const { inspect } = require('node:util')
const { URL } = require('node:url')
const { log, output } = require('proc-log')
const { get, set, createToken } = require('npm-profile')
const qrcodeTerminal = require('qrcode-terminal')
const { otplease } = require('../utils/auth.js')
const readUserInfo = require('../utils/read-user-info.js')
const BaseCommand = require('../base-cmd.js')

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

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

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

class Profile extends BaseCommand {
  static description = 'Change settings on your registry profile'
  static name = 'profile'
  static usage = [
    'enable-2fa [auth-only|auth-and-writes]',
    'disable-2fa',
    'get [<key>]',
    'set <key> <value>',
  ]

  static params = [
    'registry',
    'json',
    'parseable',
    'otp',
  ]

  static async completion (opts) {
    var argv = opts.conf.argv.remain

    if (!argv[2]) {
      return ['enable-2fa', 'disable-2fa', 'get', 'set']
    }

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

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

  async exec (args) {
    if (args.length === 0) {
      throw this.usageError()
    }

    const [subcmd, ...opts] = args

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

  async get (args) {
    const tfa = 'two-factor auth'
    const info = await get({ ...this.npm.flatOptions })

    if (!info.cidr_whitelist) {
      delete info.cidr_whitelist
    }

    if (this.npm.config.get('json')) {
      output.buffer(info)
      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.standard(values)
    } else {
      if (this.npm.config.get('parseable')) {
        for (const key of Object.keys(info)) {
          if (key === 'tfa') {
            output.standard(`${key}\t${cleaned[tfa]}`)
          } else {
            output.standard(`${key}\t${info[key]}`)
          }
        }
      } else {
        for (const [key, value] of Object.entries(cleaned)) {
          output.standard(`${key}: ${value}`)
        }
      }
    }
  }

  async set (args) {
    const conf = { ...this.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 get(conf)
    const newUser = {}

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

    newUser[prop] = value

    const result = await otplease(this.npm, conf, c => set(newUser, c))

    if (this.npm.config.get('json')) {
      output.buffer({ [prop]: result[prop] })
    } else if (this.npm.config.get('parseable')) {
      output.standard(prop + '\t' + result[prop])
    } else if (result[prop] != null) {
      output.standard('Set', prop, 'to', result[prop])
    } else {
      output.standard('Set', prop)
    }
  }

  async enable2fa (args) {
    const conf = { ...this.npm.flatOptions }

    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'
      )
    }

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

    const userInfo = await get(conf)

    if (!userInfo?.tfa?.pending && userInfo?.tfa?.mode === mode) {
      output.standard('Two factor authentication is already enabled and set to ' + mode)
      return
    }

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

    // if they're using legacy auth currently then we have to update them to a bearer token before continuing.
    const creds = this.npm.config.getCredentialsByURI(this.npm.config.get('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 (!auth.basic && !auth.token) {
      throw new Error(
        'You need to be logged in to registry ' +
        `${this.npm.config.get('registry')} in order to enable 2fa`
      )
    }

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

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

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

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

    if (userInfo && userInfo.tfa && userInfo.tfa.pending) {
      log.info('profile', 'Resetting two-factor authentication')
      await set({ tfa: { password, mode: 'disable' } }, conf)
    }

    log.info('profile', 'Setting two-factor authentication to ' + mode)
    const challenge = await otplease(this.npm, conf, o => set(info, o))

    if (challenge.tfa && challenge.tfa.mode) {
      output.standard('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.standard('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 set({ tfa: [interactiveOTP] }, conf)

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

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

  async disable2fa () {
    const opts = { ...this.npm.flatOptions }
    const info = await get(opts)

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

    const password = await readUserInfo.password()

    log.info('profile', 'disabling tfa')
    await otplease(this.npm, opts, o => set({ tfa: { password: password, mode: 'disable' } }, o))

    if (this.npm.config.get('json')) {
      output.buffer({ tfa: false })
    } else if (this.npm.config.get('parseable')) {
      output.standard('tfa\tfalse')
    } else {
      output.standard('Two factor authentication disabled.')
    }
  }
}

module.exports = Profile
