/**

  * 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.common.client.lo;

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

 import com.google.gwt.event.dom.client.BlurHandler;

 import com.google.gwt.event.dom.client.ClickEvent;

 import com.google.gwt.event.dom.client.ClickHandler;

 import com.google.gwt.event.dom.client.FocusHandler;

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

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

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

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

 import com.google.gwt.event.shared.GwtEvent;

 import com.google.gwt.event.shared.HandlerRegistration;

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

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

 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.mvc.Callback;

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

 import org.kuali.student.common.ui.client.util.UtilConstants;

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

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

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

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

 import org.kuali.student.common.ui.client.widgets.buttonlayout.ButtonRow;

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

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

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

 import org.kuali.student.common.ui.client.widgets.field.layout.layouts.FieldLayoutComponent;

 import org.kuali.student.common.ui.client.widgets.focus.FocusGroup;

 import org.kuali.student.common.ui.client.widgets.list.ListItems;

 import org.kuali.student.common.ui.client.widgets.list.SelectionChangeHandler;

 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.client.widgets.suggestbox.KSSuggestBox;

 import org.kuali.student.common.ui.client.widgets.suggestbox.SearchSuggestOracle;

 import org.kuali.student.common.ui.client.widgets.suggestbox.SuggestPicker;

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

 import org.kuali.student.core.assembly.data.Data.DataValue;

 import org.kuali.student.lum.common.client.lo.rpc.LoCategoryRpcService;

 import org.kuali.student.lum.common.client.lo.rpc.LoCategoryRpcServiceAsync;

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

 import org.kuali.student.lum.lo.dto.LoCategoryInfo;

 import org.kuali.student.lum.lo.dto.LoCategoryTypeInfo;

 import java.util.*;

 /**

  * This class allows a user to select and remove LO categories within the context of

  * LO creation. New categories can be added 'on the fly' and are persisted in the database

  * independently of LO creation

  *

  * @author Kuali Rice Team (kuali-rice@googlegroups.com)

  */

 public class LOCategoryBuilder extends Composite implements HasValue<List<LoCategoryInfo>> {

     private String type;

     private String state;

     private String repoKey;

     private String messageGroup;

     private LoCategoryRpcServiceAsync loCatRpcServiceAsync;

     private LOCategoryPicker picker;

     private AbbrButton help = new AbbrButton(AbbrButtonType.HELP);

     LOCategoryListNew categoryList;

     Map<String, LoCategoryTypeInfo> categoryTypeMap;

     VerticalPanel root = new VerticalPanel();

     private KSButton addButton = new KSButton("Add", ButtonStyle.SECONDARY);

     private KSLightBox createCategoryWindow;

     Anchor browseCategoryLink = new Anchor("Browse for categories");

     private final BlockingTask saving = new BlockingTask("Saving");

     public LOCategoryBuilder(String messageGroup, String type, String state, String loRepoKey) {

         super();

         this.type = type;

         this.state = state;

         this.repoKey = loRepoKey;

         this.messageGroup = messageGroup;

         loCatRpcServiceAsync = GWT.create(LoCategoryRpcService.class);

         picker = new LOCategoryPicker();

         categoryList = new LOCategoryListNew();

         initWidget(root);

         final FlowPanel selectedPanel = new FlowPanel();

         selectedPanel.setStyleName("KS-LOSelectedCategories");

         addButton.addClickHandler(new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 addEnteredCategory();

             }

         });

         browseCategoryLink.addClickHandler(new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 final CategoryManagement categoryManagement = new CategoryManagement(true, true);

                 categoryManagement.setDeleteButtonEnabled(false);

                 categoryManagement.setInsertButtonEnabled(false);

                 categoryManagement.setUpdateButtonEnabled(false);

                 final KSLightBox pop = new KSLightBox();

                 pop.setSize(750, 600);

                 KSButton addButton = new KSButton("Add");

                 KSButton cancelButton = new KSButton("Cancel", ButtonStyle.ANCHOR_LARGE_CENTERED);

                 pop.addButton(addButton);

                 pop.addButton(cancelButton);

                 FlowPanel mainPanel = new FlowPanel();

                 mainPanel.add(SectionTitle.generateH2Title("Select Categories"));

                 mainPanel.add(categoryManagement);

                 addButton.addClickHandler(new ClickHandler() {

                     @Override

                     public void onClick(ClickEvent event) {

                         List<LoCategoryInfo> list = categoryManagement.getSelectedCategoryList();

                         for (LoCategoryInfo info : list) {

                             addCategory(info);

