'use strict';

const defaultOptions = {
  active: true,
  breakpoints: {},
  delay: 4000,
  jump: false,
  playOnInit: true,
  stopOnFocusIn: true,
  stopOnInteraction: true,
  stopOnMouseEnter: false,
  stopOnLastSnap: false,
  rootNode: null
};

function normalizeDelay(emblaApi, delay) {
  const scrollSnaps = emblaApi.scrollSnapList();
  if (typeof delay === 'number') {
    return scrollSnaps.map(() => delay);
  }
  return delay(scrollSnaps, emblaApi);
}
function getAutoplayRootNode(emblaApi, rootNode) {
  const emblaRootNode = emblaApi.rootNode();
  return rootNode && rootNode(emblaRootNode) || emblaRootNode;
}

function Autoplay(userOptions = {}) {
  let options;
  let emblaApi;
  let destroyed;
  let delay;
  let timerStartTime = null;
  let timerId = 0;
  let autoplayActive = false;
  let mouseIsOver = false;
  let playOnDocumentVisible = false;
  let jump = false;
  function init(emblaApiInstance, optionsHandler) {
    emblaApi = emblaApiInstance;
    const {
      mergeOptions,
      optionsAtMedia
    } = optionsHandler;
    const optionsBase = mergeOptions(defaultOptions, Autoplay.globalOptions);
    const allOptions = mergeOptions(optionsBase, userOptions);
    options = optionsAtMedia(allOptions);
    if (emblaApi.scrollSnapList().length <= 1) return;
    jump = options.jump;
    destroyed = false;
    delay = normalizeDelay(emblaApi, options.delay);
    const {
      eventStore,
      ownerDocument
    } = emblaApi.internalEngine();
    const isDraggable = !!emblaApi.internalEngine().options.watchDrag;
    const root = getAutoplayRootNode(emblaApi, options.rootNode);
    eventStore.add(ownerDocument, 'visibilitychange', visibilityChange);
    if (isDraggable) {
      emblaApi.on('pointerDown', pointerDown);
    }
    if (isDraggable && !options.stopOnInteraction) {
      emblaApi.on('pointerUp', pointerUp);
    }
    if (options.stopOnMouseEnter) {
      eventStore.add(root, 'mouseenter', mouseEnter);
    }
    if (options.stopOnMouseEnter && !options.stopOnInteraction) {
      eventStore.add(root, 'mouseleave', mouseLeave);
    }
    if (options.stopOnFocusIn) {
      emblaApi.on('slideFocusStart', stopAutoplay);
    }
    if (options.stopOnFocusIn && !options.stopOnInteraction) {
      eventStore.add(emblaApi.containerNode(), 'focusout', startAutoplay);
    }
    if (options.playOnInit) startAutoplay();
  }
  function destroy() {
    emblaApi.off('pointerDown', pointerDown).off('pointerUp', pointerUp).off('slideFocusStart', stopAutoplay);
    stopAutoplay();
    destroyed = true;
    autoplayActive = false;
  }
  function setTimer() {
    const {
      ownerWindow
    } = emblaApi.internalEngine();
    ownerWindow.clearTimeout(timerId);
    timerId = ownerWindow.setTimeout(next, delay[emblaApi.selectedScrollSnap()]);
    timerStartTime = new Date().getTime();
    emblaApi.emit('autoplay:timerset');
  }
  function clearTimer() {
    const {
      ownerWindow
    } = emblaApi.internalEngine();
    ownerWindow.clearTimeout(timerId);
    timerId = 0;
    timerStartTime = null;
    emblaApi.emit('autoplay:timerstopped');
  }
  function startAutoplay() {
    if (destroyed) return;
    if (documentIsHidden()) {
      playOnDocumentVisible = true;
      return;
    }
    if (!autoplayActive) emblaApi.emit('autoplay:play');
    setTimer();
    autoplayActive = true;
  }
  function stopAutoplay() {
    if (destroyed) return;
    if (autoplayActive) emblaApi.emit('autoplay:stop');
    clearTimer();
    autoplayActive = false;
  }
  function visibilityChange() {
    if (documentIsHidden()) {
      playOnDocumentVisible = autoplayActive;
      return stopAutoplay();
    }
    if (playOnDocumentVisible) startAutoplay();
  }
  function documentIsHidden() {
    const {
      ownerDocument
    } = emblaApi.internalEngine();
    return ownerDocument.visibilityState === 'hidden';
  }
  function pointerDown() {
    if (!mouseIsOver) stopAutoplay();
  }
  function pointerUp() {
    if (!mouseIsOver) startAutoplay();
  }
  function mouseEnter() {
    mouseIsOver = true;
    stopAutoplay();
  }
  function mouseLeave() {
    mouseIsOver = false;
    startAutoplay();
  }
  function play(jumpOverride) {
    if (typeof jumpOverride !== 'undefined') jump = jumpOverride;
    startAutoplay();
  }
  function stop() {
    if (autoplayActive) stopAutoplay();
  }
  function reset() {
    if (autoplayActive) startAutoplay();
  }
  function isPlaying() {
    return autoplayActive;
  }
  function next() {
    const {
      index
    } = emblaApi.internalEngine();
    const nextIndex = index.clone().add(1).get();
    const lastIndex = emblaApi.scrollSnapList().length - 1;
    const kill = options.stopOnLastSnap && nextIndex === lastIndex;
    if (emblaApi.canScrollNext()) {
      emblaApi.scrollNext(jump);
    } else {
      emblaApi.scrollTo(0, jump);
    }
    emblaApi.emit('autoplay:select');
    if (kill) return stopAutoplay();
    startAutoplay();
  }
  function timeUntilNext() {
    if (!timerStartTime) return null;
    const currentDelay = delay[emblaApi.selectedScrollSnap()];
    const timePastSinceStart = new Date().getTime() - timerStartTime;
    return currentDelay - timePastSinceStart;
  }
  const self = {
    name: 'autoplay',
    options: userOptions,
    init,
    destroy,
    play,
    stop,
    reset,
    isPlaying,
    timeUntilNext
  };
  return self;
}
Autoplay.globalOptions = undefined;

module.exports = Autoplay;
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