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

// Show logs
process.env.DEBUG = process.env.DEBUG || 'nuxt:*'

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

const { Nuxt, Builder, Generator } = 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
      --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') {
  console.error(`> Could not load config file ${argv['config-file']}`)
  process.exit(1)
}
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()

nuxt.hook('generate:distRemoved', function () {
  debug('Destination folder cleaned')
})

nuxt.hook('generate:distCopied', function () {
  debug('Static & build files copied')
})

nuxt.hook('generate:page', function (page) {
  debug('Generate file: ' + page.path)
})

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

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

  if (errors.length) {
    const report = errors.map(({ type, route, error }) => {
      /* istanbul ignore if */
      if (type === 'unhandled') {
        return `Route: '${route}'\n${error.stack}`
      } else {
        return `Route: '${route}' thrown an error: \n` + JSON.stringify(error)
      }
    })
    console.error('==== Error report ==== \n' + report.join('\n\n')) // eslint-disable-line no-console
  }
})

generator.generate(generateOptions)
  .then(() => {
    debug('Generate done')
    process.exit(0)
  })
  .catch((err) => {
    console.error(err)
    process.exit(1)
  })