/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community License, Version 2.0 (the "License"); you may

  * not use this file except in compliance with the License. You may

  * obtain a copy of the License at

  *

  * http://www.osedu.org/licenses/ECL-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an "AS IS"

  * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

  * or implied. See the License for the specific language governing

  * permissions and limitations under the License.

  */

 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.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.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.layouts.DocumentLayoutController;

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

 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.WorkQueue;

 import org.kuali.student.common.ui.client.mvc.WorkQueue.WorkItem;

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

 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.KSLabel;

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

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

 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.core.statement.dto.StatementTypeInfo;

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

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

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

 import org.kuali.student.lum.lu.ui.course.client.requirements.CourseRequirementsDataModel;

 import org.kuali.student.lum.lu.ui.course.client.requirements.HasRequirements;

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

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

 import org.kuali.student.lum.lu.ui.course.client.widgets.CourseWorkflowActionList;

 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.CloseEvent;

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

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

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

 /**

  * This is a description of what this class does - Will Gomes don't forget to fill this in. 

  * 

  * @author Kuali Student Team

  *

  */

 public class ViewCourseController extends TabMenuController implements DocumentLayoutController, HasRequirements{

     private final DataModel cluModel = new DataModel(); 

     private WorkQueue modelRequestQueue;

     private String cluType = "kuali.lu.type.CreditCourse";

     private String courseId = null;

     private static final String CLU_STATE = DtoConstants.STATE_ACTIVE;

     private static final String MSG_GROUP = "course";

     private final String REFERENCE_TYPE = "referenceType.clu";

     private boolean initialized = false;

     CourseRpcServiceAsync rpcServiceAsync = GWT.create(CourseRpcService.class);

         private final BlockingTask loadDataTask = new BlockingTask("Retrieving Data....");

         private final BlockingTask initTask = new BlockingTask("Initializing....");

         private final KSLabel statusLabel = new KSLabel("");

         private final List<CourseWorkflowActionList> actionDropDownWidgets = new ArrayList<CourseWorkflowActionList>();

     private final CourseRequirementsDataModel reqDataModel;

     public ViewCourseController(Enum<?> viewType){

             super(CourseProposalController.class.getName());

         initialize();

         addStyleName("courseView");

         reqDataModel = new CourseRequirementsDataModel(this);

         this.tabPanel.addStyleName("standard-content-padding");

         this.setViewEnum(viewType);

     }

     @Override

     public void setViewContext(ViewContext viewContext) {

             super.setViewContext(viewContext);

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

                     viewContext.setPermissionType(PermissionType.OPEN);

                     this.setCourseId(viewContext.getId());

             }

     }

     private void initialize() {

         super.setDefaultModelId(CourseConfigurer.CLU_PROPOSAL_MODEL);

         super.registerModel(CourseConfigurer.CLU_PROPOSAL_MODEL, new ModelProvider<DataModel>() {

             @Override

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

                 if (modelRequestQueue == null){

                     modelRequestQueue = new WorkQueue();

                 }

                 WorkItem workItem = new WorkItem(){

                     @Override

                     public void exec(Callback<Boolean> workCompleteCallback) {

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

                             if (courseId != null){

                                 getCourseFromCluId(callback, workCompleteCallback);

                             } else{

                                 createNewCluModel(callback, workCompleteCallback);

                             }                

                         } else {

                             callback.onModelReady(cluModel);

                             workCompleteCallback.exec(true);

                         }

                     }               

                 };

                 modelRequestQueue.submit(workItem);

             }

         });

     }

     public Widget generateActionDropDown(){                            

             CourseWorkflowActionList actionList = new CourseWorkflowActionList(this.getMessage("cluActionsLabel"), getViewContext(), "/HOME/CURRICULUM_HOME/COURSE_PROPOSAL", cluModel, new Callback<String>() {

                     @Override

                     public void exec(String newState) {

                             if (newState != null) {

                     KSNotifier.add(new KSNotification(getMessage("cluStateChangeNotification" + newState), false, 5000));

                     // FIXME: this is not updating the cluModel so state will not be updated in the model.  May not be a problem.

                     statusLabel.setText("Status: " + newState);

                             } else {

                     KSNotifier.add(new KSNotification(getMessage("cluStateChangeFailedNotification"), false, 5000));

                             }

                     }

             });

         actionDropDownWidgets.add(actionList);

             return actionList;

     }

     private void init(final Callback<Boolean> onReadyCallback) {

         if (initialized) {

             onReadyCallback.exec(true);

         } else {

                 KSBlockingProgressIndicator.addTask(initTask);

                 this.setContentTitle("View Course");

                     this.setName("Course");

                     String idType = null;

                     String viewContextId = null;

                     // The switch was added due to the way permissions currently work.

