trait QuizResultAnswerEntityTrait in Quiz 8.6

trait QuizResultAnswerEntityTrait {

  /**
   * Get the question of this question response.
   *
   * @return QuizQuestion
   */
  public function getQuizQuestion() {
    return Drupal::entityTypeManager()
      ->getStorage('quiz_question')
      ->loadRevision($this
      ->get('question_vid')
      ->getString());
  }

  /**
   * Get the result of this question response.
   *
   * @return QuizResult
   */
  public function getQuizResult() {
    return Drupal::entityTypeManager()
      ->getStorage('quiz_result')
      ->load($this
      ->get('result_id')
      ->getString());
  }

  /**
   * Indicate whether the response has been evaluated (scored) yet.
   *
   * Questions that require human scoring (e.g. essays) may need to manually
   * toggle this.
   *
   * @return bool
   */
  public function isEvaluated() {
    return (bool) $this
      ->get('is_evaluated')
      ->getString();
  }

  /**
   * Check to see if the answer is marked as correct.
   *
   * This default version returns TRUE if the score is equal to the maximum
   * possible score. Each question type can determine on its own if the question
   * response is "correct". For example a multiple choice question with 4
   * correct answers could be considered correct in different configurations.
   *
   * @return bool
   */
  public function isCorrect() {
    return $this
      ->getMaxScore() == $this
      ->getPoints();
  }

  /**
   * Get the scaled awarded points.
   *
   * This is marked as final to make sure that no question overrides this and
   * causes reporting issues.
   *
   * @return float
   *   The user's scaled awarded points for this question.
   */
  public final function getPoints() {
    return (int) $this
      ->get('points_awarded')
      ->getString();
  }

  /**
   * Get the related question relationship from this quiz result answer.
   *
   * @return QuizQuestionRelationship
   */
  public function getQuestionRelationship() {
    $quiz_result = QuizResult::load($this
      ->get('result_id')
      ->getString());
    $relationships = Drupal::entityTypeManager()
      ->getStorage('quiz_question_relationship')
      ->loadByProperties([
      'quiz_id' => $quiz_result
        ->get('qid')
        ->getString(),
      'quiz_vid' => $quiz_result
        ->get('vid')
        ->getString(),
      'question_id' => $this
        ->get('question_id')
        ->getString(),
      'question_vid' => $this
        ->get('question_vid')
        ->getString(),
    ]);
    if ($relationships) {
      return reset($relationships);
    }
  }

  /**
   * Get the weighted max score of this question response. This is the score
   * that is entered on the manage questions screen. For example if a multiple
   * choice question is worth 4 points, but 8 points are entered on the manage
   * questions screen, 8 points is returned here.
   *
   * @return int
   *   The weighted max score of this question response.
   */
  public function getMaxScore() {
    $quiz = $this
      ->getQuizResult()
      ->getQuiz();
    if ($quiz
      ->get('randomization')
      ->getString() == 2) {
      return (int) $quiz
        ->get('max_score_for_random')
        ->getString();
    }
    if ($quiz
      ->get('randomization')
      ->getString() == 3) {

      /* @var $terms Drupal\paragraphs\Entity\Paragraph[] */
      $terms = $quiz
        ->get('quiz_terms')
        ->referencedEntities();
      $total_questions = [];
      foreach ($terms as $term) {
        if ($term
          ->get('quiz_question_tid')
          ->getString() == $this
          ->get('tid')
          ->getString()) {
          return $term
            ->get('quiz_question_max_score')
            ->getString();
        }
      }
    }
    if ($relationship = $this
      ->getQuestionRelationship()) {
      return (int) $relationship
        ->get('max_score')
        ->getString();
    }
  }

  /**
   * Creates the report form for the admin pages.
   *
   * @return array|null
   *   An renderable FAPI array
   */
  public function getReportForm() {

    // Add general data, and data from the question type implementation.
    $form = array();
    $form['display_number'] = array(
      '#type' => 'value',
      '#value' => $this->display_number,
    );
    $form['score'] = $this
      ->getReportFormScore();
    $form['answer_feedback'] = $this
      ->getReportFormAnswerFeedback();
    return $form;
  }

  /**
   * Get the response part of the report form.
   *
   * @return array
   *   Array of response data, with each item being an answer to a response. For
   *   an example, see MultichoiceResponse::getFeedbackValues(). The sub items
   *   are keyed by the feedback type. Providing a NULL option means that
   *   feedback will not be shown. See an example at
   *   LongAnswerResponse::getFeedbackValues().
   */
  public function getFeedbackValues() {
    $data = array();
    $data[] = array(
      'choice' => 'True',
      'attempt' => 'Did the user choose this?',
      'correct' => 'Was their answer correct?',
      'score' => 'Points earned for this answer',
      'answer_feedback' => 'Feedback specific to the answer',
      'question_feedback' => 'General question feedback for any answer',
      'solution' => 'Is this choice the correct solution?',
      'quiz_feedback' => 'Quiz feedback at this time',
    );
    return $data;
  }

