in inclass quizzes server decides what is the next question

backend/src/main/java/pt/ulisboa/tecnico/socialsoftware/tutor/answer/AnswerService.java

@@ -1,5 +1,7 @@
 package pt.ulisboa.tecnico.socialsoftware.tutor.answer;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.retry.annotation.Backoff;
@@ -47,6 +49,8 @@
 
 @Service
 public class AnswerService {
+    private static final Logger logger = LoggerFactory.getLogger(AnswerService.class);
+
     @Autowired
     private Mailer mailer;
 
@@ -370,7 +374,10 @@ public StatementQuizDto getQuizByQRCode(int userId, int quizId) {
         QuizAnswer quizAnswer = getQuizAnswer(student, quiz);
 
         if (quiz.getAvailableDate() == null || DateHandler.now().isAfter(quiz.getAvailableDate())) {
-            return getPreparedStatementQuizDto(student, quiz, quizAnswer);
+            StatementQuizDto result = getPreparedStatementQuizDto(student, quiz, quizAnswer);
+            if (quiz.isOneWay() && quiz.getConclusionDate() != null)
+                logger.info("Student {} for quiz answer {} get quiz {} with sequence {}", student.getUsername(), quizAnswer.getId(), result);
+            return result;
         } else {  // Send timer
             StatementQuizDto quizDto = new StatementQuizDto();
             quizDto.setTimeToAvailability(ChronoUnit.MILLIS.between(DateHandler.now(), quiz.getAvailableDate()));
@@ -398,7 +405,10 @@ public StatementQuizDto startQuiz(int userId, int quizId) {
 
         QuizAnswer quizAnswer = getQuizAnswer(student, quiz);
 
-        return getPreparedStatementQuizDto(student, quiz, quizAnswer);
+        StatementQuizDto result = getPreparedStatementQuizDto(student, quiz, quizAnswer);
+        if (quiz.isOneWay() && quiz.getConclusionDate() != null)
+            logger.info("Student {} for quiz answer {} get quiz {} with sequence {}", student.getUsername(), quizAnswer.getId(), result);
+        return result;
     }
 
     private void commonChecks(Student student, Quiz quiz) {
@@ -481,16 +491,20 @@ public StatementQuestionDto getQuestionForQuizAnswer(Integer questionId, Stateme
         QuizAnswer quizAnswer = quizAnswerRepository.findById(answer.getQuizAnswerId())
                 .orElseThrow(() -> new TutorException(QUIZ_ANSWER_NOT_FOUND));
 
-        try {
-            quizAnswer.checkCanGetQuestion(questionId);
-        } catch (TutorException te) {
+        Integer sequenceQuestionId = quizAnswer.checkCorrectSequenceQuestion(answer.getSequence(), questionId);
+
+        if (!sequenceQuestionId.equals(questionId)) {
+            logger.info("Student of quiz answer {} tried to get question id {} with sequence {} but the correct question id is {}",
+                    quizAnswer.getId(), questionId, answer.getSequence() + 1, sequenceQuestionId);
+
             mailer.sendSimpleMail(mailUsername, "rito.silva@tecnico.ulisboa.pt",
                     Mailer.QUIZZES_TUTOR_SUBJECT + " Alert", "In course "
                             + quizAnswer.getQuiz().getCourseExecution().getCourse().getName()
-                            + ", the following behavior was detected but the student *was not able* to answer questions out of the predefined order: "
-                            + te.getMessage());
+                            + ", the student tried to get a sequence-question (" + answer.getSequence() + "," + questionId + ")"
+                            + " out of the predefined order but the correct question is " + sequenceQuestionId);
         }
-        Question question = questionRepository.findById(questionId)
+
+        Question question = questionRepository.findById(sequenceQuestionId)
                 .orElseThrow(() -> new TutorException(QUESTION_NOT_FOUND, questionId));
 
         return new StatementQuestionDto(question);
@@ -509,7 +523,7 @@ public void submitAnswer(String username, int quizId, StatementAnswerDto answer)
         } catch (TutorException te) {
             for (Teacher teacher : quizAnswer.getQuiz().getCourseExecution().getTeachers()) {
                 mailer.sendSimpleMail(mailUsername, teacher.getEmail(),
-                        Mailer.QUIZZES_TUTOR_SUBJECT + " Alert", "The following behavior was detected but the student *was not able* to answer questions out of the predefined order: " + te.getMessage());
+                        Mailer.QUIZZES_TUTOR_SUBJECT + " Alert", "The student tried to answer questions out of the predefined order: " + te.getMessage());
             }
 
             throw te;

backend/src/main/java/pt/ulisboa/tecnico/socialsoftware/tutor/answer/domain/QuizAnswer.java

