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/*
* Copyright 2013 Jesse Morgan
*/
package com.p4square.grow.frontend;
import java.util.Map;
import java.util.HashMap;
import freemarker.template.Template;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Status;
import org.restlet.ext.freemarker.TemplateRepresentation;
import org.restlet.representation.Representation;
import org.restlet.resource.ServerResource;
import org.apache.log4j.Logger;
import net.jesterpm.fmfacade.json.JsonRequestClient;
import net.jesterpm.fmfacade.json.JsonResponse;
import net.jesterpm.fmfacade.FreeMarkerPageResource;
import com.p4square.grow.config.Config;
/**
* SurveyPageResource handles rendering the survey and processing user's answers.
*
* This resource expects the user to be authenticated and the ClientInfo User object
* to be populated. Each question is requested from the backend along with the
* user's previous answer. Each answer is sent to the backend and the user is redirected
* to the next question. After the last question the user is sent to his results.
*
* @author Jesse Morgan <jesse@jesterpm.net>
*/
public class SurveyPageResource extends FreeMarkerPageResource {
private static Logger cLog = Logger.getLogger(SurveyPageResource.class);
private Config mConfig;
private Template mSurveyTemplate;
private JsonRequestClient mJsonClient;
// Fields pertaining to this request.
private String mQuestionId;
private String mUserId;
@Override
public void doInit() {
super.doInit();
GrowFrontend growFrontend = (GrowFrontend) getApplication();
mConfig = growFrontend.getConfig();
mSurveyTemplate = growFrontend.getTemplate("templates/survey.ftl");
if (mSurveyTemplate == null) {
cLog.fatal("Could not find survey template.");
setStatus(Status.SERVER_ERROR_INTERNAL);
}
mJsonClient = new JsonRequestClient(getContext().getClientDispatcher());
mQuestionId = getAttribute("questionId");
mUserId = getRequest().getClientInfo().getUser().getIdentifier();
}
/**
* Return a page with a survey question.
*/
@Override
protected Representation get() {
try {
// Get the current question.
if (mQuestionId == null) {
// TODO: Get user's current question
mQuestionId = "1";
}
Map questionData = null;
{
JsonResponse response = backendGet("/assessment/question/" + mQuestionId);
if (!response.getStatus().isSuccess()) {
setStatus(Status.CLIENT_ERROR_NOT_FOUND);
return null;
}
questionData = response.getMap();
}
// Get any previous answer to the question
String selectedAnswer = null;
{
JsonResponse response = backendGet("/accounts/" + mUserId + "/assessment/answers/" + mQuestionId);
if (response.getStatus().isSuccess()) {
selectedAnswer = (String) response.getMap().get("answerId");
}
}
Map root = getRootObject();
root.put("question", questionData);
root.put("selectedAnswerId", selectedAnswer);
return new TemplateRepresentation(mSurveyTemplate, root, MediaType.TEXT_HTML);
} catch (Exception e) {
cLog.fatal("Could not render page: " + e.getMessage(), e);
setStatus(Status.SERVER_ERROR_INTERNAL);
return null;
}
}
/**
* Record a survey answer and redirect to the next question.
*/
@Override
protected Representation post(Representation entity) {
final Form form = new Form(entity);
final String answerId = form.getFirstValue("answer");
if (mQuestionId == null || answerId == null || answerId.length() == 0) {
// Something is wrong.
setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
return null;
}
try {
// Find the question
Map questionData = null;
{
JsonResponse response = backendGet("/assessment/question/" + mQuestionId);
if (!response.getStatus().isSuccess()) {
// User is answering a question which doesn't exist
setStatus(Status.CLIENT_ERROR_NOT_FOUND);
return null;
}
questionData = response.getMap();
}
// Store answer
{
Map<String, String> answer = new HashMap<String, String>();
answer.put("answerId", answerId);
JsonResponse response = backendPut("/accounts/" + mUserId +
"/assessment/answers/" + mQuestionId, answer);
if (!response.getStatus().isSuccess()) {
// Something went wrong talking to the backend, error out.
cLog.fatal("Error recording survey answer " + response.getStatus());
setStatus(Status.SERVER_ERROR_INTERNAL);
return null;
}
}
// Find the next question or finish the assessment.
String nextPage = mConfig.getString("dynamicRoot", "");
{
String nextQuestionId = (String) questionData.get("nextQuestion");
if (nextQuestionId == null) {
nextPage += "/account/assessment/results";
} else {
nextPage += "/account/assessment/question/" + nextQuestionId;
}
}
getResponse().redirectSeeOther(nextPage);
return null;
} catch (Exception e) {
cLog.fatal("Could not render page: " + e.getMessage(), e);
setStatus(Status.SERVER_ERROR_INTERNAL);
return null;
}
}
/**
* @return The backend endpoint URI
*/
private String getBackendEndpoint() {
return mConfig.getString("backendUri", "riap://component/backend");
}
/**
* Helper method to send a GET to the backend.
*/
private JsonResponse backendGet(final String uri) {
cLog.debug("Sending backend GET " + uri);
final JsonResponse response = mJsonClient.get(getBackendEndpoint() + uri);
final Status status = response.getStatus();
if (!status.isSuccess() && !Status.CLIENT_ERROR_NOT_FOUND.equals(status)) {
cLog.warn("Error making backend request for '" + uri + "'. status = " + response.getStatus().toString());
}
return response;
}
protected JsonResponse backendPut(final String uri, final Map data) {
cLog.debug("Sending backend PUT " + uri);
final JsonResponse response = mJsonClient.put(getBackendEndpoint() + uri, data);
final Status status = response.getStatus();
if (!status.isSuccess() && !Status.CLIENT_ERROR_NOT_FOUND.equals(status)) {
cLog.warn("Error making backend request for '" + uri + "'. status = " + response.getStatus().toString());
}
return response;
}
}
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