/**

  * 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.common.ui.client.widgets.suggestbox;

 import java.util.ArrayList;

 import java.util.List;

 import org.kuali.student.common.ui.client.application.KSAsyncCallback;

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

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

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

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

 import org.kuali.student.common.ui.client.widgets.notification.LoadingDiv;

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

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

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

 import org.kuali.student.core.search.dto.SearchParam;

 import org.kuali.student.core.search.dto.SearchRequest;

 import org.kuali.student.core.search.dto.SearchResult;

 import org.kuali.student.core.search.dto.SearchResultCell;

 import org.kuali.student.core.search.dto.SearchResultRow;

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

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

 import com.google.gwt.user.client.ui.PopupPanel.PositionCallback;

 public class SearchSuggestOracle extends IdableSuggestOracle{

     private String searchTypeKey;

     private String searchIdKey;

     private String searchTextKey;

     private String resultIdKey;

     private Callback currentCallback;

     private Request pendingRequest;

     private Callback pendingCallback;

     private HasText textWidget;

     private String resultDisplayKey;

     private String resultSortKey;

     private List<SearchParam> additionalParams = new ArrayList<SearchParam>();

     private List<IdableSuggestion> lastSuggestions = new ArrayList<IdableSuggestion>();

     private LookupMetadata lookupMetaData;

     private CachingSearchService cachingSearchService = CachingSearchService.getSearchService();

     private SearchRpcServiceAsync searchService = SearchServiceFactory.getSearchService();

     private List<org.kuali.student.common.ui.client.mvc.Callback<IdableSuggestion>> searchCompletedCallbacks = new ArrayList<org.kuali.student.common.ui.client.mvc.Callback<IdableSuggestion>>();

     private LoadingDiv loading = new LoadingDiv();

     /**

      * @deprecated

      * @param searchTypeKey the type to be search on

      * @param searchTextKey the column/key that to search on

      * @param idKey the column/key that is the primary key for this type

      */

     public SearchSuggestOracle(String searchTypeKey, String searchTextKey, String searchIdKey, String resultIdKey, String resultDisplayKey){

         this.searchTypeKey = searchTypeKey;

         this.searchTextKey = searchTextKey;

         this.searchIdKey = searchIdKey;

         this.resultIdKey = resultIdKey;

         this.resultDisplayKey = resultDisplayKey;

     }

     /*

      * 

      */

     public SearchSuggestOracle(LookupMetadata lookupMetadata) {

             this.lookupMetaData = lookupMetadata;

         this.searchTypeKey = lookupMetaData.getSearchTypeId();

         for (LookupParamMetadata param : lookupMetadata.getParams()) {

                 if ((param.getUsage() != null) && param.getUsage().name().equals("DEFAULT")) {

                         this.searchTextKey = param.getKey();

                 }

                 //Add in any writeaccess never default values to the additional params

                 if(WriteAccess.NEVER.equals(param.getWriteAccess())||param.getDefaultValueString()!=null||param.getDefaultValueList()!=null){

                         SearchParam searchParam = new SearchParam();

                         searchParam.setKey(param.getKey());

                                 if(param.getDefaultValueList()==null){

                                         searchParam.setValue(param.getDefaultValueString());

                                 }else{

                                         searchParam.setValue(param.getDefaultValueList());

                                 }

                         additionalParams.add(searchParam);

                 }

         }

         if (this.searchTextKey == null) {

                 KSErrorDialog.show(new Throwable("Cannot find searchTextKey for " + searchTypeKey) );

         }

         this.searchIdKey = lookupMetadata.getSearchParamIdKey();

         this.resultIdKey = lookupMetadata.getResultReturnKey();

         this.resultDisplayKey = lookupMetadata.getResultDisplayKey();

         this.resultSortKey = lookupMetadata.getResultSortKey();

     }

     public void setAdditionalSearchParams(List<SearchParam> params){

         additionalParams = params;

