# SessionlessTranslationManager.java

    /*
     ** Module   : SessionlessTranslationManager.java
     ** Abstract : Translation manager for the FWD server when no client session available.
     **
     ** Copyright (c) 2023, Golden Code Development Corporation.
     **
     ** -#- -I- --Date-- ------------------------------------Description-------------------------------------------
     ** 001 GBB 20230915 Created the first version.
     */
    /*
     ** This program is free software: you can redistribute it and/or modify
     ** it under the terms of the GNU Affero General Public License as
     ** published by the Free Software Foundation, either version 3 of the
     ** License, or (at your option) any later version.
     **
     ** This program is distributed in the hope that it will be useful,
     ** but WITHOUT ANY WARRANTY; without even the implied warranty of
     ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     ** GNU Affero General Public License for more details.
     **
     ** You may find a copy of the GNU Affero GPL version 3 at the following
     ** location: https://www.gnu.org/licenses/agpl-3.0.en.html
     **
     ** Additional terms under GNU Affero GPL version 3 section 7:
     **
     **   Under Section 7 of the GNU Affero GPL version 3, the following additional
     **   terms apply to the works covered under the License.  These additional terms
     **   are non-permissive additional terms allowed under Section 7 of the GNU
     **   Affero GPL version 3 and may not be removed by you.
     **
     **   0. Attribution Requirement.
     **
     **     You must preserve all legal notices or author attributions in the covered
     **     work or Appropriate Legal Notices displayed by works containing the covered
     **     work.  You may not remove from the covered work any author or developer
     **     credit already included within the covered work.
     **
     **   1. No License To Use Trademarks.
     **
     **     This license does not grant any license or rights to use the trademarks
     **     Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
     **     of Golden Code Development Corporation. You are not authorized to use the
     **     name Golden Code, FWD, or the names of any author or contributor, for
     **     publicity purposes without written authorization.
     **
     **   2. No Misrepresentation of Affiliation.
     **
     **     You may not represent yourself as Golden Code Development Corporation or FWD.
     **
     **     You may not represent yourself for publicity purposes as associated with
     **     Golden Code Development Corporation, FWD, or any author or contributor to
     **     the covered work, without written authorization.
     **
     **   3. No Misrepresentation of Source or Origin.
     **
     **     You may not represent the covered work as solely your work.  All modified
     **     versions of the covered work must be marked in a reasonable way to make it
     **     clear that the modified work is not originating from Golden Code Development
     **     Corporation or FWD.  All modified versions must contain the notices of
     **     attribution required in this license.
     */

    package com.goldencode.p2j.translation;

    import com.goldencode.p2j.util.*;
    import com.goldencode.p2j.util.logging.*;

    import java.io.*;
    import java.util.*;
    import java.util.stream.*;

    /** Translation manager for the FWD runtime */
    public class SessionlessTranslationManager
    {
       /** Current languages set in directory */
       public static final String CURRENT_LANGUAGES_CONFIG;

       /** Current languages set in directory */
       private static final List<String> CURRENT_LANGUAGES;

       /** Default directory with translation resources, found in classpath */
       private static final String DEFAULT_TRANSLATIONS_DIR =
          "/" + SessionlessTranslationManager.class.getPackage().getName().replace('.', '/') + "/";

       /** Custom package directory with translation resources, found in classpath */
       private static final String CUSTOM_TRANSLATIONS_DIR = Utils.getLegacyPkgRootAsJarPath() + "translation/";

       /** Logger */
       private static final CentralLogger LOG = CentralLogger.get(SessionlessTranslationManager.class);

       /** Locale / Language map to the corresponding bundles with translated texts */
       private Map<String, ResourceBundle> translationsBundles = new HashMap<>();

       /** Default language translations bundle */
       private ResourceBundle defaultTranslationsBundle;

       /** Bundle name */
       private String bundleName;

       static
       {
          CURRENT_LANGUAGES_CONFIG = Utils.getDirectoryNodeString(null, "currentLanguage", null);
          CURRENT_LANGUAGES = CURRENT_LANGUAGES_CONFIG == null ? new ArrayList<>() :
             Arrays.stream(CURRENT_LANGUAGES_CONFIG.split(","))
                   .map(String::trim)
                   .collect(Collectors.toList());
       }

       /**
        * Public constructor for RuntimeTranslationManager.
        *
        * @param    bundleName
        *           The name of the bundle.
        */
       public SessionlessTranslationManager(String bundleName)
       {
          this.bundleName = bundleName;
          defaultTranslationsBundle = loadBundle(bundleName);
       }

       /**
        * Getter for {@link #CURRENT_LANGUAGES}
        *
        * @return   See above.
        */
       public static List<String> getCurrentLanguages()
       {
          return CURRENT_LANGUAGES;
       }

       /**
        * Returns the translated text.
        *
        * @param    key
        *           The key to find translated text for.
        *
        * @return   See above.
        */
       public String translate(String key)
       {
          String translatedText = null;
          ResourceBundle bundle = null;

          // TODO: accept requestedLang as an arg
          // TODO: map the locale from request.getHeader(HttpHeader.ACCEPT_LANGUAGE.asString()) to
          //  currentLanguage from directory
          String requestedLang = CURRENT_LANGUAGES.size() > 0 ? CURRENT_LANGUAGES.get(0) : null;

          if (CURRENT_LANGUAGES.contains(requestedLang))
          {
             if (!translationsBundles.containsKey(requestedLang))
             {
                translationsBundles.put(requestedLang, loadBundle(bundleName + "_" + requestedLang));
             }
             bundle = translationsBundles.get(requestedLang);
          }

          if (bundle != null)
          {
             try
             {
                translatedText = bundle.getString(key);
             }
             catch (Throwable ignored)
             {
             }
          }

          if (defaultTranslationsBundle != null && translatedText == null)
          {
             try
             {
                translatedText = defaultTranslationsBundle.getString(key);
             }
             catch (Throwable ignored)
             {
             }
          }
          return translatedText == null ? key : translatedText;
       }

       /**
        * Returns the loaded bundle.
        *
        * @param    bundleName
        *           The name of the bundle to load.
        *
        * @return   See above.
        */
       private ResourceBundle loadBundle(String bundleName)
       {
          try
          {
             InputStream inputStream = getClass().getResourceAsStream(
                CUSTOM_TRANSLATIONS_DIR + bundleName + ".properties");

             if (inputStream == null)
             {
                inputStream = getClass().getResourceAsStream(
                   DEFAULT_TRANSLATIONS_DIR + bundleName + ".properties");
             }
             return new PropertyResourceBundle(inputStream);
          }
          catch (Throwable e)
          {
             LOG.warning("Can't load translations bundle " + bundleName);
          }
          return null;
       }
    }