Lewerow/Zurvan

function randomElement(arr) {
  return arr[Math.floor(Math.random() * arr.length)];
}

function firstElement(array) {
  return array[0];
}

var policies = {
  FIFO: {
    selectGroup: function(timeouts, intervals) {
      return timeouts[0].sequenceNumber < intervals[0].sequenceNumber
        ? timeouts
        : intervals;
    },
    selectElement: firstElement
  },
  'Timeouts-First-FIFO': {
    selectGroup: function(timeouts) {
      return timeouts;
    },
    selectElement: firstElement
  },
  'Intervals-First-FIFO': {
    selectGroup: function(_, intervals) {
      return intervals;
    },
    selectElement: firstElement
  },
  Random: {
    selectGroup: function(timeouts, intervals) {
      return [].concat(timeouts, intervals);
    },
    selectElement: randomElement
  },
  'Timeouts-First-Random': {
    selectGroup: function(timeouts) {
      return timeouts;
    },
    selectElement: randomElement
  },
  'Intervals-First-Random': {
    selectGroup: function(_, intervals) {
      return intervals;
    },
    selectElement: randomElement
  }
};

module.exports = policies;