/**
 * 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.grid;

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

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.http.client.RequestBuilder;
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.google.web.bindery.autobean.shared.AutoBean;
import com.google.web.bindery.autobean.shared.AutoBeanFactory;
import com.sencha.gxt.core.client.ValueProvider;
import com.sencha.gxt.data.client.loader.HttpProxy;
import com.sencha.gxt.data.shared.ListStore;
import com.sencha.gxt.data.shared.ModelKeyProvider;
import com.sencha.gxt.data.shared.PropertyAccess;
import com.sencha.gxt.data.shared.loader.ListLoadResultBean;
import com.sencha.gxt.data.shared.loader.JsonReader;
import com.sencha.gxt.data.shared.loader.ListLoadConfig;
import com.sencha.gxt.data.shared.loader.ListLoadResult;
import com.sencha.gxt.data.shared.loader.ListLoader;
import com.sencha.gxt.data.shared.loader.LoadResultListStoreBinding;
import com.sencha.gxt.explorer.client.model.Example.Detail;
import com.sencha.gxt.widget.core.client.FramedPanel;
import com.sencha.gxt.widget.core.client.button.TextButton;
import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
import com.sencha.gxt.widget.core.client.event.SelectEvent;
import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
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.grid.Grid;

@Detail(name = "Json Grid", icon = "jsongrid", category = "Grid")
public class JsonGridExample implements IsWidget, EntryPoint {


  public interface EmailAutoBeanFactory extends AutoBeanFactory {

    AutoBean<RecordResult> items();

    AutoBean<ListLoadConfig> loadConfig();
  }

  public interface Email {
    String getName();

    String getEmail();

    String getPhone();

    String getState();

    String getZip();
  }

  /**
   * Defines the structure of the root JSON object being returned by the server.
   * This class is needed as we cannot return a list of objects. Instead, we
   * return a single object with a single property that contains the data
   * records.
   */
  public interface RecordResult {

    List<Email> getRecords();
  }

  class DataRecordJsonReader extends JsonReader<ListLoadResult<Email>, RecordResult> {
    public DataRecordJsonReader(AutoBeanFactory factory, Class<RecordResult> rootBeanType) {
      super(factory, rootBeanType);
    }

    @Override
    protected ListLoadResult<Email> createReturnData(Object loadConfig, RecordResult incomingData) {
      return new ListLoadResultBean<Email>(incomingData.getRecords());
    }
  }
  
  interface EmailProperties extends PropertyAccess<Email> {
    @Path("name")
    ModelKeyProvider<Email> key();

    ValueProvider<Email, String> name();
    
    ValueProvider<Email, String> email();
    
    ValueProvider<Email, String> phone();
    
    ValueProvider<Email, String> state();
    
    ValueProvider<Email, String> zip();
  }
  
  @Override
  public void onModuleLoad() {
    RootPanel.get().add(this);
  }

  @Override
  public Widget asWidget() {
    EmailAutoBeanFactory factory = GWT.create(EmailAutoBeanFactory.class);

    DataRecordJsonReader reader = new DataRecordJsonReader(factory, RecordResult.class);

    String path = "data/data.json";
    RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);
    HttpProxy<ListLoadConfig> proxy = new HttpProxy<ListLoadConfig>(builder);

    final ListLoader<ListLoadConfig, ListLoadResult<Email>> loader = new ListLoader<ListLoadConfig, ListLoadResult<Email>>(
        proxy, reader);
    loader.useLoadConfig(factory.create(ListLoadConfig.class).as());
    
    EmailProperties props = GWT.create(EmailProperties.class);
    
    ListStore<Email> store = new ListStore<Email>(props.key());
    loader.addLoadHandler(new LoadResultListStoreBinding<ListLoadConfig, Email, ListLoadResult<Email>>(store));
    
    ColumnConfig<Email, String> cc1 = new ColumnConfig<Email, String>(props.name(), 100, "Sender");
    ColumnConfig<Email, String> cc2 = new ColumnConfig<Email, String>(props.email(), 165, "Email");
    ColumnConfig<Email, String> cc3 = new ColumnConfig<Email, String>(props.phone(), 100, "Phone");
    ColumnConfig<Email, String> cc4 = new ColumnConfig<Email, String>(props.state(), 50, "State");
    ColumnConfig<Email, String> cc5 = new ColumnConfig<Email, String>(props.zip(), 65, "Zip Code");
    
    List<ColumnConfig<Email, ?>> l = new ArrayList<ColumnConfig<Email, ?>>();
    l.add(cc1);
    l.add(cc2);
    l.add(cc3);
    l.add(cc4);
    l.add(cc5);
    ColumnModel<Email> cm = new ColumnModel<Email>(l);

    Grid<Email> grid = new Grid<Email>(store, cm);
    grid.getView().setForceFit(true);
    grid.setLoader(loader);
    grid.setLoadMask(true);
    grid.setBorders(true);
    grid.getView().setEmptyText("Please hit the load button.");
    
    FramedPanel cp = new FramedPanel();
    cp.setHeadingText("Json Grid Example");
    cp.setCollapsible(true);
    cp.setAnimCollapse(true);
    cp.setWidget(grid);
    cp.setPixelSize(575, 350);
    cp.addStyleName("margin-10");
    cp.setButtonAlign(BoxLayoutPack.CENTER);
    cp.addButton(new TextButton("Load Json", new SelectHandler() {
      
      @Override
      public void onSelect(SelectEvent event) {
        loader.load();
      }
    }));
    
    return cp;
  }

}