/*
    * 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 java.util.ArrayList;
  import java.util.List;
  
  import org.htmlunit.cssparser.dom.AbstractCSSRuleImpl;
  import org.htmlunit.cssparser.dom.CSSCharsetRuleImpl;
  import org.htmlunit.cssparser.dom.CSSMediaRuleImpl;
  import org.htmlunit.cssparser.dom.CSSRuleListImpl;
  import org.htmlunit.javascript.JavaScriptEngine;
  import org.htmlunit.javascript.configuration.JsxClass;
  import org.htmlunit.javascript.configuration.JsxConstructor;
  import org.htmlunit.javascript.configuration.JsxFunction;
  import org.htmlunit.javascript.configuration.JsxGetter;
  import org.w3c.dom.DOMException;
  
  /**
   * A JavaScript object for {@code CSSGroupingRule}.
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   * @author Frank Danek
   * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/CSSGroupingRule">MDN doc</a>
   */
  @JsxClass
  public class CSSGroupingRule extends CSSRule {
  
      /** The collection of rules defined in this rule. */
      private CSSRuleList cssRules_;
      private List<Integer> cssRulesIndexFix_;
  
      /**
       * Creates a new instance.
       */
      public CSSGroupingRule() {
          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 CSSGroupingRule(final CSSStyleSheet stylesheet, final CSSMediaRuleImpl rule) {
          super(stylesheet, rule);
      }
  
      /**
       * Returns the collection of rules defined in this rule.
       * @return the collection of rules defined in this rule
       */
      @JsxGetter
      public CSSRuleList getCssRules() {
          initCssRules();
          return cssRules_;
      }
  
      /**
       * Inserts a new rule.
       * @param rule the CSS rule
       * @param position the position at which to insert the rule
       * @return the position of the inserted rule
       */
      @JsxFunction
      public int insertRule(final String rule, final Object position) {
          final int positionInt;
          if (position == null) {
              positionInt = 0;
          }
          else if (JavaScriptEngine.isUndefined(position)) {
              positionInt = 0;
          }
          else {
              positionInt = JavaScriptEngine.toInt32(position);
          }
  
         try {
             initCssRules();
             getGroupingRule().insertRule(rule, fixIndex(positionInt));
             refreshCssRules();
             return positionInt;
         }
         catch (final DOMException e) {
             // in case of error try with an empty rule
             final int pos = rule.indexOf('{');
             if (pos > -1) {
                 final String newRule = rule.substring(0, pos) + "{}";
                 try {
                     getGroupingRule().insertRule(newRule, fixIndex(positionInt));
                     refreshCssRules();
                     return positionInt;
                 }
                 catch (final DOMException ex) {
                     throw JavaScriptEngine.asJavaScriptException(
                             getWindow(), ex.getMessage(), ex.code);
                 }
             }
             throw JavaScriptEngine.asJavaScriptException(
                     getWindow(),
                     e.getMessage(),
                     org.htmlunit.javascript.host.dom.DOMException.SYNTAX_ERR);
         }
     }
 
     /**
      * Deletes an existing rule.
      * @param position the position of the rule to be deleted
      */
     @JsxFunction
     public void deleteRule(final int position) {
         try {
             initCssRules();
             getGroupingRule().deleteRule(fixIndex(position));
             refreshCssRules();
         }
         catch (final DOMException e) {
             throw JavaScriptEngine.asJavaScriptException(getWindow(), e.getMessage(), e.code);
         }
     }
 
     private void initCssRules() {
         if (cssRules_ == null) {
             cssRules_ = new CSSRuleList(this);
             cssRulesIndexFix_ = new ArrayList<>();
             refreshCssRules();
         }
     }
 
     private int fixIndex(int index) {
         for (final int fix : cssRulesIndexFix_) {
             if (fix > index) {
                 return index;
             }
             index++;
         }
         return index;
     }
 
     private void refreshCssRules() {
         if (cssRules_ == null) {
             return;
         }
 
         cssRules_.clearRules();
         cssRulesIndexFix_.clear();
 
         final CSSRuleListImpl ruleList = getGroupingRule().getCssRules();
         final List<AbstractCSSRuleImpl> rules = ruleList.getRules();
         int pos = 0;
         for (final AbstractCSSRuleImpl rule : rules) {
             if (rule instanceof CSSCharsetRuleImpl) {
                 cssRulesIndexFix_.add(pos);
                 continue;
             }
 
             final CSSRule cssRule = CSSRule.create(getParentStyleSheet(), rule);
             if (null == cssRule) {
                 cssRulesIndexFix_.add(pos);
             }
             else {
                 cssRules_.addRule(cssRule);
             }
             pos++;
         }
     }
 
     /**
      * Returns the wrapped rule, as a media rule.
      * @return the wrapped rule, as a media rule
      */
     private CSSMediaRuleImpl getGroupingRule() {
         return (CSSMediaRuleImpl) getRule();
     }
 }