class.ilTestSequence.php

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<?php

declare(strict_types=1);

use ILIAS\TestQuestionPool\QuestionInfoService;

class ilTestSequence implements ilTestQuestionSequence, ilTestSequenceSummaryProvider
{
    public array $sequencedata;

    public array $questions;
    protected array $alreadyPresentedQuestions = [];
    protected int $newlyPresentedQuestion = 0;

    protected array $alreadyCheckedQuestions = [];
    protected ?int $newlyCheckedQuestion = null;
    /*
     * @var array<int>
     */
    protected array $optionalQuestions = [];
    private bool $answeringOptionalQuestionsConfirmed = false;
    private bool $considerHiddenQuestionsEnabled = false;
    private bool $considerOptionalQuestionsEnabled = true;

    public function __construct(
        protected ilDBInterface $db,
        protected int $active_id,
        protected int $pass,
        protected QuestionInfoService $questioninfo
    ) {
        $this->sequencedata = [
            "sequence" => [],
            "postponed" => [],
            "hidden" => []
        ];
    }

    public function getActiveId(): int
    {
        return $this->active_id;
    }

    public function createNewSequence(int $max, bool $shuffle): void
    {
        $newsequence = [];
        if ($max > 0) {
            for ($i = 1; $i <= $max; $i++) {
                $newsequence[] = $i;
            }
            if ($shuffle) {
                $newsequence = $this->pcArrayShuffle($newsequence);
            }
        }
        $this->sequencedata["sequence"] = $newsequence;
    }

    public function loadQuestions(): void
    {
        $this->questions = [];

        $result = $this->db->queryF(
            "SELECT tst_test_question.* FROM tst_test_question, qpl_questions, tst_active WHERE tst_active.active_id = %s AND tst_test_question.test_fi = tst_active.test_fi AND qpl_questions.question_id = tst_test_question.question_fi ORDER BY tst_test_question.sequence",
            array('integer'),
            array($this->active_id)
        );

        $index = 1;

        // TODO bheyser: There might be "sequence" gaps which lead to issues with tst_sequence when deleting/adding questions before any participant starts the test
        while ($data = $this->db->fetchAssoc($result)) {
            $this->questions[$index++] = $data["question_fi"];
        }
    }

    public function loadFromDb(): void
    {
        $this->loadQuestionSequence();
        $this->loadPresentedQuestions();
        $this->loadCheckedQuestions();
        $this->loadOptionalQuestions();
    }

    private function loadQuestionSequence(): void
    {
        $result = $this->db->queryF(
            "SELECT * FROM tst_sequence WHERE active_fi = %s AND pass = %s",
            array('integer','integer'),
            array($this->active_id, $this->pass)
        );
        if ($result->numRows()) {
            $row = $this->db->fetchAssoc($result);
            $this->sequencedata = [
                "sequence" => unserialize($row["sequence"] ?? '', ['allowed_classes' => false]),
                "postponed" => unserialize($row["postponed"] ?? '', ['allowed_classes' => false]),
                "hidden" => unserialize($row["hidden"] ?? '', ['allowed_classes' => false])
            ];

            if (!is_array($this->sequencedata["sequence"])) {
                $this->sequencedata["sequence"] = [];
            }
            if (!is_array($this->sequencedata["postponed"])) {
                $this->sequencedata["postponed"] = [];
            }
            if (!is_array($this->sequencedata["hidden"])) {
                $this->sequencedata["hidden"] = [];
            }

            $this->setAnsweringOptionalQuestionsConfirmed((bool) $row['ans_opt_confirmed']);
        }
    }

    protected function loadPresentedQuestions(): void
    {
        $res = $this->db->queryF(
            "SELECT question_fi FROM tst_seq_qst_presented WHERE active_fi = %s AND pass = %s",
            array('integer','integer'),
            array($this->active_id, $this->pass)
        );

        while ($row = $this->db->fetchAssoc($res)) {
            $this->alreadyPresentedQuestions[ $row['question_fi'] ] = $row['question_fi'];
        }
    }

    private function loadCheckedQuestions(): void
    {
        $res = $this->db->queryF(
            "SELECT question_fi FROM tst_seq_qst_checked WHERE active_fi = %s AND pass = %s",
            array('integer','integer'),
            array($this->active_id, $this->pass)
        );

