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/*
* Copyright 2013 Jesse Morgan
*/
package com.p4square.grow.backend.resources;
import java.util.Map;
import java.util.HashMap;
import com.netflix.astyanax.model.Column;
import com.netflix.astyanax.model.ColumnList;
import org.codehaus.jackson.map.ObjectMapper;
import org.restlet.data.MediaType;
import org.restlet.data.Status;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.resource.ServerResource;
import org.apache.log4j.Logger;
import com.p4square.grow.backend.GrowBackend;
import com.p4square.grow.backend.db.CassandraDatabase;
import com.p4square.grow.model.Answer;
import com.p4square.grow.model.Question;
import com.p4square.grow.model.RecordedAnswer;
import com.p4square.grow.model.Score;
import com.p4square.grow.provider.Provider;
/**
* Store the user's answers to the assessment and generate their score.
*
* @author Jesse Morgan <jesse@jesterpm.net>
*/
public class SurveyResultsResource extends ServerResource {
private static final Logger LOG = Logger.getLogger(SurveyResultsResource.class);
private static final ObjectMapper MAPPER = new ObjectMapper();
static enum RequestType {
ASSESSMENT, ANSWER
}
private CassandraDatabase mDb;
private Provider<String, Question> mQuestionProvider;
private RequestType mRequestType;
private String mUserId;
private String mQuestionId;
@Override
public void doInit() {
super.doInit();
final GrowBackend backend = (GrowBackend) getApplication();
mDb = backend.getDatabase();
mQuestionProvider = backend.getQuestionProvider();
mUserId = getAttribute("userId");
mQuestionId = getAttribute("questionId");
mRequestType = RequestType.ASSESSMENT;
if (mQuestionId != null) {
mRequestType = RequestType.ANSWER;
}
}
/**
* Handle GET Requests.
*/
@Override
protected Representation get() {
String result = null;
switch (mRequestType) {
case ANSWER:
result = mDb.getKey("assessments", mUserId, mQuestionId);
break;
case ASSESSMENT:
result = mDb.getKey("assessments", mUserId, "summary");
if (result == null) {
result = buildAssessment();
}
break;
}
if (result == null) {
setStatus(Status.CLIENT_ERROR_NOT_FOUND);
return null;
}
return new StringRepresentation(result);
}
/**
* Handle PUT requests
*/
@Override
protected Representation put(Representation entity) {
boolean success = false;
switch (mRequestType) {
case ANSWER:
try {
mDb.putKey("assessments", mUserId, mQuestionId, entity.getText());
mDb.putKey("assessments", mUserId, "lastAnswered", mQuestionId);
mDb.deleteKey("assessments", mUserId, "summary");
success = true;
} catch (Exception e) {
LOG.warn("Caught exception putting answer: " + e.getMessage(), e);
}
break;
default:
setStatus(Status.CLIENT_ERROR_METHOD_NOT_ALLOWED);
}
if (success) {
setStatus(Status.SUCCESS_NO_CONTENT);
} else {
setStatus(Status.SERVER_ERROR_INTERNAL);
}
return null;
}
/**
* This method compiles assessment results.
*/
private String buildAssessment() {
StringBuilder sb = new StringBuilder("{ ");
// Last question answered
final String lastAnswered = mDb.getKey("assessments", mUserId, "lastAnswered");
if (lastAnswered != null) {
sb.append("\"lastAnswered\": \"" + lastAnswered + "\"");
}
// Compute score
ColumnList<String> row = mDb.getRow("assessments", mUserId);
if (!row.isEmpty()) {
Score score = new Score();
boolean scoringDone = false;
int totalAnswers = 0;
for (Column<String> c : row) {
if (c.getName().equals("lastAnswered") || c.getName().equals("summary")) {
continue;
}
try {
Question question = mQuestionProvider.get(c.getName());
RecordedAnswer userAnswer = MAPPER.readValue(c.getStringValue(), RecordedAnswer.class);
if (question == null) {
LOG.warn("Answer for unknown question: " + c.getName());
continue;
}
LOG.error("Scoring questionId: " + c.getName());
scoringDone = !question.scoreAnswer(score, userAnswer);
} catch (Exception e) {
LOG.error("Failed to score question: {userid: \"" + mUserId +
"\", questionid:\"" + c.getName() +
"\", userAnswer:\"" + c.getStringValue() + "\"}", e);
}
totalAnswers++;
}
sb.append(", \"score\":" + score.getScore());
sb.append(", \"sum\":" + score.getSum());
sb.append(", \"count\":" + score.getCount());
sb.append(", \"totalAnswers\":" + totalAnswers);
sb.append(", \"result\":\"" + score.toString() + "\"");
}
sb.append(" }");
String summary = sb.toString();
// Persist summary
mDb.putKey("assessments", mUserId, "summary", summary);
return summary;
}
}
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