@POST
  @Consumes("application/x-www-form-urlencoded")
  @Produces("text/html")
  public String putResponse(
      @FormParam("attendeeResponse") String userResponse,
      @PathParam("eventId") Long eventId,
      @PathParam("inviteId") Long personId) {
    StringBuilder output = new StringBuilder();
    Response response =
        (Response)
            em.createNamedQuery("rsvp.entity.Response.findResponseByEventAndPerson")
                .setParameter("eventId", eventId)
                .setParameter("personId", personId)
                .getSingleResult();
    Event event = response.getEvent();
    Person person = response.getPerson();

    if (userResponse.equals("Yes") && !response.getResponse().equals(ResponseEnum.ATTENDING)) {
      response.setResponse(ResponseEnum.ATTENDING);
      em.merge(response);
    } else if (userResponse.equals("No")
        && !response.getResponse().equals(ResponseEnum.NOT_ATTENDING)) {
      response.setResponse(ResponseEnum.NOT_ATTENDING);
      em.merge(response);
    } else if (userResponse.equals("Maybe")
        && !response.getResponse().equals(ResponseEnum.MAYBE_ATTENDING)) {
      response.setResponse(ResponseEnum.MAYBE_ATTENDING);
      em.merge(response);
    }

    // create the response HTML
    output
        .append("<html lang=\"en\"><head><title>Current response for ")
        .append(person.getFirstName())
        .append(" ")
        .append(person.getLastName())
        .append(" at ")
        .append(event.getName())
        .append("</title>")
        .append("<link href=\"/rsvp/css/default.css\" rel=\"stylesheet\" type=\"text/css\" />")
        .append("</head>");
    output.append("<body><h1>").append(event.getName()).append("</h1>");
    output
        .append("<p>Thanks for your RSVP, ")
        .append(person.getFirstName())
        .append(" ")
        .append(person.getLastName())
        .append("!</p>");
    output
        .append("<p>Your current response is: ")
        .append(response.getResponseText())
        .append("</p>");
    output
        .append("<p><a href=\"/jaxrs_rsvp_db/resources/status/")
        .append(event.getId())
        .append("\">Back to event page</a></p>");
    output.append("</body></html>");

    return output.toString();
  }
  @GET
  @Produces("text/html")
  public String getResponse(
      @PathParam("eventId") Long eventId, @PathParam("inviteId") Long personId) {
    StringBuilder output = new StringBuilder();
    Response response =
        (Response)
            em.createNamedQuery("rsvp.entity.Response.findResponseByEventAndPerson")
                .setParameter("eventId", eventId)
                .setParameter("personId", personId)
                .getSingleResult();
    Event event = response.getEvent();
    Person person = response.getPerson();
    output
        .append("<html lang=\"en\"><head><title>Current response for ")
        .append(person.getFirstName())
        .append(" ")
        .append(person.getLastName())
        .append(" at ")
        .append(event.getName())
        .append("</title>")
        .append("<link href=\"/rsvp/css/default.css\" rel=\"stylesheet\" type=\"text/css\" />")
        .append("</head>");
    output.append("<body><h1>").append(event.getName()).append("</h1>");
    output.append("<p>Hello ").append(person.getFirstName()).append("!</p>");
    output.append("<p>");
    output.append("Your current response is: ").append(response.getResponseText());
    output.append("</p>");

    output
        .append("<form name=\"submitResponse\" action=\"/jaxrs_rsvp_db/resources/")
        .append(event.getId())
        .append("/")
        .append(person.getId())
        .append("\" method=\"POST\">");
    output.append("<p>Will you attend ").append(event.getName()).append("?</p>");
    output.append("<select title=\"Response\" name=\"attendeeResponse\">");
    output.append("<option>Yes</option>");
    output.append("<option>Maybe</option>");
    output.append("<option>No</option>");
    output.append("</select>");
    output.append("<br/>");
    output.append(
        "<input type=\"submit\" value=\"Submit response\" name=\"attendeeResponseButton\"/>");
    output.append("</form>");

    output.append("</body></html>");

    return output.toString();
  }