class.ilAssQuestionPreviewSession.php

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<?php
class ilAssQuestionPreviewSession
{
    public const SESSION_BASEINDEX = 'ilAssQuestionPreviewSessions';

    public const SESSION_SUBINDEX_INSTANT_RESPONSE_ACTIVE = 'instantResponseActive';
    public const SESSION_SUBINDEX_PARTICIPANT_SOLUTION = 'participantSolution';
    public const SESSION_SUBINDEX_REQUESTED_HINTS = 'requestedHints';
    public const SESSION_SUBINDEX_RANDOMIZER_SEED = 'randomizerSeed';

    private $userId;
    private $questionId;

    public function __construct($userId, $questionId)
    {
        $this->userId = $userId;
        $this->questionId = $questionId;
    }

    public function init(): void
    {
        $this->ensureSessionStructureExists();
    }

    public function getUserId()
    {
        return $this->userId;
    }

    public function getQuestionId()
    {
        return $this->questionId;
    }

    private function getSessionContextIndex(): string
    {
        return "u{$this->userId}::q{$this->questionId}";
    }

    private function saveSessionValue($subIndex, $value): void
    {
        $val = ilSession::get(self::SESSION_BASEINDEX);
        $val[$this->getSessionContextIndex()][$subIndex] = $value;
        ilSession::set(self::SESSION_BASEINDEX, $val);
    }

    private function issetSessionValue($subIndex): bool
    {
        $val = ilSession::get(self::SESSION_BASEINDEX);
        return isset($val[$this->getSessionContextIndex()][$subIndex]);
    }

    private function readSessionValue($subIndex)
    {
        $val = ilSession::get(self::SESSION_BASEINDEX);
        return $val[$this->getSessionContextIndex()][$subIndex] ?? [];
    }

    public function setInstantResponseActive($instantResponseActive): void
    {
        $this->saveSessionValue(self::SESSION_SUBINDEX_INSTANT_RESPONSE_ACTIVE, $instantResponseActive);
    }

    public function isInstantResponseActive()
    {
        return $this->readSessionValue(self::SESSION_SUBINDEX_INSTANT_RESPONSE_ACTIVE);
    }

    public function setParticipantsSolution($participantSolution): void
    {
        $this->saveSessionValue(self::SESSION_SUBINDEX_PARTICIPANT_SOLUTION, $participantSolution);
    }

    public function getParticipantsSolution()
    {
        return $this->readSessionValue(self::SESSION_SUBINDEX_PARTICIPANT_SOLUTION) == [] ? null : $this->readSessionValue(self::SESSION_SUBINDEX_PARTICIPANT_SOLUTION);
    }

    public function hasParticipantSolution(): bool
    {
        return $this->issetSessionValue(self::SESSION_SUBINDEX_PARTICIPANT_SOLUTION);
    }

    public function getNumRequestedHints(): int
    {
        if (!$this->issetSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS)) {
            return 0;
        }
        $hints = $this->readSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS);

        if (!is_array($hints)) {
            return 0;
        }

        return count($hints);
    }

    public function isHintRequested($hintId): bool
    {
        if ($this->issetSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS)) {
            $requestedHints = $this->readSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS);
            return isset($requestedHints[$hintId]);
        }

        return false;
    }

    public function addRequestedHint($hintId): void
    {
        $requestedHints = $this->getRequestedHints();
        $requestedHints[$hintId] = $hintId;
        $this->saveSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS, $requestedHints);
    }

    public function getRequestedHints()
    {
        if ($this->issetSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS)) {
            return $this->readSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS);
        }

        return [];
    }

    public function resetRequestedHints(): void
    {
        $this->saveSessionValue(self::SESSION_SUBINDEX_REQUESTED_HINTS, array());
    }

    public function setRandomizerSeed($seed): void
    {
        $this->saveSessionValue(self::SESSION_SUBINDEX_RANDOMIZER_SEED, $seed);
    }

    public function getRandomizerSeed(): ?int
    {
        $val = $this->readSessionValue(self::SESSION_SUBINDEX_RANDOMIZER_SEED);
        return $val === [] ? null : $val;
    }

    public function randomizerSeedExists(): bool
    {
        return ($this->getRandomizerSeed() !== null);
    }

    private function ensureSessionStructureExists(): void
    {
        if (!is_array(ilSession::get(self::SESSION_BASEINDEX))) {
            ilSession::set(self::SESSION_BASEINDEX, array());
        }

        $baseSession = ilSession::get(self::SESSION_BASEINDEX);

        if (!isset($baseSession[$this->getSessionContextIndex()])) {
            $baseSession[$this->getSessionContextIndex()] = array();
        }

        $contextSession = &$baseSession[$this->getSessionContextIndex()];

        if (!isset($contextSession[self::SESSION_SUBINDEX_INSTANT_RESPONSE_ACTIVE])) {
            $contextSession[self::SESSION_SUBINDEX_INSTANT_RESPONSE_ACTIVE] = 0;
        }

        if (!isset($contextSession[self::SESSION_SUBINDEX_PARTICIPANT_SOLUTION])) {
            $contextSession[self::SESSION_SUBINDEX_PARTICIPANT_SOLUTION] = null;
        }

        if (!isset($contextSession[self::SESSION_SUBINDEX_RANDOMIZER_SEED])) {
            $contextSession[self::SESSION_SUBINDEX_RANDOMIZER_SEED] = null;
        }

        ilSession::set(self::SESSION_BASEINDEX, $baseSession);
    }
}