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 "";

                 }

         }

 }