        while ($row = $this->db->fetchAssoc($res)) {
            $this->alreadyCheckedQuestions[ $row['question_fi'] ] = $row['question_fi'];
        }
    }

    private function loadOptionalQuestions(): void
    {
        $res = $this->db->queryF(
            "SELECT question_fi FROM tst_seq_qst_optional WHERE active_fi = %s AND pass = %s",
            array('integer','integer'),
            array($this->active_id, $this->pass)
        );

        while ($row = $this->db->fetchAssoc($res)) {
            $this->optionalQuestions[ $row['question_fi'] ] = $row['question_fi'];
        }
    }

    public function saveToDb(): void
    {
        $this->saveQuestionSequence();
        $this->saveNewlyPresentedQuestion();
        $this->saveNewlyCheckedQuestion();
        $this->saveOptionalQuestions();
    }

    private function saveQuestionSequence(): void
    {
        $postponed = null;
        if ((is_array($this->sequencedata["postponed"])) && (count($this->sequencedata["postponed"]))) {
            $postponed = serialize($this->sequencedata["postponed"]);
        }
        $hidden = null;
        if ((is_array($this->sequencedata["hidden"])) && (count($this->sequencedata["hidden"]))) {
            $hidden = serialize($this->sequencedata["hidden"]);
        }

        $this->db->manipulateF(
            "DELETE FROM tst_sequence WHERE active_fi = %s AND pass = %s",
            array('integer','integer'),
            array($this->active_id, $this->pass)
        );

        $this->db->insert("tst_sequence", array(
            "active_fi" => array("integer", $this->active_id),
            "pass" => array("integer", $this->pass),
            "sequence" => array("clob", serialize($this->sequencedata["sequence"])),
            "postponed" => array("text", $postponed),
            "hidden" => array("text", $hidden),
            "tstamp" => array("integer", time()),
            'ans_opt_confirmed' => array('integer', (int) $this->isAnsweringOptionalQuestionsConfirmed())
        ));
    }

    protected function saveNewlyPresentedQuestion(): void
    {
        if ($this->newlyPresentedQuestion) {
            $this->db->replace('tst_seq_qst_presented', array(
                'active_fi' => array('integer', $this->active_id),
                'pass' => array('integer', $this->pass),
                'question_fi' => array('integer', $this->newlyPresentedQuestion)
            ), []);
        }
    }

    private function saveNewlyCheckedQuestion(): void
    {
        if ((int) $this->newlyCheckedQuestion) {
            $this->db->replace('tst_seq_qst_checked', array(
                'active_fi' => array('integer', $this->active_id),
                'pass' => array('integer', $this->pass),
                'question_fi' => array('integer', (int) $this->newlyCheckedQuestion)
            ), []);
        }
    }

    private function saveOptionalQuestions(): void
    {
        $NOT_IN_questions = $this->db->in('question_fi', $this->optionalQuestions, true, 'integer');

        $this->db->queryF(
            "DELETE FROM tst_seq_qst_optional WHERE active_fi = %s AND pass = %s AND $NOT_IN_questions",
            array('integer', 'integer'),
            array($this->active_id, $this->pass)
        );

        foreach ($this->optionalQuestions as $questionId) {
            $this->db->replace('tst_seq_qst_optional', array(
                'active_fi' => array('integer', $this->active_id),
                'pass' => array('integer', $this->pass),
                'question_fi' => array('integer', (int) $questionId)
            ), []);
        }
    }

    public function postponeQuestion(int $question_id): void
    {
        if (!$this->isPostponedQuestion($question_id)) {
            $this->sequencedata["postponed"][] = $question_id;
        }
    }

    public function hideQuestion(int $question_id): void
    {
        if (!$this->isHiddenQuestion($question_id)) {
            $this->sequencedata["hidden"][] = $question_id;
        }
    }

    public function isPostponedQuestion(int $question_id): bool
    {
        if (!is_array($this->sequencedata["postponed"])) {
            return false;
        }
        if (!in_array($question_id, $this->sequencedata["postponed"])) {
            return false;
        }

        return true;
    }

    public function isHiddenQuestion(int $question_id): bool
    {
        if (!is_array($this->sequencedata["hidden"])) {
            return false;
        }
        if (!in_array($question_id, $this->sequencedata["hidden"])) {
            return false;
        }

