import crypto from 'crypto'

export function hmac(input, key, out) {
  return out
    ? crypto.createHmac('sha1', key).update(input).digest(out)
    : crypto.createHmac('sha1', key).update(input).digest('hex')
}

export function genRandomString(length) {
  return crypto
    .randomBytes(Math.ceil(length / 2))
    .toString('hex')
    .slice(0, length)
}

export function sha512(password, salt) {
  let hash = crypto.createHmac('sha512', salt)
  hash.update(password)
  let value = hash.digest('hex')
  return {
    salt: salt,
    passwordHash: value,
  }
}

export function sha1(str) {
  const md5sum = crypto.createHash('sha1')
  md5sum.update(str)
  str = md5sum.digest('hex')
  return str
}

export function hmacSha256(text: string, secret: string) {
  const mac = crypto.createHmac('sha256', secret)
  const data = mac.update(text).digest('hex').toLowerCase()
  console.log(`HmacSHA256 rawContent is [${text}], key is [${secret}], hash result is [${data}]`)
  return data
}

export function md5(str) {
  const md5sum = crypto.createHash('md5')
  md5sum.update(str)
  str = md5sum.digest('hex')
  return str
}

export function createSign(secretKey, paramStr, timestamp) {
  paramStr = `${paramStr}:${timestamp}:${secretKey}`
  return sha1(paramStr)
}

export function checkSign({
  secretKey,
  data,
  sign,
  signKeys,
}: {
  secretKey: string
  data: {}
  sign: string
  signKeys: string[]
}) {
  signKeys.sort()
  let signStr = ''
  for (let key of signKeys) {
    if (signStr.length > 0) {
      signStr += '&'
    }
    signStr += `${key}=${data[key]}`
  }
  console.log(signStr)
  let sign1 = hmacSha256(signStr, secretKey)
  return sign1 === sign
}