var frame = 0, timeout = 0, interval = 0, pokeDelay = 1e3, taskHead, taskTail, clockLast = 0, clockNow = 0, clockSkew = 0, clock = typeof performance === "object" && performance.now ? performance : Date, setFrame = typeof window === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function(f) {
  setTimeout(f, 17);
};
function now() {
  return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
}
function clearNow() {
  clockNow = 0;
}
function Timer() {
  this._call = this._time = this._next = null;
}
Timer.prototype = timer.prototype = {
  constructor: Timer,
  restart: function(callback, delay, time) {
    if (typeof callback !== "function") throw new TypeError("callback is not a function");
    time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
    if (!this._next && taskTail !== this) {
      if (taskTail) taskTail._next = this;
      else taskHead = this;
      taskTail = this;
    }
    this._call = callback;
    this._time = time;
    sleep();
  },
  stop: function() {
    if (this._call) {
      this._call = null;
      this._time = Infinity;
      sleep();
    }
  }
};
function timer(callback, delay, time) {
  var t = new Timer();
  t.restart(callback, delay, time);
  return t;
}
function timerFlush() {
  now();
  ++frame;
  var t = taskHead, e;
  while (t) {
    if ((e = clockNow - t._time) >= 0) t._call.call(void 0, e);
    t = t._next;
  }
  --frame;
}
function wake() {
  clockNow = (clockLast = clock.now()) + clockSkew;
  frame = timeout = 0;
  try {
    timerFlush();
  } finally {
    frame = 0;
    nap();
    clockNow = 0;
  }
}
function poke() {
  var now2 = clock.now(), delay = now2 - clockLast;
  if (delay > pokeDelay) clockSkew -= delay, clockLast = now2;
}
function nap() {
  var t0, t1 = taskHead, t2, time = Infinity;
  while (t1) {
    if (t1._call) {
      if (time > t1._time) time = t1._time;
      t0 = t1, t1 = t1._next;
    } else {
      t2 = t1._next, t1._next = null;
      t1 = t0 ? t0._next = t2 : taskHead = t2;
    }
  }
  taskTail = t0;
  sleep(time);
}
function sleep(time) {
  if (frame) return;
  if (timeout) timeout = clearTimeout(timeout);
  var delay = time - clockNow;
  if (delay > 24) {
    if (time < Infinity) timeout = setTimeout(wake, time - clock.now() - clockSkew);
    if (interval) interval = clearInterval(interval);
  } else {
    if (!interval) clockLast = clock.now(), interval = setInterval(poke, pokeDelay);
    frame = 1, setFrame(wake);
  }
}
export {
  Timer,
  now,
  timer,
  timerFlush
};
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