// Welcome! require() some modules from npm (like you were using browserify)
// and then hit Run Code to run your code on the right side.
// Modules get downloaded from browserify-cdn and bundled in your browser.

const delay = (t) => new Promise((resolve, reject) => {
  setTimeout(() => resolve(delay.DELAY), t)
})

delay.DELAY = Symbol('DELAY')

const timeout = (t) => (p) => Promise.race([p, delay(t)]).then(
  (value) => {
  	console.log('timeout?', value === delay.DELAY)
    if (value === delay.DELAY) {
      throw 'Operation timed out'
    }
    return value
  }
)

const retry = (n) => (f) => new Promise((resolve, reject) => {
  const attempt = (n) => {
    if (n > 0) {
      f().then(resolve).catch(() => attempt(n - 1))
    } else {
      return reject(retry.FAILED)
    }
  }
  attempt(n + 1)
})
retry.FAILED = Symbol('RETRY_FAILED')

const getStuff = (...$) => delay(100).then(() => [...$])

getStuff(1, 2, 3)
  .then((x) => console.log('success 1', x))
  .catch((x) => console.error('Failure 1', x));

(
  (...$) => timeout(20)(getStuff(...$))
)(1, 2, 3)
  .catch((x) => console.error('Failure', x));

(
  (...$) => retry(2)(() => getStuff(...$))
)(1, 2, 3)
  .then((x) => console.error('Success 2', x))
  .catch((x) => console.error('Failure 2', x));

(
  (...$) => retry(2)(() => timeout(20)(getStuff(...$)))
)(1, 2, 3)
  .then((x) => console.error('Success 3', x))
  .catch((x) => console.error('Failure 3', x));


// (...(() => P) => () => P) => (() => P) => () => P
const compose = (...promiseFns) => promiseFns.reduce((acc, promiseFn) => (f) => acc(promiseFn(f)))

const retryTwiceWithTimeout = compose(
  (f) => () => retry(2)(f),
  (f) => () => timeout(20)(f())
 )

const getStuffSafe = (...$) => retryTwiceWithTimeout(() => getStuff(...$))()

getStuffSafe(1, 2, 3)
  .then((x) => console.log('success compose', x))
  .catch((x) => console.error('Failure compose', x))