package com.nilhcem.fakesmtp.core;
   
   import java.util.Locale;
   import java.util.MissingResourceException;
   import java.util.ResourceBundle;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   /**
   * Initializes resource bundle and get messages from keys.
   * <p>
   * This class will be instantiated only once and will use the JVM's default locale.
   * </p>
   *
   * @author Nilhcem
   * @since 1.0
   */
  public enum I18n {
  	INSTANCE;
  
  	public static final String UTF8 = "UTF-8";
  	private static final String RESOURCE_FILE = "i18n/messages";
  	private final Logger logger = LoggerFactory.getLogger(I18n.class);
  	private final ResourceBundle resources;
  
  	/**
  	 * Initializes resource bundle with the JVM's default locale.
  	 * <p>
  	 * If the JVM's default locale doesn't have any resource file, will take the en_US resources instead.
  	 * </p>
  	 */
  	I18n() {
  		ResourceBundle bundle;
  
  		try {
  			bundle = ResourceBundle.getBundle(I18n.RESOURCE_FILE, Locale.getDefault());
  		} catch (MissingResourceException mre) {
  			logger.error("{}", mre.getMessage());
  			logger.info("Will use default bundle (en_US) instead");
  			bundle = ResourceBundle.getBundle(I18n.RESOURCE_FILE, Locale.US);
  		}
  		resources = bundle;
  	}
  
  	/**
  	 * Returns the resource for the key passed in parameters.
  	 * <p>
  	 * If the key is not found, returns an empty string.
  	 * </p>
  	 *
  	 * @param key a String representing the key we want to get the resource from.
  	 * @return The text corresponding to the key passed in parameters, or an empty string if not found.
  	 */
  	public String get(String key) {
  		try {
  			return resources.getString(key);
  		} catch (MissingResourceException e) {
  			logger.error("{}", e.getMessage());
  			return "";
  		}
  	}
  }