/*
    * 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;
  
  import java.text.NumberFormat;
  import java.util.IllformedLocaleException;
  import java.util.Locale;
  
  import org.htmlunit.BrowserVersion;
  import org.htmlunit.corejs.javascript.Context;
  import org.htmlunit.corejs.javascript.Function;
  import org.htmlunit.corejs.javascript.Scriptable;
  import org.htmlunit.javascript.JavaScriptEngine;
  
  /**
   * Contains some missing features of Rhino NativeNumber.
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   */
  public final class NumberCustom {
  
      private NumberCustom() {
          super();
      }
  
      /**
       * Returns a string with a language sensitive representation of this number.
       * @param context the JavaScript context
       * @param scope the scope
       * @param thisObj the scriptable
       * @param args the arguments passed into the method
       * @param function the function
       * @return the string
       */
      public static String toLocaleString(final Context context, final Scriptable scope,
              final Scriptable thisObj, final Object[] args, final Function function) {
          if (args.length != 0 && args[0] instanceof String) {
              final String localeStr = (String) args[0];
              try {
                  final Locale locale = new Locale.Builder().setLanguageTag(localeStr).build();
                  return NumberFormat.getInstance(locale).format(Double.parseDouble(thisObj.toString()));
              }
              catch (final IllformedLocaleException e) {
                  throw JavaScriptEngine.rangeError("Invalid language tag: " + localeStr);
              }
          }
  
          final BrowserVersion browserVersion = ((Window) thisObj.getParentScope()).getBrowserVersion();
          final Locale locale = Locale.forLanguageTag(browserVersion.getBrowserLanguage());
          return NumberFormat.getInstance(locale).format(Double.parseDouble(thisObj.toString()));
      }
  }