() {

                                         @Override

                                         public void exec(Boolean result) {

                                                 hasAdminAccess = result;

                                    if (hasAdminAccess){

                                                     //Admin users have the option to make modifications to the course administratively or via the

                                             //curriculum review process. Clicking on the "Modify Course" item will present the user with

                                             //a modify dialog to allow them to choose the method of modification.

                                                     buildModifyDialog(viewContext, modifyPath, model);

                                     } else {

                                             //Non-admin users are only allowed to make modifications via proposal curriculum review process.

                                             //Clicking the "Modify Course" item will simply navigate user directly to modify course proposal screen.

                                         checkLatestVersion(viewContext, modifyPath, model, true);

                                     }

                                         }

                                 });

         }

 }