const uuidRegex =
  /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$/;

export function isValidUuid(uuid: string) {
  return uuidRegex.test(uuid);
}

/**
 * Exponential backoff with full jitter and a minimum delay floor.
 *
 * - Uses exponential growth capped at maxDelayMs
 * - Applies full jitter to spread retries uniformly across the window
 * - Enforces a minimum delay to avoid tight retry loops
 *
 * Example (baseDelayMs = 1000):
 *   Try 1:   250ms – 1,000ms
 *   Try 2:   250ms – 2,000ms
 *   Try 3:   250ms – 4,000ms
 *   Try 4:   250ms – 8,000ms
 *   Try 5+:  250ms – maxDelayMs
 */
export function exponentialBackoffFullJitter(
  tries: number,
  {
    baseDelayMs,
    maxDelayMs,
    minDelayMs = 250,
  }: {
    baseDelayMs: number;
    maxDelayMs: number;
    minDelayMs?: number;
  },
): number {
  const exponentialDelay = Math.min(
    maxDelayMs,
    baseDelayMs * Math.pow(2, Math.max(0, tries - 1)),
  );

  if (exponentialDelay <= minDelayMs) {
    return minDelayMs;
  }

  const jitterRange = exponentialDelay - minDelayMs;
  return minDelayMs + Math.floor(Math.random() * jitterRange);
}