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.sse.wicket.markup;
  
  import java.util.UUID;
  
  import org.apache.causeway.applib.value.LocalResourcePath;
  import org.apache.causeway.commons.internal.resources._Resources;
  import org.apache.causeway.core.config.viewer.web.WebAppContextPath;
  
  import static org.apache.causeway.commons.internal.base._Strings.isNullOrEmpty;
  
  import lombok.extern.log4j.Log4j2;
  
  @Log4j2
  final class ListeningMarkupComponent_observing  {
  
      private static final String jScriptTemplateResource = "js/ObservingComponent.js";
  
      static CharSequence decorate(
              final CharSequence htmlContent,
              final LocalResourcePath observing,
              final WebAppContextPath webAppContextPath) {
          if(observing==null) {
              return htmlContent;
          }
          final String jScriptTemplate;
          try {
              jScriptTemplate = _Resources.loadAsStringUtf8ElseFail(ListeningMarkupComponent_observing.class, jScriptTemplateResource);
          } catch (Exception e) {
              log.warn("resource not found class:{} path:{}",
                      ListeningMarkupComponent_observing.class, jScriptTemplateResource, e);
              return resourceNotFound();
          }
  
          if(isNullOrEmpty(jScriptTemplate)) {
              return resourceNotFound();
          }
  
          final String targetId = UUID.randomUUID().toString();
          final String observingPath = observing.getEffectivePath(webAppContextPath::prependContextPath);
  
          final StringBuilder sb = new StringBuilder();
          sb
          .append("<div id=\"").append(targetId).append("\">\n")
          .append(htmlContent)
          .append("\n</div>\n")
          .append("<script type=\"text/javascript\" defer>\n")
          .append(jScriptTemplate
                  .replace("${targetId}", targetId)
                  .replace("${observing}", observingPath))
          .append("\n</script>\n");
  
          return sb.toString();
      }
  
      private static String resourceNotFound() {
          return "Template resource not found: '"+jScriptTemplateResource+"'.";
      }
  
  }
  