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<?php

/**
* Contao Open Source CMS
* Copyright (C) 2005-2012 Leo Feyer
*
* Formerly known as TYPOlight Open Source CMS.
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, please visit the Free
* Software Foundation website at <http://www.gnu.org/licenses/>.
*
* PHP version 5
* @copyright Leo Feyer 2005-2012
* @author Leo Feyer <http://www.contao.org>
* @package Frontend
* @license LGPL
* @filesource
*/


/**
* Initialize the system
*/
define('TL_MODE', 'FE');
require('system/initialize.php');


/**
* Class CronJob
*
* Cron job controller.
* @copyright Leo Feyer 2005-2012
* @author Leo Feyer <http://www.contao.org>
* @package Controller
*/
class CronJob extends Frontend
{

/**
* Initialize the object (do not remove)
*/
public function __construct()
{
parent::__construct();

// See #4099
define('BE_USER_LOGGED_IN', false);
define('FE_USER_LOGGED_IN', false);
}


/**
* Run the controller
*/
public function run()
{
// Do not run if there is POST data or the last execution was less than five minutes ago
if (!empty($_POST) || $this->hasToWait())
{
return;
}

$intMonthly = date('Ym');
$intWeekly = date('YW');
$intDaily = date('Ymd');
$intHourly = date('YmdH');

// Monthly jobs
if (!empty($GLOBALS['TL_CRON']['monthly']) && $GLOBALS['TL_CONFIG']['cron_monthly'] != $intMonthly)
{
$this->log('Running monthly cron jobs', 'CronJobs run()', TL_CRON);

foreach ($GLOBALS['TL_CRON']['monthly'] as $callback)
{
$this->import($callback[0]);
$this->$callback[0]->$callback[1]();
}

$this->log('Monthly cron jobs complete', 'CronJobs run()', TL_CRON);
$this->Config->update("\$GLOBALS['TL_CONFIG']['cron_monthly']", $intMonthly);
}

// Weekly jobs
elseif (!empty($GLOBALS['TL_CRON']['weekly']) && $GLOBALS['TL_CONFIG']['cron_weekly'] != $intWeekly)
{
$this->log('Running weekly cron jobs', 'CronJobs run()', TL_CRON);

foreach ($GLOBALS['TL_CRON']['weekly'] as $callback)
{
$this->import($callback[0]);
$this->$callback[0]->$callback[1]();
}

$this->log('Weekly cron jobs complete', 'CronJobs run()', TL_CRON);
$this->Config->update("\$GLOBALS['TL_CONFIG']['cron_weekly']", $intWeekly);
}

// Daily jobs
elseif (!empty($GLOBALS['TL_CRON']['daily']) && $GLOBALS['TL_CONFIG']['cron_daily'] != $intDaily)
{
$this->log('Running daily cron jobs', 'CronJobs run()', TL_CRON);

foreach ($GLOBALS['TL_CRON']['daily'] as $callback)
{
$this->import($callback[0]);
$this->$callback[0]->$callback[1]();
}

$this->log('Daily cron jobs complete', 'CronJobs run()', TL_CRON);
$this->Config->update("\$GLOBALS['TL_CONFIG']['cron_daily']", $intDaily);
}

// Hourly jobs
elseif (!empty($GLOBALS['TL_CRON']['hourly']) && $GLOBALS['TL_CONFIG']['cron_hourly'] != $intHourly)
{
$this->log('Running hourly cron jobs', 'CronJobs run()', TL_CRON);

foreach ($GLOBALS['TL_CRON']['hourly'] as $callback)
{
$this->import($callback[0]);
$this->$callback[0]->$callback[1]();
}

$this->log('Hourly cron jobs complete', 'CronJobs run()', TL_CRON);
$this->Config->update("\$GLOBALS['TL_CONFIG']['cron_hourly']", $intHourly);
}
}


/**
* Check whether the last script execution was less than five minutes ago
* @return boolean
*/
protected function hasToWait()
{
$time = time();

// Lock the table
$this->Database->lockTables(array('tl_lock'=>'WRITE'));

// Get the last execution date
$objCron = $this->Database->prepare("SELECT * FROM tl_lock WHERE name='cron'")
->limit(1)
->execute();

// Add the cron entry
if ($objCron->numRows < 1)
{
$this->updateCronTxt($time);
$this->Database->query("INSERT INTO tl_lock (name, tstamp) VALUES ('cron', $time)");
$this->Database->unlockTables();

return false;
}

// Last execution was less than five minutes ago
if ($objCron->tstamp > (time() - 300))
{
$this->Database->unlockTables();
return true;
}

// Store the new value
$this->updateCronTxt($time);
$this->Database->query("UPDATE tl_lock SET tstamp=$time WHERE name='cron'");
$this->Database->unlockTables();

return false;
}


/**
* Update the cron.txt file
* @param integer
*/
protected function updateCronTxt($time)
{
$objFile = new File('system/html/cron.txt');
$objFile->write($time);
$objFile->close();
}
}


/**
* Instantiate controller
*/
$objCronJob = new CronJob();
$objCronJob->run();

?>
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