/**

  * 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.program.client.requirements;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

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

 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.SectionTitle;

 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.View;

 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.KSProgressIndicator;

 import org.kuali.student.common.ui.client.widgets.buttongroups.ButtonEnumerations;

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

 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.versionmanagement.dto.VersionDisplayInfo;

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

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

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

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

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

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

 import org.kuali.student.lum.lu.dto.CluInfo;

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

 import org.kuali.student.lum.program.client.rpc.StatementRpcService;

 import org.kuali.student.lum.program.client.rpc.StatementRpcServiceAsync;

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

 import com.google.gwt.core.client.GWT;

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

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

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

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

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

 public class ProgramRequirementsManageView extends VerticalSectionView {

     private StatementRpcServiceAsync statementRpcServiceAsync = GWT.create(StatementRpcService.class);

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

     protected static final String TEMLATE_LANGUAGE = "en";

     protected static final String RULEEDIT_TEMLATE = "KUALI.RULE";

     protected static final String RULEPREVIEW_TEMLATE = RULEEDIT_TEMLATE + ".PREVIEW";

     protected static final String COMPOSITION_TEMLATE = "KUALI.RULE.COMPOSITION";

     private static final String LU_NAMESPACE = "http://student.kuali.org/wsdl/lu";

     private static final String CLU_NAMESPACE_URI = "{" + LU_NAMESPACE + "}cluInfo";

     private ProgramRequirementsViewController parentController;

     //view's widgets

     private VerticalPanel layout = new VerticalPanel();

     private ReqCompEditWidget editReqCompWidget;

     private RuleManageWidget ruleManageWidget;

     private SimplePanel twiddlerPanel = new SimplePanel();

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

     //view's data

     private StatementTreeViewInfo rule = null;

     private boolean isInitialized = false;

     private boolean isNewRule = false;

     private ReqComponentInfo editedReqCompInfo = null;

     private Integer internalProgReqID = null;

     private String originalReqCompNL;

     private String originalLogicExpression;

     //   private boolean isLocalDirty = false;

         private BlockingTask creatingRuleTask = new BlockingTask("Creating Rule");

     public ProgramRequirementsManageView(ProgramRequirementsViewController parentController, Enum<?> viewEnum, String name, String modelId) {

         super(viewEnum, name, modelId);

         this.parentController = parentController;

     }

     @Override

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

         retrieveAndSetupReqCompTypes(); //TODO cache it for each statement type?

         if (!isInitialized) {

             setupHandlers();

             draw();

             isInitialized = true;

         }

         onReadyCallback.exec(true);

     }

     private void setupHandlers() {

         editReqCompWidget.setReqCompConfirmButtonClickCallback(actionButtonClickedReqCompCallback);

         editReqCompWidget.setNewReqCompSelectedCallbackCallback(newReqCompSelectedCallbackCallback);

         editReqCompWidget.setRetrieveCompositionTemplateCallback(retrieveCompositionTemplateCallback);

         editReqCompWidget.setRetrieveFieldsMetadataCallback(retrieveFieldsMetadataCallback);

         editReqCompWidget.setRetrieveCustomWidgetCallback(retrieveCustomWidgetCallback);

         ruleManageWidget.setReqCompEditButtonClickCallback(editReqCompCallback);

     }

     private void draw() {

         remove(layout);

         layout.clear();

         //STEP 1

         SectionTitle title = SectionTitle.generateH3Title(getLabel(ProgramMsgConstants.PROGRAMREQUIREMENTS_MANAGEVIEWPAGESTEP1TITLE));

         title.setStyleName("KS-Program-Requirements-Manage-Step-header1");  //make the header orange

         layout.add(title);

         layout.add(editReqCompWidget);

         //STEP 2

         title = SectionTitle.generateH3Title(getLabel(ProgramMsgConstants.PROGRAMREQUIREMENTS_MANAGEVIEWPAGESTEP2TITLE));

         title.setStyleName("KS-Program-Requirements-Manage-Step-header2");  //make the header orange

         layout.add(title);

         layout.add(ruleManageWidget);

         //add progressive indicator when rules are being simplified

         KSProgressIndicator twiddler = new KSProgressIndicator();

         twiddler.setVisible(false);

         twiddlerPanel.setWidget(twiddler);

         layout.add(twiddlerPanel);

         addWidget(layout);

         displaySaveButton();

     }

     private void displaySaveButton() {

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

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

              @Override

             public void exec(final ButtonEnumerations.ButtonEnum result) {

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

                     @Override

                     public void exec(View preview) {

                         //update rules data model and summary view

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

                             ProgramRequirementInfo affectedRule = ((ProgramRequirementsSummaryView) preview).getRules().updateRules(getRuleTree(), internalProgReqID, isNewRule());

