#!/usr/bin/env node

// Packages
const chalk = require('chalk')
const minimist = require('minimist')
const table = require('text-table')
const ms = require('ms')

// Ours
const login = require('../lib/login')
const cfg = require('../lib/cfg')
const {error} = require('../lib/error')
const toHost = require('../lib/to-host')
const strlen = require('../lib/strlen')
const NowDomains = require('../lib/domains')

const argv = minimist(process.argv.slice(2), {
  string: ['config', 'token'],
  boolean: ['help', 'debug', 'external', 'force'],
  alias: {
    help: 'h',
    config: 'c',
    debug: 'd',
    external: 'e',
    force: 'f',
    token: 't'
  }
})

const subcommand = argv._[0]

// options
const help = () => {
  console.log(`
  ${chalk.bold('𝚫 now domains')} <ls | add | rm> <domain>

  ${chalk.dim('Options:')}

    -h, --help              Output usage information
    -c ${chalk.bold.underline('FILE')}, --config=${chalk.bold.underline('FILE')}  Config file
    -d, --debug             Debug mode [off]
    -e, --external          Use external DNS server
    -f, --force             Skip DNS verification
    -t ${chalk.bold.underline('TOKEN')}, --token=${chalk.bold.underline('TOKEN')} Login token

  ${chalk.dim('Examples:')}

  ${chalk.gray('–')} Lists all your domains:

      ${chalk.cyan('$ now domains ls')}

  ${chalk.gray('–')} Adds a domain name:

      ${chalk.cyan(`$ now domains add ${chalk.underline('my-app.com')}`)}

      Make sure the domain's DNS nameservers are at least 2 of these:

      ${chalk.gray('–')} ${chalk.underline('california.zeit.world')}    ${chalk.dim('173.255.215.107')}
      ${chalk.gray('–')} ${chalk.underline('london.zeit.world')}        ${chalk.dim('178.62.47.76')}
      ${chalk.gray('–')} ${chalk.underline('newark.zeit.world')}        ${chalk.dim('173.255.231.87')}
      ${chalk.gray('–')} ${chalk.underline('amsterdam.zeit.world')}     ${chalk.dim('188.226.197.55')}
      ${chalk.gray('–')} ${chalk.underline('dallas.zeit.world')}        ${chalk.dim('173.192.101.194')}
      ${chalk.gray('–')} ${chalk.underline('paris.zeit.world')}         ${chalk.dim('37.123.115.172')}
      ${chalk.gray('–')} ${chalk.underline('singapore.zeit.world')}     ${chalk.dim('119.81.97.170')}
      ${chalk.gray('–')} ${chalk.underline('sydney.zeit.world')}        ${chalk.dim('52.64.171.200')}
      ${chalk.gray('–')} ${chalk.underline('frankfurt.zeit.world')}     ${chalk.dim('91.109.245.139')}
      ${chalk.gray('–')} ${chalk.underline('iowa.zeit.world')}          ${chalk.dim('23.236.59.22')}

      ${chalk.yellow('NOTE:')} running ${chalk.dim('`now alias`')} will automatically register your domain
      if it's configured with these nameservers (no need to ${chalk.dim('`domain add`')}).

      For more details head to ${chalk.underline('https://zeit.world')}.

  ${chalk.gray('–')} Removing a domain:

      ${chalk.cyan('$ now domain rm my-app.com')}

      or

      ${chalk.cyan('$ now domain rm domainId')}

      To get the list of domain ids, use ${chalk.dim('`now domains ls`')}.

  ${chalk.gray('–')} Adding and verifying a domain name using zeit.world nameservers:

      ${chalk.cyan('$ now domain add my-app.com')}

      The command will tell you if the domain was verified succesfully. In case the domain was not verified succesfully you should retry adding the domain after some time.

  ${chalk.gray('–')} Adding and verifying a domain name using an external nameserver:

      ${chalk.cyan('$ now domain add -e my-app.com')}

      and follow the verification instructions if requested. Finally, rerun the same command after completing the verification step.
`)
}

// options
const debug = argv.debug
const apiUrl = argv.url || 'https://api.zeit.co'

if (argv.config) {
  cfg.setConfigFile(argv.config)
}

const exit = code => {
  // we give stdout some time to flush out
  // because there's a node bug where
  // stdout writes are asynchronous
  // https://github.com/nodejs/node/issues/6456
  setTimeout(() => process.exit(code || 0), 100)
}

if (argv.help || !subcommand) {
  help()
  exit(0)
} else {
  const config = cfg.read()

