/**

  * 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.search;

 import java.util.ArrayList;

 import java.util.List;

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

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

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

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

 import org.kuali.student.common.ui.client.widgets.searchtable.ResultRow;

 import org.kuali.student.common.ui.client.widgets.table.scroll.Column;

 import org.kuali.student.common.ui.client.widgets.table.scroll.DefaultTableModel;

 import org.kuali.student.common.ui.client.widgets.table.scroll.RetrieveAdditionalDataHandler;

 import org.kuali.student.common.ui.client.widgets.table.scroll.Row;

 import org.kuali.student.common.ui.client.widgets.table.scroll.RowComparator;

 import org.kuali.student.common.ui.client.widgets.table.scroll.Table;

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

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

 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.core.client.GWT;

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

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

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

 public class SearchResultsTable extends Composite{

     private final int PAGE_SIZE = 10;

     private SearchRpcServiceAsync searchRpcServiceAsync = GWT.create(SearchRpcService.class);

     private VerticalPanel layout = new VerticalPanel();

     private DefaultTableModel tableModel;

     private String resultIdColumnKey;

     private SearchRequest searchRequest;

     private Table table = new Table();

     private boolean isMultiSelect = true;

     public SearchResultsTable(){

         super();

         redraw();

         layout.setWidth("100%");

         initWidget(layout);

     }

     public void redraw(){

         layout.clear();      

     }

     public void setMutipleSelect(boolean isMultiSelect){

             this.isMultiSelect = isMultiSelect;

     }

     //FIXME do we really need to recreate the table for every refresh?

     public void initializeTable(List<LookupResultMetadata> listResultMetadata, String resultIdKey){ 

             table = new Table();

         this.resultIdColumnKey = resultIdKey;

         tableModel = new DefaultTableModel();

         tableModel.setMultipleSelectable(isMultiSelect);

         //create table heading

         for (LookupResultMetadata r: listResultMetadata){

             if(!r.isHidden()){

                 Column col1 = new Column();

                 col1.setId(r.getKey());

                 String header = Application.getApplicationContext().getUILabel("", null, null, r.getName());

                 col1.setName(header);

                 col1.setId(r.getKey());

                 col1.setWidth("100px");                    

                 col1.setAscendingRowComparator(new FieldAscendingRowComparator(r.getKey(), r.getDataType()));

                 col1.setDescendingRowComparator(new FieldDescendingRowComparator(r.getKey(), r.getDataType()));                

                 tableModel.addColumn(col1);

             }

         }      

      // TODO - there's a better way to do this

         if (this.searchRequest.getSearchKey().toLowerCase().contains("cross")) {

                 tableModel.setMoreData(false);

         }

         if(isMultiSelect){

                 tableModel.installCheckBoxRowHeaderColumn();

         }

         table.getScrollPanel().setHeight("300px");

         table.setTableModel(tableModel);

         table.addRetrieveAdditionalDataHandler(new RetrieveAdditionalDataHandler(){

                         @Override

                         public void onAdditionalDataRequest() {

                                  performOnDemandSearch(tableModel.getRowCount(), PAGE_SIZE);

                  //tableModel.fireTableDataChanged();

                         }

                 });

         redraw();

         layout.add(table);

   }   

     public void performSearch(SearchRequest searchRequest, List<LookupResultMetadata> listResultMetadata, String resultIdKey, boolean pagedResults){

         this.searchRequest = searchRequest;

         initializeTable(listResultMetadata, resultIdKey);

         if (this.searchRequest.getSearchKey().toLowerCase().contains("cross")) {

             //FIXME Do we still need this if condition?

             // Added an else to the if(pagedResults) line to prevent searches being executed

             // twice if the search name includes cross

             performOnDemandSearch(0, 0);

         }

         else if(pagedResults){

                 performOnDemandSearch(0, PAGE_SIZE);

         }

         else{

                 performOnDemandSearch(0, 0);

         }

     }    

     public void performSearch(SearchRequest searchRequest, List<LookupResultMetadata> listResultMetadata, String resultIdKey){

         this.performSearch(searchRequest, listResultMetadata, resultIdKey, true);

     }    

     private void performOnDemandSearch(int startAt, int size) {

             table.displayLoading(true);

         searchRequest.setStartAt(startAt);

         if (size != 0) {

                 searchRequest.setNeededTotalResults(false);

                 searchRequest.setMaxResults(size);

         } else {

                 searchRequest.setNeededTotalResults(true);

         }

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

             @Override

             public void handleFailure(Throwable cause) {

                 GWT.log("Failed to perform search", cause); //FIXME more detail info here

                 Window.alert("Failed to perform search");

                 table.displayLoading(false);

             }

             @Override

             public void onSuccess(SearchResult results) {

                 if(results != null && results.getRows() != null && results.getRows().size() != 0){

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

                         ResultRow theRow = new ResultRow();

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

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

                                 theRow.setId(c.getValue());

                             }

                             theRow.setValue(c.getKey(), c.getValue());

                         }

                        tableModel.addRow(new SearchResultsRow(theRow));

                     }

                 } else {

                         tableModel.setMoreData(false);

                 }

                 tableModel.fireTableDataChanged();

                 table.displayLoading(false);

             }

         });

     }

     public List<ResultRow> getSelectedRows(){

         List<ResultRow> rows = new ArrayList<ResultRow>();

         for(Row row : tableModel.getSelectedRows()){

             rows.add(((SearchResultsRow)row).getResultRow());

         }

         return rows;

     }

     public List<String> getSelectedIds(){

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

         for(Row row : tableModel.getSelectedRows()){

             ids.add(((SearchResultsRow)row).getResultRow().getId());

         }                

         return ids;

     }        

 }

 class SearchResultsRow extends Row {

     ResultRow row;

     public SearchResultsRow(ResultRow row){

        this.row = row;

     }

     @Override

     public Object getCellData(String columnId) {

         return row.getValue(columnId);        

     }

     @Override

     public void setCellData(String columnId, Object newValue) {

         row.setValue(columnId, newValue.toString());

     }

     @Override

     public String toString(){

         return row.toString();

     }

     public ResultRow getResultRow() {

         return row;

     }

 }   

 class FieldAscendingRowComparator extends RowComparator{

     String columnId;

     DataType type;

     FieldAscendingRowComparator(String columnId, DataType type) {

         this.columnId = columnId;

         this.type = type;

     }

     @Override

     public int compare(Row row0, Row row1) {

         String id0, id1;

         if (type.equals(DataType.STRING)) {

             id0 = (String)row0.getCellData(columnId);

             id1 = (String)row1.getCellData(columnId);

         } else {

             id0 = (String)row0.getCellData(columnId);

             id1 = (String)row1.getCellData(columnId);            

         }

         return id0.compareTo(id1);

     }    

 }

 class FieldDescendingRowComparator extends RowComparator{

     String columnId;

     DataType type;    

     FieldDescendingRowComparator(String columnId, DataType type) {

         this.columnId = columnId;

         this.type = type;        

     }    

     @Override

     public int compare(Row row0, Row row1) {

         String id0, id1;

         if (type.equals(DataType.STRING)) {

             id0 = (String)row0.getCellData(columnId);

             id1 = (String)row1.getCellData(columnId);

         } else {

             id0 = (String)row0.getCellData(columnId);

             id1 = (String)row1.getCellData(columnId);            

         }

         return id1.compareTo(id0);

     }    

 }