var R = require('ramda');
var retryPromise = require('promise-retry');
var retryTwiceEveryHundredMil = retryPromise({ retries: 2, delay: 100 });

var calls = 0;
function resolvesTheForthTime() {
  if (++calls < 4) {
    return Promise.reject(new Error('nope'));
  } else {
    return Promise.resolve('yay!');
  }
}

var tryFnTwiceEveryHundredMil = retryTwiceEveryHundredMil(resolvesTheForthTime);

tryFnTwiceEveryHundredMil()
  .then(function(result){
    // never called here,
    // but if `retries` was >= 3,
    // result would be === 'yay!'
    console.log("success with " + result);
  }).catch(function(err){
    // err instanceof Error === true
    // err.message === 'nope'
    console.error("failed with " + err.message);
  });

// do it again (i.e. tries no. 3, 4 and 5)
tryFnTwiceEveryHundredMil()
.then(function(result){
    // result  === 'yay!'
  },
  function(error)
  {
  	// never reached
  });

var retryWithIncreasingDelay = retryPromise({ retries: 10, delay: function(retryIndex) {
    return 100 * retryIndex;
});

/* time line:

0 > initial fail
0 + 100 > first retry
100 + 200 > second retry
300 + 300 > third retry
600 + 400 > fourth...

var retryTwice = retryPromise({ retries: 2 });
var retryOnceAfterTwoSeconds = retryPromise({ retries: 1, delay: 2000 });
var getRejected = function(){
  return Promise.reject('nope');
};

retryOnceAfterTwoSeconds(retryTwice(getRejected))().then(function(){
  // no way here
}).catch(function(){
  // at this point, `getRejected` will have been called 6 times
});