content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.extensions.fullcalendar.wkt.integration.fc.callback;
  
  import java.util.UUID;
  
  import org.apache.wicket.Component;
  import org.apache.wicket.ajax.AjaxRequestTarget;
  import org.apache.wicket.ajax.attributes.AjaxCallListener;
  import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
  
  abstract class AbstractAjaxCallbackWithClientsideRevert extends AbstractAjaxCallback {
  
      private static final long serialVersionUID = 1L;
  
      private String uuid = "u" + UUID.randomUUID().toString().replace("-", "");
  
  	protected abstract String getRevertScript();
  
  	protected abstract boolean onEvent(AjaxRequestTarget target);
  
  	private String getRevertScriptBlock() {
  		return "{" + getRevertScript() + ";}";
  	}
  
  	@Override
  	protected final void respond(final AjaxRequestTarget target) {
  		boolean result = onEvent(target);
  		target.prependJavaScript(String.format("$.data(document, '%s', %s);", uuid, String.valueOf(result)));
  	}
  
  	@Override
  	protected void updateAjaxAttributes(final AjaxRequestAttributes attributes) {
  		super.updateAjaxAttributes(attributes);
  		AjaxCallListener listener = new AjaxCallListener() {
              private static final long serialVersionUID = 1L;
  
              @Override
  			public CharSequence getSuccessHandler(final Component component) {
  				return String.format("if (false===$.data(document, '%s')) %s $.removeData(document, '%s');", uuid,
  					getRevertScriptBlock(), uuid);
  			}
  
  			@Override
  			public CharSequence getFailureHandler(final Component component) {
  				return getRevertScriptBlock();
  			}
  		};
  		attributes.getAjaxCallListeners().add(listener);
  	}
  
  }
  