<?php
namespace FrontGlut\Core;

defined( 'ABSPATH' ) || exit;

/** Transient based throttling: hit() returns false once the limit is exceeded. */
class RateLimiter {

	public static function key( $bucket, $who = '' ) {
		return 'frontglut_rl_' . md5( $bucket . '|' . ( $who ? $who : Audit::ip() ) );
	}

	/** Count an attempt. @return bool true if still allowed. */
	public static function hit( $bucket, $limit, $window, $who = '' ) {
		$k = self::key( $bucket, $who );
		$n = (int) get_transient( $k ) + 1;
		set_transient( $k, $n, $window );
		return $n <= $limit;
	}

	public static function blocked( $bucket, $limit, $who = '' ) {
		return (int) get_transient( self::key( $bucket, $who ) ) >= $limit;
	}

	public static function reset( $bucket, $who = '' ) {
		delete_transient( self::key( $bucket, $who ) );
	}
}