<?php

declare(strict_types=1);

/**
 * 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(string $type, string $message, string $details, bool $markWarning): void
	{
		if (!Module::isAvailable('eventlog')) {
			// Eventlog module does not exist; the eventlog table might not exist, so bail out
			error_log($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,
		];
		if (Database::exec("INSERT INTO eventlog (dateline, logtypeid, description, extra)"
				. " VALUES (UNIX_TIMESTAMP(), :type, :message, :details)", $data, true) === false) {
			error_log($message);
		} else {
			// Insert ok, see if we should update the "latest warning" id
			$id = Database::lastInsertId();
			if ($id !== 0 && $markWarning) {
				Property::setLastWarningId($id);
			}
		}
		self::applyFilterRules('#serverlog', $data);
	}
	
	public static function failure(string $message, string $details = ''): void
	{
		self::log('failure', $message, $details, true);
	}
	
	public static function warning(string $message, string $details = ''): void
	{
		self::log('warning', $message, $details, true);
	}
	
	public static function info(string $message, string $details = ''): void
	{
		self::log('info', $message, $details, false);
	}
	
	/**
	 * DELETE ENTIRE EVENT LOG!
	 */
	public static function clear(): void
	{
		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 $data): void
	{
		if (!Module::isAvailable('eventlog'))
			return;
		FilterRuleProcessor::applyFilterRules($type, $data);
	}

}