<?php
namespace YTKNS;

// Prevent running cron script during maintenance
if(YTKNS_MAINTENANCE)
    return;

if(!defined('YTKNS_SEM_NAME'))
    define('YTKNS_SEM_NAME', 'b');
if(!defined('YTKNS_SFM_PATH'))
    define('YTKNS_SFM_PATH', sys_get_temp_dir() . DIRECTORY_SEPARATOR . '{04884071-d334-4388-947a-4fd8c4d4f4ea}');

if(!is_file(YTKNS_SFM_PATH))
    touch(YTKNS_SFM_PATH);

$ftok = ftok(YTKNS_SFM_PATH, YTKNS_SEM_NAME);
$semaphore = sem_get($ftok, 1);
if(!sem_acquire($semaphore))
    die('Failed to acquire semaphore.' . PHP_EOL);

require_once __DIR__ . '/startup.php';

// Destroy old sessions
UserSession::purge();

// Resynchronise use counts
Upload::resync(EFFECT_UPLOADS);

// Destroy orphaned uploads
Upload::purgeOrphans();

// Get task queue
$taskQueue = ZoneTask::queue();

// Plow through tasks
// TODO: make task functions modular
while($task = array_shift($taskQueue)) {
    if(!isset($zoneInfo) || $zoneInfo->getId() !== $task->getZoneId())
        $zoneInfo = $task->getZone();

    switch($task->getName()) {
        case 'screenshot':
            $zoneInfo->takeScreenshot();
            break;
    }

    $task->delete();
}

sem_release($semaphore);