#!/usr/bin/env node

import { resolve, join } from 'path'
import { exists } from 'mz/fs'
import parseArgs from 'minimist'
import build from '../server/build'

const argv = parseArgs(process.argv.slice(2), {
  alias: {
    h: 'help'
  },
  boolean: ['h']
})

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

    Usage
      $ next build <dir>

    <dir> represents where the compiled .next folder should go.
    If no directory is provided, .next will be created in the current directory
  `)
  process.exit(0)
}

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

// Check if pages dir exists and warn if not
exists(dir)
.then(async () => {
  if (!(await exists(join(dir, 'pages')))) {
    if (await exists(join(dir, '..', 'pages'))) {
      console.error('> No `pages` directory found. Did you mean to run `next` in the parent (`../`) directory?')
    } else {
      console.error('> Couldn\'t find a `pages` directory. Please create one under the project root')
    }
    process.exit(1)
  }
})
.catch((err) => {
  console.error(err)
  process.exit(1)
})

build(dir)
.catch((err) => {
  console.error(err)
  process.exit(1)
})