'use strict'
const test = require('tape')
const universalify = require('..')

const fn = universalify.fromCallback(function (a, b, cb) {
  setTimeout(() => cb(null, [this, a, b]), 15)
})

const errFn = universalify.fromCallback(function (cb) {
  setTimeout(() => cb(new Error('test')), 15)
})

const falseyErrFn = universalify.fromCallback(function (cb) {
  setTimeout(() => cb(0, 15)) // eslint-disable-line standard/no-callback-literal
})

test('callback function works with callbacks', t => {
  t.plan(4)
  fn.call({ a: 'a' }, 1, 2, (err, arr) => {
    t.ifError(err, 'should not error')
    t.is(arr[0].a, 'a')
    t.is(arr[1], 1)
    t.is(arr[2], 2)
    t.end()
  })
})

test('callback function works with promises', t => {
  t.plan(3)
  fn.call({ a: 'a' }, 1, 2)
    .then(arr => {
      t.is(arr[0].a, 'a')
      t.is(arr[1], 1)
      t.is(arr[2], 2)
      t.end()
    })
    .catch(t.end)
})

test('callbacks function works with promises without modify the original arg array', t => {
  t.plan(2)
  const array = [1, 2]
  fn.apply(this, array).then((arr) => {
    t.is(array.length, 2)
    t.is(arr.length, 3)
    t.end()
  })
})

test('callback function error works with callbacks', t => {
  t.plan(2)
  errFn(err => {
    t.assert(err, 'should error')
    t.is(err.message, 'test')
    t.end()
  })
})

test('callback function error works with promises', t => {
  t.plan(2)
  errFn()
    .then(() => t.end('Promise should not resolve'))
    .catch(err => {
      t.assert(err, 'should error')
      t.is(err.message, 'test')
      t.end()
    })
})

test('should correctly reject on falsey error values', t => {
  t.plan(2)
  falseyErrFn()
    .then(() => t.end('Promise should not resolve'))
    .catch(err => {
      t.assert((err != null), 'should error')
      t.is(err, 0)
      t.end()
    })
})

test('fromCallback() sets correct .name', t => {
  t.plan(1)
  const res = universalify.fromCallback(function hello () {})
  t.is(res.name, 'hello')
  t.end()
})