/* eslint-disable */
import assert from 'assert'
import { Delayer } from '../../language-client/utils/async'
import { wait } from '../../util/index'

test('Delayer', () => {
  let count = 0
  let factory = () => {
    return Promise.resolve(++count)
  }

  let delayer = new Delayer(0)
  let promises: Thenable<any>[] = []

  assert(!delayer.isTriggered())

  promises.push(delayer.trigger(factory).then((result) => { assert.equal(result, 1); assert(!delayer.isTriggered()) }))
  assert(delayer.isTriggered())

  promises.push(delayer.trigger(factory).then((result) => { assert.equal(result, 1); assert(!delayer.isTriggered()) }))
  assert(delayer.isTriggered())

  promises.push(delayer.trigger(factory).then((result) => { assert.equal(result, 1); assert(!delayer.isTriggered()) }))
  assert(delayer.isTriggered())

  return Promise.all(promises).then(() => {
    assert(!delayer.isTriggered())
  }).finally(() => {
    delayer.dispose()
  })
})

test('Delayer - forceDelivery', async () => {
  let count = 0
  let factory = () => {
    return Promise.resolve(++count)
  }

  let delayer = new Delayer(150)
  delayer.forceDelivery()
  delayer.trigger(factory).then((result) => { assert.equal(result, 1); assert(!delayer.isTriggered()) })
  await wait(10)
  delayer.forceDelivery()
  expect(count).toBe(1)
  void delayer.trigger(factory)
  await wait(10)
  delayer.cancel()
  expect(count).toBe(1)
})

test('Delayer - last task should be the one getting called', function() {
  let factoryFactory = (n: number) => () => {
    return Promise.resolve(n)
  }

  let delayer = new Delayer(0)
  let promises: Thenable<any>[] = []

  assert(!delayer.isTriggered())

  promises.push(delayer.trigger(factoryFactory(1)).then((n) => { assert.equal(n, 3) }))
  promises.push(delayer.trigger(factoryFactory(2)).then((n) => { assert.equal(n, 3) }))
  promises.push(delayer.trigger(factoryFactory(3)).then((n) => { assert.equal(n, 3) }))

  const p = Promise.all(promises).then(() => {
    assert(!delayer.isTriggered())
  })

  assert(delayer.isTriggered())

  return p
})