     }

     private Callback wrappedCallback = new Callback() {

         public void onSuggestionsReady(Request request, Response response) {

           if (textWidget.getText().equals(request.getQuery())) {

             currentCallback.onSuggestionsReady(request, response);

             pendingRequest = null;

             pendingCallback = null;

           }

           currentCallback = null;

           if (pendingCallback != null) {

             requestSuggestions(pendingRequest, pendingCallback);

             pendingRequest = null;

             pendingCallback = null;

           }

         }

     };

     @Override

     public void requestSuggestions(Request request, Callback callback) {

         if (currentCallback == null) {

           final int x = ((Widget)this.textWidget).getAbsoluteLeft() + ((Widget)this.textWidget).getOffsetWidth();

                     final int y = ((Widget)this.textWidget).getAbsoluteTop() + ((Widget)this.textWidget).getOffsetHeight();

                     loading.setPopupPositionAndShow(new PositionCallback(){

                                   @Override

                                   public void setPosition(int offsetWidth, int offsetHeight) {

                                           loading.setPopupPosition(x - offsetWidth, y + 1);

                                   }

                           });

           currentCallback = callback;

           sendRequest(request, wrappedCallback);

         } else {

           pendingRequest = request;

           pendingCallback = callback;

         }        

     }

     private SearchRequest buildSearchRequest(String query, String searchId) {

             SearchRequest sr = new SearchRequest();

             sr.setNeededTotalResults(false);

             sr.setSearchKey(this.searchTypeKey);

             sr.setSortColumn(this.resultSortKey);

                 List<SearchParam> searchParams = new ArrayList<SearchParam>();

                 SearchParam param1 = createParam(this.searchTextKey, query);

                 searchParams.add(param1);

             sr.setParams(searchParams);

             sr.getParams().addAll(additionalParams);

         return sr;

     }

     private SearchRequest buildSearchRequestById(String query, String searchId) {

             SearchRequest sr = new SearchRequest();

             sr.setNeededTotalResults(false);

             sr.setSearchKey(this.searchTypeKey);

             sr.setSortColumn(this.resultSortKey);

                 List<SearchParam> searchParams = new ArrayList<SearchParam>();

                 SearchParam param2 = createParam(this.searchIdKey, searchId);

                 searchParams.add(param2);

             sr.setParams(searchParams);

             sr.getParams().addAll(additionalParams);

         return sr;

     }

     private SearchParam createParam(String key, String value) {

             SearchParam param = new SearchParam();

             if(key == null) {

                         param.setKey("");

                 } else {

                         param.setKey(key);

                 }

             if(value == null) {

                         param.setValue("");

                 } else {

                         param.setValue(value);

                 }

             return param;

     }

     public void sendRequest(final Request request, final Callback callback){

         String query = request.getQuery().trim();

         SearchRequest searchRequest = buildSearchRequest(query, null);

         //case-sensitive?

         if(query.length() > 0){

                 searchService.search(searchRequest, new KSAsyncCallback<SearchResult>(){

                 @Override

                 public void onSuccess(SearchResult results) {

                     lastSuggestions = createSuggestions(results, request.getLimit());

                     Response response = new Response(lastSuggestions);

                     loading.hide();

                     callback.onSuggestionsReady(request, response);

                     if (searchCompletedCallbacks != null &&

                             lastSuggestions != null && lastSuggestions.size() == 1) {

                         for (org.kuali.student.common.ui.client.mvc.Callback<IdableSuggestion> callback : searchCompletedCallbacks) {

                             callback.exec(lastSuggestions.get(0));

                         }

                     }

                 }

                 @Override

                 public void onFailure(Throwable caught) {

                         loading.hide();

                         super.onFailure(caught);

                 }

                 private List<IdableSuggestion> createSuggestions(SearchResult results, int limit){

                     List<IdableSuggestion> suggestionsList = new ArrayList<IdableSuggestion>();

                     String query = request.getQuery();

                     query = query.trim();

                     int count = 0;

                     if(results != null){

                         for (SearchResultRow r: results.getRows()){

                             if(count == limit){

                                 break;

