package test.order;

import java.util.ArrayList;
import java.util.List;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.event.DropEvent;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zk.ui.util.GenericAutowireComposer;
import org.zkoss.zul.Button;
import org.zkoss.zul.Column;
import org.zkoss.zul.Columns;
import org.zkoss.zul.Grid;
import org.zkoss.zul.Intbox;

public class TableViewerComposer extends GenericAutowireComposer /* extends AbstractSASViewerComposer */ {
   
//   protected static Logger logger = Logger.getLogger(TableViewerComposer.class);

   private Grid tableViewerGrid;
   private ScrollingListModel model;
   private List<ColumnDescriptor> colInfos;
   private ArrayList<Integer> columnOrder;
   private final int FIXED_COL_SIZE = 1;
   
   private Intbox gdRowIntbox;
   private Button gdLastRowBtn;
   private Button gdFirstRowBtn;

   public void doBeforeComposeChildren(Component comp) throws Exception {
      super.doBeforeComposeChildren(comp);
      // comp.setAttribute("model", model);
      // comp.setAttribute("renderer", new TableViewerRowRenderer());
   }

   public void doAfterCompose(Component win) throws Exception {
      super.doAfterCompose(win);
      model = new ScrollingListModel();
      this.colInfos = model.getColInfos();
      this.columnOrder = new ArrayList<Integer>(colInfos.size() - FIXED_COL_SIZE);
      final Columns cols = tableViewerGrid.getColumns();
      
      // Column for row position
      Column posCol = new Column();
      posCol.setHflex("min");
      //String rowNumLabel = t(colInfo.get(0).getLabel()); // �bersetzen.
      // TODO 
      String rowNumLabel = "Lfd.Nr.";
      posCol.setLabel(rowNumLabel);
      posCol.setParent(cols);
      
      // Data cols
      for (int i = 0; i < colInfos.size(); i++) {
         ColumnDescriptor colInfo = (ColumnDescriptor) colInfos.get(i);
         final Column col = new Column();
         columnOrder.add(i);
         
         // Drag & Drop
         col.setDraggable("" + i);
         col.setDroppable("true");
         col.addEventListener(Events.ON_DROP, new EventListener() {
            public void onEvent(Event event) throws Exception {
               DropEvent dropEvent = (DropEvent) event;
               Component dragged = dropEvent.getDragged();
               
               int from = cols.getChildren().indexOf(dragged);
               int to = cols.getChildren().indexOf(col);
               
               Component toObject = (Component) cols.getChildren().get(to);
               dragged.setParent(null);
               if (to > from) {
                cols.insertBefore(dragged, toObject.getNextSibling());
               } else {
                cols.insertBefore(dragged, toObject);
               }
               
               resetColumnOrder();
               model.setColOrder(columnOrder);
               tableViewerGrid.setModel(model);
//               tableViewerGrid.invalidate();
            }
         });

         col.setHflex("min");
         col.setLabel(colInfo.getLabel());
         cols.appendChild(col);
      }
      
      model.setColOrder(columnOrder);
      tableViewerGrid.setModel(model);
      tableViewerGrid.setRowRenderer(new TableViewerRowRenderer());
      
      /* Events */
      gdRowIntbox.addEventListener(Events.ON_OK, new EventListener() {
         public void onEvent(Event event) throws Exception {
            Clients.evalJavaScript("scrollGridInto('" + tableViewerGrid.getUuid() + "',"
                     + getGridTopPosition(gdRowIntbox.getValue() - 1) + ")");
         }
      });

      gdFirstRowBtn.addEventListener(Events.ON_CLICK, new EventListener() {
         public void onEvent(Event event) throws Exception {
            Clients.evalJavaScript("scrollGridInto('" + tableViewerGrid.getUuid() + "',"
                     + getGridTopPosition(0) + ")");
         }
      });

      gdLastRowBtn.addEventListener(Events.ON_CLICK, new EventListener() {
         public void onEvent(Event event) throws Exception {
            Clients.evalJavaScript("scrollGridInto('" + tableViewerGrid.getUuid() + "',"
                     + getGridTopPosition(model.getSize() - 1) + ")");
         }
      });
   }

   private int getGridTopPosition(int rowIndex) {
      return rowIndex * 22;//assume row height is 22px;
   }
   
   private void resetColumnOrder() {
      @SuppressWarnings("unchecked")
      List<Component> cols = tableViewerGrid.getColumns().getChildren();
      columnOrder = new ArrayList<Integer>();
      for (Component c : cols) {
    	 Column col = (Column)c;
         if (col.getDraggable().equals("false")) {
            // fixe Spalte
         } else {
            columnOrder.add(Integer.parseInt(col.getDraggable()));
         }
      }
   }
}