/*
    * Copyright (c) 2011-2024 PrimeFaces Extensions
    *
    *  Permission is hereby granted, free of charge, to any person obtaining a copy
    *  of this software and associated documentation files (the "Software"), to deal
    *  in the Software without restriction, including without limitation the rights
    *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    *  copies of the Software, and to permit persons to whom the Software is
    *  furnished to do so, subject to the following conditions:
   *
   *  The above copyright notice and this permission notice shall be included in
   *  all copies or substantial portions of the Software.
   *
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   *  THE SOFTWARE.
   */
  package org.primefaces.extensions.converter;
  
  import java.io.Serializable;
  import java.util.Locale;
  
  import javax.faces.application.FacesMessage;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.convert.Converter;
  import javax.faces.convert.ConverterException;
  import javax.faces.convert.FacesConverter;
  
  import org.primefaces.extensions.util.ExtLangUtils;
  import org.primefaces.util.Constants;
  import org.primefaces.util.LangUtils;
  
  /**
   * {@link Converter} which converts a string to a {@link java.util.Locale} an vice-versa.
   *
   * @author Thomas Andraschko / last modified by $Author$
   * @version $Revision$
   * @since 0.2
   */
  @FacesConverter(value = "org.primefaces.extensions.converter.LocaleConverter")
  public class LocaleConverter implements Converter<Object>, Serializable {
  
      private static final long serialVersionUID = 20121214L;
  
      private char separator = '_';
  
      @Override
      public Object getAsObject(final FacesContext fc, final UIComponent component, final String value) {
          if (LangUtils.isBlank(value)) {
              return fc.getApplication().getDefaultLocale();
          }
  
          return getLocaleObject(value, separator);
      }
  
      @Override
      public String getAsString(final FacesContext fc, final UIComponent component, final Object value) {
          if (value == null) {
              final Locale defaultLocale = fc.getApplication().getDefaultLocale();
              if (defaultLocale == null) {
                  return null;
              }
  
              return getLocaleString(defaultLocale, separator);
          }
  
          if (value instanceof String) {
              return (String) value;
          }
          else if (value instanceof Locale) {
              return getLocaleString((Locale) value, separator);
          }
          else {
              throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
                          "Wrong type: '" + value.getClass().getSimpleName()
                                      + "' is not 'Locale'.",
                          Constants.EMPTY_STRING));
          }
      }
  
      public static Locale getLocaleObject(final String locale, final char seperator) {
          String replacedLocale = locale;
          if (seperator != '-' && seperator != '_') {
              replacedLocale = replacedLocale.replace(seperator, '_');
          }
  
          replacedLocale = replacedLocale.replace('-', '_');
  
          final String[] parts = replacedLocale.split("_");
          if (parts.length == 0
                      || !parts[0].matches("[a-zA-Z]{2,2}")
                      || parts.length > 1 && parts[1].length() != 0 && !parts[1].matches("[a-zA-Z]{2,2}")) {
              throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
                          "'" + locale + "' does not represent a valid locale",
                         Constants.EMPTY_STRING));
         }
 
         switch (parts.length) {
             case 3:
                 return new Locale(parts[0], parts[1], parts[2]);
 
             case 2:
                 return new Locale(parts[0], parts[1]);
 
             case 1:
                 return new Locale(parts[0]);
 
             default:
                 final String[] arr = ExtLangUtils.subarray(parts, 2, parts.length);
                 return new Locale(parts[0], parts[1], String.join("_", arr));
         }
     }
 
     public static String getLocaleString(final Locale locale, final char seperator) {
         if (LangUtils.isBlank(locale.getCountry())) {
             return locale.getLanguage();
         }
 
         return locale.getLanguage() + seperator + locale.getCountry();
     }
 
     public char getSeparator() {
         return separator;
     }
 
     public void setSeparator(final char separator) {
         this.separator = separator;
     }
 }