                     // For a new Create Course Proposal or Modify Course we send nulls so that permissions are not checked.

                     if(getViewContext().getIdType() != null){

                 idType = getViewContext().getIdType().toString();

                 viewContextId = getViewContext().getId();

                 if(getViewContext().getIdType()==IdType.COPY_OF_OBJECT_ID){

                         viewContextId = null;

                 }

                     }

                 rpcServiceAsync.getMetadata("", null, new KSAsyncCallback<Metadata>(){

                         @Override

                 public void handleFailure(Throwable caught) {

                                 initialized = false;

                         onReadyCallback.exec(false);

                         KSBlockingProgressIndicator.removeTask(initTask);

                     throw new RuntimeException("Failed to get model definition.", caught);

                 }

                 public void onSuccess(Metadata result) {

                         DataModelDefinition def = new DataModelDefinition(result);

                     cluModel.setDefinition(def);

                     init(def, onReadyCallback);

                 }

                   });

         }

     }

     private void updateCourseActionItems() {

                 for(CourseWorkflowActionList widget: actionDropDownWidgets){

                         widget.updateCourseActionItems(cluModel);

                         widget.setEnabled(true);

                         if(widget.isEmpty()) {

                                 widget.setVisible(false);

                         }

                         else{

                                 widget.setVisible(true);

                         }

                 }

     }

     private void init(final DataModelDefinition modelDefinition, final Callback<Boolean> onReadyCallback){

         final ViewCourseConfigurer cfg = GWT.create(ViewCourseConfigurer.class);

         CourseRequirementsDataModel.getStatementTypes(new Callback<List<StatementTypeInfo>>() {

             @Override

             public void exec(List<StatementTypeInfo> stmtTypes) {

                 List<StatementTypeInfo> stmtTypesOut = new ArrayList<StatementTypeInfo>();

                 if (stmtTypes != null) {

                     for (StatementTypeInfo stmtType : stmtTypes) {

                         if (stmtType.getId().contains("kuali.statement.type.course.enrollmentEligibility") ||

                             stmtType.getId().contains("kuali.statement.type.course.creditConstraints")) {

                             continue;

                         }

                         stmtTypesOut.add(stmtType);

                     }

                 }

                 if(!initialized){

                         initialized = true;

                         cfg.setStatementTypes(stmtTypesOut);

                         cfg.setModelDefinition(modelDefinition);

                         cfg.generateLayout(ViewCourseController.this);

                 }

                 onReadyCallback.exec(true);

                 KSBlockingProgressIndicator.removeTask(initTask);

             }

         });

     }

     @SuppressWarnings("unchecked")

     @Override

     public void requestModel(Class modelType, final ModelRequestCallback callback) {

         if(modelType == ReferenceModel.class){

             if (cluModel != null){

                 ReferenceModel ref = new ReferenceModel();

                 if(cluModel.get("course/id") != null){

                     ref.setReferenceId((String)cluModel.get("course/id"));

                 } else{

                     ref.setReferenceId(null);

                 }

                 ref.setReferenceTypeKey(REFERENCE_TYPE);

                 ref.setReferenceType(cluType);

                 ref.setReferenceState(CLU_STATE);

                 callback.onModelReady(ref);

             }

         }else if (modelType == Data.class){

             requestModel(CourseConfigurer.CLU_PROPOSAL_MODEL, callback);

         } else {

             super.requestModel(modelType, callback);

         }

     }

     @SuppressWarnings("unchecked")    

     private void getCourseFromCluId(final ModelRequestCallback callback, final Callback<Boolean> workCompleteCallback){

             KSBlockingProgressIndicator.addTask(loadDataTask);

         rpcServiceAsync.getData(courseId, new KSAsyncCallback<Data>(){

             @Override

             public void handleFailure(Throwable caught) {

                 Window.alert("Error loading Course: "+caught.getMessage());

                 createNewCluModel(callback, workCompleteCallback);

                 KSBlockingProgressIndicator.removeTask(loadDataTask);

             }

             @Override

             public void onSuccess(Data result) {

                 cluModel.setRoot(result);

                 //getContainer().setTitle(getSectionTitle());

                 setHeaderTitle();

                 updateCourseActionItems();

                 callback.onModelReady(cluModel);

                 workCompleteCallback.exec(true);

                 reqDataModel.retrieveStatementTypes(cluModel.<String>get("id"), new Callback<Boolean>() {

