package org.kuali.student.lum.program.client.requirements;

 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.shared.HandlerManager;

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

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

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

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

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

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

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

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

 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.FieldDescriptor;

 import org.kuali.student.common.ui.client.configurable.mvc.SectionTitle;

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

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

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

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

 import org.kuali.student.common.ui.client.service.MetadataRpcService;

 import org.kuali.student.common.ui.client.service.MetadataRpcServiceAsync;

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

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

 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.buttongroups.ButtonEnumerations;

 import org.kuali.student.common.ui.client.widgets.dialog.ConfirmationDialog;

 import org.kuali.student.common.ui.client.widgets.field.layout.button.ActionCancelGroup;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.MessageKeyInfo;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.SpanPanel;

 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.validation.dto.ValidationResultInfo;

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

 import org.kuali.student.core.statement.ui.client.widgets.rules.RulePreviewWidget;

 import org.kuali.student.core.statement.ui.client.widgets.rules.RulesUtil;

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

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

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

 import org.kuali.student.lum.program.client.ProgramConstants;

 import org.kuali.student.lum.program.client.ProgramSections;

 import org.kuali.student.lum.program.client.properties.ProgramProperties;

 import org.kuali.student.lum.program.client.widgets.EditableHeader;

 import org.kuali.student.lum.program.dto.ProgramRequirementInfo;

 import java.util.*;

 public class ProgramRequirementsSummaryView extends VerticalSectionView {

     private MetadataRpcServiceAsync metadataServiceAsync = GWT.create(MetadataRpcService.class);

     private static CluSetRetriever cluSetRetriever = new CluSetRetrieverImpl();

     //view's widgets

     private FlowPanel layout = new FlowPanel();

     private ActionCancelGroup actionCancelButtons = new ActionCancelGroup(ButtonEnumerations.SaveCancelEnum.SAVE, ButtonEnumerations.SaveCancelEnum.CANCEL);

     private BasicLayout reqCompController;

     private FlowPanel holdFieldsPanel = new FlowPanel();

     //view's data

     private ProgramRequirementsViewController parentController;

     private ProgramRequirementsDataModel rules;

     private boolean isReadOnly;

     public static int tempStmtTreeID = 9999;

     public static final String NEW_PROG_REQ_ID = "NEWPROGREQ";

     public static final String NEW_STMT_TREE_ID = "NEWSTMTTREE";

     public static final String NEW_REQ_COMP_ID = "NEWREQCOMP";

     private enum ProgramReqDialogView {

         VIEW

     }

     private static final String PROG_REQ_MODEL_ID = "progReqModelId";

     private DataModel progReqData;

     private BlockingTask gettingMetadataTask = new BlockingTask("Loading");

     private static Metadata dialogMetadata = null;  //simple caching

     private Map<String, SpanPanel> perProgramRequirementTypePanel = new LinkedHashMap<String, SpanPanel>();

     private Map<String, KSLabel> perProgramRequirementTypeTotalCredits = new LinkedHashMap<String, KSLabel>();

     public ProgramRequirementsSummaryView(final ProgramRequirementsViewController parentController, HandlerManager eventBus, Enum<?> viewEnum, String name,

                                           String modelId, boolean isReadOnly) {

         super(viewEnum, name, modelId);

         init(parentController, eventBus, isReadOnly);

     }

     public ProgramRequirementsSummaryView(final ProgramRequirementsViewController parentController, HandlerManager eventBus, Enum<?> viewEnum, String name,

                                           String modelId, boolean isReadOnly, EditableHeader header) {

         super(viewEnum, name, modelId, header);

         init(parentController, eventBus, isReadOnly);

     }

     private void init(ProgramRequirementsViewController parentController, HandlerManager eventBus, boolean isReadOnly) {

         this.parentController = parentController;

         this.isReadOnly = isReadOnly;

         rules = new ProgramRequirementsDataModel(eventBus);

         if (!isReadOnly) {

             setupSaveCancelButtons();

         }

     }

     @Override

     public boolean isDirty() {

         return rules.isDirty();

