// Tiny in-memory sliding-window rate limiter.
// Acceptable for single-instance Nitro on Netlify; swap to Mongo/Upstash if
// we move to multi-instance.
const buckets = new Map()

export function rateLimit(key, { max, windowMs }) {
  const now = Date.now()
  const arr = (buckets.get(key) || []).filter((t) => now - t < windowMs)
  if (arr.length >= max) return false
  arr.push(now)
  buckets.set(key, arr)
  return true
}

// Test helper — clears all buckets so each test starts clean.
export function resetRateLimit() {
  buckets.clear()
}