                     @Override

                     public void exec(Boolean result) {

                         if (result) {

                             KSBlockingProgressIndicator.removeTask(loadDataTask);

                         }

                     }

                 });

             }

         });

     }

     @SuppressWarnings("unchecked")

     private void getCurrentVersion(final ModelRequestCallback callback, final Callback<Boolean> workCompleteCallback) {

             rpcServiceAsync.getData(courseId, new KSAsyncCallback<Data>(){

             @Override

             public void handleFailure(Throwable caught) {

                 Window.alert("Error loading Course: "+caught.getMessage());

                 createNewCluModel(callback, workCompleteCallback);

                 KSBlockingProgressIndicator.removeTask(loadDataTask);

             }

             @Override

             public void onSuccess(Data result) {

                 cluModel.setRoot(result);

                 //getContainer().setTitle(getSectionTitle());

                 setHeaderTitle();

                 updateCourseActionItems();

                 callback.onModelReady(cluModel);

                 workCompleteCallback.exec(true);

                 KSBlockingProgressIndicator.removeTask(loadDataTask);

             }

         });

     }

     @SuppressWarnings("unchecked")

     private void createNewCluModel(final ModelRequestCallback callback, final Callback<Boolean> workCompleteCallback){

         cluModel.setRoot(new Data());

         callback.onModelReady(cluModel);

         workCompleteCallback.exec(true);

     }

     public String getCourseId() {

         return courseId;

     }

     public String getVersionIndId() {

         return (String)cluModel.get("versionInfo/versionIndId");

     }

     public void setCourseId(String courseId) {

         this.courseId = courseId;

         this.cluModel.setRoot(new Data());        

     }

     public void clear(String cluType){

         super.clear();

         this.cluType = cluType;

         if (cluModel != null){

             this.cluModel.setRoot(new Data());            

         }

         this.courseId = null;

     }    

     @Override

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

         init(new Callback<Boolean>() {

             @Override

             public void exec(Boolean result) {

                 if (result) {

                         ViewCourseController.super.showDefaultView(onReadyCallback);

                 } else {

                     onReadyCallback.exec(false);

                 }

             }

         });

     }

     @Override

     public void beforeShow(Callback<Boolean> onReadyCallback) {

             showDefaultView(onReadyCallback);

     }

     private KSButton getQuitButton(){

         return new KSButton("Quit", new ClickHandler(){

                     public void onClick(ClickEvent event) {

                             Application.navigate("/HOME/CURRICULUM_HOME");

                     }

                 });       

     }

     protected void setHeaderTitle() {

             String title; 

             if (cluModel.get("transcriptTitle") != null){

                     title = getCourseTitle();

             }

             else{

                     title = "Course";

             }

             updateStatus();

             this.setContentTitle(title);

             this.setName(title);

             WindowTitleUtils.setContextTitle(title);

     }

     private void updateStatus() {

             if(cluModel.get("state") != null){

                     statusLabel.setText("Status: " + cluModel.get("state"));

             }

     }

     private CloseHandler<KSLightBox> createActionSubmitSuccessHandler() {

             CloseHandler<KSLightBox> handler = new CloseHandler<KSLightBox>(){

                         @Override

                         public void onClose(CloseEvent<KSLightBox> event) {

                                 //Reload the lum main entrypoint

                                 Window.Location.reload();

                         }

             };

                 return handler;

         }

     public String getMessage(String courseMessageKey) {

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

             if (msg == null) {

                     msg = courseMessageKey;

             }

             return msg;

     }

         public Widget getStatusLabel() {

                 statusLabel.setStyleName("courseStatusLabel");

                 return statusLabel;

         }

         public Widget getVersionHistoryWidget(){

                 KSButton button = new KSButton("Version History", ButtonStyle.DEFAULT_ANCHOR, new ClickHandler(){

                         @Override

                         public void onClick(ClickEvent event) {

                                 parentController.showView(ViewCourseParentController.Views.VERSIONS);

                         }

                 });

                 button.addStyleName("versionHistoryLink");

                 return button;

         }

         @Override

         public void onHistoryEvent(String historyStack) {

                 super.onHistoryEvent(historyStack);

                 if (cluModel.get("courseTitle") != null){

                         RecentlyViewedHelper.addCurrentDocument(getCourseTitle());

                 }

         }

         public String getCourseTitle(){

                 return cluModel.get("courseTitle");

         }

         // this is misleading given the current version concept.  This just gets the id of the course

         public String getCurrentId() {

                 return cluModel.get("id");

         }

     @Override

     public CourseRequirementsDataModel getReqDataModel() {

         return reqDataModel;

     }

 }