     }

     protected ProgramRequirementsDataModel getRules() {

         return rules;

     }

     @Override

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

         if (!rules.isInitialized() || parentController.reloadFlag) {

             retrieveProgramRequirements(onReadyCallback);

             return;

         }

         onReadyCallback.exec(true);

     }

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

             //Added blocking progress indicator while requirements are loaded.

             final BlockingTask ruleBlockingTask = new BlockingTask("Retrieving requirements");

             KSBlockingProgressIndicator.addTask(ruleBlockingTask);

         rules.retrieveProgramRequirements(parentController, ProgramConstants.PROGRAM_MODEL_ID, new Callback<Boolean>() {

             @Override

             public void exec(Boolean result) {

                 if (result) {

                     displayRules();

                 }

                 KSBlockingProgressIndicator.removeTask(ruleBlockingTask);

                 onReadyCallback.exec(result);

             }

         });

     }

     public void storeRules(final Callback<Boolean> callback) {

         rules.updateProgramEntities(new Callback<List<ProgramRequirementInfo>>() {

             @Override

             public void exec(List<ProgramRequirementInfo> programReqInfos) {

                 for (ProgramRequirementInfo programReqInfo : programReqInfos) {

                     updateRequirementWidgets(programReqInfo);

                 }

                 callback.exec(true);

             }

         });

     }

      public void justStoreRules(final Callback<Boolean> callback) {

         rules.updateProgramEntities(new Callback<List<ProgramRequirementInfo>>() {

             @Override

             public void exec(List<ProgramRequirementInfo> programReqInfos) {

                 callback.exec(true);

             }

         });

     }

     public void revertRuleChanges() {

         rules.revertRuleChanges();

         displayRules();

     }

     protected void updateRequirementWidgets(ProgramRequirementInfo programReqInfo) {

         if (programReqInfo != null) {

             StatementTypeInfo affectedStatementTypeInfo = rules.getStmtTypeInfo(programReqInfo.getStatement().getType());

             SpanPanel reqPanel = perProgramRequirementTypePanel.get(affectedStatementTypeInfo.getId());

             //this happens if user previously deleted requirement but didn't save when moving to another section

             //add widget

             if (reqPanel.getWidgetCount() == 0) {

                 reqPanel.add(addProgramRequirement(reqPanel, programReqInfo));

                 return;

             }

             //replace widget with a new version

             for (int i = 0; i < reqPanel.getWidgetCount(); i++) {

                 RulePreviewWidget rulePreviewWidget = (RulePreviewWidget) reqPanel.getWidget(i);

                 if (rulePreviewWidget.getInternalProgReqID().equals(rules.getInternalProgReqID(programReqInfo))) {

                     RulePreviewWidget newRulePreviewWidget = addProgramRequirement(reqPanel, programReqInfo);

                     reqPanel.insert(newRulePreviewWidget, i);

                     reqPanel.remove(rulePreviewWidget);

                     break;

                 }

             }

         }

     }

     public void displayRules() {

         remove(layout);

         layout.clear();

         //display 'Program Requirements' page title (don't add if read only because the section itself will display the title)

         if (!isReadOnly) {

             SectionTitle pageTitle = SectionTitle.generateH2Title(ProgramProperties.get().programRequirements_summaryViewPageTitle());

             //pageTitle.setStyleName("KS-Program-Requirements-Section-header");  //make the header orange

             pageTitle.addStyleName("ks-layout-header");// change the header to green

             layout.add(pageTitle);

         }

         //iterate and display rules for each Program Requirement type e.g. Entrance Requirements, Completion Requirements

         Boolean firstRequirement = true;

         perProgramRequirementTypePanel.clear();

         for (StatementTypeInfo stmtTypeInfo : rules.getStmtTypes()) {

             //create and display one type of program requirement section

             SpanPanel requirementsPanel = new SpanPanel();

             perProgramRequirementTypePanel.put(stmtTypeInfo.getId(), requirementsPanel);

             displayRequirementSectionForGivenType(requirementsPanel, stmtTypeInfo, firstRequirement);

             updateTotalCreditPerType(stmtTypeInfo.getId());

             firstRequirement = false;

