src/utils/orderNumber.js

const crypto = require("crypto");

/**
 * Human-friendly, hard-to-guess order number, e.g. AYN-20260825-4F9K2C.
 * Not used as a security token (the order is always looked up by its
 * MongoDB _id + the requesting user's identity), just a reference the
 * customer can quote in support emails.
 */
function generateOrderNumber() {
  const date = new Date().toISOString().slice(0, 10).replace(/-/g, "");
  const random = crypto.randomBytes(4).toString("hex").toUpperCase().slice(0, 6);
  return `AYN-${date}-${random}`;
}

module.exports = { generateOrderNumber };