package usecase.auth;
   
   import common.http.interceptor.InterceptableServlet;
   
   import javax.inject.Inject;
   import javax.servlet.ServletException;
   import javax.servlet.annotation.WebServlet;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  import java.util.Optional;
  
  /**
   * Servlet dedicata alle operazioni di login.
   */
  @WebServlet("/login")
  class LoginServlet extends InterceptableServlet {
      @Inject AuthenticationService authenticationService;
      @Inject CurrentUser currentUser;
  
      @Override
      protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
          if(currentUser.isLoggedIn())
              resp.sendRedirect(req.getContextPath());
          else
              req.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(req, resp);
      }
  
      @Override
      protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
          if(currentUser.isLoggedIn()){
              resp.sendRedirect(req.getContextPath());
              return;
          }
  
          String username = Optional.ofNullable(req.getParameter("username")).orElse("");
          String password = Optional.ofNullable(req.getParameter("pass")).orElse("");
  
          boolean loginSuccessful = authenticationService.authenticate(username, password);
  
          if(loginSuccessful)
              resp.sendRedirect(req.getContextPath());
          else
              req.getRequestDispatcher("/WEB-INF/views/login.jsp?error").forward(req, resp);
      }
  }