const attempts = new Map<string, { count: number; resetAt: number }>()

export function checkRateLimit(
  key: string,
  maxAttempts = 5,
  windowMs = 60000,
): { allowed: boolean; remaining: number; resetAt: number } {
  const now = Date.now()
  const entry = attempts.get(key)

  if (!entry || now > entry.resetAt) {
    attempts.set(key, { count: 1, resetAt: now + windowMs })
    return { allowed: true, remaining: maxAttempts - 1, resetAt: now + windowMs }
  }

  entry.count++

  if (entry.count > maxAttempts) {
    return { allowed: false, remaining: 0, resetAt: entry.resetAt }
  }

  return { allowed: true, remaining: maxAttempts - entry.count, resetAt: entry.resetAt }
}

// Cleanup stale entries every 5 minutes
setInterval(() => {
  const now = Date.now()
  for (const [key, entry] of attempts) {
    if (now > entry.resetAt) attempts.delete(key)
  }
}, 300000)