             //now display each requirement for this Program Requirement type

             for (ProgramRequirementInfo ruleInfo : rules.getProgReqInfo(stmtTypeInfo.getId())) {

                 RulePreviewWidget rulePreviewWidget = addProgramRequirement(requirementsPanel, ruleInfo);

                 requirementsPanel.add(rulePreviewWidget);

             }

         }

         //save and cancel buttons

         if (!isReadOnly) {

             layout.add(actionCancelButtons);

         }

         addWidget(layout);

     }

     private void displayRequirementSectionForGivenType(final SpanPanel requirementsPanel, final StatementTypeInfo stmtTypeInfo, boolean firstRequirement) {

         //display header for this Program Requirement type e.g. Entrance Requirements; make the header plural

         SectionTitle title = SectionTitle.generateH3Title(stmtTypeInfo.getName());

         title.setStyleName((firstRequirement ? "KS-Program-Requirements-Preview-Rule-Type-First-Header" : "KS-Program-Requirements-Preview-Rule-Type-Header"));

         layout.add(title);

         //add Total Credits

         KSLabel totalCredits = new KSLabel();

         totalCredits.addStyleName("KS-Program-Requirements-Preview-Rule-Type-Credits");

         perProgramRequirementTypeTotalCredits.put(stmtTypeInfo.getId(), totalCredits);

         totalCredits.setVisible(false);

         layout.add(totalCredits);

         //add rule description

         if (!isReadOnly) {

             KSLabel ruleTypeDesc = new KSLabel(stmtTypeInfo.getDescr());

             ruleTypeDesc.addStyleName("KS-Program-Requirements-Preview-Rule-Type-Desc");

             layout.add(ruleTypeDesc);

         }

         //display "Add Rule" button if user is in 'edit' mode

         if (!isReadOnly) {

             String addRuleLabel = ProgramProperties.get().programRequirements_summaryViewPageAddRule(stmtTypeInfo.getName());

             KSButton addProgramReqBtn = new KSButton(addRuleLabel, KSButtonAbstract.ButtonStyle.FORM_SMALL);

             addProgramReqBtn.addClickHandler(new ClickHandler() {

                 public void onClick(ClickEvent event) {

                     showProgramRequirementDialog(requirementsPanel, stmtTypeInfo.getId(), null);

                 }

             });

             layout.add(addProgramReqBtn);

         }

         layout.add(requirementsPanel);

     }

     private RulePreviewWidget addProgramRequirement(final SpanPanel requirementsPanel, final ProgramRequirementInfo progReqInfo) {

         Integer internalProgReqID = rules.getInternalProgReqID(progReqInfo);

         String stmtTypeId = progReqInfo.getStatement().getType();

         int minCredits = (progReqInfo.getMinCredits() == null ? 0 : progReqInfo.getMinCredits());

         int maxCredits = (progReqInfo.getMaxCredits() == null ? 0 : progReqInfo.getMaxCredits());

         String plainDesc = (progReqInfo.getDescr() == null ? "" : progReqInfo.getDescr().getPlain());

         final RulePreviewWidget rulePreviewWidget = new RulePreviewWidget(internalProgReqID, progReqInfo.getShortTitle(),

                 getTotalCreditsString(minCredits, maxCredits),

                 plainDesc, progReqInfo.getStatement(),

                 isReadOnly, getCluSetWidgetList(progReqInfo.getStatement()));

         addRulePreviewWidgetHandlers(requirementsPanel, rulePreviewWidget, stmtTypeId, internalProgReqID);

         return rulePreviewWidget;

     }

     private void addRulePreviewWidgetHandlers(final SpanPanel requirementsPanel, final RulePreviewWidget rulePreviewWidget, final String stmtTypeId, final Integer internalProgReqID) {

         //PROGRAM REQUIREMENT handlers

         rulePreviewWidget.addProgReqEditButtonClickHandler(new ClickHandler() {

             public void onClick(ClickEvent event) {

                 showProgramRequirementDialog(requirementsPanel, stmtTypeId, internalProgReqID);

