"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.generateKsuid = generateKsuid;
const crypto_1 = require("crypto");
// KSUID custom epoch (May 13, 2014 in Unix seconds)
const KSUID_EPOCH = BigInt(1400000000);
const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
const BASE = BigInt(62);
/**
* Generates a K-Sortable Unique Identifier (KSUID): a 27-char base62 string
* encoding 4 bytes of timestamp + 16 bytes of random data.
* Compatible with https://github.com/segmentio/ksuid
*/
function generateKsuid() {
const ts = BigInt(Math.floor(Date.now() / 1000)) - KSUID_EPOCH;
const buf = Buffer.allocUnsafe(20);
buf.writeUInt32BE(Number(ts), 0);
(0, crypto_1.randomBytes)(16).copy(buf, 4);
return base62Encode(buf);
}
function base62Encode(buf) {
let n = BigInt("0x" + buf.toString("hex"));
let result = "";
// 27 digits: ceil(160 / log2(62)) = 27
for (let i = 0; i < 27; i++) {
result = ALPHABET[Number(n % BASE)] + result;
n /= BASE;
}
return result;
}
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