        return true;
    }

    public function isPostponedSequence(int $sequence): bool
    {
        if (!array_key_exists($sequence, $this->questions)) {
            return false;
        }
        if (!is_array($this->sequencedata["postponed"])) {
            return false;
        }
        if (!in_array($this->questions[$sequence], $this->sequencedata["postponed"])) {
            return false;
        }

        return true;
    }

    public function isHiddenSequence(int $sequence): bool
    {
        if (!array_key_exists($sequence, $this->questions)) {
            return false;
        }
        if (!is_array($this->sequencedata["hidden"])) {
            return false;
        }
        if (!in_array($this->questions[$sequence], $this->sequencedata["hidden"])) {
            return false;
        }
        return true;
    }

    public function postponeSequence(int $sequence): void
    {
        if (!$this->isPostponedSequence($sequence)) {
            if (array_key_exists($sequence, $this->questions)) {
                if (!is_array($this->sequencedata["postponed"])) {
                    $this->sequencedata["postponed"] = [];
                }
                $this->sequencedata["postponed"][] = (int) $this->questions[$sequence];
            }
        }
    }

    public function hideSequence(int $sequence): void
    {
        if (!$this->isHiddenSequence($sequence)) {
            if (array_key_exists($sequence, $this->questions)) {
                if (!is_array($this->sequencedata["hidden"])) {
                    $this->sequencedata["hidden"] = [];
                }
                $this->sequencedata["hidden"][] = (int) $this->questions[$sequence];
            }
        }
    }

    public function setQuestionPresented(int $question_id): void
    {
        $this->newlyPresentedQuestion = $question_id;
    }

    public function isQuestionPresented(int $question_id): bool
    {
        return (
            $this->newlyPresentedQuestion == $question_id || in_array($question_id, $this->alreadyPresentedQuestions)
        );
    }

    public function isNextQuestionPresented(int $question_id): bool
    {
        $next_question_id = $this->getQuestionForSequence(
            $this->getNextSequence($this->getSequenceForQuestion($question_id)) ?? 0
        );

        if ($next_question_id === null) {
            return false;
        }

        if ($this->newlyPresentedQuestion === $next_question_id) {
            return true;
        }

        if (in_array($next_question_id, $this->alreadyPresentedQuestions)) {
            return true;
        }

        return false;
    }

    public function setQuestionChecked(int $question_id): void
    {
        $this->newlyCheckedQuestion = $question_id;
    }

    public function isQuestionChecked(int $question_id): bool
    {
        return isset($this->alreadyCheckedQuestions[$question_id]);
    }

    public function getPositionOfSequence(int $sequence): int
    {
        $corrected_sequence = $this->getCorrectedSequence();
        $sequence_key = array_search($sequence, $corrected_sequence);
        if ($sequence_key !== false) {
            return $sequence_key + 1;
        }
        return 0;
    }

    public function getUserQuestionCount(): int
    {
        return count($this->getCorrectedSequence());
    }

    public function getOrderedSequence(): array
    {
        $sequenceKeys = [];

        foreach (array_keys($this->questions) as $sequenceKey) {
            if ($this->isHiddenSequence($sequenceKey) && !$this->isConsiderHiddenQuestionsEnabled()) {
                continue;
            }

            $sequenceKeys[] = $sequenceKey;
        }

        return $sequenceKeys;
    }

    public function getOrderedSequenceQuestions(): array
    {
        $questions = [];

        foreach ($this->questions as $questionId) {
            if ($this->isHiddenQuestion($questionId) && !$this->isConsiderHiddenQuestionsEnabled()) {
                continue;
            }

            if ($this->isQuestionOptional($questionId) && !$this->isConsiderOptionalQuestionsEnabled()) {
                continue;
            }