             }

         });

         rulePreviewWidget.addProgReqDeleteButtonClickHandler(new ClickHandler() {

             public void onClick(ClickEvent event) {

                 final ConfirmationDialog dialog = new ConfirmationDialog(

                         ProgramProperties.get().programRequirements_summaryViewPageDeleteRequirementDialogTitle(),

                         ProgramProperties.get().programRequirements_summaryViewPageDeleteRequirementDialogMsg());

                 dialog.getConfirmButton().addClickHandler(new ClickHandler() {

                     @Override

                     public void onClick(ClickEvent event) {

                         rules.deleteRule(internalProgReqID);

                         //remove rule from display

                         requirementsPanel.remove(rulePreviewWidget);

                         perProgramRequirementTypeTotalCredits.get(stmtTypeId).setVisible(false);

                         dialog.hide();

                     }

                 });

                 dialog.show();

             }

         });

         //SUBRULE handlers

         rulePreviewWidget.addSubRuleAddButtonClickHandler(new ClickHandler() {

             public void onClick(ClickEvent event) {

                 final StatementTreeViewInfo newSubRule = new StatementTreeViewInfo();

                 newSubRule.setId(generateStatementTreeId());

                 newSubRule.setType(stmtTypeId);

                 RichTextInfo text = new RichTextInfo();

                 text.setPlain("");

                 newSubRule.setDesc(text);

                 parentController.getView(ProgramRequirementsViewController.ProgramRequirementsViews.MANAGE, new Callback<View>() {

                     @Override

                     public void exec(View result) {

                         ((ProgramRequirementsManageView) result).setRuleTree(newSubRule, true, internalProgReqID);

                         parentController.showView(ProgramRequirementsViewController.ProgramRequirementsViews.MANAGE);

                     }

                 });

             }

         });

         rulePreviewWidget.addSubRuleEditButtonClickHandler(new Callback<RulePreviewWidget.SubRuleInfo>() {

             public void exec(final RulePreviewWidget.SubRuleInfo subRuleInfo) {

                 parentController.getView(ProgramRequirementsViewController.ProgramRequirementsViews.MANAGE, new Callback<View>() {

                     @Override

                     public void exec(View result) {

                         ((ProgramRequirementsManageView) result).setRuleTree(subRuleInfo.getSubrule(), false, subRuleInfo.getInternalProgReqID());

                         parentController.showView(ProgramRequirementsViewController.ProgramRequirementsViews.MANAGE);

                     }

                 });

             }

         });

         rulePreviewWidget.addSubRuleDeleteCallback(new Callback<Integer>() {

             public void exec(final Integer internalProgReqID) {

                 //deleting subrule does not delete the requirement (rule) itself

                 rules.markRuleAsEdited(internalProgReqID);

             }

         });

     }

     static public Map<String, Widget> getCluSetWidgetList(StatementTreeViewInfo rule) {

         Map<String, Widget> widgetList = new HashMap<String, Widget>();

         Set<String> cluSetIds = new HashSet<String>();

         findCluSetIds(rule, cluSetIds);

         for (String clusetId : cluSetIds) {

             widgetList.put(clusetId, new CluSetDetailsWidget(clusetId, cluSetRetriever));

         }

         return widgetList;

     }

     private static void findCluSetIds(StatementTreeViewInfo rule, Set<String> list) {

         List<StatementTreeViewInfo> statements = rule.getStatements();

         List<ReqComponentInfo> reqComponentInfos = rule.getReqComponents();

         if ((statements != null) && (statements.size() > 0)) {

             // retrieve all statements

             for (StatementTreeViewInfo statement : statements) {

                 findCluSetIds(statement, list); // inside set the children of this statementTreeViewInfo

             }

         } else if ((reqComponentInfos != null) && (reqComponentInfos.size() > 0)) {

             // retrieve all req. component LEAFS

             for (ReqComponentInfo reqComponent : reqComponentInfos) {

                 List<ReqCompFieldInfo> fieldInfos = reqComponent.getReqCompFields();

                 for (ReqCompFieldInfo fieldInfo : fieldInfos) {

                     if (RulesUtil.isCluSetWidget(fieldInfo.getType())) {

                         list.add(fieldInfo.getValue());

