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/* eslint-disable consistent-return */
import { getWindow } from 'ssr-window';
import $ from '../../shared/dom.js';
import { now, nextTick } from '../../shared/utils.js';
export default function Mousewheel(_ref) {
  let {
    swiper,
    extendParams,
    on,
    emit
  } = _ref;
  const window = getWindow();
  extendParams({
    mousewheel: {
      enabled: false,
      releaseOnEdges: false,
      invert: false,
      forceToAxis: false,
      sensitivity: 1,
      eventsTarget: 'container',
      thresholdDelta: null,
      thresholdTime: null
    }
  });
  swiper.mousewheel = {
    enabled: false
  };
  let timeout;
  let lastScrollTime = now();
  let lastEventBeforeSnap;
  const recentWheelEvents = [];

function normalize(e) {
    // Reasonable defaults
    const PIXEL_STEP = 10;
    const LINE_HEIGHT = 40;
    const PAGE_HEIGHT = 800;
    let sX = 0;
    let sY = 0; // spinX, spinY

let pX = 0;
    let pY = 0; // pixelX, pixelY
    // Legacy

if ('detail' in e) {
      sY = e.detail;
    }

if ('wheelDelta' in e) {
      sY = -e.wheelDelta / 120;
    }

if ('wheelDeltaY' in e) {
      sY = -e.wheelDeltaY / 120;
    }

if ('wheelDeltaX' in e) {
      sX = -e.wheelDeltaX / 120;
    } // side scrolling on FF with DOMMouseScroll

if ('axis' in e && e.axis === e.HORIZONTAL_AXIS) {
      sX = sY;
      sY = 0;
    }

pX = sX * PIXEL_STEP;
    pY = sY * PIXEL_STEP;

if ('deltaY' in e) {
      pY = e.deltaY;
    }

if ('deltaX' in e) {
      pX = e.deltaX;
    }

if (e.shiftKey && !pX) {
      // if user scrolls with shift he wants horizontal scroll
      pX = pY;
      pY = 0;
    }

if ((pX || pY) && e.deltaMode) {
      if (e.deltaMode === 1) {
        // delta in LINE units
        pX *= LINE_HEIGHT;
        pY *= LINE_HEIGHT;
      } else {
        // delta in PAGE units
        pX *= PAGE_HEIGHT;
        pY *= PAGE_HEIGHT;
      }
    } // Fall-back if spin cannot be determined

if (pX && !sX) {
      sX = pX < 1 ? -1 : 1;
    }

if (pY && !sY) {
      sY = pY < 1 ? -1 : 1;
    }

return {
      spinX: sX,
      spinY: sY,
      pixelX: pX,
      pixelY: pY
    };
  }

function handleMouseEnter() {
    if (!swiper.enabled) return;
    swiper.mouseEntered = true;
  }

function handleMouseLeave() {
    if (!swiper.enabled) return;
    swiper.mouseEntered = false;
  }

function animateSlider(newEvent) {
    if (swiper.params.mousewheel.thresholdDelta && newEvent.delta < swiper.params.mousewheel.thresholdDelta) {
      // Prevent if delta of wheel scroll delta is below configured threshold
      return false;
    }

if (swiper.params.mousewheel.thresholdTime && now() - lastScrollTime < swiper.params.mousewheel.thresholdTime) {
      // Prevent if time between scrolls is below configured threshold
      return false;
    } // If the movement is NOT big enough and
    // if the last time the user scrolled was too close to the current one (avoid continuously triggering the slider):
    //   Don't go any further (avoid insignificant scroll movement).

if (newEvent.delta >= 6 && now() - lastScrollTime < 60) {
      // Return false as a default
      return true;
    } // If user is scrolling towards the end:
    //   If the slider hasn't hit the latest slide or
    //   if the slider is a loop and
    //   if the slider isn't moving right now:
    //     Go to next slide and
    //     emit a scroll event.
    // Else (the user is scrolling towards the beginning) and
    // if the slider hasn't hit the first slide or
    // if the slider is a loop and
    // if the slider isn't moving right now:
    //   Go to prev slide and
    //   emit a scroll event.

