package com.jsql.util;
   
   import org.apache.commons.lang3.StringUtils;
   import org.apache.logging.log4j.LogManager;
   import org.apache.logging.log4j.Logger;
   
   import java.net.URL;
   import java.util.Locale;
   import java.util.ResourceBundle;
  
  /**
   * Utility class managing different text translations like English, Chinese and Arabic.
   * It retrieves text in the current language of the system and also the one choice
   * manually by user.
   * If the current system language is not supported then the user is proposed to use
   * the community translation protocol.
   */
  public class I18nUtil {
      
      private static final Logger LOGGER = LogManager.getRootLogger();
      public static final String BASE_NAME = "i18n.jsql";
  
      /**
       * Bundle of standard i18n keys and translated text for root language English
       */
      public static final ResourceBundle BUNDLE_ROOT = ResourceBundle.getBundle(I18nUtil.BASE_NAME, Locale.ROOT);
      
      /**
       * Bundle of i18n keys and translated text for the current system language
       */
      private static ResourceBundle currentBundle = ResourceBundle.getBundle(I18nUtil.BASE_NAME, Locale.getDefault());
  
      private I18nUtil() {
          // Utility class
      }
      
      /**
       * Return the text corresponding to an i18n key in the properties.
       * @param key an i18n key in the properties
       * @return text corresponding to the key
       */
      public static String valueByKey(String key) {
          return I18nUtil.currentBundle.getString(key.replace(" ", "_"));  // e.g BLIND BINARY
      }
      
      /**
       * Verify if there is a language properties file corresponding to the current system language.
       * If not then it invites the user to use the translation process.
       */
      public static void checkCurrentLanguage() {
          URL path = I18nUtil.class.getClassLoader().getResource("i18n/jsql_"+ Locale.getDefault().getLanguage() +".properties");
          if (!"en".equals(Locale.getDefault().getLanguage()) && path == null) {
              String languageHost = Locale.getDefault().getDisplayLanguage(Locale.ENGLISH);
              LOGGER.log(
                  LogLevelUtil.CONSOLE_SUCCESS,
                  () -> String.join(
                      StringUtils.EMPTY,
                      "Contribute and translate parts of ", StringUtil.APP_NAME, " into ", languageHost, ": ",
                      "click on the top right button and open menu [Community], choose [I help translate jSQL into > another language...] and ",
                      "translate some text into ", languageHost, " then click on [Send]. Your translation will be integrated to the next release by the developer."
                  )
              );
          }
      }
      
      
      // Getters and setters
      
      public static void setCurrentBundle(Locale newLocale) {
          I18nUtil.currentBundle = ResourceBundle.getBundle(I18nUtil.BASE_NAME, newLocale);
      }
      
      public static Locale getCurrentLocale() {
          return I18nUtil.currentBundle.getLocale();
      }
  }