                     }

                 }

             }

         }

     }

     private void showProgramRequirementDialog(final SpanPanel requirementsPanel, final String stmtTypeId, final Integer internalProgReqID) {

         boolean isAddProgReq = (internalProgReqID == null);

         String addRuleText = (isAddProgReq ? ProgramProperties.get().programRequirements_summaryViewPageAddRule(rules.getStmtTypeName(stmtTypeId)) : "Edit " + rules.getStmtTypeName(stmtTypeId));

         final KSLightBox dialog = new KSLightBox(addRuleText);

         final ButtonEnumerations.ButtonEnum actionButton = (isAddProgReq ? ButtonEnumerations.AddCancelEnum.ADD : ButtonEnumerations.UpdateCancelEnum.UPDATE);

         ActionCancelGroup actionCancelButtons = new ActionCancelGroup(actionButton, ButtonEnumerations.UpdateCancelEnum.CANCEL);

         actionCancelButtons.addCallback(new Callback<ButtonEnumerations.ButtonEnum>() {

             @Override

             public void exec(ButtonEnumerations.ButtonEnum result) {

                 if (result == actionButton) {

                     reqCompController.updateModel();

                     //validate and retrieve fields

                     if (progReqData.getRoot().size() > 0) {

                         progReqData.validate(new Callback<List<ValidationResultInfo>>() {

                             @Override

                             public void exec(List<ValidationResultInfo> validationResults) {

                                 //do not proceed if the user input is not valid

                                 if (!reqCompController.isValid(validationResults, true, true)) {

                                     return;

                                 }

                                 //retrieve entered values and set the rule info

                                 updateProgramInfo(requirementsPanel, stmtTypeId, internalProgReqID);

                                 dialog.hide();

                             }

                         });

                     }

                 } else {

                     dialog.hide();

                 }

             }

         });

         createAddProgramReqDialog(dialog, actionCancelButtons, internalProgReqID);

     }

     private void createAddProgramReqDialog(final KSLightBox dialog, final ActionCancelGroup actionCancelButtons, final Integer internalProgReqID) {

         parentController.requestModel(ProgramConstants.PROGRAM_MODEL_ID, new ModelRequestCallback<DataModel>() {

             @Override

             public void onRequestFail(Throwable cause) {

                 Window.alert(cause.getMessage());

                 GWT.log("Unable to retrieve program model for program summary view", cause);

             }

             @Override

             public void onModelReady(DataModel model) {

                 //program has to be in the database before we can save program requirements

                 String programId = model.getRoot().get(ProgramConstants.ID);

                 if (programId == null) {

                     final ConfirmationDialog dialog = new ConfirmationDialog("Save Program Key Info", "Before saving rules please save program key info");

                     dialog.getConfirmButton().addClickHandler(new ClickHandler() {

                         @Override

                         public void onClick(ClickEvent event) {

                             dialog.hide();

                         }

                     });

                     dialog.show();

                     return;

                 }

                 if (dialogMetadata == null) {

                     KSBlockingProgressIndicator.addTask(gettingMetadataTask);

                     metadataServiceAsync.getMetadataList("org.kuali.student.lum.program.dto.ProgramRequirementInfo", "Active", new KSAsyncCallback<Metadata>() {

                         public void handleFailure(Throwable caught) {

                             KSBlockingProgressIndicator.removeTask(gettingMetadataTask);

                             Window.alert(caught.getMessage());

                             GWT.log("getMetadataList failed for ProgramRequirementInfo", caught);

                         }

                         public void onSuccess(final Metadata metadata) {

                             KSBlockingProgressIndicator.removeTask(gettingMetadataTask);

                             dialogMetadata = metadata;

                             showDialog(dialog, actionCancelButtons, metadata, internalProgReqID);

                         }

                     });

                 } else {

                     showDialog(dialog, actionCancelButtons, dialogMetadata, internalProgReqID);

                 }

             }

         });

