const inspect = require('util').inspect
const { URL } = require('url')
const ansistyles = require('ansistyles')
const log = require('npmlog')
const npmProfile = require('npm-profile')
const qrcodeTerminal = require('qrcode-terminal')
const Table = require('cli-table3')

const npm = require('./npm.js')
const otplease = require('./utils/otplease.js')
const output = require('./utils/output.js')
const pulseTillDone = require('./utils/pulse-till-done.js')
const readUserInfo = require('./utils/read-user-info.js')
const usageUtil = require('./utils/usage.js')

const usage = usageUtil(
  'npm profile enable-2fa [auth-only|auth-and-writes]\n',
  'npm profile disable-2fa\n',
  'npm profile get [<key>]\n',
  'npm profile set <key> <value>'
)

const completion = (opts, cb) => {
  var argv = opts.conf.argv.remain
  const subcommands = ['enable-2fa', 'disable-2fa', 'get', 'set']

  if (!argv[2])
    return cb(null, subcommands)

  switch (argv[2]) {
    case 'enable-2fa':
    case 'enable-tfa':
      return cb(null, ['auth-and-writes', 'auth-only'])

    case 'disable-2fa':
    case 'disable-tfa':
    case 'get':
    case 'set':
      return cb(null, [])
    default:
      return cb(new Error(argv[2] + ' not recognized'))
  }
}

const cmd = (args, cb) => profile(args).then(() => cb()).catch(cb)

const profile = async (args) => {
  if (args.length === 0)
    throw new Error(usage)

  log.gauge.show('profile')

  const [subcmd, ...opts] = args

  switch (subcmd) {
    case 'enable-2fa':
    case 'enable-tfa':
    case 'enable2fa':
    case 'enabletfa':
      return enable2fa(opts)
    case 'disable-2fa':
    case 'disable-tfa':
    case 'disable2fa':
    case 'disabletfa':
      return disable2fa()
    case 'get':
      return get(opts)
    case 'set':
      return set(opts)
    default:
      throw new Error('Unknown profile command: ' + subcmd)
  }
}

const knownProfileKeys = [
  'name',
  'email',
  'two-factor auth',
  'fullname',
  'homepage',
  'freenode',
  'twitter',
  'github',
  'created',
  'updated',
]

const get = async args => {
  const tfa = 'two-factor auth'
  const conf = { ...npm.flatOptions }

  const info = await pulseTillDone.withPromise(npmProfile.get(conf))

  if (!info.cidr_whitelist)
    delete info.cidr_whitelist

  if (conf.json) {
    output(JSON.stringify(info, null, 2))
    return
  }

  // clean up and format key/values for output
  const cleaned = {}
  for (const key of knownProfileKeys)
    cleaned[key] = info[key] || ''

  const unknownProfileKeys = Object.keys(info).filter((k) => !(k in cleaned))
  for (const key of unknownProfileKeys)
    cleaned[key] = info[key] || ''

  delete cleaned.tfa
  delete cleaned.email_verified
  cleaned.email += info.email_verified ? ' (verified)' : '(unverified)'

  if (info.tfa && !info.tfa.pending)
    cleaned[tfa] = info.tfa.mode
  else
    cleaned[tfa] = 'disabled'

  if (args.length) {
    const values = args // comma or space separated
      .join(',')
      .split(/,/)
      .filter((arg) => arg.trim() !== '')
      .map((arg) => cleaned[arg])
      .join('\t')
    output(values)
  } else {
    if (conf.parseable) {
      for (const key of Object.keys(info)) {
        if (key === 'tfa')
          output(`${key}\t${cleaned[tfa]}`)
        else
          output(`${key}\t${info[key]}`)
      }
    } else {
      const table = new Table()
      for (const key of Object.keys(cleaned))
        table.push({ [ansistyles.bright(key)]: cleaned[key] })

      output(table.toString())
    }
  }
}

const writableProfileKeys = [
  'email',
  'password',
  'fullname',
  'homepage',
  'freenode',
  'twitter',
  'github',
]

const set = async (args) => {
  const conf = { ...npm.flatOptions }
  const prop = (args[0] || '').toLowerCase().trim()

  let value = args.length > 1 ? args.slice(1).join(' ') : null

  const readPasswords = async () => {
    const newpassword = await readUserInfo.password('New password: ')
    const confirmedpassword = await readUserInfo.password('       Again:     ')

    if (newpassword !== confirmedpassword) {
      log.warn('profile', 'Passwords do not match, please try again.')
      return readPasswords()
    }

    return newpassword
  }

  if (prop !== 'password' && value === null)
    throw new Error('npm profile set <prop> <value>')

  if (prop === 'password' && value !== null) {
    throw new Error(
      'npm profile set password\n' +
      'Do not include your current or new passwords on the command line.')
  }

  if (writableProfileKeys.indexOf(prop) === -1) {
    throw new Error(`"${prop}" is not a property we can set. ` +
      `Valid properties are: ` + writableProfileKeys.join(', '))
  }

  if (prop === 'password') {
    const current = await readUserInfo.password('Current password: ')
    const newpassword = await readPasswords()

    value = { old: current, new: newpassword }
  }

  // FIXME: Work around to not clear everything other than what we're setting
  const user = await pulseTillDone.withPromise(npmProfile.get(conf))
  const newUser = {}

  for (const key of writableProfileKeys)
    newUser[key] = user[key]

  newUser[prop] = value

  const result = await otplease(conf, conf => npmProfile.set(newUser, conf))

