<?php

class Exams
{

	/**
	 * @param int[] of location ids. must bot be an associative array.
	 * @return: bool true iff for any of the given location ids an exam is scheduled.
	 **/
	public static function isInExamMode($locationIds, &$lectureId = false, &$autoLogin = false)
	{
		if (!is_array($locationIds)) {
			$locationIds = array($locationIds);
		}
		if (empty($locationIds)) {
			$locationIds[] = 0;
		}
		$res = Database::queryFirst("SELECT lectureid, autologin FROM exams"
			. " INNER JOIN exams_x_location USING (examid)"
			. " WHERE UNIX_TIMESTAMP() BETWEEN starttime AND endtime AND (locationid IN (:lids) OR locationid IS NULL) LIMIT 1", [
				'lids' => array_values($locationIds),
		]);
		if ($res !== false) {
			$lectureId = $res['lectureid'];
			$autoLogin = $res['autologin'];
		}
		return $res !== false;
	}

}