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

 import java.util.ArrayList;

 import java.util.List;

 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.configurable.mvc.layouts.BasicLayoutWithContentHeader;

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

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

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

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

 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.widgets.KSButton;

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

 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.core.assembly.data.Data;

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

 import org.kuali.student.core.statement.dto.StatementTypeInfo;

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

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

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

 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.views.SelectVersionsView;

 import org.kuali.student.lum.lu.ui.course.client.views.ShowVersionView;

 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.user.client.Window;

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

 public class VersionsController extends BasicLayoutWithContentHeader{

         public static enum Views{VERSION_SELECT, VERSION_VIEW, VERSION_COMPARE}

         private SelectVersionsView select = new SelectVersionsView(this, "", Views.VERSION_SELECT);

         private ShowVersionView view;

         private VerticalSectionView compare;

     private static final String MSG_GROUP = "course";

     private String type = "course";

     private String state = "draft";

     private String groupName = LUUIConstants.COURSE_GROUP_NAME;

         CourseSummaryConfigurer summaryConfigurer;

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

         DataModelDefinition definition;

         private DataModel cluModel1;

         private DataModel cluModel2;

         private String lastId1 = "";

         private String lastId2 = "";

         private HorizontalSection workflowVersionInfoSection = new HorizontalSection();

         private boolean initialized = false;

         private String versionIndId = "";

         private String currentVersionId = "";

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

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

         private KSLabel statusLabel = new KSLabel("");

         public VersionsController(Enum<?> viewType) {

                 super(VersionsController.class.toString());

                 this.addView(select);

         this.setDefaultView(Views.VERSION_SELECT);

         this.setName("Versions");

         this.setViewEnum(viewType);

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

                     @Override

                     public void onClick(ClickEvent event) {

                             VersionsController.this.showDefaultView(Controller.NO_OP_CALLBACK);

                     }

             });

         versionHistoryButton.addStyleName("versionHistoryLink");

         workflowVersionInfoSection.addWidget(this.getStatusLabel());

         workflowVersionInfoSection.addWidget(this.generateActionDropDown());

         workflowVersionInfoSection.addWidget(versionHistoryButton);

         this.getHeader().addWidget(workflowVersionInfoSection);

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

         initialize();

     }        

         public void setVersionIndId(String versionIndId) {

                 this.versionIndId = versionIndId;

         }

         private void initialize() {

         super.setDefaultModelId("Model");

         super.registerModel("Model", new ModelProvider<DataModel>() {

             @Override

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

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

                             getCourseFromCluId(getViewContext().getId(), 1, callback, true);

                 }

                 else{

                         callback.onModelReady(null);

                 }

             }

         });

         super.registerModel("ComparisonModel", new ModelProvider<DataModel>() {

             @Override

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

                     if(getViewContext().getAttribute("docId2") != null && !getViewContext().getAttribute("docId2").isEmpty()){

                             getCourseFromCluId(getViewContext().getAttribute("docId2"), 2, callback, false);        

                     }

                     else{

                             callback.onModelReady(null);

                     }

             }

         });

         }

         @SuppressWarnings("unchecked")    

         private void getCourseFromCluId(final String courseId, final int modelNum, final ModelRequestCallback callback, final boolean id1Model){

                 KSBlockingProgressIndicator.addTask(loadDataTask);

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

                 @Override

                 public void handleFailure(Throwable caught) {

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

                     callback.onRequestFail(caught);

                     KSBlockingProgressIndicator.removeTask(loadDataTask);

                 }

                 @Override

                 public void onSuccess(Data result) {

                         if(modelNum == 1){

                                 cluModel1 = new DataModel();

                                 cluModel1.setDefinition(definition);

                                 cluModel1.setRoot(result);

                                 if(courseId.equals(currentVersionId)){

                                         String name = "Version " + cluModel1.get("versionInfo/sequenceNumber") + " (current version)";

                                         cluModel1.setModelName(name);

                                         view.setName(name);

                                         view.showWarningMessage(false);

                                 }

                                 else{

                                         String name = "Version " + cluModel1.get("versionInfo/sequenceNumber");

                                         cluModel1.setModelName(name);

                                         view.setName(name);

                                         view.showWarningMessage(true);

                                 }

                                 updateState(cluModel1);

                              callback.onModelReady(cluModel1);

                              lastId1 = courseId;

                         }

                         else{

                                 cluModel2 = new DataModel();

                                 cluModel2.setDefinition(definition);

                                 cluModel2.setRoot(result);