if (newEvent.direction < 0) {
      if ((!swiper.isEnd || swiper.params.loop) && !swiper.animating) {
        swiper.slideNext();
        emit('scroll', newEvent.raw);
      }
    } else if ((!swiper.isBeginning || swiper.params.loop) && !swiper.animating) {
      swiper.slidePrev();
      emit('scroll', newEvent.raw);
    } // If you got here is because an animation has been triggered so store the current time

lastScrollTime = new window.Date().getTime(); // Return false as a default

return false;
  }

function releaseScroll(newEvent) {
    const params = swiper.params.mousewheel;

if (newEvent.direction < 0) {
      if (swiper.isEnd && !swiper.params.loop && params.releaseOnEdges) {
        // Return true to animate scroll on edges
        return true;
      }
    } else if (swiper.isBeginning && !swiper.params.loop && params.releaseOnEdges) {
      // Return true to animate scroll on edges
      return true;
    }

return false;
  }

function handle(event) {
    let e = event;
    let disableParentSwiper = true;
    if (!swiper.enabled) return;
    const params = swiper.params.mousewheel;

if (swiper.params.cssMode) {
      e.preventDefault();
    }

let target = swiper.$el;

if (swiper.params.mousewheel.eventsTarget !== 'container') {
      target = $(swiper.params.mousewheel.eventsTarget);
    }

if (!swiper.mouseEntered && !target[0].contains(e.target) && !params.releaseOnEdges) return true;
    if (e.originalEvent) e = e.originalEvent; // jquery fix

let delta = 0;
    const rtlFactor = swiper.rtlTranslate ? -1 : 1;
    const data = normalize(e);

if (params.forceToAxis) {
      if (swiper.isHorizontal()) {
        if (Math.abs(data.pixelX) > Math.abs(data.pixelY)) delta = -data.pixelX * rtlFactor;else return true;
      } else if (Math.abs(data.pixelY) > Math.abs(data.pixelX)) delta = -data.pixelY;else return true;
    } else {
      delta = Math.abs(data.pixelX) > Math.abs(data.pixelY) ? -data.pixelX * rtlFactor : -data.pixelY;
    }

if (delta === 0) return true;
    if (params.invert) delta = -delta; // Get the scroll positions

let positions = swiper.getTranslate() + delta * params.sensitivity;
    if (positions >= swiper.minTranslate()) positions = swiper.minTranslate();
    if (positions <= swiper.maxTranslate()) positions = swiper.maxTranslate(); // When loop is true:
    //     the disableParentSwiper will be true.
    // When loop is false:
    //     if the scroll positions is not on edge,
    //     then the disableParentSwiper will be true.
    //     if the scroll on edge positions,
    //     then the disableParentSwiper will be false.

disableParentSwiper = swiper.params.loop ? true : !(positions === swiper.minTranslate() || positions === swiper.maxTranslate());
    if (disableParentSwiper && swiper.params.nested) e.stopPropagation();

if (!swiper.params.freeMode || !swiper.params.freeMode.enabled) {
      // Register the new event in a variable which stores the relevant data
      const newEvent = {
        time: now(),
        delta: Math.abs(delta),
        direction: Math.sign(delta),
        raw: event
      }; // Keep the most recent events

if (recentWheelEvents.length >= 2) {
        recentWheelEvents.shift(); // only store the last N events
      }

const prevEvent = recentWheelEvents.length ? recentWheelEvents[recentWheelEvents.length - 1] : undefined;
      recentWheelEvents.push(newEvent); // If there is at least one previous recorded event:
      //   If direction has changed or
      //   if the scroll is quicker than the previous one:
      //     Animate the slider.
      // Else (this is the first time the wheel is moved):
      //     Animate the slider.

if (prevEvent) {
        if (newEvent.direction !== prevEvent.direction || newEvent.delta > prevEvent.delta || newEvent.time > prevEvent.time + 150) {
          animateSlider(newEvent);
        }
      } else {
        animateSlider(newEvent);
      } // If it's time to release the scroll:
      //   Return now so you don't hit the preventDefault.

if (releaseScroll(newEvent)) {
        return true;
      }
    } else {
      // Freemode or scrollContainer:
      // If we recently snapped after a momentum scroll, then ignore wheel events
      // to give time for the deceleration to finish. Stop ignoring after 500 msecs
      // or if it's a new scroll (larger delta or inverse sign as last event before
      // an end-of-momentum snap).
      const newEvent = {
        time: now(),
        delta: Math.abs(delta),
        direction: Math.sign(delta)
      };
      const ignoreWheelEvents = lastEventBeforeSnap && newEvent.time < lastEventBeforeSnap.time + 500 && newEvent.delta <= lastEventBeforeSnap.delta && newEvent.direction === lastEventBeforeSnap.direction;

if (!ignoreWheelEvents) {
        lastEventBeforeSnap = undefined;

if (swiper.params.loop) {
          swiper.loopFix();
        }

let position = swiper.getTranslate() + delta * params.sensitivity;
        const wasBeginning = swiper.isBeginning;
        const wasEnd = swiper.isEnd;
        if (position >= swiper.minTranslate()) position = swiper.minTranslate();
        if (position <= swiper.maxTranslate()) position = swiper.maxTranslate();
        swiper.setTransition(0);
        swiper.setTranslate(position);
        swiper.updateProgress();
        swiper.updateActiveIndex();
        swiper.updateSlidesClasses();