                         }

                         pop.hide();

                     }

                 });

                 cancelButton.addClickHandler(new ClickHandler() {

                     @Override

                     public void onClick(ClickEvent event) {

                         pop.hide();

                     }

                 });

                 pop.setWidget(mainPanel);

                 pop.show();

             }

         });

         VerticalPanel main = new VerticalPanel();

         HorizontalPanel suggestPanel = new HorizontalPanel();

         suggestPanel.add(picker);

         suggestPanel.add(addButton);

         VerticalPanel suggestAndBrowsePanel = new VerticalPanel();

         suggestAndBrowsePanel.add(suggestPanel);

         suggestAndBrowsePanel.add(browseCategoryLink);

         selectedPanel.add(categoryList);

         String fieldHTMLId = HTMLPanel.createUniqueId();

         String title = getLabelText(LUUIConstants.LO_CATEGORY_KEY);

         String helpText = getLabelText(LUUIConstants.LO_CATEGORY_KEY + FieldLayoutComponent.HELP_MESSAGE_KEY);

         LabelPanel fieldTitle = new LabelPanel(title, fieldHTMLId);

         if (helpText != null) {

             setHelp(helpText);

         } else {

             help.setVisible(false);

         }

         fieldTitle.add(help);

         main.add(fieldTitle);

         main.add(suggestAndBrowsePanel);

         main.add(selectedPanel);

         root.add(main);

         main.addStyleName("KS-LOCategoryPicker");

         addButton.addStyleName("KS-LOCategoryPicker-Button");

     }

     public void setHelp(final String html) {

         if (html != null && !html.trim().equals("")) {

             help.setVisible(true);

             help.setHoverHTML(html);

             /*help.addClickHandler(new ClickHandler(){

                 @Override

                 public void onClick(ClickEvent event) {

                     //TODO show actual help window

                     Window.alert(html);

                 }

             });*/

         } else {

             help.setVisible(false);

         }

     }

     private void addEnteredCategory() {

         if (categoryList == null)

             categoryList = new LOCategoryListNew();

         String selectedId = picker.getSelectedId();

         if (selectedId.trim().equals("") || selectedId.equals(UtilConstants.IMPOSSIBLE_CHARACTERS)) {

             showNewCategoryWindow();

         } else {

             loCatRpcServiceAsync.getData(picker.getSelectedId(), new KSAsyncCallback<Data>() {

                 @Override

                 public void handleFailure(Throwable caught) {

                     Window.alert("getLoCategory failed " + caught.getMessage());

                 }

                 @Override

                 public void onSuccess(Data result) {

                     final LoCategoryInfo newCategory = CategoryDataUtil.toLoCategoryInfo(result);

                     addCategory(newCategory);

                 }

             });

         }

     }

     private void showNewCategoryWindow() {

         final VerticalPanel main = new VerticalPanel();

         final KSDropDown typesDropDown = new KSDropDown();

         createCategoryWindow = new KSLightBox();

         FlexTable layoutTable = new FlexTable();

         final KSTextBox nameTextBox = new KSTextBox();

         nameTextBox.setText(picker.getText());//+ enteredWord);

         layoutTable.setWidget(0, 0, new KSLabel("Category"));

         layoutTable.setWidget(0, 1, new KSLabel("Type"));

         layoutTable.setWidget(1, 0, nameTextBox);

         layoutTable.setWidget(1, 1, typesDropDown);

         SectionTitle sectionTitle = SectionTitle.generateH2Title("Create New Category");

         //KSThinTitleBar titleBar = new KSThinTitleBar("Create New Category");

         main.add(sectionTitle);

         main.add(layoutTable);

         loCatRpcServiceAsync.getLoCategoryTypes(new KSAsyncCallback<List<LoCategoryTypeInfo>>() {

             @Override

             public void handleFailure(Throwable caught) {

                 Window.alert("getLoCategoryTypes failed " + caught.getMessage());

             }

             @Override

             public void onSuccess(List<LoCategoryTypeInfo> result) {

                 final LOCategoryTypeInfoList list = new LOCategoryTypeInfoList(result);

                 typesDropDown.setListItems(list);

                 if (categoryTypeMap == null) {

                     loadCategoryTypes(result);

                 }

                 CreateLoCancelGroup buttonPanel = new CreateLoCancelGroup(new Callback<LoCancelEnum>() {

                     @Override

                     public void exec(LoCancelEnum result) {

                         switch (result) {

                             case CREATE:

                                 LoCategoryInfoHelper catHelper = new LoCategoryInfoHelper(new Data());