     }

     private static FieldDescriptor createInputField(final String id, final Metadata metadata, final Map<String, Metadata> fieldDefinitionMetadata, final Map<String, FieldDescriptor> fields) {

         FieldDescriptor fd = new FieldDescriptor(id, new MessageKeyInfo("program", "program", "draft", id), metadata);

         fields.put(id, fd);

         //add field to the data model metadata

         fieldDefinitionMetadata.put(id, metadata);

         return fd;

     }

     //TODO rework to use Configurer if possible

     private void showDialog(final KSLightBox dialog, final ActionCancelGroup actionCancelButtons, Metadata metadata, Integer internalProgReqID) {

         Map<String, Metadata> fieldDefinitionMetadata = new HashMap<String, Metadata>();

         Map<String, FieldDescriptor> fields = new HashMap<String, FieldDescriptor>();

         VerticalSectionView dialogPanel = new VerticalSectionView(ProgramReqDialogView.VIEW, "", PROG_REQ_MODEL_ID, false);

         holdFieldsPanel.clear();

         dialogPanel.addField(createInputField("shortTitle", metadata.getProperties().get("shortTitle"), fieldDefinitionMetadata, fields));

         FieldDescriptor minFd = createInputField("minCredits", metadata.getProperties().get("minCredits"), fieldDefinitionMetadata, fields);

         FieldDescriptor maxFd = createInputField("maxCredits", metadata.getProperties().get("maxCredits"), fieldDefinitionMetadata, fields);

         GroupSection credits = new GroupSection();

         credits.addField(minFd);

         credits.addField(maxFd);

         dialogPanel.addSection(credits);

         final Metadata descrMetadata = metadata.getProperties().get("descr").getProperties().get("plain");

         dialogPanel.addField(createInputField("descr", descrMetadata, fieldDefinitionMetadata, fields));

         List<ConstraintMetadata> constraints = descrMetadata.getConstraints();

         dialogPanel.addWidget(new KSLabel(constraints.get(0).getMaxLength() + getUILabel("descrLimit")));

         //setup data model

         Metadata modelDefinitionMetadata = new Metadata();

         modelDefinitionMetadata.setCanView(true);

         modelDefinitionMetadata.setDataType(Data.DataType.DATA);

         modelDefinitionMetadata.setProperties(fieldDefinitionMetadata);

         progReqData = new DataModel();

         progReqData.setRoot(new Data());

         progReqData.setDefinition(new DataModelDefinition(modelDefinitionMetadata));

         //initialize fields with values if user is editing an existing rule

         if (internalProgReqID != null) {

             ProgramRequirementInfo progReq = rules.getProgReqByInternalId(internalProgReqID);

             progReqData.set(QueryPath.parse("shortTitle"), progReq.getShortTitle());

             progReqData.set(QueryPath.parse("minCredits"), progReq.getMinCredits());

             progReqData.set(QueryPath.parse("maxCredits"), progReq.getMaxCredits());

             progReqData.set(QueryPath.parse("descr"), (progReq.getDescr() == null ? "" : progReq.getDescr().getPlain()));

         }

         //setup controller

         reqCompController = new BasicLayout(null);

         reqCompController.addView(dialogPanel);

         reqCompController.setDefaultModelId(PROG_REQ_MODEL_ID);

         reqCompController.registerModel(PROG_REQ_MODEL_ID, new ModelProvider<DataModel>() {

             @Override

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

                 callback.onModelReady(progReqData);

             }

         });

         //show fields

         holdFieldsPanel.add(reqCompController);

         reqCompController.showView(ProgramReqDialogView.VIEW);

         //layout.addStyleName("KS-Advanced-Search-Window");

         holdFieldsPanel.add(actionCancelButtons);

         dialog.setSize(550, 530);

         dialog.setWidget(holdFieldsPanel);

         dialog.show();

     }

     private String getUILabel(final String id) {

         return Application.getApplicationContext().getUILabel("program", null, null, id);

     }

     private void updateProgramInfo(SpanPanel requirementsPanel, String stmtTypeId, Integer internalProgReqID) {

