/*
    * Copyright 2000-2013 Vaadin Ltd.
    * 
    * Licensed under the Apache 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.apache.org/licenses/LICENSE-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 com.vaadin.client.ui.table;
  
  import java.util.Iterator;
  
  import com.google.gwt.core.client.Scheduler;
  import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  import com.google.gwt.dom.client.Element;
  import com.google.gwt.dom.client.Style.Position;
  import com.google.gwt.user.client.Command;
  import com.google.gwt.user.client.ui.Widget;
  import com.vaadin.client.ApplicationConnection;
  import com.vaadin.client.BrowserInfo;
  import com.vaadin.client.ComponentConnector;
  import com.vaadin.client.ConnectorHierarchyChangeEvent;
  import com.vaadin.client.DirectionalManagedLayout;
  import com.vaadin.client.Paintable;
  import com.vaadin.client.ServerConnector;
  import com.vaadin.client.TooltipInfo;
  import com.vaadin.client.UIDL;
  import com.vaadin.client.Util;
  import com.vaadin.client.ui.AbstractHasComponentsConnector;
  import com.vaadin.client.ui.PostLayoutListener;
  import com.vaadin.client.ui.VScrollTable;
  import com.vaadin.client.ui.VScrollTable.ContextMenuDetails;
  import com.vaadin.client.ui.VScrollTable.VScrollTableBody.VScrollTableRow;
  import com.vaadin.shared.ui.Connect;
  import com.vaadin.shared.ui.table.TableConstants;
  import com.vaadin.shared.ui.table.TableState;
  
  @Connect(com.vaadin.ui.Table.class)
  public class TableConnector extends AbstractHasComponentsConnector implements
          Paintable, DirectionalManagedLayout, PostLayoutListener {
  
      @Override
      protected void init() {
          super.init();
          getWidget().init(getConnection());
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see com.vaadin.client.Paintable#updateFromUIDL(com.vaadin.client.UIDL,
       * com.vaadin.client.ApplicationConnection)
       */
      @Override
      public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
          getWidget().rendering = true;
  
          // If a row has an open context menu, it will be closed as the row is
          // detached. Retain a reference here so we can restore the menu if
          // required.
          ContextMenuDetails contextMenuBeforeUpdate = getWidget().contextMenu;
  
          if (uidl.hasAttribute(TableConstants.ATTRIBUTE_PAGEBUFFER_FIRST)) {
              getWidget().serverCacheFirst = uidl
                      .getIntAttribute(TableConstants.ATTRIBUTE_PAGEBUFFER_FIRST);
              getWidget().serverCacheLast = uidl
                      .getIntAttribute(TableConstants.ATTRIBUTE_PAGEBUFFER_LAST);
          } else {
              getWidget().serverCacheFirst = -1;
              getWidget().serverCacheLast = -1;
          }
          /*
           * We need to do this before updateComponent since updateComponent calls
           * this.setHeight() which will calculate a new body height depending on
           * the space available.
           */
          if (uidl.hasAttribute("colfooters")) {
              getWidget().showColFooters = uidl.getBooleanAttribute("colfooters");
          }
  
          getWidget().tFoot.setVisible(getWidget().showColFooters);
  
          if (!isRealUpdate(uidl)) {
              getWidget().rendering = false;
              return;
          }
  
          getWidget().enabled = isEnabled();
  
          if (BrowserInfo.get().isIE8() && !getWidget().enabled) {
              /*
               * The disabled shim will not cover the table body if it is relative
              * in IE8. See #7324
              */
             getWidget().scrollBodyPanel.getElement().getStyle()
                     .setPosition(Position.STATIC);
         } else if (BrowserInfo.get().isIE8()) {
             getWidget().scrollBodyPanel.getElement().getStyle()
                     .setPosition(Position.RELATIVE);
         }
 
         getWidget().paintableId = uidl.getStringAttribute("id");
         getWidget().immediate = getState().immediate;
 
         int previousTotalRows = getWidget().totalRows;
         getWidget().updateTotalRows(uidl);
         boolean totalRowsChanged = (getWidget().totalRows != previousTotalRows);
 
         getWidget().updateDragMode(uidl);
 
         getWidget().updateSelectionProperties(uidl, getState(), isReadOnly());
 
         if (uidl.hasAttribute("alb")) {
             getWidget().bodyActionKeys = uidl.getStringArrayAttribute("alb");
         } else {
             // Need to clear the actions if the action handlers have been
             // removed
             getWidget().bodyActionKeys = null;
         }
 
         getWidget().setCacheRateFromUIDL(uidl);
 
