/*
    * Copyright (c) 2002-2026 Gargoyle Software Inc.
    *
    * Licensed 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
    * https://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.htmlunit.javascript.host.dom;
  
  import static org.htmlunit.html.DomElement.ATTRIBUTE_NOT_DEFINED;
  
  import org.htmlunit.corejs.javascript.Scriptable;
  import org.htmlunit.html.HtmlElement;
  import org.htmlunit.javascript.HtmlUnitScriptable;
  import org.htmlunit.javascript.JavaScriptEngine;
  import org.htmlunit.javascript.configuration.JsxClass;
  import org.htmlunit.javascript.configuration.JsxConstructor;
  
  /**
   * A JavaScript object for {@code DOMStringMap}.
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   */
  @JsxClass
  public final class DOMStringMap extends HtmlUnitScriptable {
  
      private static final String DATA_PREFIX = "data-";
  
      /**
       * Creates an instance.
       */
      public DOMStringMap() {
          super();
      }
  
      /**
       * JavaScript constructor.
       */
      @JsxConstructor
      public void jsConstructor() {
          // nothing to do
      }
  
      /**
       * Creates an instance.
       * @param node the node which contains the underlying string
       */
      public DOMStringMap(final Node node) {
          super();
          setDomNode(node.getDomNodeOrDie(), false);
          setParentScope(node.getParentScope());
          setPrototype(getPrototype(getClass()));
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Object get(final String name, final Scriptable start) {
          final HtmlElement e = (HtmlElement) getDomNodeOrNull();
          if (e != null) {
              final String value = e.getAttribute(DATA_PREFIX + deCamelize(name));
              if (ATTRIBUTE_NOT_DEFINED != value) {
                  return value;
              }
          }
          return super.get(name, start);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void put(final String name, final Scriptable start, final Object value) {
          final HtmlElement e = (HtmlElement) getDomNodeOrNull();
          if (e == null) {
              super.put(name, start, value);
          }
          else {
              e.setAttribute("data-" + deCamelize(name), JavaScriptEngine.toString(value));
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void delete(final String name) {
          final HtmlElement e = (HtmlElement) getDomNodeOrNull();
          if (e == null) {
              super.delete(name);
         }
         else {
             e.removeAttribute("data-" + deCamelize(name));
         }
     }
 
     /**
      * Transforms the specified string from camel-cased to dash separated.
      *
      * @param string the string to decamelize
      * @return the transformed string
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset#name_conversion">
      *      MDN - HTMLElement.dataset - Name conversion</a>
      */
     private static String deCamelize(final String string) {
         if (string == null || string.isEmpty()) {
             return string;
         }
 
         final StringBuilder builder = new StringBuilder();
         for (int i = 0; i < string.length(); i++) {
             final char ch = string.charAt(i);
             if (Character.isUpperCase(ch)) {
                 builder.append('-').append(Character.toLowerCase(ch));
             }
             else {
                 builder.append(ch);
             }
         }
         return builder.toString();
     }
 
 }