         ProgramRequirementInfo progReqInfo;

         if (internalProgReqID == null) {

             progReqInfo = new ProgramRequirementInfo();

             progReqInfo.setId(NEW_PROG_REQ_ID + Integer.toString(tempStmtTreeID++));   //set unique id

             progReqInfo.setType("kuali.lu.type.Requirement");

             //create a top level statement tree

             StatementTreeViewInfo stmtTree = new StatementTreeViewInfo();

             stmtTree.setId(generateStatementTreeId());

             stmtTree.setType(stmtTypeId);

             RichTextInfo text2 = new RichTextInfo();

             text2.setPlain("");

             stmtTree.setDesc(text2);

             stmtTree.setOperator(StatementOperatorTypeKey.AND); //AND is top level operator for rules within a Program Requirement

             //add new statement to the rule because even if user cancel on rule manage screen, we want to have at least one statement present

             progReqInfo.setStatement(stmtTree);

         } else {

             progReqInfo = rules.getProgReqByInternalId(internalProgReqID);

         }

         RichTextInfo text = new RichTextInfo();

         text.setPlain((String) (progReqData.getRoot().get("descr")));

         progReqInfo.setDescr(text);

         progReqInfo.setShortTitle((String) progReqData.getRoot().get("shortTitle"));

         progReqInfo.setLongTitle((String) progReqData.getRoot().get("shortTitle"));

         progReqInfo.setMinCredits((Integer) progReqData.getRoot().get("minCredits"));

         progReqInfo.setMaxCredits((Integer) progReqData.getRoot().get("maxCredits"));

         if (internalProgReqID == null) {

             rules.addRule(progReqInfo);

             RulePreviewWidget rulePreviewWidget = addProgramRequirement(requirementsPanel, progReqInfo);

             requirementsPanel.add(rulePreviewWidget);

         } else {

             rules.updateRule(internalProgReqID, progReqInfo);

             for (Object aRequirementsPanel : requirementsPanel) {

                 RulePreviewWidget rulePreviewWidget = (RulePreviewWidget) aRequirementsPanel;

                 if (rulePreviewWidget.getInternalProgReqID().equals(internalProgReqID)) {

                     rulePreviewWidget.updateProgInfoFields(progReqInfo.getShortTitle(),

                             getTotalCreditsString(progReqInfo.getMinCredits(), progReqInfo.getMaxCredits()),

                             progReqInfo.getDescr().getPlain());

                 }

             }

         }

         updateTotalCreditPerType(stmtTypeId);

     }

     private String getTotalCreditsString(int min, int max) {

         return "Expected Total Credits:" + min + "-" + max;

     }

     private void updateTotalCreditPerType(String stmtTypeId) {

         int min = 0;

         int max = 0;

         for (ProgramRequirementInfo ruleInfo : rules.getProgReqInfo(stmtTypeId)) {

             min += ruleInfo.getMinCredits();

             max += ruleInfo.getMaxCredits();

         }

         if (min != 0 || max != 0) {

             //update total

             perProgramRequirementTypeTotalCredits.get(stmtTypeId).setVisible(true);

             perProgramRequirementTypeTotalCredits.get(stmtTypeId).setText(getTotalCreditsString(min, max));

         }

     }

     private void setupSaveCancelButtons() {

         actionCancelButtons.addStyleName("KS-Program-Requirements-Save-Button");

         actionCancelButtons.addCallback(new Callback<ButtonEnumerations.ButtonEnum>() {

             @Override

             public void exec(ButtonEnumerations.ButtonEnum result) {

                 if (result == ButtonEnumerations.SaveCancelEnum.SAVE) {

                     storeRules(Controller.NO_OP_CALLBACK);

                 } else {

                     //does not work any more: HistoryManager.navigate(AppLocations.Locations.VIEW_PROGRAM.getLocation(), parentController.getViewContext());

                     parentController.getParentController().showView(ProgramSections.SUMMARY);

                 }

             }

         });

     }

     static public String generateStatementTreeId() {

         return (NEW_STMT_TREE_ID + Integer.toString(tempStmtTreeID++));

     }

 }