/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.frontend.jersey.resources;
  
  import java.util.Set;
  
  import org.mycore.common.MCRJSONUtils;
  import org.mycore.common.MCRSessionMgr;
  import org.mycore.frontend.MCRFrontendUtil;
  import org.mycore.frontend.jersey.MCRJerseyUtil;
  import org.mycore.frontend.jersey.MCRStaticContent;
  import org.mycore.services.i18n.MCRTranslation;
  
  import jakarta.annotation.PostConstruct;
  import jakarta.servlet.ServletContext;
  import jakarta.servlet.http.HttpServletResponse;
  import jakarta.ws.rs.GET;
  import jakarta.ws.rs.Path;
  import jakarta.ws.rs.PathParam;
  import jakarta.ws.rs.Produces;
  import jakarta.ws.rs.core.Context;
  import jakarta.ws.rs.core.MediaType;
  
  @Path("locale")
  public class MCRLocaleResource {
  
      @Context
      private HttpServletResponse resp;
  
      @Context
      private ServletContext context;
  
      private long cacheTime, startUpTime;
  
      @PostConstruct
      public void init() {
          String cacheParam = context.getInitParameter("cacheTime");
          cacheTime = cacheParam != null ? Long.parseLong(cacheParam) : (60 * 60 * 24); //default is one day
          startUpTime = System.currentTimeMillis();
      }
  
      /**
       * Returns the current language in ISO 639 (two character) format.
       * 
       * @return current language as plain text
       */
      @GET
      @Produces(MediaType.TEXT_PLAIN)
      @Path("language")
      public String language() {
          return MCRTranslation.getCurrentLocale().getLanguage();
      }
  
      /**
       * Returns all available languages of the application. The codes are in ISO 639 (two character) format.
       * 
       * @return json array of all languages available
       */
      @GET
      @Produces(MCRJerseyUtil.APPLICATION_JSON_UTF8)
      @Path("languages")
      @MCRStaticContent
      public String languages() {
          Set<String> availableLanguages = MCRTranslation.getAvailableLanguages();
          return MCRJSONUtils.getJsonArray(availableLanguages).toString();
      }
  
      /**
       * Translates a set of keys to the given language.
       * 
       * @param lang desired language
       * @param key message key ending with an asterisk (e.g. component.classeditor.*)
       * @return json object containing all keys and their corresponding translation
       */
      @GET
      @Produces(MCRJerseyUtil.APPLICATION_JSON_UTF8)
      @Path("translate/{lang}/{key: .*\\*}")
      @MCRStaticContent
      public String translateJSON(@PathParam("lang") String lang, @PathParam("key") String key) {
          MCRFrontendUtil.writeCacheHeaders(resp, cacheTime, startUpTime, true);
          return MCRJSONUtils.getTranslations(key, lang);
      }
  
     /**
      * Translates a set of keys to the current language.
      *
      * @param key message key ending with an asterisk (e.g. component.classeditor.*)
      * @return json object containing all keys and their corresponding translation in current language
      */
     @GET
     @Produces(MCRJerseyUtil.APPLICATION_JSON_UTF8)
     @Path("translate/{key: .*\\*}")
     public String translateJSONDefault(@PathParam("key") String key) {
         MCRFrontendUtil.writeCacheHeaders(resp, cacheTime, startUpTime, true);
         return MCRJSONUtils.getTranslations(key.substring(0, key.length() - 1),
             MCRSessionMgr.getCurrentSession().getCurrentLanguage());
     }
 
     /**
      * Translates a single key to the given language.
      * 
      * @param lang desired language
      * @param key the key to translate (e.g. component.classeditor.save.successful)
      * @return translated plain text
      */
     @GET
     @Produces(MediaType.TEXT_PLAIN)
     @Path("translate/{lang}/{key: [^\\*]+}")
     @MCRStaticContent
     public String translateText(@PathParam("lang") String lang, @PathParam("key") String key) {
         MCRFrontendUtil.writeCacheHeaders(resp, cacheTime, startUpTime, true);
         return MCRTranslation.translate(key, MCRTranslation.getLocale(lang));
     }
 
     /**
      * Translates a single key to the current language.
      *
      * @param key the key to translate (e.g. component.classeditor.save.successful)
      * @return translated plain text
      */
     @GET
     @Produces(MediaType.TEXT_PLAIN)
     @Path("translate/{key: [^\\*]+}")
     public String translateTextDefault(@PathParam("key") String key) {
         MCRFrontendUtil.writeCacheHeaders(resp, cacheTime, startUpTime, true);
         return MCRTranslation.translate(key, MCRTranslation.getCurrentLocale());
     }
 
 }