/**
    * This file Copyright (c) 2013 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.i18nsystem;
  
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.util.ClasspathResourcesUtil;
  import info.magnolia.i18nsystem.util.LocaleUtils;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.util.HashMap;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * Loads global message bundles from /mgnl-i18n/.
   */
  public class DefaultMessageBundlesLoader {
      private static final Logger log = LoggerFactory.getLogger(DefaultMessageBundlesLoader.class);
  
      private final Map<Locale, Properties> messages = new HashMap<Locale, Properties>();
  
      public DefaultMessageBundlesLoader() {
          loadMessages();
      }
  
      Map<Locale, Properties> getMessages() {
          return messages;
      }
  
      private void loadMessages() {
          final String[] propertiesFiles = ClasspathResourcesUtil.findResources(new ClasspathResourcesUtil.Filter() {
              @Override
              public boolean accept(String name) {
                  return name.startsWith("/mgnl-i18n/") && name.endsWith(".properties");
              }
          });
  
          for (String propertiesFile : propertiesFiles) {
              Reader inStream = null;
              try {
                  final String fileName = StringUtils.substringAfterLast(propertiesFile, "/");
                  Locale locale = resolveLocale(fileName);
  
                  log.debug("Loading properties file at [{}] with locale [{}]...", propertiesFile, locale);
                  inStream = new InputStreamReader(ClasspathResourcesUtil.getStream(propertiesFile), "UTF-8");
  
                  final Properties properties = new Properties();
                  properties.load(inStream);
                  Properties existingProperties = messages.get(locale);
  
                  if (existingProperties != null) {
                      // this locale already exists in our bundle, add the new ones
                      log.debug("Adding properties to already existing ones under {} locale", locale);
                      properties.putAll(existingProperties);
                  }
                  messages.put(locale, properties);
              } catch (IOException e) {
                  log.warn("An IO error occurred while trying to read properties file at [{}]", propertiesFile, e);
              } finally {
                  IOUtils.closeQuietly(inStream);
              }
          }
     }
 
     /**
      * @see {@link info.magnolia.i18nsystem.util.LocaleUtils#parseFromFilename(String, java.util.Locale)}
      */
     protected Locale resolveLocale(final String fileName) {
         return LocaleUtils.parseFromFilename(fileName, getFallbackLocale());
     }
 
     // TODO - move this to a SystemLocalesManager component
     private Locale getFallbackLocale() {
         return MessagesManager.getInstance().getDefaultLocale();
     }
 }