            $questions[] = $questionId;
        }

        return $questions;
    }

    public function getUserSequence(): array
    {
        return $this->getCorrectedSequence();
    }

    public function getUserSequenceQuestions(): array
    {
        $seq = $this->getCorrectedSequence();
        $found = [];
        foreach ($seq as $sequence) {
            $found[] = $this->getQuestionForSequence($sequence);
        }
        return $found;
    }

    private function ensureQuestionNotInSequence(array $sequence, int $question_id): array
    {
        $question_key = array_search($question_id, $this->questions);

        if ($question_key === false) {
            return $sequence;
        }

        $sequence_key = array_search($question_key, $sequence);

        if ($sequence_key === false) {
            return $sequence;
        }

        unset($sequence[$sequence_key]);

        return $sequence;
    }

    protected function getCorrectedSequence(): array
    {
        $corrected_sequence = $this->sequencedata["sequence"];
        if (!$this->isConsiderHiddenQuestionsEnabled()
            && is_array($this->sequencedata["hidden"])) {
            foreach ($this->sequencedata["hidden"] as $question_id) {
                $corrected_sequence = $this->ensureQuestionNotInSequence($corrected_sequence, $question_id);
            }
        }
        if (!$this->isConsiderOptionalQuestionsEnabled()) {
            foreach ($this->optionalQuestions as $question_id) {
                $corrected_sequence = $this->ensureQuestionNotInSequence($corrected_sequence, $question_id);
            }
        }
        if (is_array($this->sequencedata["postponed"])) {
            foreach ($this->sequencedata["postponed"] as $question_id) {
                $found_sequence = array_search($question_id, $this->questions);
                if ($found_sequence === false) {
                    continue;
                }
                $sequence_key = array_search($found_sequence, $corrected_sequence);
                if ($sequence_key !== false) {
                    unset($corrected_sequence[$sequence_key]);
                    $corrected_sequence[] = $found_sequence;
                }
            }
        }
        return array_values($corrected_sequence);
    }

    public function getSequenceForQuestion(int $question_id): ?int
    {
        return array_search($question_id, $this->questions) ?: null;
    }

    public function getFirstSequence(): int
    {
        $correctedsequence = $this->getCorrectedSequence();
        if (count($correctedsequence)) {
            return reset($correctedsequence);
        }

        return 0;
    }

    public function getLastSequence(): int
    {
        $correctedsequence = $this->getCorrectedSequence();
        if (count($correctedsequence)) {
            return end($correctedsequence);
        }

        return 0;
    }

    public function getNextSequence(int $sequence): int
    {
        $corrected_sequence = $this->getCorrectedSequence();
        $sequence_key = array_search($sequence, $corrected_sequence);
        if ($sequence_key !== false) {
            $next_sequence_key = $sequence_key + 1;
            if (array_key_exists($next_sequence_key, $corrected_sequence)) {
                return $corrected_sequence[$next_sequence_key];
            }
        }
        return 0;
    }

    public function getPreviousSequence(int $sequence): int
    {
        $correctedsequence = $this->getCorrectedSequence();
        $sequencekey = array_search($sequence, $correctedsequence);
        if ($sequencekey !== false) {
            $prevsequencekey = $sequencekey - 1;
            if (($prevsequencekey >= 0) && (array_key_exists($prevsequencekey, $correctedsequence))) {
                return $correctedsequence[$prevsequencekey];
            }
        }

        return 0;
    }

    public function pcArrayShuffle(array $array): array
    {
        $keys = array_keys($array);
        shuffle($keys);
        $result = [];
        foreach ($keys as $key) {
            $result[$key] = $array[$key];
        }
        return $result;
    }

    public function getQuestionForSequence(int $sequence): ?int
    {
        if ($sequence < 1) {
            return null;
        }
        if (array_key_exists($sequence, $this->questions)) {
            return $this->questions[$sequence];
        }

        return null;
    }

    public function getSequenceSummary(bool $obligationsFilterEnabled = false): array
    {
        $correctedsequence = $this->getCorrectedSequence();
        $result_array = [];
        $solved_questions = ilObjTest::_getSolvedQuestions($this->active_id);
        $key = 1;
        foreach ($correctedsequence as $sequence) {
            $question = assQuestion::instantiateQuestion($this->getQuestionForSequence($sequence));
            if (is_object($question)) {
                $worked_through = $this->questioninfo->lookupResultRecordExist($this->active_id, $question->getId(), $this->pass);
                $solved = 0;
                if (array_key_exists($question->getId(), $solved_questions)) {
                    $solved = $solved_questions[$question->getId()]["solved"];
                }
                $is_postponed = $this->isPostponedQuestion($question->getId());

