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<?php
/**
* ForumVisit - Functions for visit-dates for threads
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* @author Till Glöggler <tgloeggl@uos.de>
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL version 3
* @category Stud.IP
*/
class ForumVisit {
/**
* This is the maximum number of seconds that unread entries are
* marked as new.
*/
const LAST_VISIT_MAX = 7776000; // 90 days
/**
* return number of new entries since last visit up to 3 month ago
*
* @param string $parent_id the seminar_id for the entries
* @param string $visitdate count all entries newer than this timestamp
*
* @return int the number of entries
*/
static function getCount($parent_id, $visitdate)
{
if ($visitdate < time() - ForumVisit::LAST_VISIT_MAX) {
$visitdate = time() - ForumVisit::LAST_VISIT_MAX;
}
$constraints = ForumEntry::getConstraints($parent_id);
$stmt = DBManager::get()->prepare("SELECT COUNT(*) FROM forum_entries
WHERE lft >= :lft AND rgt <= :rgt AND user_id != :user_id
AND seminar_id = :seminar_id
AND topic_id != seminar_id
AND chdate > :lastvisit");
$stmt->bindParam(':user_id', $GLOBALS['user']->id);
$stmt->bindParam(':lft', $constraints['lft']);
$stmt->bindParam(':rgt', $constraints['rgt']);
$stmt->bindParam(':seminar_id', $constraints['seminar_id']);
$stmt->bindParam(':lastvisit', $visitdate);
$stmt->execute();
return $stmt->fetchColumn();
}
/**
* Set the seminar denoted by the passed id as visited by the currently
* logged in user
*
* @param string $seminar_id
*/
static function setVisit($seminar_id) {
$type = get_object_type($seminar_id, words('fak inst sem'));
if ($type === 'fak') {
$type = 'inst';
}
if (self::getVisit($seminar_id) < object_get_visit($seminar_id, $type, false, false)) {
self::setVisitdates($seminar_id);
}
}
/**
* Stores the visitdate in last_visitdate and sets the current time for as new visitdate
*
* @param string $seminar_id the seminar that has been entered
*/
static function setVisitdates($seminar_id) {
$stmt = DBManager::get()->prepare('SELECT visitdate FROM forum_visits
WHERE user_id = ? AND seminar_id = ?');
$stmt->execute([$GLOBALS['user']->id, $seminar_id]);
$visitdate = $stmt->fetchColumn();
$stmt = DBManager::get()->prepare("REPLACE INTO forum_visits
(user_id, seminar_id, visitdate, last_visitdate)
VALUES (?, ?, UNIX_TIMESTAMP(), ?)");
$stmt->execute([$GLOBALS['user']->id, $seminar_id, $visitdate]);
}
/**
* returns visitdate and last_visitdate for the passed seminar and the
* currently logged in user
*
* @staticvar array $visit
*
* @param string $seminar_id the seminar to fetch the visitdates for
* @return mixed an array containing visitdate and last_visitdate
*/
private static function getVisitDates($seminar_id)
{
static $visit = [];
// no costly checking for root or nobody necessary
if ($GLOBALS['perm']->have_perm('root') || $GLOBALS['user']->id == 'nobody') {
$tstamp = mktime(23, 59, 00, date('m'), 31, date('y'));
return ['visit' => $tstamp, 'last_visitdate' => $tstamp];
}
if (!isset($visit[$seminar_id])) {
$visit[$seminar_id] = [];
}
if (!isset($visit[$seminar_id][$GLOBALS['user']->id])) {
$stmt = DBManager::get()->prepare("SELECT visitdate, last_visitdate FROM forum_visits
WHERE seminar_id = ? AND user_id = ?");
$stmt->execute([$seminar_id, $GLOBALS['user']->id]);
$visit[$seminar_id][$GLOBALS['user']->id] = $stmt->fetch(PDO::FETCH_ASSOC);
// no entry for this seminar yet present
if (!$visit[$seminar_id][$GLOBALS['user']->id]) {
// set visitdate to current time
$visit[$seminar_id][$GLOBALS['user']->id] = [
'visit' => time() - ForumVisit::LAST_VISIT_MAX,
'last_visitdate' => time() - ForumVisit::LAST_VISIT_MAX
];
}
// prevent visit-dates from being older than LAST_VISIT_MAX allows
foreach ($visit[$seminar_id][$GLOBALS['user']->id] as $type => $date) {
if ($date < time() - ForumVisit::LAST_VISIT_MAX) {
$visit[$seminar_id][$GLOBALS['user']->id][$type] = time() - ForumVisit::LAST_VISIT_MAX;
}
}
}
return $visit[$seminar_id][$GLOBALS['user']->id];
}
/**
* return the last_visitdate for the passed seminar and currently logged in user
*
* @param string $seminar_id the seminar to get the last_visitdate for
* @return int a timestamp
*/
static function getLastVisit($seminar_id)
{
$visit = self::getVisitDates($seminar_id);
return $visit['last_visitdate'];
}
/**
* return the visitdate for the passed seminar and currently logged in user
*
* @param string $seminar_id the seminar to get the visitdate for
* @return int a timestamp
*/
static function getVisit($seminar_id)
{
$visit = self::getVisitDates($seminar_id);
return $visit['visitdate'] ?? 0;
}
}
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