#!/usr/bin/env node

const fs = require('fs')
const parseArgs = require('minimist')
const { Nuxt } = require('../')
const { join, resolve } = require('path')

const argv = parseArgs(process.argv.slice(2), {
  alias: {
    h: 'help',
    H: 'hostname',
    p: 'port',
    c: 'config-file'
  },
  boolean: ['h'],
  string: ['H', 'c'],
  default: {
    c: 'nuxt.config.js'
  }
})

if (argv.hostname === '') {
  console.error(`> Provided hostname argument has no value`)
  process.exit(1)
}

if (argv.help) {
  console.log(`
    Description
      Starts the application in production mode.
      The application should be compiled with \`nuxt build\` first.
    Usage
      $ nuxt start <dir> -p <port number> -H <hostname>
    Options
      --port, -p          A port number on which to start the application
      --hostname, -H      Hostname on which to start the application
      --config-file, -c   Path to Nuxt.js config file (default: nuxt.config.js)
      --help, -h          Displays this message
  `)
  process.exit(0)
}

const rootDir = resolve(argv._[0] || '.')
const nuxtConfigFile = resolve(rootDir, argv['config-file'])

let options = {}

if (fs.existsSync(nuxtConfigFile)) {
  options = require(nuxtConfigFile)
} else if (argv['config-file'] !== 'nuxt.config.js') {
  console.error(`> Could not load config file ${argv['config-file']}`)
  process.exit(1)
}

if (typeof options.rootDir !== 'string') {
  options.rootDir = rootDir
}

// Force production mode (no webpack middleware called)
options.dev = false

// Check if project is built for production
const distDir = join(options.rootDir, options.buildDir || '.nuxt', 'dist')
if (!fs.existsSync(join(distDir, 'server-bundle.json'))) {
  console.error('> No build files found, please run `nuxt build` before launching `nuxt start`') // eslint-disable-line no-console
  process.exit(1)
}

const nuxt = new Nuxt(options)
const port = argv.port || process.env.PORT || process.env.npm_package_config_nuxt_port
const host = argv.hostname || process.env.HOST || process.env.npm_package_config_nuxt_host
nuxt.listen(port, host)