#!/usr/bin/env node
/* eslint-disable no-console */

const fs = require('fs')
const parseArgs = require('minimist')
const debug = require('debug')('nuxt:generate')

const { Nuxt, Builder, Generator, Utils } = require('..')
const resolve = require('path').resolve

const argv = parseArgs(process.argv.slice(2), {
  alias: {
    h: 'help',
    c: 'config-file',
    s: 'spa',
    u: 'universal'
  },
  boolean: ['h', 's', 'u', 'build'],
  string: ['c'],
  default: {
    c: 'nuxt.config.js',
    build: true
  }
})

if (argv.help) {
  console.log(`
    Description
      Generate a static web application (server-rendered)
    Usage
      $ nuxt generate <dir>
    Options
      --spa              Launch in SPA mode
      --universal        Launch in Universal mode (default)
      --config-file, -c  Path to Nuxt.js config file (default: nuxt.config.js)
      --help, -h         Displays this message
      --no-build         Just run generate for faster builds when just dynamic routes changed. Nuxt build is needed before this command.
  `)
  process.exit(0)
}

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

var options = {}
if (fs.existsSync(nuxtConfigFile)) {
  options = require(nuxtConfigFile)
} else if (argv['config-file'] !== 'nuxt.config.js') {
  Utils.fatalError('Could not load config file: ' + argv['config-file'])
}
if (typeof options.rootDir !== 'string') {
  options.rootDir = rootDir
}
options.dev = false // Force production mode (no webpack middleware called)

// Nuxt Mode
options.mode =
  (argv['spa'] && 'spa') || (argv['universal'] && 'universal') || options.mode

debug('Generating...')
const nuxt = new Nuxt(options)
const builder = new Builder(nuxt)
const generator = new Generator(nuxt, builder)

const generateOptions = {
  init: true,
  build: argv['build']
}

const s = Date.now()

// Setup hooks

nuxt.hook('error', (_err, from) => Utils.fatalError(_err, from))

nuxt.hook('generate:distRemoved', () => debug('Destination folder cleaned'))

nuxt.hook('generate:distCopied', () => debug('Static & build files copied'))

nuxt.hook('generate:page', page => debug('Generate file: ' + page.path))

nuxt.hook('generate:done', (generator, errors) => {
  const duration = Math.round((Date.now() - s) / 100) / 10

  debug(`HTML Files generated in ${duration}s`)

  if (errors.length) {
    /* eslint-disable no-console */
    console.log('\n Generate errors summary:')
    console.log('\n' + errors.toString())
  }
})

generator
  .generate(generateOptions)
  .then(() => {
    debug('Generate done')
    process.exit(0)
  })
  .catch(err => {
    Utils.fatalError(err)
  })