                                 catHelper.setName(nameTextBox.getText());

                                 catHelper.setState("active");

                                 catHelper.setLoRepository(repoKey);

                                 catHelper.setType(typesDropDown.getSelectedItem());

                                 loCatRpcServiceAsync.saveData(catHelper.getData(), new KSAsyncCallback<DataSaveResult>() {

                                     @Override

                                     public void handleFailure(Throwable caught) {

                                         Window.alert("Create LO Category failed: " + caught.getMessage());

                                     }

                                     @Override

                                     public void onSuccess(DataSaveResult result) {

                                         KSBlockingProgressIndicator.removeTask(saving);

                                         if (result.getValidationResults() != null && !result.getValidationResults().isEmpty()) {

                                             Window.alert("Create LO Category failed: " + result.getValidationResults().get(0).getMessage());

                                         } else {

                                             final LoCategoryInfo newCategory = CategoryDataUtil.toLoCategoryInfo(result.getValue());

                                             addCategory(newCategory);

                                             createCategoryWindow.hide();

                                             KSNotifier.add(new KSNotification("Create LO Category Successful", false, 3000));

                                         }

                                     }

                                 });

                                 break;

                             case CANCEL:

                                 createCategoryWindow.hide();

                                 break;

                         }

                     }

                 });

                 main.add(buttonPanel);

                 main.setPixelSize(300, 300);

                 createCategoryWindow.setWidget(main);

                 createCategoryWindow.show();

             }

         });

     }

     private void loadCategoryTypes(List<LoCategoryTypeInfo> categoryTypes) {

         if (categoryTypeMap == null) {

             categoryTypeMap = new HashMap<String, LoCategoryTypeInfo>();

         }

         if (categoryTypes != null) {

             for (LoCategoryTypeInfo i : categoryTypes) {

                 categoryTypeMap.put(i.getId(), i);

             }

         }

     }

     private void addCategory(final LoCategoryInfo category) {

         if (categoryTypeMap == null) {

             categoryTypeMap = new HashMap<String, LoCategoryTypeInfo>();

         }

         if (categoryTypeMap.containsKey(category.getType())) {

             categoryList.addItem(category);

             picker.reset();

         } else {

             loCatRpcServiceAsync.getLoCategoryType(category.getType(), new KSAsyncCallback<LoCategoryTypeInfo>() {

                 @Override

                 public void handleFailure(Throwable caught) {

                     Window.alert("getLoCategoryType failed " + caught.getMessage());

                 }

                 @Override

                 public void onSuccess(LoCategoryTypeInfo result) {

                     categoryTypeMap.put(result.getId(), result);

                     categoryList.addItem(category);

                     picker.reset();

                 }

             });

         }

     }

     private String getLabelText(String labelKey) {

         return Application.getApplicationContext().getUILabel(messageGroup, type, state, labelKey);

     }

     @Override

     public void setValue(List<LoCategoryInfo> categories) {

         categoryList.setValue(categories);

     }

     @Override

     public void setValue(List<LoCategoryInfo> value, boolean fireEvents) {

         setValue(value);

     }

     /**

      * @see com.google.gwt.user.client.ui.HasValue#getValue()

      */

     @Override

     public List<LoCategoryInfo> getValue() {

         return categoryList.getValue();

     }

     /**

      * @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler)

      */

     @Override

     public HandlerRegistration addValueChangeHandler(ValueChangeHandler<List<LoCategoryInfo>> handler) {

         return categoryList.addValueChangeHandler(handler);

     }

     /**

      * This class provides a suggest box for existing LO categories backed by a search on category name

      *

      * @author Kuali Rice Team (kuali-rice@googlegroups.com)

      */

     private class LOCategoryPicker extends Composite implements SuggestPicker {

         //FIXME:   [KSCOR-225] Class needs to be rewritten to use KSPicker instead of SuggestPicker and use lookup config through metadata

         final SearchSuggestOracle loSearchOracle = new SearchSuggestOracle(

                 "lo.search.loCategories",

                 "lo.queryParam.loOptionalCategoryName",

                 "lo.queryParam.loCategoryId",

                 "lo.resultColumn.categoryId",

                 "lo.resultColumn.categoryNameAndType");

         final KSSuggestBox suggestBox = new KSSuggestBox(loSearchOracle);

         private final FocusGroup focus = new FocusGroup(this);

         private VerticalPanel main = new VerticalPanel();

         protected LOCategoryPicker() {

             super();

             init();

         }

         public String getSelectedId() {

             return suggestBox.getSelectedId();