if (!wasBeginning && swiper.isBeginning || !wasEnd && swiper.isEnd) {
          swiper.updateSlidesClasses();
        }

if (swiper.params.freeMode.sticky) {
          // When wheel scrolling starts with sticky (aka snap) enabled, then detect
          // the end of a momentum scroll by storing recent (N=15?) wheel events.
          // 1. do all N events have decreasing or same (absolute value) delta?
          // 2. did all N events arrive in the last M (M=500?) msecs?
          // 3. does the earliest event have an (absolute value) delta that's
          //    at least P (P=1?) larger than the most recent event's delta?
          // 4. does the latest event have a delta that's smaller than Q (Q=6?) pixels?
          // If 1-4 are "yes" then we're near the end of a momentum scroll deceleration.
          // Snap immediately and ignore remaining wheel events in this scroll.
          // See comment above for "remaining wheel events in this scroll" determination.
          // If 1-4 aren't satisfied, then wait to snap until 500ms after the last event.
          clearTimeout(timeout);
          timeout = undefined;

if (recentWheelEvents.length >= 15) {
            recentWheelEvents.shift(); // only store the last N events
          }

const prevEvent = recentWheelEvents.length ? recentWheelEvents[recentWheelEvents.length - 1] : undefined;
          const firstEvent = recentWheelEvents[0];
          recentWheelEvents.push(newEvent);

if (prevEvent && (newEvent.delta > prevEvent.delta || newEvent.direction !== prevEvent.direction)) {
            // Increasing or reverse-sign delta means the user started scrolling again. Clear the wheel event log.
            recentWheelEvents.splice(0);
          } else if (recentWheelEvents.length >= 15 && newEvent.time - firstEvent.time < 500 && firstEvent.delta - newEvent.delta >= 1 && newEvent.delta <= 6) {
            // We're at the end of the deceleration of a momentum scroll, so there's no need
            // to wait for more events. Snap ASAP on the next tick.
            // Also, because there's some remaining momentum we'll bias the snap in the
            // direction of the ongoing scroll because it's better UX for the scroll to snap
            // in the same direction as the scroll instead of reversing to snap.  Therefore,
            // if it's already scrolled more than 20% in the current direction, keep going.
            const snapToThreshold = delta > 0 ? 0.8 : 0.2;
            lastEventBeforeSnap = newEvent;
            recentWheelEvents.splice(0);
            timeout = nextTick(() => {
              swiper.slideToClosest(swiper.params.speed, true, undefined, snapToThreshold);
            }, 0); // no delay; move on next tick
          }

if (!timeout) {
            // if we get here, then we haven't detected the end of a momentum scroll, so
            // we'll consider a scroll "complete" when there haven't been any wheel events
            // for 500ms.
            timeout = nextTick(() => {
              const snapToThreshold = 0.5;
              lastEventBeforeSnap = newEvent;
              recentWheelEvents.splice(0);
              swiper.slideToClosest(swiper.params.speed, true, undefined, snapToThreshold);
            }, 500);
          }
        } // Emit event

if (!ignoreWheelEvents) emit('scroll', e); // Stop autoplay

if (swiper.params.autoplay && swiper.params.autoplayDisableOnInteraction) swiper.autoplay.stop(); // Return page scroll on edge positions

if (position === swiper.minTranslate() || position === swiper.maxTranslate()) return true;
      }
    }

if (e.preventDefault) e.preventDefault();else e.returnValue = false;
    return false;
  }

function events(method) {
    let target = swiper.$el;

if (swiper.params.mousewheel.eventsTarget !== 'container') {
      target = $(swiper.params.mousewheel.eventsTarget);
    }

target[method]('mouseenter', handleMouseEnter);
    target[method]('mouseleave', handleMouseLeave);
    target[method]('wheel', handle);
  }

function enable() {
    if (swiper.params.cssMode) {
      swiper.wrapperEl.removeEventListener('wheel', handle);
      return true;
    }

if (swiper.mousewheel.enabled) return false;
    events('on');
    swiper.mousewheel.enabled = true;
    return true;
  }

function disable() {
    if (swiper.params.cssMode) {
      swiper.wrapperEl.addEventListener(event, handle);
      return true;
    }

if (!swiper.mousewheel.enabled) return false;
    events('off');
    swiper.mousewheel.enabled = false;
    return true;
  }

on('init', () => {
    if (!swiper.params.mousewheel.enabled && swiper.params.cssMode) {
      disable();
    }

if (swiper.params.mousewheel.enabled) enable();
  });
  on('destroy', () => {
    if (swiper.params.cssMode) {
      enable();
    }

if (swiper.mousewheel.enabled) disable();
  });
  Object.assign(swiper.mousewheel, {
    enable,
    disable
  });
}

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