/**
   * Displays a Discussion Thread page
   *
   * <p>- Requires a cookie for the session user - Requires a threadId request parameter for the
   * HTTP GET
   *
   * @param req The HTTP Request
   * @param res The HTTP Response
   */
  public void discussionAction(HttpServletRequest req, HttpServletResponse res) {
    // Ensure there is a cookie for the session user
    if (AccountController.redirectIfNoCookie(req, res)) return;

    Map<String, Object> viewData = new HashMap<>();

    if (req.getMethod() == HttpMethod.Get) {

      // Get the thread
      GroupManager gm = new GroupManager();
      int threadId = Integer.parseInt(req.getParameter("threadId"));
      DiscussionManager discussionManager = new DiscussionManager();
      DiscussionThread thread = discussionManager.getThread(threadId);
      thread.setGroup(gm.get(thread.getGroupId()));
      thread.setPosts(discussionManager.getPosts(threadId));

      // get documents for the thread
      DocumentManager docMan = new DocumentManager();
      viewData.put("documents", docMan.getDocumentsForThread(threadId));

      viewData.put("thread", thread);
      viewData.put("title", "Discussion: " + thread.getThreadName());
      view(req, res, "/views/group/DiscussionThread.jsp", viewData);
    } else {
      httpNotFound(req, res);
    }
  }