                             ((ProgramRequirementsSummaryView) preview).updateRequirementWidgets(affectedRule);                            

                         }

                         isDirty = false;

                         parentController.showView(ProgramRequirementsViewController.ProgramRequirementsViews.PREVIEW);

                     }

                 });

              }

         });

         addWidget(actionCancelButtons);

     }

     // called by requirement display widget when user wants to edit or add a sub-rule

     public void setRuleTree(StatementTreeViewInfo stmtTreeInfo, boolean newRuleFlag, Integer internalProgReqID) {

         if (!isInitialized) {

             editReqCompWidget = new ReqCompEditWidget(ProgramRequirementsSummaryView.NEW_REQ_COMP_ID);

             ruleManageWidget = new RuleManageWidget();

             ruleManageWidget.setReqCompEditButtonClickCallback(editReqCompCallback);

             ruleManageWidget.setRuleChangedButtonClickCallback(ruleChangedCallback);

         }

         this.internalProgReqID = internalProgReqID;

         editedReqCompInfo = null;

         rule = RulesUtil.clone(stmtTreeInfo);

         isNewRule = newRuleFlag;

         originalReqCompNL = getAllReqCompNLs();

         //update screen elements

         editReqCompWidget.setupNewReqComp();

         ruleManageWidget.redraw(rule, false);

        // originalLogicExpression = ruleManageWidget.getLogicExpression();

     }

     //retrieve the latest version from rule table widget and update the local copy

     public StatementTreeViewInfo getRuleTree() {

         rule = ruleManageWidget.getStatementTreeViewInfo();

         return rule;

     }

     public boolean isNewRule() {

         return isNewRule;

     }

     //called when user clicked on rule 'edit' link

     protected Callback<ReqComponentInfo> editReqCompCallback = new Callback<ReqComponentInfo>(){

         public void exec(ReqComponentInfo reqComp) {

             setEnabled(false);

             editReqCompWidget.setupExistingReqComp(reqComp);

             editedReqCompInfo = reqComp;

         }

     };

     protected Callback<Boolean> ruleChangedCallback = new Callback<Boolean>(){

         public void exec(Boolean ruleChanged) {

             actionCancelButtons.getButton(ButtonEnumerations.SaveCancelEnum.SAVE).setEnabled(ruleChanged);

         }

     };

     protected void setEnabled(boolean enabled) {

         ruleManageWidget.setEnabled(enabled);

         actionCancelButtons.getButton(ButtonEnumerations.SaveCancelEnum.SAVE).setEnabled(enabled);

     }

     @Override

     public boolean isDirty() {

         if (!isInitialized) {

             return false;

         }

         //TODO until we figure out how to detect changes, always return true

         return true;

         //first check logic expression

 //        if (!ruleManageWidget.getLogicExpression().equals(originalLogicExpression)) {

 //            return true;

 //        }

         //next check NL for req. components

       //  if ((originalNL == null) && (rule.getNaturalLanguageTranslation() == null)) {

       //      return !ruleManageWidget.getLogicExpression().equals(originalLogicExpression);

       //  }

         //TODO how to check whether rule changed or not?

        // !(ruleManageWidget.getLogicExpression().equals(originalLogicExpression) && getAllReqCompNLs().equals(originalReqCompNL));

     }

     private String getAllReqCompNLs() {

             StringBuilder NL = new StringBuilder();

         for (StatementTreeViewInfo tree : rule.getStatements()) {

             for (ReqComponentInfo reqComp : tree.getReqComponents()) {

                 NL.append(reqComp.getNaturalLanguageTranslation());

             }

         }

         return NL.toString();

     }

     //called when user clicks 'Add Rule' or 'Update Rule' when editing a req. component

     protected Callback<ReqComponentInfoUi> actionButtonClickedReqCompCallback = new Callback<ReqComponentInfoUi>(){

         public void exec(final ReqComponentInfoUi reqComp) {

             editReqCompWidget.setupNewReqComp();

             setEnabled(true);

             //true if user cancel adding/editing req. component

             if (reqComp == null) {

                 return;

             }

             KSBlockingProgressIndicator.addTask(creatingRuleTask);

             //1. update NL for the req. component

             statementRpcServiceAsync.translateReqComponentToNLs(reqComp, new String[]{RULEEDIT_TEMLATE,RULEPREVIEW_TEMLATE}, TEMLATE_LANGUAGE, new KSAsyncCallback<List<String>>() {

                 public void handleFailure(Throwable caught) {

                     KSBlockingProgressIndicator.removeTask(creatingRuleTask);

