/*
    * 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.example.demo;
  
  import org.apache.myfaces.tobago.internal.util.ObjectUtils;
  import org.apache.myfaces.tobago.internal.util.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.enterprise.context.SessionScoped;
  import javax.enterprise.event.Event;
  import javax.faces.application.Application;
  import javax.faces.application.FacesMessage;
  import javax.faces.component.UIViewRoot;
  import javax.faces.context.FacesContext;
  import javax.faces.model.SelectItem;
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.servlet.ServletContext;
  import java.io.Serializable;
  import java.lang.invoke.MethodHandles;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  
  @Named
  @SessionScoped
  public class LocaleController implements Serializable {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    private Locale locale;
  
    @Inject
    private Event<LocaleChanged> events;
  
    public LocaleController() {
  
      final FacesContext facesContext = FacesContext.getCurrentInstance();
  
      // locale
  
      final UIViewRoot viewRoot = facesContext.getViewRoot();
      if (viewRoot != null) {
        locale = viewRoot.getLocale();
      } else {
        locale = facesContext.getApplication().getDefaultLocale();
      }
    }
  
    public String submit() {
      if (LOG.isDebugEnabled()) {
        LOG.debug("submit locale");
      }
      final FacesContext facesContext = FacesContext.getCurrentInstance();
      final UIViewRoot viewRoot = facesContext.getViewRoot();
      if (viewRoot != null) {
        return viewRoot.getViewId();
      } else {
        facesContext.addMessage(null,
            new FacesMessage(FacesMessage.SEVERITY_WARN, "ViewRoot not found!", null));
        return Outcome.CONCEPT_LOCALE.toString();
      }
    }
  
  // ///////////////////////////////////////////// logic
  
    public List<SelectItem> getLocaleItems() {
      final FacesContext facesContext = FacesContext.getCurrentInstance();
      final Application application = facesContext.getApplication();
      final Locale defaultLocale = application.getDefaultLocale();
      final Iterator supportedLocales = application.getSupportedLocales();
  
      boolean defaultInList = false;
      final List<SelectItem> localeItems = new ArrayList<>();
      while (supportedLocales.hasNext()) {
        final Locale supported = (Locale) supportedLocales.next();
        localeItems.add(createLocaleItem(supported));
        if (supported.equals(defaultLocale)) {
         defaultInList = true;
       }
     }
     // If the default is already in the list, don't add it.
     // Background: Must the default be in the supported list? Yes or No?
     // This question is not specified explicit and different implemented in the RI and MyFaces
     if (!defaultInList && defaultLocale != null) {
       localeItems.add(0, createLocaleItem(defaultLocale));
     }
     return localeItems;
   }
 
   private SelectItem createLocaleItem(final Locale localeItem) {
     if (locale != null) {
       return new SelectItem(localeItem, localeItem.getDisplayName(locale));
     } else {
       return new SelectItem(localeItem, localeItem.getDisplayName(localeItem));
     }
   }
 
   public Locale getLocale() {
     return locale;
   }
 
   public String getLocalizedLocale() {
     if (locale != null) {
       return locale.getDisplayName(locale);
     } else {
       return null;
     }
   }
 
   public String getImageCountryName() {
     final String language = locale.getLanguage();
     final String country = locale.getCountry();
     final String suffix
         = StringUtils.isNotBlank(language) && StringUtils.isNotBlank(country) ? "_" + language + "_" + country : "";
     String url = "/image/country" + suffix + ".png";
     final ServletContext servletContext =
         (ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext();
     URL resource = null;
     try {
       resource = servletContext.getResource(url);
     } catch (final MalformedURLException e) {
       // ignore
     }
     if (resource == null) {
       url = "/image/country.png";
     }
     return url;
   }
 
   public void setLocale(final Locale locale) {
     if (!ObjectUtils.equals(this.locale, locale)) {
       events.fire(new LocaleChanged());
     }
     this.locale = locale;
   }
 
 }