package com.test.client;

import com.google.gwt.user.client.HTTPRequest;
import com.google.gwt.user.client.ResponseTextHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;
import com.google.gwt.user.client.ui.Widget;

import java.util.Iterator;
import java.util.Set;

public class JSON {
  /**
   * Class for handling the response text associated with a request
for a JSON
   * object.
   *
   */

  private class JSONResponseTextHandler implements ResponseTextHandler
{
          /*
           *  (non-Javadoc)
           * @see
com.google.gwt.user.client.ResponseTextHandler#onCompletion(java.lang.String)
           */

        public void onCompletion(String responseText) {
        /*
         *  When the fetch has been completed we parse the JSON response and
         *  display the result
         */

                  //JSONObject jsonObject;
              try {
                JSONObject jsonObject = JSONParser.parse(responseText);
                displayJSONObject(jsonObject);

              } catch (JSONException e) {

              }

                searchButton.setText(SEARCH_BUTTON_DEFAULT_TEXT);

         }

            private void displayJSONObject(JSONObject jsonObject) {
            /*
             * Here we clear the grid and fill it with the new values.
             */
                childGrid.clear();
                    requestChildrenGrid(jsonObject);
                gdOut.setWidget(1,0,childGrid);

              }

            private void requestChildrenGrid(JSONValue jsonValue){

                /*
                     * Here we fill the grid.
                     */

            JSONObject jsonObject;
            if(jsonValue.isArray() != null){
                for(int i = 0; i < jsonValue.isArray().size();i++){
                        requestChildrenGrid(jsonValue.isArray().get(i));
                        childGrid.setWidget(itemNumber,0,new HTML("<HR/>"));
                        childGrid.setWidget(itemNumber,1,new HTML("<HR/>"));

                        itemNumber++;
                        int resizeNumber = itemNumber + 1;
                        childGrid.resize(resizeNumber,2);
                }
            } else {

                if ((jsonObject = jsonValue.isObject()) != null) {
                        String[] keys = jsonObject.getKeys();

                        for (int i = 0; i < keys.length; ++i) {
                          String key = keys[i];
                          childGrid.setWidget(itemNumber,0,new HTML("<B>"+ key  +":</
B>"));
                          childGrid.setWidget(itemNumber,1,new
HTML(jsonObject.get(key).toString()));
                          requestChildrenGrid(jsonObject.get(key));

                          itemNumber++;
                          int resizeNumber = itemNumber + 1;
                          childGrid.resize(resizeNumber,2);
                        }
                } else if (jsonValue != null) {
                // Only JSONObject, and JSONArray do anything special with
toString, so
                // it is safe to handle all non-null cases by simply using
toString
                //

                } else {
               //
                }

            }

          }
  }

  /*
   * Class for handling the fetch button's click event.
   */
  private class SearchButtonClickListener implements ClickListener {
          /*
           *  (non-Javadoc)
           * @see
com.google.gwt.user.client.ui.ClickListener#onClick(com.google.gwt.user.client.ui.Widget)
           */
                public void onClick(Widget sender) {
                  /*
                   * When the user click the button we fetch the URL.
                   */
                              itemNumber = 0;
                              doFetchURL();
                        }

  }

  /*
   * Default URL to use to fetch JSON objects. Note that the contents
of this
   * JSON result were as a result of requesting the following URL:
   *
   * http://api.search.yahoo.com/ImageSearchService/V1/imageSearch?appid=Y...
   *
   */
  private static final String DEFAULT_SEARCH_URL = "http://
www.mywebpage.de/gwt/index.php";

  /*
   * Text displayed on the fetch button when we are in a default
state.
   */
  private static final String SEARCH_BUTTON_DEFAULT_TEXT = "Search";

  /*
   * Text displayed on the fetch button when we are waiting for a JSON
reply.
   */
  private static final String SEARCH_BUTTON_WAITING_TEXT = "Waiting
for JSON Response...";

  /**
   * Entry point for this simple application. Currently, we build the
   * application's form and wait for events.
   */
  public void onModuleLoad() {
    initializeMainForm();
  }

  /*
   * Fetch the requested URL.
   */
  private void doFetchURL() {
    searchButton.setText(SEARCH_BUTTON_WAITING_TEXT);
    if (!HTTPRequest.asyncGet(DEFAULT_SEARCH_URL, new
JSONResponseTextHandler())) {
      // Reset the caption.
      //
      searchButton.setText(SEARCH_BUTTON_DEFAULT_TEXT);
    }
  }

  /**
   * Initialize the main form's layout and content.
   */
  private void initializeMainForm() {

          /*
           *  Here we initialize and setup a panel for use it as container
for the search form and
           *  the results.
           */

          FocusPanel fpn = new FocusPanel();
          Grid gd = new Grid(1,2);

          gd.setWidget(0, 0, txtBox);
          gd.setWidget(0, 1, searchButton);

          gdOut.setWidget(0,0,gd);

          gdOut.setBorderWidth(1);
      gdOut.setWidth("500px");

      childGrid.setCellPadding(0);
          childGrid.setCellSpacing(0);
          childGrid.setWidth("490px");

    searchButton.setText(SEARCH_BUTTON_DEFAULT_TEXT);
    searchButton.addClickListener(new ClickListener() {
        public void onClick(Widget sender) {
                 //itemNumber = 0;
                 searchButton.setText(SEARCH_BUTTON_WAITING_TEXT);
                    if (!HTTPRequest.asyncGet(DEFAULT_SEARCH_URL + "?
tosearch=" + txtBox.getText(), new JSONResponseTextHandler())) {
                      // Reset the caption.

                      searchButton.setText(SEARCH_BUTTON_DEFAULT_TEXT);
                    }
            }

        });

          fpn.add(gdOut);

        RootPanel.get().add(fpn);

  }

  private Button searchButton = new Button();
  private Grid gdOut = new Grid(2,1);
  private Grid childGrid = new Grid(5,2);
  private TextBox txtBox = new TextBox();
  private int itemNumber = 0;

}