                     Window.alert(caught.getMessage());

                     GWT.log("translateReqComponentToNL failed", caught);

                }

                 public void onSuccess(final List<String> reqCompNL) {

                     reqComp.setNaturalLanguageTranslation(reqCompNL.get(0));

                     reqComp.setPreviewNaturalLanguageTranslation(reqCompNL.get(1));

                     //2. add / update req. component

                     rule = ruleManageWidget.getStatementTreeViewInfo();  //TODO ?

                     if (editedReqCompInfo == null) {  //add req. component

                         if (rule.getStatements() != null && !rule.getStatements().isEmpty()) {

                             StatementTreeViewInfo newStatementTreeViewInfo = new StatementTreeViewInfo();

                             newStatementTreeViewInfo.setId(ProgramRequirementsSummaryView.NEW_STMT_TREE_ID + Integer.toString(ProgramRequirementsSummaryView.tempStmtTreeID++));

                             newStatementTreeViewInfo.setOperator(rule.getStatements().get(0).getOperator());

                             newStatementTreeViewInfo.getReqComponents().add(reqComp);

                             rule.getStatements().add(newStatementTreeViewInfo);

                         } else {

                             rule.getReqComponents().add(reqComp);

                             //set default operator between req. components of the rule

                             if (rule.getOperator() == null) {

                                 rule.setOperator(StatementOperatorTypeKey.AND);

                             }

                         }

                     } else {    //update req. component

                         editedReqCompInfo.setNaturalLanguageTranslation(reqComp.getNaturalLanguageTranslation());

                         editedReqCompInfo.setReqCompFields(reqComp.getReqCompFields());

                         editedReqCompInfo.setType(reqComp.getType());

                         editedReqCompInfo = null;  //de-reference from existing req. component

                     }

                     ruleManageWidget.redraw(rule, true);

                     KSBlockingProgressIndicator.removeTask(creatingRuleTask);

                 }

             });

         }

     };

     //called when user selects a rule type in the editor

     protected Callback<ReqComponentInfo> newReqCompSelectedCallbackCallback = new Callback<ReqComponentInfo>(){

         public void exec(final ReqComponentInfo reqComp) {

             setEnabled(false);

         }

     };

     private void retrieveAndSetupReqCompTypes() {

         statementRpcServiceAsync.getReqComponentTypesForStatementType(rule.getType(), new KSAsyncCallback<List<ReqComponentTypeInfo>>() {

             public void handleFailure(Throwable cause) {

                     GWT.log("Failed to get req. component types for statement of type:" + rule.getType(), cause);

                     Window.alert("Failed to get req. component types for statement of type:" + rule.getType());

             }

             public void onSuccess(final List<ReqComponentTypeInfo> reqComponentTypeInfoList) {

                 if (reqComponentTypeInfoList == null || reqComponentTypeInfoList.size() == 0) {

                     GWT.log("Missing Requirement Component Types", null);

                     Window.alert("Missing Requirement Component Types");

                     return;

                 }

                 editReqCompWidget.setReqCompList(reqComponentTypeInfoList);

                 editReqCompWidget.setCustomWidgets(getCustomWidgets(reqComponentTypeInfoList));                

             }

         });

     }

     private Map<String, Widget> getCustomWidgets(List<ReqComponentTypeInfo> reqComponentTypeInfoList) {

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

         for (ReqComponentTypeInfo reqCompTypeInfo : reqComponentTypeInfoList) {

             for (ReqCompFieldTypeInfo fieldTypeInfo : reqCompTypeInfo.getReqCompFieldTypeInfos()) {

                 if (RulesUtil.isGradeWidget(fieldTypeInfo.getId())) {

                     customWidgets.put("kuali.reqComponent.field.type.grade.id", new GradeWidget());

                 } else if (RulesUtil.isCourseWidget(fieldTypeInfo.getId())) {

                     final CourseWidget courseWidget = GWT.create(CourseWidget.class);

                     courseWidget.addGetCluNameCallback(new Callback() {

                         @Override

                         public void exec(Object id) {

                             statementRpcServiceAsync.getCurrentVersion(CLU_NAMESPACE_URI, (String)id, new AsyncCallback<VersionDisplayInfo>() {

                                 @Override

                                 public void onFailure(Throwable throwable) {

                                     Window.alert(throwable.getMessage());

                                     GWT.log("Failed to retrieve clu for id: '" +  "'", throwable);

                                 }

                                 @Override

                                 public void onSuccess(final VersionDisplayInfo versionInfo) {

                                     statementRpcServiceAsync.getClu(versionInfo.getId(), new AsyncCallback<CluInfo>() {

