#!/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',
    m: 'mode'
  },
  boolean: ['h'],
  string: ['H', 'c', 'm'],
  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
      --mode, -m [spa|universal|ssr-only] Nuxt Mode (default: universal)
      --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

// Nuxt Mode
if (argv['mode']) {
  options.mode = argv['mode']
}

const nuxt = new Nuxt(options)

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

// Check if SSR Bundle is required
if (nuxt.options.render.ssr === true) {
  const ssrBundlePath = resolve(distDir, 'server-bundle.json')
  if (!fs.existsSync(ssrBundlePath)) {
    // eslint-disable-next-line no-console
    console.error('> No SSR build! Please start with `-m spa` flag or build using `nuxt build -m universal`')
    process.exit(1)
  }
}

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)