trait QuizResultAnswerEntityTrait in Quiz 6.x

trait QuizResultAnswerEntityTrait {

  /**
   * {@inheritdoc}
   */
  public function getQuizQuestion() : QuizQuestion {
    return Drupal::entityTypeManager()
      ->getStorage('quiz_question')
      ->loadRevision($this
      ->get('question_vid')
      ->getString());
  }

  /**
   * {@inheritdoc}
   */
  public function getQuizResult() : QuizResult {
    return Drupal::entityTypeManager()
      ->getStorage('quiz_result')
      ->load($this
      ->get('result_id')
      ->getString());
  }

  /**
   * {@inheritdoc}
   */
  public function isEvaluated() : bool {
    return (bool) $this
      ->get('is_evaluated')
      ->getString();
  }

  /**
   * {@inheritdoc}
   */
  public function isCorrect() : bool {
    return $this
      ->getMaxScore() == $this
      ->getPoints();
  }

  /**
   * {@inheritdoc}
   *
   * This is marked as final to make sure that no question overrides this and
   * causes reporting issues.
   */
  public final function getPoints() : int {
    return (int) $this
      ->get('points_awarded')
      ->getString();
  }

  /**
   * {@inheritdoc}
   */
  public function getQuestionRelationship() : ?QuizQuestionRelationship {
    $quiz_result = QuizResult::load($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);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getMaxScore() : int {
    $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();
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getReportForm() : array {

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

  /**
   * {@inheritdoc}
   */
  public function getFeedbackValues() : array {
    $data = [];
    $data[] = [
      '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 [
      '#title' => t('Enter feedback'),
      '#type' => 'text_format',
      '#default_value' => $feedback['value'] ?: '',
      '#format' => $feedback['format'] ?: filter_default_format(),
      '#attributes' => [
        'class' => [
          'quiz-report-score',
        ],
      ],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function canReview(string $option) : bool {
    $can_review =& drupal_static(__METHOD__, []);
    if (!isset($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 [
      '#title' => 'Enter score',
      '#type' => 'number',
      '#default_value' => $score,
      '#min' => 0,
      '#max' => $this
        ->getMaxScore(),
      '#attributes' => [
        'class' => [
          'quiz-report-score',
        ],
      ],
      '#required' => TRUE,
      '#field_suffix' => '/ ' . $this
        ->getMaxScore(),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public static function viewsGetAnswers(array $result_answer_ids = []) : array {
    $items = [];
    $qras = QuizResultAnswer::loadMultiple($result_answer_ids);
    foreach ($qras as $qra) {
      $items[$qra
        ->getQuizResult()
        ->id()][] = [
        'answer' => $qra
          ->getResponse(),
      ];
    }
    return $items;
  }

  /**
   * {@inheritdoc}
   */
  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();
  }

  /**
   * {@inheritdoc}
   */
  public function isAnswered() : bool {
    return (bool) (!$this
      ->get('answer_timestamp')
      ->isEmpty());
  }

  /**
   * {@inheritdoc}
   */
  public function isSkipped() : bool {
    return (bool) $this
      ->get('is_skipped')
      ->getString();
  }

  /**
   * {@inheritdoc}
   */
  public final function setEvaluated($evaluated = TRUE) {
    return $this
      ->set('is_evaluated', $evaluated);
  }

}