import loadBabelConfig from '../lib/load-babel-config'
import { resolve } from 'path'
import {
  createReadStream,
  createWriteStream,
  readFileSync,
  renameSync
} from 'fs'
import clearModule from 'clear-module'
import cache from '../lib/cache'

describe('load-babel-config.js', () => {
  beforeEach(() => {
    cache.flushAll()
    clearModule.all()
  })

  it('reads default babel if there is no .babelrc', () => {
    const babelRcPath = resolve(__dirname, '../.babelrc')
    const babelRcOriginal = JSON.parse(readFileSync(babelRcPath, { encoding: 'utf8' }))
    const tempPath = resolve(__dirname, '../.renamed')
    renameSync(babelRcPath, tempPath)
    const babelConfig = loadBabelConfig()
    try {
      expect(babelConfig).not.toBe(babelRcOriginal)
    } catch (err) {
      renameSync(tempPath, babelRcPath)
      throw err
    }
    renameSync(tempPath, babelRcPath)
    const babelConfigCached = loadBabelConfig()
    expect(babelConfigCached).not.toBe(babelConfig)
    expect(babelConfigCached).toEqual(babelConfig)
  })

  it('reads default babel if there is .babelrc', () => {
    const babelRcPath = resolve(__dirname, '../.babelrc')
    const babelRcCopiedPath = resolve(__dirname, '../.babelrc_cp')
    createReadStream(babelRcPath).pipe(createWriteStream(babelRcCopiedPath))
    const babelRcOriginal = JSON.parse(readFileSync(babelRcPath, { encoding: 'utf8' }))
    const babelConfig = loadBabelConfig()
    expect(babelConfig).toEqual(babelRcOriginal)
    const tempPath = resolve(__dirname, '../.renamed')
    renameSync(babelRcCopiedPath, tempPath)
    const babelConfigCached = loadBabelConfig()
    try {
      expect(babelConfig).not.toBe(babelConfigCached)
      expect(babelConfig).toEqual(babelConfigCached)
    } catch (err) {
      renameSync(tempPath, babelRcCopiedPath)
      throw err
    }
  })
})