import crypto from 'node:crypto'
import util from 'node:util'

const scrypt = util.promisify(crypto.scrypt)

const tokenLength = 64

export async function hashPassword(password: string) {
  const salt = crypto.randomBytes(32)

  const hash = (await scrypt(password, salt, 64)) as Buffer

  return Buffer.concat([salt, hash]).toString('base64')
}

export async function verifyPassword(password: string, hash: string) {
  const buf = Buffer.from(hash, 'base64')

  return crypto.timingSafeEqual(buf.subarray(32), (await scrypt(password, buf.subarray(0, 32), 64)) as Buffer)
}

export function generateToken(length = tokenLength) {
  return crypto.randomBytes(length / 2).toString('hex')
}