class.ilAssQuestionPreviewHintTracking.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */


class ilAssQuestionPreviewHintTracking
{
    private $db;

    private $previewSession;
    
    public function __construct(ilDBInterface $db, ilAssQuestionPreviewSession $previewSession)
    {
        $this->db = $db;
        $this->previewSession = $previewSession;
    }
    
    public function requestsExist()
    {
        return (
            $this->previewSession->getNumRequestedHints() > 0
        );
    }
    
    public function requestsPossible()
    {
        $query = "
                        SELECT          COUNT(qht_hint_id) cnt_available
                        FROM            qpl_hints
                        WHERE           qht_question_fi = %s
                ";

        $res = $this->db->queryF(
            $query,
            array('integer'),
            array($this->previewSession->getQuestionId())
        );

        $row = $this->db->fetchAssoc($res);

        if ($row['cnt_available'] > $this->previewSession->getNumRequestedHints()) {
            return true;
        }

        return false;
    }
    
    public function getNextRequestableHint()
    {
        $query = "
                        SELECT          qht_hint_id
                        
                        FROM            qpl_hints
                        
                        WHERE           qht_question_fi = %s
                        
                        ORDER BY        qht_hint_index ASC
                ";

        $res = $this->db->queryF(
            $query,
            array('integer'),
            array($this->previewSession->getQuestionId())
        );

        while ($row = $this->db->fetchAssoc($res)) {
            if (!$this->isRequested($row['qht_hint_id'])) {
                return ilAssQuestionHint::getInstanceById($row['qht_hint_id']);
            }
        }

        throw new ilTestException(
            "no next hint found for questionId={$this->previewSession->getQuestionId()}, userId={$this->previewSession->getUserId()}"
        );
    }

    public function storeRequest(ilAssQuestionHint $questionHint)
    {
        $this->previewSession->addRequestedHint($questionHint->getId());
    }
    
    public function isRequested($hintId)
    {
        return $this->previewSession->isHintRequested($hintId);
    }

    public function getNumExistingRequests()
    {
        return $this->previewSession->getNumRequestedHints();
    }

    public function getRequestedHintsList()
    {
        $hintIds = $this->previewSession->getRequestedHints();

        $requestedHintsList = ilAssQuestionHintList::getListByHintIds($hintIds);

        return $requestedHintsList;
    }
    
    public function getRequestStatisticData()
    {
        $count = 0;
        $points = 0;
        
        foreach ($this->getRequestedHintsList() as $hint) {
            $count++;
            $points += $hint->getPoints();
        }
        
        $requestsStatisticData = new ilAssQuestionHintRequestStatisticData();
        $requestsStatisticData->setRequestsCount($count);
        $requestsStatisticData->setRequestsPoints($points);
        
        return $requestsStatisticData;
    }
}