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 */
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 */
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class random_question_loader {
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class random_question_loader {
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    /** @var \qubaid_condition which usages to consider previous attempts from. */
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    /** @var \qubaid_condition which usages to consider previous attempts from. */
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    protected $qubaids;
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    protected $qubaids;
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    /**
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     * @var array Array of question types to include in random questions.
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    /** @var array qtypes that cannot be used by random questions. */
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     */
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    protected $excludedqtypes;
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    protected $includedqtypes = [];
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    /** @var array categoryid & include subcategories => num previous uses => questionid => 1. */
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    /** @var array categoryid & include subcategories => num previous uses => questionid => 1. */
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     */
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     */
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    public function __construct(\qubaid_condition $qubaids, array $usedquestions = []) {
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    public function __construct(\qubaid_condition $qubaids, array $usedquestions = []) {
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        $this->qubaids = $qubaids;
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        $this->qubaids = $qubaids;
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        $this->recentlyusedquestions = $usedquestions;
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        $this->recentlyusedquestions = $usedquestions;
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        // Load the possible question types we can select from.
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        foreach (\question_bank::get_all_qtypes() as $qtype) {
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        foreach (\question_bank::get_all_qtypes() as $qtype) {
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            if (!$qtype->is_usable_by_random()) {
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            if ($qtype->is_usable_by_random()) {
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                $this->excludedqtypes[] = $qtype->name();
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                $this->includedqtypes[] = $qtype->name();
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            }
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            }
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        }
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        }
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    }
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    }
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            }
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            }
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        }
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        }
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        $filtercondition = $filterconditions ? 'AND ' . implode(' AND ', $filterconditions) : '';
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        $filtercondition = $filterconditions ? 'AND ' . implode(' AND ', $filterconditions) : '';
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        // Prepare qtype check.
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        // Prepare qtype check.
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        [$qtypecondition, $qtypeparams] = $DB->get_in_or_equal($this->excludedqtypes,
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        [$qtypecondition, $qtypeparams] = $DB->get_in_or_equal($this->includedqtypes,
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            SQL_PARAMS_NAMED, 'excludedqtype', false);
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            SQL_PARAMS_NAMED, 'includedqtype');
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        if ($qtypecondition) {
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        if ($qtypecondition) {
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            $qtypecondition = 'AND q.qtype ' . $qtypecondition;
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            $qtypecondition = 'AND q.qtype ' . $qtypecondition;
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        }
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        }