/**
 * Simple in-memory rate limiter.
 * Extracted from index.ts for modularity.
 */

const rateLimitMap = new Map<string, { count: number; resetAt: number }>();
const RATE_LIMIT = { maxRequests: 30, windowMs: 60_000 }; // 30 req/min

export function checkRateLimit(key: string): boolean {
  const now = Date.now();
  const entry = rateLimitMap.get(key);
  if (!entry || now > entry.resetAt) {
    rateLimitMap.set(key, { count: 1, resetAt: now + RATE_LIMIT.windowMs });
    return true;
  }
  if (entry.count >= RATE_LIMIT.maxRequests) return false;
  entry.count++;
  return true;
}

// Clean up stale entries every 5 minutes
setInterval(() => {
  const now = Date.now();
  for (const [key, entry] of rateLimitMap) {
    if (now > entry.resetAt) rateLimitMap.delete(key);
  }
}, 300_000).unref();