import { promisify } from 'util'
import test from 'ava'
import { resolve } from 'path'
import fs from 'fs'
import stdMocks from 'std-mocks'
import { Nuxt, Builder } from '..'

const readFile = promisify(fs.readFile)
const rootDir = resolve(__dirname, './fixtures/dll')
const dllDir = resolve(rootDir, '.cache/client-dll')

const checkCache = (lib) => {
  return async (t) => {
    const manifest = await readFile(resolve(dllDir, `./${lib}-manifest.json`), 'utf-8')
    t.truthy(JSON.parse(manifest).name)
    t.true(fs.existsSync(resolve(dllDir, `./${JSON.parse(manifest).name}.js`)))
  }
}

let nuxt

test.before('Init Nuxt.js', async t => {
  let config = require(resolve(rootDir, 'nuxt.config.js'))
  config.rootDir = rootDir
  config.dev = true
  nuxt = new Nuxt(config)
  await new Builder(nuxt).build()
})

test('Check vue cache', checkCache('vue'))

test('Check vue-meta cache', checkCache('vue-meta'))

test('Check vue-router cache', checkCache('vue-router'))

test('Build with DllReferencePlugin', async t => {
  stdMocks.use()
  await new Builder(nuxt).build()
  stdMocks.restore()
  const output = stdMocks.flush()
  const dllLog = output.stdout.filter(value => value === 'Using dll for 3 libs\n')
  t.true(dllLog.length === 1)
})

// Close server and ask nuxt to stop listening to file changes
test.after('Closing nuxt.js', t => {
  nuxt.close()
})