@@ -14,6 +14,7 @@
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -84,10 +85,13 @@ public QuizAnswer(Student student, Quiz quiz) {
 
         for (int i = 0; i < quizQuestions.size(); i++) {
             new QuestionAnswer(this, quizQuestions.get(i), i);
+        }
 
-            if (quiz.isOneWay() && quiz.getType().equals(Quiz.QuizType.IN_CLASS)) {
-                this.questionIds.add(quizQuestions.get(i).getQuestion().getId());
-            }
+        if (quiz.isOneWay() && quiz.getType().equals(Quiz.QuizType.IN_CLASS)) {
+            questionIds = getQuestionAnswers().stream()
+                    .sorted(Comparator.comparing(QuestionAnswer::getSequence))
+                    .map(questionAnswer -> questionAnswer.getQuestion().getId())
+                    .collect(Collectors.toList());
         }
     }
 
@@ -218,20 +222,19 @@ public void calculateQuestionStatistics() {
         }
     }
 
-    public void checkCanGetQuestion(Integer questionId) {
+    public Integer checkCorrectSequenceQuestion(Integer sequence, Integer questionId) {
         if (!questionIds.isEmpty()) {
-            if (currentSequenceQuestion < questionIds.size() - 1
-                    && questionIds.get(currentSequenceQuestion + 1).equals(questionId)) {
-                currentSequenceQuestion = currentSequenceQuestion + 1;
-
-                logger.info("Student {} for quiz answer {} get question id {} with sequence {}", getStudent().getUsername(), getId(), questionId, currentSequenceQuestion);
-            } else if (!questionIds.get(currentSequenceQuestion).equals(questionId)) {
-                throw new TutorException(INVALID_QUIZ_ANSWER_SEQUENCE,
-                        getStudent().getUsername() + " tried to get question with ID "
-                                + questionId + " when they sequence is " + (currentSequenceQuestion + 1)
-                                + " and the question IDs sequence is " + questionIds.stream().map(String::valueOf).collect(Collectors.joining(", ")));
+            if (sequence.equals(currentSequenceQuestion + 1)) {
+                currentSequenceQuestion = sequence;
             }
+
+            logger.info("Student {} for quiz answer {} get question id {} with sequence {}", getStudent().getUsername(), getId(), questionId, (currentSequenceQuestion + 1));
+            logger.info("Question ids {}", questionIds);
+
+            return questionIds.get(currentSequenceQuestion);
         }
+
+        return questionId;
     }
 
     public void checkIsCurrentQuestion(Integer questionId) {

backend/src/main/java/pt/ulisboa/tecnico/socialsoftware/tutor/answer/dto/StatementAnswerDto.java

@@ -9,12 +9,19 @@
 
 public class StatementAnswerDto implements Serializable {
     private Integer timeTaken;
+
     private Integer timeToSubmission;
+
     private Integer sequence;
+
     private Integer quizAnswerId;
+
     private Integer questionAnswerId;
+
     private Integer questionId;
+
     private Integer quizQuestionId;
+
     private DiscussionDto userDiscussion;
 
     private StatementAnswerDetailsDto answerDetails;
@@ -32,8 +39,8 @@ public StatementAnswerDto(QuestionAnswer questionAnswer) {
 
         this.answerDetails = questionAnswer.getStatementAnswerDetailsDto();
 
-        if (questionAnswer.getDiscussion() != null){
-            this.userDiscussion = new DiscussionDto(questionAnswer.getDiscussion(),false);
+        if (questionAnswer.getDiscussion() != null) {
+            this.userDiscussion = new DiscussionDto(questionAnswer.getDiscussion(), false);
         }
     }
 
@@ -93,7 +100,7 @@ public void setTimeToSubmission(Integer timeToSubmission) {
         this.timeToSubmission = timeToSubmission;
     }
 
-    public AnswerDetails getAnswerDetails(QuestionAnswer questionAnswer){
+    public AnswerDetails getAnswerDetails(QuestionAnswer questionAnswer) {
         return this.getAnswerDetails() != null ? this.answerDetails.getAnswerDetails(questionAnswer) : null;
     }
 
