const buckets = new Map<string, number[]>();

export function assertRateLimit(
  key: string,
  maxRequests: number,
  windowMs: number,
) {
  const now = Date.now();
  const start = now - windowMs;
  const hits = (buckets.get(key) ?? []).filter((ts) => ts >= start);

  if (hits.length >= maxRequests) {
    throw new Error("Rate limit exceeded. Please try again in a minute.");
  }

  hits.push(now);
  buckets.set(key, hits);
}