content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.acacia.client.widgets.complex;
  
  import org.opencms.acacia.client.css.I_CmsLayoutBundle;
  import org.opencms.acacia.client.widgets.complex.CmsDataViewPreviewWidget.I_ImageProvider;
  import org.opencms.acacia.shared.CmsEntity;
  import org.opencms.gwt.client.util.CmsEmbeddedDialogHandler;
  import org.opencms.gwt.shared.CmsDataViewConstants;
  import org.opencms.gwt.shared.CmsDataViewParamEncoder;
  import org.opencms.util.CmsUUID;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import com.google.common.collect.Lists;
  import com.google.common.collect.Maps;
  import com.google.gwt.dom.client.Style.Unit;
  import com.google.gwt.event.dom.client.ClickEvent;
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.json.client.JSONArray;
  import com.google.gwt.json.client.JSONObject;
  import com.google.gwt.json.client.JSONParser;
  import com.google.gwt.json.client.JSONString;
  import com.google.gwt.json.client.JSONValue;
  import com.google.gwt.user.client.ui.Composite;
  import com.google.gwt.user.client.ui.Widget;
  
  /**
   * The client-side widget for data view items.<p>
   *
   * This widget by itself doesn't allow you to edit the information directly,
   * instead it opens a popup window when clicked, in which the user can then select items
   * from the configured data view.<p>
   *
   */
  public class CmsDataViewClientWidget extends Composite {
  
      /** The name of the callback. */
      public static final String CALLBACK = "cmsDataViewCallback";
  
      /** Map of accessors, with their IDs as keys. */
      private static Map<String, CmsDataViewValueAccessor> accessors = Maps.newHashMap();
  
      /** The entity for which the widget was instantiated. */
      private CmsEntity m_entity;
  
      /** The configuration string. */
      private String m_config;
  
      /** The JSON configuration. */
      private JSONObject m_jsonConfig;
  
      /** Object used to read values from  or write them back to the editor. */
      private CmsDataViewValueAccessor m_valueAccessor;
  
      /**
       * Creates a new instance.<p>
       *
       * @param valueAccessor object used to read/write values from and to the editor
       * @param configString the configuration string
       */
      public CmsDataViewClientWidget(CmsDataViewValueAccessor valueAccessor, String configString) {
          m_valueAccessor = valueAccessor;
          m_valueAccessor.setWidget(this);
  
          accessors.put(valueAccessor.getId(), valueAccessor);
          m_config = configString;
  
          m_jsonConfig = JSONParser.parseLenient(configString).isObject();
  
          Widget widget = createWidget();
          initWidget(widget);
          addStyleName(I_CmsLayoutBundle.INSTANCE.form().widget());
          widget.getElement().getStyle().setMarginLeft(-20, Unit.PX);
  
          ensureCallback(CALLBACK);
          addDomHandler(new ClickHandler() {
  
              @SuppressWarnings("synthetic-access")
              public void onClick(ClickEvent event) {
  
                  m_jsonConfig.put(CmsDataViewConstants.PARAM_CALLBACK, new JSONString(CALLBACK));
                  m_jsonConfig.put(
                      CmsDataViewConstants.PARAM_CALLBACK_ARG,
                      new JSONString("{" + CmsDataViewConstants.ACCESSOR + ": '" + m_valueAccessor.getId() + "'}"));
  
                  CmsEmbeddedDialogHandler handler = new CmsEmbeddedDialogHandler();
                  Map<String, String> additionalParams = new HashMap<String, String>();
                  additionalParams.put(
                      CmsDataViewConstants.PARAM_CONFIG,
                      CmsDataViewParamEncoder.encodeString(m_jsonConfig.toString()));
                  handler.openDialog(
                      CmsDataViewConstants.DATAVIEW_DIALOG,
                      null,
                      new ArrayList<CmsUUID>(),
                      additionalParams);
              }
          }, ClickEvent.getType());
      }
  
      /**
       * Ensures that the javascript callback is installed.<p>
       *
       * @param name the name of the callback function
       */
      public static native void ensureCallback(String name) /*-{
          if (!($wnd[name])) {
              $wnd[name] = function(x) {
                  var json = JSON.stringify(x);
                  @org.opencms.acacia.client.widgets.complex.CmsDataViewClientWidget::handleResult(Ljava/lang/String;)(json);
              };
          }
      }-*/;
  
      /**
       * Handles the JSON results returned by the embedded Vaadin dialog.<p>
       *
       * @param json the JSON results
       */
      public static void handleResult(String json) {
  
          JSONObject jsonObj = JSONParser.parseLenient(json).isObject();
          JSONArray results = jsonObj.get(CmsDataViewConstants.KEY_RESULT).isArray();
          String accessorId = jsonObj.get(CmsDataViewConstants.ACCESSOR).isString().stringValue();
          CmsDataViewValueAccessor accessor = accessors.get(accessorId);
          List<CmsDataViewValue> values = Lists.newArrayList();
          for (int i = 0; i < results.size(); i++) {
              JSONObject singleResult = results.get(i).isObject();
              String id = singleResult.get(CmsDataViewConstants.FIELD_ID).isString().stringValue();
              String title = singleResult.get(CmsDataViewConstants.FIELD_TITLE).isString().stringValue();
              String description = singleResult.get(CmsDataViewConstants.FIELD_DESCRIPTION).isString().stringValue();
              String data = singleResult.get(CmsDataViewConstants.FIELD_DATA).isString().stringValue();
              CmsDataViewValue value = new CmsDataViewValue(id, title, description, data);
              values.add(value);
          }
          accessor.replaceValue(values);
      }
  
      /**
       * Creates the correct widget based on the configuration.<p>
       *
       * @return the new widget
       */
      Widget createWidget() {
  
          if (isTrue(m_jsonConfig, CmsDataViewConstants.CONFIG_PREVIEW)) {
              return new CmsDataViewPreviewWidget(
                  m_config,
                  m_valueAccessor,
                  new CmsDataViewPreviewWidget.ContentImageLoader());
          } else {
              I_ImageProvider provider = null;
              CmsDataViewValue val = m_valueAccessor.getValue();
              JSONValue iconVal = m_jsonConfig.get(CmsDataViewConstants.CONFIG_ICON);
              if ((iconVal != null) && (iconVal.isString() != null)) {
                  provider = new CmsDataViewPreviewWidget.SimpleImageLoader(iconVal.isString().stringValue());
              }
              return new CmsDataViewPreviewWidget(m_config, m_valueAccessor, provider);
          }
  
      }
  
      /**
       * Checks if a property in a JSON object is either the boolean value 'true' or a string representation of that value.<p>
       *
       * @param obj the JSON object
       * @param property the property name
       * @return true if the value represents the boolean 'true'
       */
      private boolean isTrue(JSONObject obj, String property) {
  
          JSONValue val = obj.get(property);
          if (val == null) {
              return false;
          }
          boolean stringTrue = ((val.isString() != null) && Boolean.parseBoolean(val.isString().stringValue()));
          boolean boolTrue = ((val.isBoolean() != null) && val.isBoolean().booleanValue());
          return stringTrue || boolTrue;
      }
  }
  