text: import Utils from '../../../utils/utils';
  
  export default function (event) {
    const swiper = this;
    const data = swiper.touchEventsData;
  
    const {
      params, touches, rtlTranslate: rtl, $wrapperEl, slidesGrid, snapGrid,
    } = swiper;
    let e = event;
    if (e.originalEvent) e = e.originalEvent;
    if (data.allowTouchCallbacks) {
      swiper.emit('touchEnd', e);
    }
    data.allowTouchCallbacks = false;
    if (!data.isTouched) {
      if (data.isMoved && params.grabCursor) {
        swiper.setGrabCursor(false);
      }
      data.isMoved = false;
      data.startMoving = false;
      return;
    }
    // Return Grab Cursor
    if (params.grabCursor && data.isMoved && data.isTouched && (swiper.allowSlideNext === true || swiper.allowSlidePrev === true)) {
      swiper.setGrabCursor(false);
    }
  
    // Time diff
    const touchEndTime = Utils.now();
    const timeDiff = touchEndTime - data.touchStartTime;
  
    // Tap, doubleTap, Click
    if (swiper.allowClick) {
      swiper.updateClickedSlide(e);
      swiper.emit('tap', e);
      if (timeDiff < 300 && (touchEndTime - data.lastClickTime) > 300) {
        if (data.clickTimeout) clearTimeout(data.clickTimeout);
        data.clickTimeout = Utils.nextTick(() => {
          if (!swiper || swiper.destroyed) return;
          swiper.emit('click', e);
        }, 300);
      }
      if (timeDiff < 300 && (touchEndTime - data.lastClickTime) < 300) {
        if (data.clickTimeout) clearTimeout(data.clickTimeout);
        swiper.emit('doubleTap', e);
      }
    }
  
    data.lastClickTime = Utils.now();
    Utils.nextTick(() => {
      if (!swiper.destroyed) swiper.allowClick = true;
    });
  
    if (!data.isTouched || !data.isMoved || !swiper.swipeDirection || touches.diff === 0 || data.currentTranslate === data.startTranslate) {
      data.isTouched = false;
      data.isMoved = false;
      data.startMoving = false;
      return;
    }
    data.isTouched = false;
    data.isMoved = false;
    data.startMoving = false;
  
    let currentPos;
    if (params.followFinger) {
      currentPos = rtl ? swiper.translate : -swiper.translate;
    } else {
      currentPos = -data.currentTranslate;
    }
  
    if (params.freeMode) {
      if (currentPos < -swiper.minTranslate()) {
        swiper.slideTo(swiper.activeIndex);
        return;
      }
      if (currentPos > -swiper.maxTranslate()) {
        if (swiper.slides.length < snapGrid.length) {
          swiper.slideTo(snapGrid.length - 1);
        } else {
          swiper.slideTo(swiper.slides.length - 1);
        }
        return;
      }
  
      if (params.freeModeMomentum) {
        if (data.velocities.length > 1) {
          const lastMoveEvent = data.velocities.pop();
          const velocityEvent = data.velocities.pop();
  
          const distance = lastMoveEvent.position - velocityEvent.position;
          const time = lastMoveEvent.time - velocityEvent.time;
          swiper.velocity = distance / time;
          swiper.velocity /= 2;
          if (Math.abs(swiper.velocity) < params.freeModeMinimumVelocity) {
            swiper.velocity = 0;
          }
          // this implies that the user stopped moving a finger then released.
          // There would be no events with distance zero, so the last event is stale.
          if (time > 150 || (Utils.now() - lastMoveEvent.time) > 300) {
            swiper.velocity = 0;
          }
        } else {
          swiper.velocity = 0;
        }
        swiper.velocity *= params.freeModeMomentumVelocityRatio;
  
        data.velocities.length = 0;
        let momentumDuration = 1000 * params.freeModeMomentumRatio;
        const momentumDistance = swiper.velocity * momentumDuration;
  
        let newPosition = swiper.translate + momentumDistance;
        if (rtl) newPosition = -newPosition;
  
