<?
/* Copyright (c) Rik Snel 2011, license GNU AGPLv3 */

define('LEERLING', 1);
define('DOCENT', 2);
define('LOKAAL', 3);
define('LESGROEP', 4);
define('STAMKLAS', 5);
define('VAK', 6);
define('CATEGORIE',7);

function get_default_week($weken, $schooljaar) {
	if (count($weken) == 0) return NULL;
	if (count($weken) == 1) return $weken[0];

	// de default week is de eerste lesweek na vrijdag het 9e uur in de vorige lesweek
	$week = date('W', $_SERVER['REQUEST_TIME'] + 2*24*60*60 + (10 + 7*60)*60);
	$year = date('o', $_SERVER['REQUEST_TIME'] + 2*24*60*60 + (10 + 7*60)*60);

	$weken_values = array_values($weken);
	$startweek = $weken_values[0];
	$eindweek = end($weken);

	if ($week >= $startweek && $startweek > 30) {
		if ($year < substr($schooljaar, 0, 4)) {
			$week = $startweek;
		} else if ($year > substr($schooljaar, 0, 4)) {
			$week = $eindweek;
		}
	} else if ($week <= $eindweek && $eindweek < 31) {
		if ($year < substr($schooljaar, 5)) {
			$week = $startweek;
		} else if ($year > substr($schooljaar, 5)) {
			$week = $eindweek;
		}
	} else if ($year <= substr($schooljaar, 0, 4)) {
		$week = $startweek;
	} else {
		$week = $eindweek;
        }

        while (!in_array($week, $weken) && $week < 53) $week++;
        if (!in_array($week, $weken)) $week = 1;
        while (!in_array($week, $weken) && $week < 31) $week++;

	if ($week == 31) $week = $weken[count($weken) - 1];

        return $week;
}

?>