/**
    * 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.lu.ui.tools.client.widgets;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Set;
  
  import org.kuali.student.common.ui.client.application.KSAsyncCallback;
  import org.kuali.student.common.ui.client.mvc.Callback;
  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.pagetable.GenericTableModel;
  import org.kuali.student.common.ui.client.widgets.pagetable.PagingScrollTableBuilder;
  import org.kuali.student.common.ui.client.widgets.searchtable.ResultRow;
  import org.kuali.student.common.ui.client.widgets.searchtable.SearchColumnDefinition;
  import org.kuali.student.r1.common.assembly.data.LookupResultMetadata;
  
  import com.google.gwt.gen2.table.client.AbstractColumnDefinition;
  import com.google.gwt.gen2.table.client.AbstractScrollTable.ResizePolicy;
  import com.google.gwt.gen2.table.client.SelectionGrid.SelectionPolicy;
  import com.google.gwt.gen2.table.client.PagingScrollTable;
  import com.google.gwt.gen2.table.event.client.RowSelectionHandler;
  import com.google.gwt.user.client.ui.Composite;
  import com.google.gwt.user.client.ui.Label;
  import com.google.gwt.user.client.ui.VerticalPanel;
  import org.kuali.student.r2.core.search.dto.SearchRequestInfo;
  import org.kuali.student.r2.core.search.dto.SearchResultCellInfo;
  import org.kuali.student.r2.core.search.dto.SearchResultInfo;
  import org.kuali.student.r2.core.search.dto.SearchResultRowInfo;
  
  public class SearchBackedTable extends Composite {
  
  	private final List<ResultRow> resultRows = new ArrayList<ResultRow>();
  	private final List<ResultRow> allResults = new ArrayList<ResultRow>();
  	private List<AbstractColumnDefinition<ResultRow, ?>> columnDefs = new ArrayList<AbstractColumnDefinition<ResultRow, ?>>();
  	private GenericTableModel<ResultRow> tableModel = new GenericTableModel<ResultRow>(
  			resultRows);
  	private PagingScrollTableBuilder<ResultRow> builder = new PagingScrollTableBuilder<ResultRow>();
  	private String resultIdColumnKey;
  	protected PagingScrollTable<ResultRow> pagingScrollTable;
  	private VerticalPanel layout = new VerticalPanel();
  
  	private SearchRpcServiceAsync searchRpcServiceAsync = SearchServiceFactory.getSearchService();
  	
  	private int defaultHeight = 200;
  
  	private SelectionPolicy selectionPolicy = SelectionPolicy.MULTI_ROW;
  	private String tableStyleName = "";
  
  	public SearchBackedTable() {
  		super();
  		redraw();
  		layout.setWidth("100%");
  		initWidget(layout);
  	}
  
  	public SearchBackedTable(int tableHeight) {
  		this();
  		this.defaultHeight = tableHeight;
  	}
  
  	public void clearTable() {
  		resultRows.clear();
  		this.redraw();
  	}
  
  	public void removeSelected() {
  		for (ResultRow r : getSelectedRows()) {
  			resultRows.remove(r);
  		}
  		this.redraw();
  	}
  	
  	public void performSearch(SearchRequestInfo searchRequest,
  			List<LookupResultMetadata> listResultMetadata, String resultIdKey,
  			final Callback<Boolean> callback) {
  
  		initializeTable(listResultMetadata, resultIdKey);
  
  		searchRequest.setNeededTotalResults(false);
  
  		if (pagingScrollTable != null) {
  			pagingScrollTable.setEmptyTableWidget(new Label(
  					"Processing Search..."));
  		}
 		
 		// Window.alert ("About to invoke asynch search...");
 		searchRpcServiceAsync.search(searchRequest,
 				new KSAsyncCallback<SearchResultInfo>() {
 