  if (conf.json)
    output(JSON.stringify({ [prop]: result[prop] }, null, 2))
  else if (conf.parseable)
    output(prop + '\t' + result[prop])
  else if (result[prop] != null)
    output('Set', prop, 'to', result[prop])
  else
    output('Set', prop)
}

const enable2fa = async (args) => {
  if (args.length > 1)
    throw new Error('npm profile enable-2fa [auth-and-writes|auth-only]')

  const mode = args[0] || 'auth-and-writes'
  if (mode !== 'auth-only' && mode !== 'auth-and-writes') {
    throw new Error(
      `Invalid two-factor authentication mode "${mode}".\n` +
      'Valid modes are:\n' +
      '  auth-only - Require two-factor authentication only when logging in\n' +
      '  auth-and-writes - Require two-factor authentication when logging in ' +
      'AND when publishing'
    )
  }

  const conf = { ...npm.flatOptions }
  if (conf.json || conf.parseable) {
    throw new Error(
      'Enabling two-factor authentication is an interactive operation and ' +
      (conf.json ? 'JSON' : 'parseable') + ' output mode is not available'
    )
  }

  const info = {
    tfa: {
      mode: mode,
    },
  }

  // if they're using legacy auth currently then we have to
  // update them to a bearer token before continuing.
  const auth = getAuth(conf)

  if (!auth.basic && !auth.token) {
    throw new Error(
      'You need to be logged in to registry ' +
      `${conf.registry} in order to enable 2fa`
    )
  }

  if (auth.basic) {
    log.info('profile', 'Updating authentication to bearer token')
    const result = await npmProfile.createToken(
      auth.basic.password, false, [], conf
    )

    if (!result.token) {
      throw new Error(
        `Your registry ${conf.registry} does not seem to ` +
        'support bearer tokens. Bearer tokens are required for ' +
        'two-factor authentication'
      )
    }

    npm.config.setCredentialsByURI(conf.registry, { token: result.token })
    await npm.config.save('user')
  }

  log.notice('profile', 'Enabling two factor authentication for ' + mode)
  const password = await readUserInfo.password()
  info.tfa.password = password

  log.info('profile', 'Determine if tfa is pending')
  const userInfo = await pulseTillDone.withPromise(npmProfile.get(conf))

  if (userInfo && userInfo.tfa && userInfo.tfa.pending) {
    log.info('profile', 'Resetting two-factor authentication')
    await pulseTillDone.withPromise(
      npmProfile.set({ tfa: { password, mode: 'disable' } }, conf)
    )
  } else if (userInfo && userInfo.tfa) {
    if (conf.otp)
      conf.otp = conf.otp
    else {
      const otp = await readUserInfo.otp(
        'Enter one-time password from your authenticator app: '
      )
      conf.otp = otp
    }
  }

  log.info('profile', 'Setting two-factor authentication to ' + mode)
  const challenge = await pulseTillDone.withPromise(npmProfile.set(info, conf))

  if (challenge.tfa === null) {
    output('Two factor authentication mode changed to: ' + mode)
    return
  }

  const badResponse = typeof challenge.tfa !== 'string'
    || !/^otpauth:[/][/]/.test(challenge.tfa)
  if (badResponse) {
    throw new Error(
      'Unknown error enabling two-factor authentication. Expected otpauth URL' +
      ', got: ' + inspect(challenge.tfa)
    )
  }

  const otpauth = new URL(challenge.tfa)
  const secret = otpauth.searchParams.get('secret')
  const code = await qrcode(challenge.tfa)

  output(
    'Scan into your authenticator app:\n' + code + '\n Or enter code:', secret
  )

  const interactiveOTP =
    await readUserInfo.otp('And an OTP code from your authenticator: ')

  log.info('profile', 'Finalizing two-factor authentication')

  const result = await npmProfile.set({ tfa: [interactiveOTP] }, conf)

  output(
    '2FA successfully enabled. Below are your recovery codes, ' +
    'please print these out.'
  )
  output(
    'You will need these to recover access to your account ' +
    'if you lose your authentication device.'
  )

  for (const tfaCode of result.tfa)
    output('\t' + tfaCode)
}

const getAuth = conf => {
  const creds = npm.config.getCredentialsByURI(conf.registry)
  const auth = {}

  if (creds.token)
    auth.token = creds.token
  else if (creds.username)
    auth.basic = { username: creds.username, password: creds.password }
  else if (creds.auth) {
    const basic = Buffer.from(creds.auth, 'base64').toString().split(':', 2)
    auth.basic = { username: basic[0], password: basic[1] }
  }

  if (conf.otp)
    auth.otp = conf.otp

  return auth
}

const disable2fa = async args => {
  const conf = { ...npm.flatOptions }
  const info = await pulseTillDone.withPromise(npmProfile.get(conf))

  if (!info.tfa || info.tfa.pending) {
    output('Two factor authentication not enabled.')
    return
  }

  const password = await readUserInfo.password()

  if (!conf.otp) {
    const msg = 'Enter one-time password from your authenticator app: '
    conf.otp = await readUserInfo.otp(msg)
  }

  log.info('profile', 'disabling tfa')

  await pulseTillDone.withPromise(npmProfile.set({
    tfa: { password: password, mode: 'disable' },
  }, conf))

  if (conf.json)
    output(JSON.stringify({ tfa: false }, null, 2))
  else if (conf.parseable)
    output('tfa\tfalse')
  else
    output('Two factor authentication disabled.')
}

const qrcode = url =>
  new Promise((resolve) => qrcodeTerminal.generate(url, resolve))

module.exports = Object.assign(cmd, { usage, completion })