                                         @Override

                                         public void onFailure(Throwable throwable) {

                                             Window.alert(throwable.getMessage());

                                             GWT.log("Failed to retrieve clu", throwable);

                                         }

                                         @Override

                                         public void onSuccess(CluInfo cluInfo) {

                                             courseWidget.setLabelContent(cluInfo.getVersionInfo().getVersionIndId(), cluInfo.getOfficialIdentifier().getCode());

                                         }

                                     });

                                 }

                             });

                         }

                     });

                     customWidgets.put("kuali.reqComponent.field.type.course.clu.id", courseWidget);

                 } else if (RulesUtil.isProgramWidget(fieldTypeInfo.getId())) {

                     final ProgramWidget programWidget = new ProgramWidget();

                     programWidget.addGetCluNameCallback(new Callback() {

                         @Override

                         public void exec(Object id) {

                             statementRpcServiceAsync.getCurrentVersion(CLU_NAMESPACE_URI, (String)id, new AsyncCallback<VersionDisplayInfo>() {

                                 @Override

                                 public void onFailure(Throwable throwable) {

                                     Window.alert(throwable.getMessage());

                                     GWT.log("Failed to retrieve clu for id: '" +  "'", throwable);

                                 }

                                 @Override

                                 public void onSuccess(final VersionDisplayInfo versionInfo) {

                                     statementRpcServiceAsync.getClu(versionInfo.getId(), new AsyncCallback<CluInfo>() {

                                         @Override

                                         public void onFailure(Throwable throwable) {

                                             Window.alert(throwable.getMessage());

                                             GWT.log("Failed to retrieve clu", throwable);

                                         }

                                         @Override

                                         public void onSuccess(CluInfo cluInfo) {

                                             programWidget.setLabelContent(cluInfo.getVersionInfo().getVersionIndId(), cluInfo.getOfficialIdentifier().getCode());

                                         }

                                     });

                                 }

                             });

                         }

                     });

                     customWidgets.put("kuali.reqComponent.field.type.program.clu.id", programWidget);

                 }

             }

         }

         return customWidgets;

     }

     //called when user selects a rule type in the rule editor

     protected Callback<ReqComponentInfo> retrieveCompositionTemplateCallback = new Callback<ReqComponentInfo>(){

         public void exec(final ReqComponentInfo reqComp) {

             statementRpcServiceAsync.translateReqComponentToNL(reqComp, COMPOSITION_TEMLATE, TEMLATE_LANGUAGE, new KSAsyncCallback<String>() {

                 public void handleFailure(Throwable caught) {

                     Window.alert(caught.getMessage());

                     GWT.log("translateReqComponentToNL failed for req. comp. type: '" + reqComp.getType() + "'",caught);

                 }

                 public void onSuccess(final String compositionTemplate) {

                     editReqCompWidget.displayFieldsStart(compositionTemplate);

                 }

             });

         }

     };

     protected Callback<List<String>> retrieveFieldsMetadataCallback = new Callback<List<String>>(){

         public void exec(final List<String> fieldTypes) {

             if (fieldTypes.contains("kuali.reqComponent.field.type.grade.id")) {

                 fieldTypes.add("kuali.reqComponent.field.type.gradeType.id");

             }

             metadataServiceAsync.getMetadataList(ReqCompFieldInfo.class.getName(), fieldTypes, null, new KSAsyncCallback<List<Metadata>>() {

                 public void handleFailure(Throwable caught) {

                     Window.alert(caught.getMessage());

                     GWT.log("getMetadataList failed for req. comp. types: '" + fieldTypes.toString() + "'",caught);

                 }

                 public void onSuccess(final List<Metadata> metadataList) {

                     editReqCompWidget.displayFieldsEnd(metadataList);

                 }

             });

         }

     };

     protected Callback<String> retrieveCustomWidgetCallback = new Callback<String>(){

         public void exec(final String fieldType) {

             if (RulesUtil.isCluSetWidget(fieldType)) {

                 String clusetType = "kuali.cluSet.type.Course";

                 if (fieldType.toLowerCase().indexOf("program") > 0) {

                     clusetType = "kuali.cluSet.type.Program";

                 }

                 editReqCompWidget.displayCustomWidget(fieldType, new BuildCluSetWidget(new CluSetRetrieverImpl(), clusetType, false));

             }

         }

     };

     public Integer getInternalProgReqID() {

         return internalProgReqID;

     }

     private String getLabel(String messageKey) {

         return Application.getApplicationContext().getUILabel(ProgramMsgConstants.PROGRAM_MSG_GROUP, messageKey);

     }

 }