#!/usr/bin/env node

const path = require('path')
const { promisify } = require('util')
const { exec } = require('child_process')
const arg = require('arg')
const recursiveCopy = require('recursive-copy')
const commandExists = require('command-exists').sync
const pkg = require('../package.json')

const COMMAND = 'copy-aragon-ui-assets'
const VERSION = pkg.version

const HELP = `
  Usage: ${COMMAND} [-hv] [-n dirname] <destination>

  Options:

    -h, --help               display this help and exit
    -v, --version            display the version number
    -n, --dirname <dirname>  set the directory name (default: aragon-ui)

  Examples:

    $ ${COMMAND} .
    $ ${COMMAND} -n aragon-ui ./public
`

const argspec = {
  '--help': Boolean,
  '--version': Boolean,
  '--dirname': String,
  '-h': '--help',
  '-v': '--version',
  '-n': '--dirname',
}

const error = message => console.error(`\n  ${COMMAND} error: ${message}`)

async function main(argv, argspec) {
  const args = arg(argspec, { permissive: true })

  if (args['--help']) return HELP
  if (args['--version']) return VERSION

  if (!args._[0]) {
    throw new Error(`no destination directory provided\n${HELP}`)
  }

  const source = path.resolve(__dirname, '..', path.dirname(pkg.main))
  const destination = path.resolve(
    process.cwd(),
    args._[0],
    args['--dirname'] || 'aragon-ui'
  )

  const copy = commandExists('rsync') ? rsyncCopy : nodeCopy

  return copy(source, destination).then(
    () =>
      `\naragonUI assets copied to ${path.relative(
        process.cwd(),
        destination
      )}`
  )
}

const rsyncCopy = async (from, to) =>
  promisify(exec)(
    `mkdir -p "${to}" && rsync --recursive --update --times "${from}/" "${to}"`
  )

const nodeCopy = async (from, to) =>
  recursiveCopy(from, to, { overwrite: true })

main(process.argv, argspec).then(
  out => {
    if (out) console.log(out)
    process.exit(0)
  },
  err => {
    error(err.message)
    process.exit(1)
  }
)