                             }

                             IdableSuggestion theSuggestion = new IdableSuggestion();

                             for(SearchResultCell c: r.getCells()){

                                 if(c.getKey().equals(resultDisplayKey)){

                                     String itemText = c.getValue();

                                     theSuggestion.addAttr(c.getKey(), c.getValue());

                                     int index = (" " + itemText).toLowerCase().indexOf(" " + query.toLowerCase().trim());

                                     if (index < 0) {

                                         //temporary fix to stop index out of bound exception in hosted mode

 //                                        continue;

                                         //Including fuzzy search results in the display list.

                                         theSuggestion.setDisplayString(itemText);

                                         theSuggestion.setReplacementString(itemText);

                                             //FIXME handle case when search for text is not appearing within search result - should not happen (misconfiguration)

                                         continue;

                                     }

                                     String htmlString = itemText.substring(0,index) + "<b>" + itemText.substring(index, index + query.length()) + "</b>" + itemText.substring(index + query.length(), itemText.length());

                                     theSuggestion.setDisplayString(htmlString);

                                     theSuggestion.setReplacementString(itemText);

                                 } else if(c.getKey().equals(resultIdKey)){

                                      theSuggestion.setId(c.getValue());

                                      theSuggestion.addAttr(c.getKey(), c.getValue());

                                 } else{

                                     theSuggestion.addAttr(c.getKey(), c.getValue());

                                 }

                             }

                             suggestionsList.add(theSuggestion);

                             count++;

                         }

                     }

                     return suggestionsList;

                 }

             });

         }

     }

     @Override

     public boolean isDisplayStringHTML() {

         return true;

     }

 /*    

     public IdableSuggestion getSuggestionById(String id) {

         IdableSuggestion suggestion = null;

         if(!(lastSuggestions.isEmpty())){

             for(IdableSuggestion is: lastSuggestions){

                 if(is.getId().equals(id)){

                     suggestion = is;

                     break;

                 }

             }

         }

         if(suggestion == null){

             searchOnId(id);

         }

         return suggestion;

     }*/

     @Override

     public IdableSuggestion getSuggestionByText(String text){

         IdableSuggestion suggestion = null;

         for(IdableSuggestion is: lastSuggestions){

             if(is.getReplacementString().trim().equalsIgnoreCase(text.trim())){

                 suggestion = is;

                 break;

             }

         }

         return suggestion;

     }

     public void setTextWidget(HasText widget){

         textWidget = widget;

     }

     @Override

     public void getSuggestionByIdSearch(String id, final org.kuali.student.common.ui.client.mvc.Callback<IdableSuggestion> callback) {

         SearchRequest searchRequest = buildSearchRequestById(null, id);

         cachingSearchService.search(searchRequest, new KSAsyncCallback<SearchResult>(){

             @Override

             public void onSuccess(SearchResult results) {

                 IdableSuggestion theSuggestion = null;

                 if(results != null && !results.getRows().isEmpty()){

                         SearchResultRow r = results.getRows().get(0);

                     theSuggestion = new IdableSuggestion();

                     for(SearchResultCell c: r.getCells()){

                         if(c.getKey().equals(resultDisplayKey)){

                             String itemText = c.getValue();

                             theSuggestion.addAttr(c.getKey(), c.getValue());

                             theSuggestion.setDisplayString(itemText);

                             theSuggestion.setReplacementString(itemText);

                         } else if(c.getKey().equals(resultIdKey)){

                              theSuggestion.setId(c.getValue());

                              theSuggestion.addAttr(c.getKey(), c.getValue());

                         } else {

                             theSuggestion.addAttr(c.getKey(), c.getValue());

                         }

                     }

                 }

                 callback.exec(theSuggestion);

             }

         });

     }

     @Override

     public void addSearchCompletedCallback(org.kuali.student.common.ui.client.mvc.Callback<IdableSuggestion> callback) {

         searchCompletedCallbacks.add(callback);

     }

 }