         getWidget().recalcWidths = uidl.hasAttribute("recalcWidths");
         if (getWidget().recalcWidths) {
             getWidget().tHead.clear();
             getWidget().tFoot.clear();
         }
 
         getWidget().updatePageLength(uidl);
 
         getWidget().updateFirstVisibleAndScrollIfNeeded(uidl);
 
         getWidget().showRowHeaders = uidl.getBooleanAttribute("rowheaders");
         getWidget().showColHeaders = uidl.getBooleanAttribute("colheaders");
 
         getWidget().updateSortingProperties(uidl);
 
         boolean keyboardSelectionOverRowFetchInProgress = getWidget()
                 .selectSelectedRows(uidl);
 
         getWidget().updateActionMap(uidl);
 
         getWidget().updateColumnProperties(uidl);
 
         UIDL ac = uidl.getChildByTagName("-ac");
         if (ac == null) {
             if (getWidget().dropHandler != null) {
                 // remove dropHandler if not present anymore
                 getWidget().dropHandler = null;
             }
         } else {
             if (getWidget().dropHandler == null) {
                 getWidget().dropHandler = getWidget().new VScrollTableDropHandler();
             }
             getWidget().dropHandler.updateAcceptRules(ac);
         }
 
         UIDL partialRowAdditions = uidl.getChildByTagName("prows");
         UIDL partialRowUpdates = uidl.getChildByTagName("urows");
         if (partialRowUpdates != null || partialRowAdditions != null) {
             getWidget().postponeSanityCheckForLastRendered = true;
             // we may have pending cache row fetch, cancel it. See #2136
             getWidget().rowRequestHandler.cancel();
 
             getWidget().updateRowsInBody(partialRowUpdates);
             getWidget().addAndRemoveRows(partialRowAdditions);
 
             // sanity check (in case the value has slipped beyond the total
             // amount of rows)
             getWidget().scrollBody.setLastRendered(getWidget().scrollBody
                     .getLastRendered());
             getWidget().updateMaxIndent();
         } else {
             getWidget().postponeSanityCheckForLastRendered = false;
             UIDL rowData = uidl.getChildByTagName("rows");
             if (rowData != null) {
                 // we may have pending cache row fetch, cancel it. See #2136
                 getWidget().rowRequestHandler.cancel();
 
                 if (!getWidget().recalcWidths
                         && getWidget().initializedAndAttached) {
                     getWidget().updateBody(rowData,
                             uidl.getIntAttribute("firstrow"),
                             uidl.getIntAttribute("rows"));
                     if (getWidget().headerChangedDuringUpdate) {
                         getWidget().triggerLazyColumnAdjustment(true);
                     } else if (!getWidget().isScrollPositionVisible()
                             || totalRowsChanged
                             || getWidget().lastRenderedHeight != getWidget().scrollBody
                                     .getOffsetHeight()) {
                         // webkits may still bug with their disturbing scrollbar
                         // bug, see #3457
                         // Run overflow fix for the scrollable area
                         // #6698 - If there's a scroll going on, don't abort it
                         // by changing overflows as the length of the contents
                         // *shouldn't* have changed (unless the number of rows
                         // or the height of the widget has also changed)
                         Scheduler.get().scheduleDeferred(new Command() {
                             @Override
                             public void execute() {
                                 Util.runWebkitOverflowAutoFix(getWidget().scrollBodyPanel
                                         .getElement());
                             }
                         });
                     }
                 } else {
                     getWidget().initializeRows(uidl, rowData);
                 }
             }
         }
 
         // If a row had an open context menu before the update, and after the
         // update there's a row with the same key as that row, restore the
         // context menu. See #8526.
         showSavedContextMenu(contextMenuBeforeUpdate);
 
         if (!getWidget().isSelectable()) {
             getWidget().scrollBody.addStyleName(getWidget()
                     .getStylePrimaryName() + "-body-noselection");
         } else {
             getWidget().scrollBody.removeStyleName(getWidget()
                     .getStylePrimaryName() + "-body-noselection");
         }
 
         getWidget().hideScrollPositionAnnotation();
 
         // selection is no in sync with server, avoid excessive server visits by
         // clearing to flag used during the normal operation
         if (!keyboardSelectionOverRowFetchInProgress) {
             getWidget().selectionChanged = false;
         }
 
         /*
          * This is called when the Home or page up button has been pressed in
          * selectable mode and the next selected row was not yet rendered in the
          * client
          */
         if (getWidget().selectFirstItemInNextRender
                 || getWidget().focusFirstItemInNextRender) {
             getWidget().selectFirstRenderedRowInViewPort(
                     getWidget().focusFirstItemInNextRender);
             getWidget().selectFirstItemInNextRender = getWidget().focusFirstItemInNextRender = false;
         }
 
