<?php
/**
*
* @package phpBB3
* @copyright (c) 2010 phpBB Group
* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
*
*/

/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
	exit;
}

/**
* Prune all forums cron task.
*
* It is intended to be invoked from system cron.
* This task will find all forums for which pruning is enabled, and will
* prune all forums as necessary.
*
* @package phpBB3
*/
class phpbb_cron_task_core_prune_all_forums extends phpbb_cron_task_base
{
	/**
	* Runs this cron task.
	*
	* @return void
	*/
	public function run()
	{
		global $phpbb_root_path, $phpEx, $db;

		if (!function_exists('auto_prune'))
		{
			include($phpbb_root_path . 'includes/functions_admin.' . $phpEx);
		}

		$sql = 'SELECT forum_id, prune_next, enable_prune, prune_days, prune_viewed, forum_flags, prune_freq
			FROM ' . FORUMS_TABLE . "
			WHERE enable_prune = 1 
				AND prune_next < " . time();
		$result = $db->sql_query($sql);
		while ($row = $db->sql_fetchrow($result))
		{
			if ($row['prune_days'])
			{
				auto_prune($row['forum_id'], 'posted', $row['forum_flags'], $row['prune_days'], $row['prune_freq']);
			}

			if ($row['prune_viewed'])
			{
				auto_prune($row['forum_id'], 'viewed', $row['forum_flags'], $row['prune_viewed'], $row['prune_freq']);
			}
		}
		$db->sql_freeresult($result);
	}

	/**
	* Returns whether this cron task can run, given current board configuration.
	*
	* This cron task will only run when system cron is utilised.
	*
	* @return bool
	*/
	public function is_runnable()
	{
		global $config;
		return (bool) $config['use_system_cron'];
	}
}
