<?php

/**
 * Class to add entries to the event log. Technically this class belongs to the
 * eventlog module, but since it is used in so many places, this helper resides
 * in the general inc directory instead of the eventlog's inc directory, since
 * that would require to add "if (Module::isAvailable('eventlog')) { ... }"
 * all over the place. Instead, the availability check was moved here.
 */
class EventLog
{
		
	private static function log($type, $message, $details)
	{
		if (!Module::isAvailable('eventlog')) {
			// Eventlog module does not exist; the eventlog table might not exist, so bail out
			error_log($message);
			return;
		}
		if (mb_strlen($message) > 255) {
			$message = mb_substr($message, 0, 255);
		}
		if (mb_strlen($details) > 65535) {
			$details = mb_substr($details, 0, 65535);
		}
		$data = [
			'type' => $type,
			'message' => $message,
			'details' => $details
		];
		Database::exec("INSERT INTO eventlog (dateline, logtypeid, description, extra)"
			. " VALUES (UNIX_TIMESTAMP(), :type, :message, :details)", $data, true);
		self::applyFilterRules('#serverlog', $data);
	}
	
	public static function failure($message, $details = '')
	{
		self::log('failure', $message, $details);
		Property::setLastWarningId(Database::lastInsertId());
	}
	
	public static function warning($message, $details = '')
	{
		self::log('warning', $message, $details);
		Property::setLastWarningId(Database::lastInsertId());
	}
	
	public static function info($message, $details = '')
	{
		self::log('info', $message, $details);
	}
	
	/**
	 * DELETE ENTIRE EVENT LOG!
	 */
	public static function clear()
	{
		if (!Module::isAvailable('eventlog'))
			return;
		Database::exec("TRUNCATE eventlog");
	}

	/**
	 * @param string $type the event. Will either be client state like ~poweron, ~runstate etc. or a client log type
	 * @param array $data A structured array containing event specific data that can be matched.
	 */
	public static function applyFilterRules(string $type, array $data)
	{
		if (!Module::isAvailable('eventlog'))
			return;
		FilterRuleProcessor::applyFilterRules($type, $data);
	}

}