         /*
          * This is called when the page down or end button has been pressed in
          * selectable mode and the next selected row was not yet rendered in the
          * client
          */
         if (getWidget().selectLastItemInNextRender
                 || getWidget().focusLastItemInNextRender) {
             getWidget().selectLastRenderedRowInViewPort(
                     getWidget().focusLastItemInNextRender);
             getWidget().selectLastItemInNextRender = getWidget().focusLastItemInNextRender = false;
         }
         getWidget().multiselectPending = false;
 
         if (getWidget().focusedRow != null) {
             if (!getWidget().focusedRow.isAttached()
                     && !getWidget().rowRequestHandler.isRunning()) {
                 // focused row has been orphaned, can't focus
                 getWidget().focusRowFromBody();
             }
         }
 
         /*
          * If the server has (re)initialized the rows, our selectionRangeStart
          * row will point to an index that the server knows nothing about,
          * causing problems if doing multi selection with shift. The field will
          * be cleared a little later when the row focus has been restored.
          * (#8584)
          */
         if (uidl.hasAttribute(TableConstants.ATTRIBUTE_KEY_MAPPER_RESET)
                 && uidl.getBooleanAttribute(TableConstants.ATTRIBUTE_KEY_MAPPER_RESET)
                 && getWidget().selectionRangeStart != null) {
             assert !getWidget().selectionRangeStart.isAttached();
             getWidget().selectionRangeStart = getWidget().focusedRow;
         }
 
         getWidget().tabIndex = getState().tabIndex;
         getWidget().setProperTabIndex();
 
         getWidget().resizeSortedColumnForSortIndicator();
 
         // Remember this to detect situations where overflow hack might be
         // needed during scrolling
         getWidget().lastRenderedHeight = getWidget().scrollBody
                 .getOffsetHeight();
 
         getWidget().rendering = false;
         getWidget().headerChangedDuringUpdate = false;
 
     }
 
     @Override
     public VScrollTable getWidget() {
         return (VScrollTable) super.getWidget();
     }
 
     @Override
     public void updateCaption(ComponentConnector component) {
         // NOP, not rendered
     }
 
     @Override
     public void layoutVertically() {
         getWidget().updateHeight();
     }
 
     @Override
     public void layoutHorizontally() {
         getWidget().updateWidth();
     }
 
     @Override
     public void postLayout() {
         VScrollTable table = getWidget();
         if (table.sizeNeedsInit) {
             table.sizeInit();
             Scheduler.get().scheduleFinally(new ScheduledCommand() {
                 @Override
                 public void execute() {
                     getLayoutManager().setNeedsMeasure(TableConnector.this);
                     ServerConnector parent = getParent();
                     if (parent instanceof ComponentConnector) {
                         getLayoutManager().setNeedsMeasure(
                                 (ComponentConnector) parent);
                     }
                     getLayoutManager().setNeedsVerticalLayout(
                             TableConnector.this);
                     getLayoutManager().layoutNow();
                 }
             });
         }
     }
 
     @Override
     public boolean isReadOnly() {
         return super.isReadOnly() || getState().propertyReadOnly;
     }
 
     @Override
     public TableState getState() {
         return (TableState) super.getState();
     }
 
     /**
      * Shows a saved row context menu if the row for the context menu is still
      * visible. Does nothing if a context menu has not been saved.
      * 
      * @param savedContextMenu
      */
     public void showSavedContextMenu(ContextMenuDetails savedContextMenu) {
         if (isEnabled() && savedContextMenu != null) {
             Iterator<Widget> iterator = getWidget().scrollBody.iterator();
             while (iterator.hasNext()) {
                 Widget w = iterator.next();
                 VScrollTableRow row = (VScrollTableRow) w;
                 if (row.getKey().equals(savedContextMenu.rowKey)) {
                     row.showContextMenu(savedContextMenu.left,
                             savedContextMenu.top);
                 }
             }
         }
     }
 
     @Override
     public TooltipInfo getTooltipInfo(Element element) {
 
         TooltipInfo info = null;
 
         if (element != getWidget().getElement()) {
             Object node = Util.findWidget(
                     (com.google.gwt.user.client.Element) element,
                     VScrollTableRow.class);
 
             if (node != null) {
                 VScrollTableRow row = (VScrollTableRow) node;
                 info = row.getTooltip(element);
             }
         }
 
         if (info == null) {
             info = super.getTooltipInfo(element);
         }
 
         return info;
     }
 
     @Override
     public void onConnectorHierarchyChange(
             ConnectorHierarchyChangeEvent connectorHierarchyChangeEvent) {
         // TODO Move code from updateFromUIDL to this method
     }
 
 }