uuid.ts

/**
 * Parse a UUID string into a Uint8Array
 */
export function parseUuid(uuid: string): Uint8Array {
  const hex = uuid.replace(/-/g, "");
  if (!/^[0-9a-fA-F]{32}$/.test(hex)) {
    throw new Error("Invalid UUID string");
  }

  const bytes = new Uint8Array(16);
  for (let i = 0; i < 16; i++) {
    bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
  }
  return bytes;
}

/**
 * Format a Uint8Array into a UUID string
 */
export function formatUuid(bytes: Uint8Array): string {
  if (bytes.length !== 16) {
    throw new Error("UUID must be 16 bytes");
  }

  const hex = Array.from(bytes)
    .map((b) => b.toString(16).padStart(2, "0"))
    .join("");

  return [
    hex.slice(0, 8),
    hex.slice(8, 12),
    hex.slice(12, 16),
    hex.slice(16, 20),
    hex.slice(20),
  ].join("-");
}