  Promise.resolve(argv.token || config.token || login(apiUrl))
  .then(async token => {
    try {
      await run(token)
    } catch (err) {
      if (err.userError) {
        error(err.message)
      } else {
        error(`Unknown error: ${err.stack}`)
      }
      exit(1)
    }
  })
  .catch(e => {
    error(`Authentication error – ${e.message}`)
    exit(1)
  })
}

async function run(token) {
  const domain = new NowDomains(apiUrl, token, {debug})
  const args = argv._.slice(1)

  switch (subcommand) {
    case 'ls':
    case 'list': {
      if (args.length !== 0) {
        error('Invalid number of arguments')
        return exit(1)
      }

      const start_ = new Date()
      const domains = await domain.ls()
      domains.sort((a, b) => new Date(b.created) - new Date(a.created))
      const current = new Date()
      const header = [['', 'id', 'dns', 'url', 'verified', 'created'].map(s => chalk.dim(s))]
      const out = domains.length === 0 ? null : table(header.concat(domains.map(domain => {
        const ns = domain.isExternal ? 'external' : 'zeit.world'
        const url = chalk.underline(`https://${domain.name}`)
        const time = chalk.gray(ms(current - new Date(domain.created)) + ' ago')
        return [
          '',
          domain.uid,
          ns,
          url,
          domain.verified,
          time
        ]
      })), {align: ['l', 'r', 'l', 'l', 'l', 'l'], hsep: ' '.repeat(2), stringLength: strlen})

      const elapsed_ = ms(new Date() - start_)
      console.log(`> ${domains.length} domain${domains.length === 1 ? '' : 's'} found ${chalk.gray(`[${elapsed_}]`)}`)

      if (out) {
        console.log('\n' + out + '\n')
      }

      break
    }
    case 'rm':
    case 'remove': {
      if (args.length !== 1) {
        error('Invalid number of arguments')
        return exit(1)
      }

      const _target = String(args[0])
      if (!_target) {
        const err = new Error('No domain specified')
        err.userError = true
        throw err
      }

      const _domains = await domain.ls()
      const _domain = findDomain(_target, _domains)

      if (!_domain) {
        const err = new Error(`Domain not found by "${_target}". Run ${chalk.dim('`now domains ls`')} to see your domains.`)
        err.userError = true
        throw err
      }

      try {
        const confirmation = (await readConfirmation(domain, _domain, _domains)).toLowerCase()
        if (confirmation !== 'y' && confirmation !== 'yes') {
          console.log('\n> Aborted')
          process.exit(0)
        }

        const start = new Date()
        await domain.rm(_domain.name)
        const elapsed = ms(new Date() - start)
        console.log(`${chalk.cyan('> Success!')} Domain ${chalk.bold(_domain.uid)} removed [${elapsed}]`)
      } catch (err) {
        error(err)
        exit(1)
      }
      break
    }
    case 'add':
    case 'set': {
      if (args.length !== 1) {
        error('Invalid number of arguments')
        return exit(1)
      }

      const start = new Date()
      const name = String(args[0])
      const {uid, code, verified, verifyToken, created} = await domain.add(name, argv.force, argv.external)
      const elapsed = ms(new Date() - start)
      if (created && verified) {
        console.log(`${chalk.cyan('> Success!')} Domain ${chalk.bold(chalk.underline(name))} ${chalk.dim(`(${uid})`)} added [${elapsed}]`)
      } else if (verified) {
        console.log(`${chalk.cyan('> Success!')} Domain ${chalk.bold(chalk.underline(name))} ${chalk.dim(`(${uid})`)} verified [${elapsed}]`)
      } else if (verifyToken) {
        console.log(`> Verification required: Please add the following TXT record on the external DNS server: _now.${name}: ${verifyToken}`)
      } else if (code === 'not_modified') {
        console.log(`${chalk.cyan('> Success!')} Domain ${chalk.bold(chalk.underline(name))} ${chalk.dim(`(${uid})`)} already exists [${elapsed}]`)
      } else {
        console.log('> Verification required: Please rerun this command after some time')
      }
      break
    }
    default:
      error('Please specify a valid subcommand: ls | add | rm')
      help()
      exit(1)
  }

  domain.close()
}

async function readConfirmation(domain, _domain) {
  return new Promise(resolve => {
    const time = chalk.gray(ms(new Date() - new Date(_domain.created)) + ' ago')
    const tbl = table(
      [[_domain.uid, chalk.underline(`https://${_domain.name}`), time]],
      {align: ['l', 'r', 'l'], hsep: ' '.repeat(6)}
    )

    process.stdout.write('> The following domain will be removed permanently\n')
    process.stdout.write('  ' + tbl + '\n')

    if (_domain.aliases.length > 0) {
      process.stdout.write(`> ${chalk.yellow('Warning!')} This domain's ` +
      `${chalk.bold(_domain.aliases.length + ' alias' + (_domain.aliases.length === 1 ? '' : 'es'))} ` +
      `will be removed. Run ${chalk.dim('`now alias ls`')} to list.\n`)
    }

    process.stdout.write(`  ${chalk.bold.red('> Are you sure?')} ${chalk.gray('[y/N] ')}`)

    process.stdin.on('data', d => {
      process.stdin.pause()
      resolve(d.toString().trim())
    }).resume()
  })
}

function findDomain(val, list) {
  return list.find(d => {
    if (d.uid === val) {
      if (debug) {
        console.log(`> [debug] matched domain ${d.uid} by uid`)
      }

      return true
    }

    // match prefix
    if (d.name === toHost(val)) {
      if (debug) {
        console.log(`> [debug] matched domain ${d.uid} by name ${d.name}`)
      }

      return true
    }

    return false
  })
}