#!/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 { Nuxt, Builder, Generator } = require('../')
const resolve = require('path').resolve
const debug = require('debug')('nuxt:build')
debug.color = 2 // Force green color

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

if (argv.help) {
  console.log(`
    Description
      Compiles the application for production deployment
    Usage
      $ nuxt build <dir>
    Options
      --analyze, -a        Launch webpack-bundle-analyzer to optimize your bundles.
      --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
  `)
  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
}
// Create production build when calling `nuxt build`
options.dev = false

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

// Analyze option
options.build = options.build || {}
if (argv.analyze) {
  options.build.analyze = true
}

debug('Building...')
const nuxt = new Nuxt(options)
const builder = new Builder(nuxt)

if (options.mode !== 'spa') {
  // Build for SSR app
  builder.build()
    .then(() => debug('Building done'))
    .catch((err) => {
      console.error(err)
      process.exit(1)
    })
} else {
  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
    }
  })

  // Disable minify to get exact results of nuxt start
  nuxt.options.generate.minify = false
  // Generate on spa mode
  new Generator(nuxt, builder).generate({ build: true }).then(() => {
    if (!nuxt.options.dev) {
      console.log(`✓ You can now directly upload ${nuxt.options.generate.dir}/ or start server using "nuxt start"`)
    }
  })
}