/*
    * Copyright (c) 2002-2025 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.css;
  
  import org.htmlunit.css.CssMediaList;
  import org.htmlunit.css.CssStyleSheet;
  import org.htmlunit.cssparser.dom.CSSImportRuleImpl;
  import org.htmlunit.cssparser.dom.MediaListImpl;
  import org.htmlunit.javascript.configuration.JsxClass;
  import org.htmlunit.javascript.configuration.JsxConstructor;
  import org.htmlunit.javascript.configuration.JsxGetter;
  import org.htmlunit.javascript.host.html.HTMLElement;
  
  /**
   * A JavaScript object for {@code CSSImportRule}.
   *
   * @author Daniel Gredler
   * @author Ahmed Ashour
   * @author Ronald Brill
   */
  @JsxClass
  public class CSSImportRule extends CSSRule {
  
      private MediaList media_;
      private CSSStyleSheet importedStylesheet_;
  
      /**
       * Creates a new instance.
       */
      public CSSImportRule() {
          super();
      }
  
      /**
       * Creates an instance.
       */
      @JsxConstructor
      @Override
      public void jsConstructor() {
          super.jsConstructor();
      }
  
      /**
       * Creates a new instance.
       * @param stylesheet the Stylesheet of this rule.
       * @param rule the wrapped rule
       */
      protected CSSImportRule(final CSSStyleSheet stylesheet, final CSSImportRuleImpl rule) {
          super(stylesheet, rule);
      }
  
      /**
       * Returns the URL of the imported style sheet.
       * @return the URL of the imported style sheet
       */
      @JsxGetter
      public String getHref() {
          return getImportRule().getHref();
      }
  
      /**
       * Returns the media types that the imported CSS style sheet applies to.
       * @return the media types that the imported CSS style sheet applies to
       */
      @JsxGetter
      public MediaList getMedia() {
          if (media_ == null) {
              final CSSStyleSheet parent = getParentStyleSheet();
              final MediaListImpl ml = getImportRule().getMedia();
  
              media_ = new MediaList(parent, new CssMediaList(ml));
          }
          return media_;
      }
  
      /**
       * Returns the style sheet referred to by this rule.
       * @return the style sheet referred to by this rule
       */
      @JsxGetter
      public CSSStyleSheet getStyleSheet() {
          if (importedStylesheet_ == null) {
              final CSSStyleSheet owningSheet = getParentStyleSheet();
              final HTMLElement ownerNode = owningSheet.getOwnerNode();
              final CssStyleSheet importedSheet = owningSheet.getCssStyleSheet().getImportedStyleSheet(getImportRule());
              importedStylesheet_ = new CSSStyleSheet(null, ownerNode.getWindow(), importedSheet);
          }
         return importedStylesheet_;
     }
 
     /**
      * Returns the wrapped rule, as an import rule.
      * @return the wrapped rule, as an import rule
      */
     private CSSImportRuleImpl getImportRule() {
         return (CSSImportRuleImpl) getRule();
     }
 }