#!/usr/bin/env node
import { resolve, join } from 'path'
import { existsSync } from 'fs'
import parseArgs from 'minimist'
import exportApp from '../export'
import { printAndExit } from '../server/lib/utils'

const argv = parseArgs(process.argv.slice(2), {
  alias: {
    h: 'help',
    s: 'silent',
    o: 'outdir'
  },
  boolean: ['h'],
  default: {
    s: false,
    o: null
  }
})

if (argv.help) {
  console.log(`
    Description
      Exports the application for production deployment

    Usage
      $ next export [options] <dir>

    <dir> represents where the compiled dist folder should go.
    If no directory is provided, the 'out' folder will be created in the current directory.

    Options
      -h - list this help
      -o - set the output dir (defaults to 'out')
      -s - do not print any messages to console
  `)
  process.exit(0)
}

const dir = resolve(argv._[0] || '.')

// Check if pages dir exists and warn if not
if (!existsSync(dir)) {
  printAndExit(`> No such directory exists as the project root: ${dir}`)
}

if (!existsSync(join(dir, 'pages'))) {
  if (existsSync(join(dir, '..', 'pages'))) {
    printAndExit('> No `pages` directory found. Did you mean to run `next` in the parent (`../`) directory?')
  }

  printAndExit('> Couldn\'t find a `pages` directory. Please create one under the project root')
}

const options = {
  silent: argv.silent,
  threads: argv.threads,
  concurrency: argv.concurrency,
  outdir: argv.outdir ? resolve(argv.outdir) : resolve(dir, 'out')
}

exportApp(dir, options)
  .then(() => {
    printAndExit('Export successful', 0)
  })
  .catch((err) => {
    printAndExit(err)
  })