class BruteForce {
  constructor(code) {
    this.code = code
    this.chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    this.url = "https://www.myteamspeak.com/userarea/badges/redeem"
    this.unknowns = code.split("").filter(s => s === "?").length
    this.count = Math.pow(this.chars.length, this.unknowns)
    this.checked = 0
    this.current = new Array(this.unknowns).fill(0)
    this.done = false
    this.found = false
  }

  send(data) {
    return fetch(this.url, {
      method: "POST",
      credentials: "include",
      headers: { "Content-Type": "application/x-www-form-urlencoded" },
      body: BruteForce.encodeBody(data),
    })
  }

  getCode(increment = false) {
    let str = this.code
    this.current.forEach(i => str = str.replace("?", this.chars[i]))
    if (!increment) return str
    this.checked++
    this.done = !this.current.reverse().some((c, i) => {
      return (c >= this.chars.length-1) ? (this.current[i] = 0, false) : (this.current[i]++, true)
    })
    this.current.reverse()
    return str
  }

  async getToken() {
    const data = await fetch(this.url).then(res => res.text())
    const match = data.match(/<input\sname="_token"\stype="hidden"\svalue="(?<token>[a-z0-9]{40})">/i)
    if (!match) throw new Error("No valid Redeem Form token found!")
    return match.groups.token
  }

  static encodeBody(data) {
    return Object.keys(data)
      .map(k => `${encodeURIComponent(k)}=${encodeURIComponent(data[k])}`)
      .join("&")
  }

  async run() {
    if (this.done) return this.found
    while (!this.done) {
      const code = this.getCode(true)
      const res = await this.send({ _token: await this.getToken(), ts_redeem_code: code })
      if (res.status !== 200) {
        console.error(`returned with invalid status code! got ${res.status}!`)
        return false
      }
      if (this.checked % 10 === 0) console.log(`${this.checked}/${this.count} - ${(100/this.count*this.checked).toFixed(2)}% done`)
      if (!(/Invalid badge code/).test(await res.text())) {
        this.found = code
        return code
      }
    }
    return false
  }
}

const bruteforce = new BruteForce("AHQH4TL7??")
bruteforce.current = [0, 0]
bruteforce.checked = 0
;(async () => {
  const result = await bruteforce.run()
  console.log("current", bruteforce.current)
  console.log("checked", bruteforce.checked)
  if (result) {
    console.log(`Possible token found: ${result}`)
  } else {
    console.log("No token found!")
  }
})()