@@ -117,10 +124,13 @@ public void setUserDiscussion(DiscussionDto userDiscussion) {
     public String toString() {
         return "StatementAnswerDto{" +
                 "timeTaken=" + timeTaken +
+                ", timeToSubmission=" + timeToSubmission +
                 ", sequence=" + sequence +
+                ", quizAnswerId=" + quizAnswerId +
                 ", questionAnswerId=" + questionAnswerId +
+                ", questionId=" + questionId +
                 ", quizQuestionId=" + quizQuestionId +
-                ", timeToSubmission=" + timeToSubmission +
+                ", userDiscussion=" + userDiscussion +
                 ", answerDetails=" + answerDetails +
                 '}';
     }

backend/src/main/java/pt/ulisboa/tecnico/socialsoftware/tutor/answer/dto/StatementQuestionDto.java

@@ -9,8 +9,11 @@
 
 public class StatementQuestionDto implements Serializable {
     private String content;
+
     private ImageDto image;
+
     private Integer sequence;
+
     private Integer questionId;
 
     private StatementQuestionDetailsDto questionDetails;
@@ -36,6 +39,8 @@ public StatementQuestionDto(Question question) {
             this.image = new ImageDto(question.getImage());
 
         this.questionDetails = question.getStatementQuestionDetailsDto();
+
+        this.questionId = question.getId();
     }
 
     public String getContent() {
@@ -76,6 +81,7 @@ public String toString() {
                 "content='" + content + '\'' +
                 ", image=" + image +
                 ", sequence=" + sequence +
+                ", questionId=" + questionId +
                 ", questionDetails=" + questionDetails +
                 '}';
     }

backend/src/main/java/pt/ulisboa/tecnico/socialsoftware/tutor/answer/dto/StatementQuizDto.java

@@ -19,19 +19,31 @@
 
 public class StatementQuizDto implements Serializable {
     private Integer id;
+
     private Integer quizAnswerId;
+
     private String title;
+
     private boolean oneWay;
+
     private boolean timed;
+
     private String availableDate;
+
     private String conclusionDate;
+
     private Integer questionOrder = 0;
+
     private Long timeToAvailability;
+
     private Long timeToSubmission;
+
     private List<StatementQuestionDto> questions = new ArrayList<>();
+
     private List<StatementAnswerDto> answers = new ArrayList<>();
 
-    public StatementQuizDto() {}
+    public StatementQuizDto() {
+    }
 
     public StatementQuizDto(QuizAnswer quizAnswer, boolean complete) {
         this.id = quizAnswer.getQuiz().getId();
@@ -64,7 +76,7 @@ public StatementQuizDto(QuizAnswer quizAnswer, List<QuestionAnswerItem> items) {
 
         List<QuestionAnswerItem> finalItems = new ArrayList<>();
         for (int i = 0; i < items.size() - 1; i++) {
-            if (!items.get(i).getQuizQuestionId().equals(items.get(i+1).getQuizQuestionId())) {
+            if (!items.get(i).getQuizQuestionId().equals(items.get(i + 1).getQuizQuestionId())) {
                 finalItems.add(items.get(i));
             }
         }
@@ -185,8 +197,10 @@ public String toString() {
                 ", quizAnswerId=" + quizAnswerId +
                 ", title='" + title + '\'' +
                 ", oneWay=" + oneWay +
+                ", timed=" + timed +
                 ", availableDate='" + availableDate + '\'' +
                 ", conclusionDate='" + conclusionDate + '\'' +
+                ", questionOrder=" + questionOrder +
                 ", timeToAvailability=" + timeToAvailability +
                 ", timeToSubmission=" + timeToSubmission +
                 ", questions=" + questions +

frontend/src/views/student/quiz/QuizView.vue

@@ -197,6 +197,10 @@ export default class QuizView extends Vue {
         this.statementQuiz.questions[order].image = question.image;
         this.statementQuiz.questions[order].questionDetails =
           question.questionDetails;
+
+        // ensure that the questions ids are equal to que returned by the server
+        this.statementQuiz.questions[order].questionId = question.questionId;
+        this.statementQuiz.answers[order].questionId = question.questionId;
       } catch (error) {
         await this.$store.dispatch('error', error);
         await this.$router.push({ name: 'available-quizzes' });