/*
    * 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.myfaces.tobago.util;
  
  import org.apache.myfaces.tobago.internal.util.StringUtils;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Locale;
  
  public final class LocaleUtils {
  
    private LocaleUtils() {
    }
  
    public static Locale createLocale(final String value) {
      Locale locale = null;
      final String[] strings = StringUtils.split(value, "_");
      switch (strings.length) {
        case 1:
          locale = new Locale(strings[0]);
          break;
        case 2:
          locale = new Locale(strings[0], strings[1]);
          break;
        case 3:
          locale = new Locale(strings[0], strings[1], strings[2]);
          break;
        default:
          // TODO
      }
      return locale;
    }
  
    /**
     * @deprecated since 1.5
     */
    @Deprecated
    public static List<Locale> getLocaleList(final Locale locale) {
  
      String string = locale.toString();
      final List<Locale> locales = new ArrayList<>(3);
      locales.add(locale);
      int underscore;
      while ((underscore = string.lastIndexOf('_')) > 0) {
        string = string.substring(0, underscore);
        locales.add(createLocale(string));
      }
  
      return locales;
    }
  
    /**
     * Returns a list of strings, which are used as suffix for resources from resource manager.
     * <p>
     * Sample: "de_DE" -&gt; "_de_DE", "_de", ""
     */
    public static List<String> getLocaleSuffixList(final Locale locale) {
  
      if (locale == null) {
        return Arrays.asList("");
      }
  
      String string = locale.toString();
      final String prefix = "_";
      final List<String> locales = new ArrayList<>(4);
      locales.add(prefix + string);
      int underscore;
      while ((underscore = string.lastIndexOf('_')) > 0) {
        string = string.substring(0, underscore);
        locales.add(prefix + string);
      }
  
      locales.add(""); // default suffix is nothing
  
      return locales;
    }
  
  }