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

const args = arg({
  // Types
  '--help': Boolean,
  '--silent': Boolean,
  '--outdir': String,
  '--threads': Number,
  '--concurrency': Number,

  // Aliases
  '-h': '--help',
  '-s': '--silent',
  '-o': '--outdir',
})

if (args['--help']) {
  // tslint:disable-next-line
  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(args._[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: args['--silent'] || false,
  threads: args['--threads'],
  concurrency: args['--concurrency'],
  outdir: args['--outdir'] ? resolve(args['--outdir']) : join(dir, 'out'),
}

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