package at.gv.egiz.pdfas.web.i18n;

import java.io.IOException;
import java.util.Locale;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

public class SetLanguageServlet extends HttpServlet {
   
   private static final long serialVersionUID = 1L;
   
   public static final String LANGUAGE_PARAMETER = "code";
   private Logger log = Logger.getLogger(LanguageDecoratorMapper.class);

   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      this.doPost(request, response);
   }

   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      
      HttpSession session = request.getSession();
      
      // check manual language override (should be two-letter ISO-639 code)
      Locale currentManualSetLanguage = (Locale) session.getAttribute(LanguageDecoratorMapper.LOCALE_SESSION_KEY);
      String language = request.getParameter(LANGUAGE_PARAMETER);
      if (!StringUtils.isEmpty(language)) {
         String code = language.trim().toLowerCase();
         if (!ArrayUtils.contains(Locale.getISOLanguages(), code)) {
            log.error("Manually set language code \"" + code + "\" is not a valid ISO 639 language. Do not switch language.");
         } else {
            currentManualSetLanguage = new Locale(code);
            log.info("Switching language to " + currentManualSetLanguage.getDisplayLanguage() + ".");
            session.setAttribute(LanguageDecoratorMapper.LOCALE_SESSION_KEY, currentManualSetLanguage);
         }
      }

//      if (currentManualSetLanguage != null) {
//         log.info("Forcing language " + currentManualSetLanguage.getDisplayLanguage() + ".");
//         super.getServletContext().setAttribute(LanguageDecoratorMapper.LOCALE_SESSION_KEY, currentManualSetLanguage);
//      }
      
//      response.sendRedirect(response.encodeRedirectURL(request.getContextPath() + "/"));
      RequestDispatcher rd = request.getRequestDispatcher("/");
      rd.forward(request, response);
      
   }
   
   

}