<?php

class RateLimiter
{
    /**
     * @param string $ip The IP to check
     * @param string $action A unique string for the action (e.g., '404', 'verify_attempt')
     * @param int $max_requests
     * @param int $window seconds
     * @return bool True if allowed, false if limit exceeded
     */
    public static function checkIsRateLimited($ip, $action, $max_requests, $window)
    {
        // 1. Check if the Cache module is available
        if (!Module::isInstalled('dbmemorycache') || !Module::isEnabled('dbmemorycache')) {
            return false; // Not limited if we can't track it
        }

        $cache = Module::getInstanceByName('dbmemorycache');
        if (!$cache) {
            return false;
        }

        // 2. Generate unique key for this IP + Action
        $cacheKey = hash('sha256', 'bot_limit_' . $action . '_' . $ip);

        // 3. Get current count
        $currentCount = 0;
        if ($cache->existsValue($cacheKey)) {
            $currentCount = (int) $cache->getValue($cacheKey);
        }

        $currentCount++;

        // 4. Save back with the window (Resets timer on every hit = Sliding Window)
        $cache->setValue($cacheKey, $currentCount, $window);

        // 5. Return status
        return ($currentCount > $max_requests);
    }
}