                                 if(courseId.equals(currentVersionId)){

                                         cluModel2.setModelName("Version " + cluModel2.get("versionInfo/sequenceNumber") + " (current version)");

                                 }

                                 else{

                                         cluModel2.setModelName("Version " + cluModel2.get("versionInfo/sequenceNumber"));

                                 }

                              callback.onModelReady(cluModel2);

                              lastId2 = courseId;

                         }

                     KSBlockingProgressIndicator.removeTask(loadDataTask);

                 }

             });

         }

     @Override

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

             KSBlockingProgressIndicator.addTask(loadDataTask);

         init(new Callback<Boolean>() {

             @Override

             public void exec(Boolean result) {

                 if (result) {

                         VersionsController.super.showDefaultView(new Callback<Boolean>() {

                                 @Override

                                 public void exec(Boolean result) {

                                         onReadyCallback.exec(result);

                                         KSBlockingProgressIndicator.removeTask(loadDataTask);

                                 }

                         });

                 } else {

                     onReadyCallback.exec(false);

                     KSBlockingProgressIndicator.removeTask(loadDataTask);

                 }

             }

         });

     }

     @Override

     public void beforeShow(Callback<Boolean> onReadyCallback) {

             workflowVersionInfoSection.setVisible(false);

             this.getHeader().showPrint(false);

             showDefaultView(onReadyCallback);

     }

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

         if (initialized) {

             onReadyCallback.exec(true);

         } else {

                 KSBlockingProgressIndicator.addTask(loadDataTask);

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

                         public void handleFailure(Throwable caught) {

                                 initialized = false;

                         onReadyCallback.exec(false);

                         KSBlockingProgressIndicator.removeTask(loadDataTask);

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

                 }

                 public void onSuccess(Metadata result) {

                         definition = new DataModelDefinition(result);

                     KSBlockingProgressIndicator.removeTask(loadDataTask);

                     configureScreens(onReadyCallback);

                 }

                   });

         }

     }

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

         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);

                     }

                 }

                 summaryConfigurer = new CourseSummaryConfigurer(type, state, groupName, definition, stmtTypesOut, VersionsController.this, "Model");

                 view = new ShowVersionView(Views.VERSION_VIEW, "Version", "Model", VersionsController.this, stmtTypesOut);

                 compare = summaryConfigurer.generateCourseSummarySection();

                 compare.setLayoutController(VersionsController.this);

                 compare.setSectionTitle("Compare Versions");

                 compare.setName("Compare Versions");

                 compare.setViewEnum(Views.VERSION_COMPARE);

                 VersionsController.this.addView(view);

                 VersionsController.this.addView(compare);

                 initialized = true;

                 onReadyCallback.exec(true);

             }

         });

     }

     public Widget generateActionDropDown(){

             CourseWorkflowActionList actionList = new CourseWorkflowActionList(this.getMessage("cluActionsLabel"));

             actionDropDownWidgets.add(actionList);

             return actionList;

     }

     private void updateState(final DataModel cluModel) {

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

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

                     for(CourseWorkflowActionList widget: actionDropDownWidgets){

                                 widget.init(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));

                                     }

                                 }

                                 });

                                 widget.updateCourseActionItems(cluModel);

                                 widget.setEnabled(true);

                                 if(widget.isEmpty()) {

                                         widget.setVisible(false);

                                 }

                                 else{

                                         widget.setVisible(true);

                                 }

                         }

             }

     }

         public Widget getStatusLabel() {

                 statusLabel.setStyleName("courseStatusLabel");

                 return statusLabel;

         }

     public DataModelDefinition getDefinition(){

             return definition;

     }

         public void setCurrentVersionId(String id) {

                 this.currentVersionId = id;

         }

         public String getCurrentVersionId() {

                 return currentVersionId;

         }

         public String getVersionIndId() {

                 return versionIndId;

         }

     public String getMessage(String courseMessageKey) {

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

             if (msg == null) {

                     msg = courseMessageKey;

             }

             return msg;

     }

         @Override

         public <V extends Enum<?>> void showView(V viewType, Callback<Boolean> onReadyCallback) {

                 if(viewType != Views.VERSION_SELECT){

                         workflowVersionInfoSection.setVisible(true);

                         this.getHeader().showPrint(true);

                 }

                 else{

                         workflowVersionInfoSection.setVisible(false);

                         this.getHeader().showPrint(false);

                 }

                 super.showView(viewType, onReadyCallback);

         }

         public void setCurrentTitle(String currentTitle) {

             this.getHeader().setTitle(currentTitle);

         }

 }