<?php
namespace Advently\Security;

defined( 'ABSPATH' ) || exit;

/**
 * Fixed-window counter: at most $max hits per key per $window seconds.
 */
final class RateLimiter {

	/** @var Store */
	private $store;

	/** @var int */
	private $max;

	/** @var int */
	private $window;

	public function __construct( Store $store, int $max, int $window ) {
		$this->store  = $store;
		$this->max    = $max;
		$this->window = $window;
	}

	/**
	 * Counts one hit; false when this hit is over the limit.
	 */
	public function hit( string $key ): bool {
		return $this->store->incr( $key, $this->window ) <= $this->max;
	}

	/**
	 * Whether the key is already over the limit, without counting a hit.
	 */
	public function exceeded( string $key ): bool {
		return $this->store->get( $key ) > $this->max;
	}
}