import * as cp from 'child_process'
import { mkdir, writeFile, readFile } from 'fs/promises'
import { join, isAbsolute } from 'path'
import { tmpdir } from 'os'
import { promisify } from 'util'

const exec = promisify(cp.exec)
export const tests = []

export const setup = async ({ path }) => {
  const dir = `${tmpdir()}/tell-me-vip`

  await mkdir(`${dir}/guests`, { recursive: true })

  const createFilesIn = ({ files, folderPath }) =>
    Promise.all(
      files.map(([fileName, content]) =>
        writeFile(`${folderPath}/${fileName}`, JSON.stringify(content)),
      ),
    )

  const run = async cmd => {
    const cmdPath = isAbsolute(cmd) ? cmd : join(dir, cmd)
    const { stdout } = await exec(`node ${path} ${cmdPath}`)
    const fileContent = await readFile(`vip.txt`, 'utf8').catch(err =>
      err.code === 'ENOENT' ? 'output file not found' : err,
    )
    return { data: fileContent }
  }

  return { tmpPath: dir, run, createFilesIn }
}

tests.push(async ({ randStr, eq, ctx }) => {
  // test when no answers in the folder
  const folderName = `guests-${randStr()}`
  const folderPath = join(ctx.tmpPath, folderName)
  await mkdir(folderPath)

  const { data } = await ctx.run(folderName)
  return eq('', data)
})

tests.push(async ({ randStr, eq, ctx }) => {
  // test when no one said yes
  const files = [
    ['Ubaid_Ballard.json', { answer: 'no' }],
    ['Victoria_Chan.json', { answer: 'no' }],
    ['Dominika_Mullen.json', { answer: 'no' }],
    ['Heath_Denton.json', { answer: 'no' }],
    ['Lilith_Hamilton.json', { answer: 'no' }],
  ]
  const folderName = `guests-${randStr()}`
  const folderPath = join(ctx.tmpPath, folderName)
  await mkdir(folderPath)
  await ctx.createFilesIn({ folderPath, files })

  const { data } = await ctx.run(folderName)
  return eq('', data)
})

tests.push(async ({ randStr, eq, ctx }) => {
  const random = randStr()
  const files = [
    ['Ubaid_Ballard.json', { answer: 'yes' }],
    ['Victoria_Chan.json', { answer: 'yes' }],
    ['Dominika_Mullen.json', { answer: 'no' }],
    ['Heath_Denton.json', { answer: 'no' }],
    ['Lilith_Hamilton.json', { answer: 'yes' }],
    [`${random}_Random.json`, { answer: 'yes' }],
  ]
  const folderName = `guests-${randStr()}`
  const folderPath = join(ctx.tmpPath, folderName)
  await mkdir(folderPath)
  await ctx.createFilesIn({ folderPath, files })

  const { data } = await ctx.run(folderName)
  return eq(
    [
      `1. Ballard Ubaid`,
      `2. Chan Victoria`,
      `3. Hamilton Lilith`,
      `4. Random ${random}`,
    ],
    data.split('\n'),
  )
})

// test error when no arg?...

Object.freeze(tests)