         }

         private void init() {

             focus.addWidget(suggestBox);

             loSearchOracle.setTextWidget(suggestBox.getTextBox());

             main.add(suggestBox);

             initWidget(main);

         }

         @Override

         public String getValue() {

             return suggestBox.getSelectedId();

         }

         @Override

         public void setValue(String value) {

             setValue(value, true);

         }

         @Override

         public void setValue(String value, boolean fireEvents) {

             suggestBox.reset();

             suggestBox.setValue(value, fireEvents);

         }

         @Override

         public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) {

             return suggestBox.addValueChangeHandler(handler);

         }

         @Override

         public void fireEvent(GwtEvent<?> event) {

             super.fireEvent(event);

         }

         public void reset() {

             suggestBox.reset();

         }

         @Override

         public HandlerRegistration addFocusHandler(FocusHandler handler) {

             return focus.addFocusHandler(handler);

         }

         @Override

         public HandlerRegistration addBlurHandler(BlurHandler handler) {

             return focus.addBlurHandler(handler);

         }

         public String getText() {

             return suggestBox.getText();

         }

         @Override

         public HandlerRegistration addSelectionChangeHandler(SelectionChangeHandler handler) {

             return suggestBox.addSelectionChangeHandler(handler);

         }

     }

     private class LOCategoryTypeInfoList implements ListItems {

         Map<String, LoCategoryTypeInfo> loTypeMap = new HashMap<String, LoCategoryTypeInfo>();

         public LOCategoryTypeInfoList(List<LoCategoryTypeInfo> loTypes) {

             for (LoCategoryTypeInfo type : loTypes) {

                 loTypeMap.put(type.getId(), type);

             }

         }

         public List<String> getAttrKeys() {

             return Arrays.asList("Name");

         }

         public String getItemAttribute(String id, String attrkey) {

             LoCategoryTypeInfo lo = loTypeMap.get(id);

             if (attrkey.equals("Name")) {

                 return lo.getName();

             }

             return null;

         }

         public int getItemCount() {

             return loTypeMap.size();

         }

         public List<String> getItemIds() {

             List<String> keys = new ArrayList<String>();

             for (String s : loTypeMap.keySet()) {

                 keys.add(s);

             }

             return keys;

         }

         public String getItemText(String id) {

             return ((LoCategoryTypeInfo) loTypeMap.get(id)).getName();

         }

     }

     public class LOCategoryListNew extends Composite implements HasValue<List<LoCategoryInfo>> {

         private static final String CATEGORY_TYPE_SEPARATOR = " - ";

         private VerticalPanel listPanel;

         private VerticalPanel main = new VerticalPanel();

         protected List<LoCategoryInfo> categories = new ArrayList<LoCategoryInfo>();

         final CloseHandler<KSItemLabel> deleteHandler = new CloseHandler<KSItemLabel>() {

             @Override

             public void onClose(CloseEvent<KSItemLabel> event) {

                 KSItemLabel itemLabel = event.getTarget();

                 String itemText = itemLabel.getDeletedKey();

                 categoryList.removeItem(itemText);

                 categoryList.redraw();

             }

         };

         public LOCategoryListNew() {

             listPanel = new VerticalPanel();

             main.add(listPanel);

             super.initWidget(main);

         }

         public HandlerRegistration addValueChangeHandler(ValueChangeHandler<List<LoCategoryInfo>> handler) {

             return addHandler(handler, ValueChangeEvent.getType());

         }

         private void fireChangeEvent() {

             ValueChangeEvent.fire(this, categories);

         }

         public void redraw() {

             if (null == categoryTypeMap || categoryTypeMap.isEmpty()) {

                 loCatRpcServiceAsync.getLoCategoryTypes(new KSAsyncCallback<List<LoCategoryTypeInfo>>() {

                     @Override

                     public void handleFailure(Throwable caught) {

                         Window.alert("getLoCategoryTypes failed " + caught.getMessage());

                     }

                     @Override

                     public void onSuccess(List<LoCategoryTypeInfo> result) {

                         if (categoryTypeMap == null) {

                             loadCategoryTypes(result);

                         }

                         redrawCategoryTable();

                     }

                 });

             } else {

                 redrawCategoryTable();

             }

         }

         private void redrawCategoryTable() {

             listPanel.clear();

             for (int i = 0; i < categories.size(); i++) {

                 String name = categories.get(i).getName();

                 String typeKey = categories.get(i).getType();

                 // TODO - need to somehow ensure that categoryTypeMap is initialized before redraw()