                $row = [
                    "nr" => "$key",
                    "title" => $question->getTitleForHTMLOutput(),
                    "qid" => $question->getId(),
                    "presented" => $this->isQuestionPresented($question->getId()),
                    "visited" => $worked_through,
                    "solved" => (($solved) ? "1" : "0"),
                    "description" => $question->getComment(),
                    "points" => $question->getMaximumPoints(),
                    "worked_through" => $worked_through,
                    "postponed" => $is_postponed,
                    "sequence" => $sequence,
                    "obligatory" => ilObjTest::isQuestionObligatory($question->getId()),
                    'isAnswered' => $question->isAnswered($this->active_id, $this->pass),
                    'has_authorized_answer' => $question->authorizedSolutionExists($this->active_id, $this->pass)

                ];

                if (!$obligationsFilterEnabled || $row['obligatory']) {
                    $result_array[] = $row;
                }

                $key++;
            }
        }
        return $result_array;
    }

    public function getPass(): int
    {
        return $this->pass;
    }

    public function setPass(int $pass): void
    {
        $this->pass = $pass;
    }

    public function hasSequence(): bool
    {
        if ((is_array($this->sequencedata["sequence"])) && (count($this->sequencedata["sequence"]) > 0)) {
            return true;
        }

        return false;
    }

    public function hasHiddenQuestions(): bool
    {
        if ((is_array($this->sequencedata["hidden"])) && (count($this->sequencedata["hidden"]) > 0)) {
            return true;
        }

        return false;
    }

    public function clearHiddenQuestions(): void
    {
        $this->sequencedata["hidden"] = [];
    }

    public function hasStarted(ilTestSession $testSession): bool
    {
        if ($testSession->getLastSequence() < 1) {
            return false;
        }

        // WTF ?? heard about tests with only one question !?
        if ($testSession->getLastSequence() == $this->getFirstSequence()) {
            return false;
        }

        return true;
    }

    public function openQuestionExists(): bool
    {
        return $this->getFirstSequence() !== 0;
    }

    public function getQuestionIds(): array
    {
        return array_values($this->questions);
    }

    public function questionExists(int $question_id): bool
    {
        return in_array($question_id, $this->questions);
    }

    //-----------------------------------------------------------------------//
    public function setQuestionOptional(int $question_id): void
    {
        $this->optionalQuestions[$question_id] = $question_id;
    }

    public function isQuestionOptional(int $question_id): bool
    {
        return isset($this->optionalQuestions[$question_id]);
    }

    public function hasOptionalQuestions(): bool
    {
        return (bool) count($this->optionalQuestions);
    }

    public function getOptionalQuestions(): array
    {
        return $this->optionalQuestions;
    }

    public function clearOptionalQuestions(): void
    {
        $this->optionalQuestions = [];
    }

    public function reorderOptionalQuestionsToSequenceEnd(): void
    {
        $optionalSequenceKeys = [];

        foreach ($this->sequencedata['sequence'] as $index => $sequenceKey) {
            if ($this->isQuestionOptional($this->getQuestionForSequence($sequenceKey))) {
                $optionalSequenceKeys[$index] = $sequenceKey;
                unset($this->sequencedata['sequence'][$index]);
            }
        }

        foreach ($optionalSequenceKeys as $index => $sequenceKey) {
            $this->sequencedata['sequence'][$index] = $sequenceKey;
        }
    }

    public function isAnsweringOptionalQuestionsConfirmed(): bool
    {
        return $this->answeringOptionalQuestionsConfirmed;
    }

    public function setAnsweringOptionalQuestionsConfirmed(bool $answeringOptionalQuestionsConfirmed): void
    {
        $this->answeringOptionalQuestionsConfirmed = $answeringOptionalQuestionsConfirmed;
    }

    //-----------------------------------------------------------------------//

    public function isConsiderHiddenQuestionsEnabled(): bool
    {
        return $this->considerHiddenQuestionsEnabled;
    }

    public function setConsiderHiddenQuestionsEnabled(bool $considerHiddenQuestionsEnabled): void
    {
        $this->considerHiddenQuestionsEnabled = $considerHiddenQuestionsEnabled;
    }

    public function isConsiderOptionalQuestionsEnabled(): bool
    {
        return $this->considerOptionalQuestionsEnabled;
    }

    public function setConsiderOptionalQuestionsEnabled(bool $considerOptionalQuestionsEnabled): void
    {
        $this->considerOptionalQuestionsEnabled = $considerOptionalQuestionsEnabled;
    }
}