 					@Override
 					public void onSuccess(SearchResultInfo searchResults) {
 						// Window.alert ("Got back search results...");
 						resultRows.clear();
 						if (searchResults != null) {
 							for (SearchResultRowInfo searchResultRow : searchResults
 									.getRows()) {
 								// Window.alert ("adding row");
 								ResultRow resultRow = new ResultRow();
 								for (SearchResultCellInfo searchResultCell : searchResultRow
 										.getCells()) {
 									if (searchResultCell.getKey().equals(
 											resultIdColumnKey)) {
 										resultRow.setId(searchResultCell
 												.getValue());
 									}
 									resultRow.setValue(
 											searchResultCell.getKey(),
 											searchResultCell.getValue());
 								}
 								resultRows.add(resultRow);
 							}
 						}
 						// Window.alert ("about to redraw...");
 						allResults.addAll(resultRows);
 						redraw();
 						callback.exec(true);
 					}
 
 				});
 	}
 	
 	private void initializeTable(List<LookupResultMetadata> listResultMetadata,
 			String resultIdKey) {
 		clearTable();
 
 		this.resultIdColumnKey = resultIdKey;
 		builder = new PagingScrollTableBuilder<ResultRow>();
 		builder.tablePixelSize(900, defaultHeight); // width, height
 		builder.setSelectionPolicy(selectionPolicy);
 
 		columnDefs = new ArrayList<AbstractColumnDefinition<ResultRow, ?>>();
 		for (LookupResultMetadata r : listResultMetadata) {
 			// TODO: use this as a token to get a message from message service
 			// instead
 			String header = r.getName();
 			String key = r.getKey();
 			if (!r.isHidden()) {
 				columnDefs.add(new SearchColumnDefinition(header, key));
 			}
 		}
 		if (columnDefs.size() == 1) {
 			columnDefs.get(0).setMinimumColumnWidth(370);
 		}
 		builder.columnDefinitions(columnDefs);
 		tableModel.setColumnDefs(columnDefs);
 
 		redraw();
 	}
 
 	public void redraw() {
 		tableModel.setRows(resultRows);
 		pagingScrollTable = builder.build(tableModel);
 		pagingScrollTable.setResizePolicy(ResizePolicy.FILL_WIDTH);		
 		if(tableStyleName != "")
 			pagingScrollTable.setStyleName(tableStyleName);
 		layout.clear();
 		layout.add(pagingScrollTable);
 		pagingScrollTable.fillWidth();
 		pagingScrollTable.reloadPage();
 	}
 
 	public void addSelectionHandler(RowSelectionHandler selectionHandler) {
 		pagingScrollTable.getDataTable().addRowSelectionHandler(
 				selectionHandler);
 	}
 
 	public List<ResultRow> getSelectedRows() {
 		List<ResultRow> rows = new ArrayList<ResultRow>();
 		Set<Integer> selectedRows = pagingScrollTable.getDataTable()
 				.getSelectedRows();
 		for (Integer i : selectedRows) {
 			rows.add(pagingScrollTable.getRowValue(i));
 		}
 		return rows;
 	}
 
 	public List<String> getSelectedIds() {
 		List<String> ids = new ArrayList<String>();
 		Set<Integer> selectedRows = pagingScrollTable.getDataTable()
 				.getSelectedRows();
 		for (Integer i : selectedRows) {
 			ids.add(pagingScrollTable.getRowValue(i).getId());
 		}
 		return ids;
 	}
 
 	public List<String> getAllIds() {
 		List<String> ids = new ArrayList<String>();
 		for (ResultRow r : resultRows) {
 			ids.add(r.getId());
 		}
 		return ids;
 	}
 
 	public List<ResultRow> getAllRows() {
 		List<ResultRow> rows = new ArrayList<ResultRow>();
 		for (ResultRow r : resultRows) {
 			rows.add(r);
 		}
 		return rows;
 	}
 
 	public List<ResultRow> getAllResults() {
 		return allResults;
 	}
 
 	public List<ResultRow> getResultRows() {
 		return resultRows;
 	}
 
 	public void setDefaultHeight(int defaultHeight) {
 		this.defaultHeight = defaultHeight;
 	}
 
     public void setSelectionPolicy(SelectionPolicy selectionPolicy){
     	this.selectionPolicy = selectionPolicy;
     }
 
     public void setTableStyleName(String tableStyleName){
     	this.tableStyleName = tableStyleName;
     }
 }