                 KSItemLabel newItemLabel = new KSItemLabel(true, new CategoryDataParser());

                 Data categoryData = CategoryDataUtil.toData(categories.get(i));

                 newItemLabel.setValue(new DataValue(categoryData));

                 newItemLabel.addCloseHandler(deleteHandler);

                 listPanel.add(newItemLabel);

 //               String name = categories.get(i).getName();

 //               String typeKey = categories.get(i).getType();

 //               // TODO - need to somehow ensure that categoryTypeMap is initialized before redraw() 

 //               String typeName = "ERROR: uninitialized categoryTypeMap";

 //               if (null != categoryTypeMap) {

 //                   typeName = categoryTypeMap.get(typeKey).getName();

 //               } 

 //               categoryTable.setWidget(row, col++, new KSLabel(name + CATEGORY_TYPE_SEPARATOR + typeName));

 //               KSLabel deleteLabel = new KSLabel("[x]");

 //               deleteLabel.addStyleName("KS-LOBuilder-Search-Link");

 //               deleteLabel.addClickHandler(deleteHandler);

 //               categoryTable.setWidget(row, col++, deleteLabel);

 //               row++;

 //               col = 0;                                

             }

         }

         public List<LoCategoryInfo> getValue() {

             return categories;

         }

         public void setValue(List<LoCategoryInfo> categories) {

             this.categories = categories;

             redraw();

         }

         @Override

         public void setValue(List<LoCategoryInfo> value, boolean fireEvents) {

             setValue(value);

         }

         public void removeItem(String text) {

             int a = text.indexOf(CATEGORY_TYPE_SEPARATOR);

             text = text.substring(0, a);

             int i = 0;

             for (LoCategoryInfo catInfo : categories) {

                 String name = catInfo.getName();

                 if (name.equals(text)) {

                     categories.remove(i);

                     fireChangeEvent();

                     break;

                 }

                 i++;

             }

             redraw();

         }

         public void addItem(LoCategoryInfo category) {

             categories.add(category);

             fireChangeEvent();

             redraw();

         }

     }

     public class CategoryDataParser implements DataHelper {

         public CategoryDataParser() {

         }

         ;

         @Override

         public String getKey(Data data) {

             return parse(data);

         }

         @Override

         public String parse(Data data) {

             String result = null;

             if (data != null) {

                 LoCategoryInfo loCategoryInfo = CategoryDataUtil.toLoCategoryInfo(data);

                 String typeName = "ERROR: uninitialized categoryTypeMap";

                 if (null != categoryTypeMap) {

                     typeName = categoryTypeMap.get(loCategoryInfo.getType()).getName();

                 }

                 result = loCategoryInfo.getName() +

                         LOCategoryBuilder.LOCategoryListNew.CATEGORY_TYPE_SEPARATOR + typeName;

             } else {

                 result = "";

             }

             return result;

         }

     }

     public class CreateLoCancelGroup extends ButtonGroup<LoCancelEnum> {

         public CreateLoCancelGroup(Callback<LoCancelEnum> callback) {

             layout = new ButtonRow();

             this.addCallback(callback);

             addButton(LoCancelEnum.CANCEL);

             addButtonToSecondaryGroup(LoCancelEnum.CREATE);

             this.initWidget(layout);

         }

         private void addButton(final LoCancelEnum type) {

             KSButton button = new KSButton(type.getText(), new ClickHandler() {

                 @Override

                 public void onClick(ClickEvent event) {

                     sendCallbacks(type);

                 }

             });

             layout.addButton(button);

             buttonMap.put(type, button);

         }

         private void addButtonToSecondaryGroup(final LoCancelEnum type) {

             KSButton button = new KSButton(type.getText(), new ClickHandler() {

                 @Override

                 public void onClick(ClickEvent event) {

                     sendCallbacks(type);

                 }

             });

             ((ButtonRow) layout).addButtonToSecondaryGroup(button);

             buttonMap.put(type, button);

         }

     }

     public static enum LoCancelEnum implements ButtonEnum {

         CREATE, CANCEL;

         @Override

         public ButtonEnum getActionType() {

             return CREATE;

         }

         @Override

         public ButtonEnum getCancelType() {

             return CANCEL;

         }

         @Override

         public ButtonStyle getStyle() {

             return ButtonStyle.PRIMARY;

         }

         @Override

         public String getText() {

             switch (this) {

                 case CREATE:

                     return "Create";

                 case CANCEL:

                     return "Cancel";

             }

             return null;

         }

     }

 }