import { randomBytes, createHmac, randomUUID } from 'crypto';

export function newId() {
  return randomUUID().replace(/-/g, '');
}

export function genRefCode() {
  // 6 uppercase alphanumeric chars — customer puts this in transfer description
  return randomBytes(4).toString('base64url').slice(0, 6).toUpperCase();
}

export function normalizeRut(rut) {
  if (!rut) return null;
  // Strip dots, lowercase → '12345678-9' or '123456789'
  return rut.replace(/\./g, '').toLowerCase();
}

export function hmacSign(secret, payload) {
  return createHmac('sha256', secret).update(payload).digest('hex');
}

// Parse CLP amount from BCI (arrives as string like "1500" or "1500.00")
export function parsePesos(raw) {
  if (raw == null) return null;
  const n = Math.round(parseFloat(String(raw)));
  return isNaN(n) ? null : n;
}