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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/

namespace phpbb\log;

/**
* The interface for the log-system.
*/
interface log_interface
{
	/**
	* This function returns the state of the log system.
	*
	* @param	string	$type	The log type we want to check. Empty to get
	*							global log status.
	*
	* @return	bool	True if log for the type is enabled
	*/
	public function is_enabled($type = '');

	/**
	* Disable log
	*
	* This function allows disabling the log system or parts of it, for this
	* page call. When add() is called and the type is disabled, the log will
	* not be added to the database.
	*
	* @param	mixed	$type	The log type we want to disable. Empty to
	*						disable all logs. Can also be an array of types.
	*
	* @return	null
	*/
	public function disable($type = '');

	/**
	* Enable log
	*
	* This function allows re-enabling the log system.
	*
	* @param	mixed	$type	The log type we want to enable. Empty to
	*						enable all logs. Can also be an array of types.
	*
	* @return	null
	*/
	public function enable($type = '');

	/**
	* Adds a log entry to the database
	*
	* @param	string		$mode				The mode defines which log_type is used and from which log the entry is retrieved
	* @param	int			$user_id			User ID of the user
	* @param	string		$log_ip				IP address of the user
	* @param	string		$log_operation		Name of the operation
	* @param	int|bool	$log_time			Timestamp when the log entry was added. If false, time() will be used
	* @param	array		$additional_data	More arguments can be added, depending on the log_type
	*
	* @return	int|bool		Returns the log_id, if the entry was added to the database, false otherwise.
	*/
	public function add($mode, $user_id, $log_ip, $log_operation, $log_time = false, $additional_data = array());

	/**
	* Delete entries in the logs
	*
	* @param 	string	$mode		The mode defines which log_type is used and from which log the entries are deleted
	* @param 	array	$conditions	An array of conditions, 3 different  forms are accepted
	* 								1) <key> => <value> transformed into 'AND <key> = <value>' (value should be an integer)
	*								2) <key> => array(<operator>, <value>) transformed into 'AND <key> <operator> <value>' (values can't be an array)
	*								3) <key> => array('IN' => array(<values>)) transformed into 'AND <key> IN <values>'
	*								A special field, keywords, can also be defined. In this case only the log entries that have the keywords in log_operation or log_data will be deleted.
	*/
	public function delete($mode, $conditions = array());

	/**
	* Grab the logs from the database
	*
	* @param	string	$mode			The mode defines which log_type is used and ifrom which log the entry is retrieved
	* @param	bool	$count_logs		Shall we count all matching log entries?
	* @param	int		$limit			Limit the number of entries that are returned
	* @param	int		$offset			Offset when fetching the log entries, f.e. when paginating
	* @param	mixed	$forum_id		Restrict the log entries to the given forum_id (can also be an array of forum_ids)
	* @param	int		$topic_id		Restrict the log entries to the given topic_id
	* @param	int		$user_id		Restrict the log entries to the given user_id
	* @param	int		$log_time		Only get log entries newer than the given timestamp
	* @param	string	$sort_by		SQL order option, e.g. 'l.log_time DESC'
	* @param	string	$keywords		Will only return log entries that have the keywords in log_operation or log_data
	*
	* @return	array			The result array with the logs
	*/
	public function get_logs($mode, $count_logs = true, $limit = 0, $offset = 0, $forum_id = 0, $topic_id = 0, $user_id = 0, $log_time = 0, $sort_by = 'l.log_time DESC', $keywords = '');

	/**
	* Get total log count
	*
	* @return	int			Returns the number of matching logs from the last call to get_logs()
	*/
	public function get_log_count();

	/**
	* Get offset of the last valid page
	*
	* @return	int			Returns the offset of the last valid page from the last call to get_logs()
	*/
	public function get_valid_offset();
}