/**
 * Sencha GXT 3.0.0b - Sencha for GWT
 * Copyright(c) 2007-2012, Sencha, Inc.
 * licensing@sencha.com
 *
 * http://www.sencha.com/products/gxt/license/
 */
package com.sencha.gxt.explorer.client.treegrid;

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

import com.google.gwt.cell.client.DateCell;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.editor.client.Editor.Path;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.DateTimeFormat.PredefinedFormat;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import com.sencha.gxt.core.client.ValueProvider;
import com.sencha.gxt.data.client.loader.RpcProxy;
import com.sencha.gxt.data.shared.ModelKeyProvider;
import com.sencha.gxt.data.shared.PropertyAccess;
import com.sencha.gxt.data.shared.TreeStore;
import com.sencha.gxt.data.shared.loader.ChildTreeStoreBinding;
import com.sencha.gxt.data.shared.loader.TreeLoader;
import com.sencha.gxt.examples.resources.client.FileService;
import com.sencha.gxt.examples.resources.client.FileServiceAsync;
import com.sencha.gxt.examples.resources.client.images.ExampleImages;
import com.sencha.gxt.examples.resources.client.model.FileModel;
import com.sencha.gxt.examples.resources.client.model.FolderModel;
import com.sencha.gxt.explorer.client.model.Example;
import com.sencha.gxt.widget.core.client.FramedPanel;
import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
import com.sencha.gxt.widget.core.client.grid.ColumnConfig;
import com.sencha.gxt.widget.core.client.grid.ColumnModel;
import com.sencha.gxt.widget.core.client.treegrid.TreeGrid;

@Example.Detail(name = "Async TreeGrid", category = "TreeGrid", icon = "asynctreegrid")
public class AsyncTreeGridExample implements IsWidget, EntryPoint {

  interface TreeBundle extends ClientBundle {
    ImageResource plus();
    ImageResource minus();
    ImageResource folder();
    ImageResource folderOpen();
  }
  
  public interface FileModelProperties extends PropertyAccess<FileModel> {
    @Path("id")
    ModelKeyProvider<FileModel> key();

    ValueProvider<FileModel, String> name();

    ValueProvider<FileModel, String> path();

    ValueProvider<FileModel, Date> lastModified();

    ValueProvider<FileModel, Long> size();
  }

  @Override
  public void onModuleLoad() {
    RootPanel.get().add(this);
  }

  @Override
  public Widget asWidget() {
    TreeBundle bundle = GWT.create(TreeBundle.class);
    
    final FileServiceAsync service = GWT.create(FileService.class);

    RpcProxy<FileModel, List<FileModel>> proxy = new RpcProxy<FileModel, List<FileModel>>() {
      
      @Override
      public void load(FileModel loadConfig, AsyncCallback<List<FileModel>> callback) {
        service.getFolderChildren(loadConfig, callback);
      }
    };
    
    final TreeLoader<FileModel> loader = new TreeLoader<FileModel>(proxy) {
      @Override
      public boolean hasChildren(FileModel parent) {
        return parent instanceof FolderModel;
      }
    };
   
    
    FileModelProperties props = GWT.create(FileModelProperties.class);
    
    TreeStore<FileModel> store = new TreeStore<FileModel>(props.key());
    loader.addLoadHandler(new ChildTreeStoreBinding<FileModel>(store));
    
    ColumnConfig<FileModel, String> cc1 = new ColumnConfig<FileModel, String>(props.name(), 100, "Name");
    
    ColumnConfig<FileModel, Date> cc2 = new ColumnConfig<FileModel, Date>(props.lastModified(), 100, "Date");
    cc2.setCell(new DateCell(DateTimeFormat.getFormat(PredefinedFormat.DATE_MEDIUM)));
    
    ColumnConfig<FileModel, Long> cc3 = new ColumnConfig<FileModel, Long>(props.size(), 100, "Size");
    
    List<ColumnConfig<FileModel, ?>> l = new ArrayList<ColumnConfig<FileModel, ?>>();
    l.add(cc1);
    l.add(cc2);
    l.add(cc3);

    ColumnModel<FileModel> cm = new ColumnModel<FileModel>(l);
    
    FramedPanel cp = new FramedPanel() {
      @Override
      protected void onAfterFirstAttach() {
        super.onAfterFirstAttach();
        loader.load();
      }
    };
    cp.setHeadingText("Async TreeGrid");
    cp.setButtonAlign(BoxLayoutPack.CENTER);
    cp.setPixelSize(600, 300);
    cp.addStyleName("margin-10");
    
    TreeGrid<FileModel> tree = new TreeGrid<FileModel>(store, cm, cc1);
    tree.setBorders(true);
    tree.setTreeLoader(loader);
    tree.getView().setTrackMouseOver(false);
    tree.getView().setAutoExpandColumn(cc1);
    tree.getStyle().setJointCloseIcon(bundle.plus());
    tree.getStyle().setJointOpenIcon(bundle.minus());
    tree.getStyle().setNodeCloseIcon(bundle.folder());
    tree.getStyle().setNodeOpenIcon(bundle.folderOpen());
    tree.getStyle().setLeafIcon(ExampleImages.INSTANCE.java());
    cp.setWidget(tree);
    
    return cp;
  }

}