/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * 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
    *
    *         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.argeo.cms.ui.widgets.auth;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Locale;
  
  import javax.security.auth.callback.LanguageCallback;
  
  import org.argeo.cms.CmsException;
  import org.argeo.cms.LocaleUtils;
  
  /** Choose in a list of locales. TODO: replace with {@link LanguageCallback} */
  public class LocaleChoice {
  	private final List<Locale> locales;
  
  	private Integer selectedIndex = null;
  	private final Integer defaultIndex;
  
  	public LocaleChoice(List<Locale> locales, Locale defaultLocale) {
  		Integer defaultIndex = null;
  		this.locales = Collections.unmodifiableList(locales);
  		for (int i = 0; i < locales.size(); i++)
  			if (locales.get(i).equals(defaultLocale))
  				defaultIndex = i;
  
  		// based on language only
  		if (defaultIndex == null)
  			for (int i = 0; i < locales.size(); i++)
  				if (locales.get(i).getLanguage().equals(defaultLocale.getLanguage()))
  					defaultIndex = i;
  
  		if (defaultIndex == null)
  			throw new CmsException("Default locale " + defaultLocale + " is not in available locales " + locales);
  		this.defaultIndex = defaultIndex;
  
  		this.selectedIndex = defaultIndex;
  	}
  
  	/**
  	 * Convenience constructor based on a comma separated list of iso codes (en,
  	 * en_US, fr_CA, etc.). Default selection is default locale.
  	 */
  	public LocaleChoice(String locales, Locale defaultLocale) {
  		this(LocaleUtils.asLocaleList(locales), defaultLocale);
  	}
  
  	public String[] getSupportedLocalesLabels() {
  		String[] labels = new String[locales.size()];
  		for (int i = 0; i < locales.size(); i++) {
  			Locale locale = locales.get(i);
  			if (locale.getCountry().equals(""))
  				labels[i] = locale.getDisplayLanguage(locale) + " [" + locale.getLanguage() + "]";
  			else
  				labels[i] = locale.getDisplayLanguage(locale) + " (" + locale.getDisplayCountry(locale) + ") ["
  						+ locale.getLanguage() + "_" + locale.getCountry() + "]";
  
  		}
  		return labels;
  	}
  
  	public Locale getSelectedLocale() {
  		if (selectedIndex == null)
  			return null;
  		return locales.get(selectedIndex);
  	}
  
  	public void setSelectedIndex(Integer selectedIndex) {
  		this.selectedIndex = selectedIndex;
  	}
  
  	public Integer getSelectedIndex() {
  		return selectedIndex;
  	}
  
  	public Integer getDefaultIndex() {
  		return defaultIndex;
  	}
  
  	public List<Locale> getLocales() {
  		return locales;
  	}
  
  	public Locale getDefaultLocale() {
  		return locales.get(getDefaultIndex());
 	}
 }