  /**
   * Get the feedback form for the reportForm.
   *
   * @return array|false
   *   An renderable FAPI array, or FALSE if no answer form.
   */
  public function getReportFormAnswerFeedback() {
    $feedback = $this
      ->get('answer_feedback')
      ->getValue()[0];
    return array(
      '#title' => t('Enter feedback'),
      '#type' => 'text_format',
      '#default_value' => $feedback['value'] ?: '',
      '#format' => $feedback['format'] ?: filter_default_format(),
      '#attributes' => array(
        'class' => array(
          'quiz-report-score',
        ),
      ),
    );
  }

  /**
   * Calculate the unscaled score in points for this question response.
   *
   * @param array $values
   *   A part of form state values with the question input from the user.
   *
   * @return int
   *   The unscaled point value of the answer.
   */
  public abstract function score(array $values);

  /**
   * Get the user's response.
   *
   * @return mixed
   *   The answer given by the user
   */
  public abstract function getResponse();

  /**
   * Can the quiz taker view the requested review?
   *
   * @param string $option
   *   An option key.
   *
   * @return bool
   */
  public function canReview($option) {
    $can_review =& drupal_static(__METHOD__, array());
    if (!isset($can_review[$option])) {
      $quiz_result = $this
        ->getQuizResult();
      $can_review[$option] = $quiz_result
        ->canReview($option);
    }
    return $can_review[$option];
  }

  /**
   * Implementation of getReportFormScore().
   *
   * @see QuizQuestionResponse::getReportFormScore()
   */
  public function getReportFormScore() {
    $score = $this
      ->isEvaluated() ? $this
      ->getPoints() : '';
    return array(
      '#title' => 'Enter score',
      '#type' => 'number',
      '#default_value' => $score,
      '#min' => 0,
      '#max' => $this
        ->getMaxScore(),
      '#attributes' => array(
        'class' => array(
          'quiz-report-score',
        ),
      ),
      '#required' => TRUE,
      '#field_suffix' => '/ ' . $this
        ->getMaxScore(),
    );
  }

  /**
   * Get answers for a question in a result.
   *
   * This static method assists in building views for the mass export of
   * question answers.
   *
   * It is not as easy as instantiating all the question responses and returning
   * the answer. To do this in views scalably we have to gather the data
   * carefully.
   *
   * This base method provides a very poor way of gathering the data.
   *
   * @see views_handler_field_prerender_list for the expected return value.
   *
   * @see MultichoiceResponse::viewsGetAnswers() for a correct approach
   * @see TrueFalseResponse::viewsGetAnswers() for a correct approach
   */
  public static function viewsGetAnswers(array $result_answer_ids = array()) {
    $items = array();
    foreach ($result_answer_ids as $result_answer_id) {
      $ra = entity_load_single('quiz_result_answer', $result_answer_id);
      $question = node_load($ra->question_nid, $ra->question_vid);

      /* @var $ra_i QuizQuestionResponse */
      $ra_i = _quiz_question_response_get_instance($ra->result_id, $question);
      $items[$ra->result_id][] = array(
        'answer' => $ra_i
          ->getResponse(),
      );
    }
    return $items;
  }

  /**
   * Get the weighted score ratio.
   *
   * This returns the ratio of the weighted score of this question versus the
   * question score. For example, if the question is worth 10 points in the
   * associated quiz, but it is a 3 point multichoice question, the weighted
   * ratio is 3.33.
   *
   * This is marked as final to make sure that no question overrides this and
   * causes reporting issues.
   *
   * @return float
   *   The weight of the question
   */
  public function getWeightedRatio() {
    if ($this
      ->getMaxScore() == 0) {
      return 0;
    }

    // getMaxScore() will get the relationship max score.
    // getMaximumScore() gets the unscaled question max score.
    return $this
      ->getMaxScore() / $this
      ->getQuizQuestion()
      ->getMaximumScore();
  }

  /**
   * Indicate whether the response has been evaluated (scored) yet.
   *
   * Questions that require human scoring (e.g. essays) may need to manually
   * toggle this.
   *
   * @return bool
   */
  public function isAnswered() {
    return (bool) (!$this
      ->get('answer_timestamp')
      ->isEmpty());
  }

  /**
   * Indicate if the question was marked as skipped.
   *
   * @return bool
   */
  public function isSkipped() {
    return (bool) $this
      ->get('is_skipped')
      ->getString();
  }

}