        let doBounce = false;
        let afterBouncePosition;
        const bounceAmount = Math.abs(swiper.velocity) * 20 * params.freeModeMomentumBounceRatio;
        let needsLoopFix;
        if (newPosition < swiper.maxTranslate()) {
          if (params.freeModeMomentumBounce) {
            if (newPosition + swiper.maxTranslate() < -bounceAmount) {
              newPosition = swiper.maxTranslate() - bounceAmount;
            }
            afterBouncePosition = swiper.maxTranslate();
            doBounce = true;
            data.allowMomentumBounce = true;
          } else {
            newPosition = swiper.maxTranslate();
          }
          if (params.loop && params.centeredSlides) needsLoopFix = true;
        } else if (newPosition > swiper.minTranslate()) {
          if (params.freeModeMomentumBounce) {
            if (newPosition - swiper.minTranslate() > bounceAmount) {
              newPosition = swiper.minTranslate() + bounceAmount;
            }
            afterBouncePosition = swiper.minTranslate();
            doBounce = true;
            data.allowMomentumBounce = true;
          } else {
            newPosition = swiper.minTranslate();
          }
          if (params.loop && params.centeredSlides) needsLoopFix = true;
        } else if (params.freeModeSticky) {
          let nextSlide;
          for (let j = 0; j < snapGrid.length; j += 1) {
            if (snapGrid[j] > -newPosition) {
              nextSlide = j;
              break;
            }
          }
  
          if (Math.abs(snapGrid[nextSlide] - newPosition) < Math.abs(snapGrid[nextSlide - 1] - newPosition) || swiper.swipeDirection === 'next') {
            newPosition = snapGrid[nextSlide];
          } else {
            newPosition = snapGrid[nextSlide - 1];
          }
          newPosition = -newPosition;
        }
        if (needsLoopFix) {
          swiper.once('transitionEnd', () => {
            swiper.loopFix();
          });
        }
        // Fix duration
        if (swiper.velocity !== 0) {
          if (rtl) {
            momentumDuration = Math.abs((-newPosition - swiper.translate) / swiper.velocity);
          } else {
            momentumDuration = Math.abs((newPosition - swiper.translate) / swiper.velocity);
          }
        } else if (params.freeModeSticky) {
          swiper.slideToClosest();
          return;
        }
  
        if (params.freeModeMomentumBounce && doBounce) {
          swiper.updateProgress(afterBouncePosition);
          swiper.setTransition(momentumDuration);
          swiper.setTranslate(newPosition);
          swiper.transitionStart(true, swiper.swipeDirection);
          swiper.animating = true;
          $wrapperEl.transitionEnd(() => {
            if (!swiper || swiper.destroyed || !data.allowMomentumBounce) return;
            swiper.emit('momentumBounce');
  
            swiper.setTransition(params.speed);
            swiper.setTranslate(afterBouncePosition);
            $wrapperEl.transitionEnd(() => {
              if (!swiper || swiper.destroyed) return;
              swiper.transitionEnd();
            });
          });
        } else if (swiper.velocity) {
          swiper.updateProgress(newPosition);
          swiper.setTransition(momentumDuration);
          swiper.setTranslate(newPosition);
          swiper.transitionStart(true, swiper.swipeDirection);
          if (!swiper.animating) {
            swiper.animating = true;
            $wrapperEl.transitionEnd(() => {
              if (!swiper || swiper.destroyed) return;
              swiper.transitionEnd();
            });
          }
        } else {
          swiper.updateProgress(newPosition);
        }
  
        swiper.updateActiveIndex();
        swiper.updateSlidesClasses();
      } else if (params.freeModeSticky) {
        swiper.slideToClosest();
        return;
      }
  
      if (!params.freeModeMomentum || timeDiff >= params.longSwipesMs) {
        swiper.updateProgress();
        swiper.updateActiveIndex();
        swiper.updateSlidesClasses();
      }
      return;
    }
  
    // Find current slide
    let stopIndex = 0;
    let groupSize = swiper.slidesSizesGrid[0];
    for (let i = 0; i < slidesGrid.length; i += params.slidesPerGroup) {
      if (typeof slidesGrid[i + params.slidesPerGroup] !== 'undefined') {
        if (currentPos >= slidesGrid[i] && currentPos < slidesGrid[i + params.slidesPerGroup]) {
          stopIndex = i;
          groupSize = slidesGrid[i + params.slidesPerGroup] - slidesGrid[i];
        }
      } else if (currentPos >= slidesGrid[i]) {
        stopIndex = i;
        groupSize = slidesGrid[slidesGrid.length - 1] - slidesGrid[slidesGrid.length - 2];
      }
    }
  
    // Find current slide size
    const ratio = (currentPos - slidesGrid[stopIndex]) / groupSize;
  
    if (timeDiff > params.longSwipesMs) {
      // Long touches
      if (!params.longSwipes) {
        swiper.slideTo(swiper.activeIndex);
        return;
      }
      if (swiper.swipeDirection === 'next') {
        if (ratio >= params.longSwipesRatio) swiper.slideTo(stopIndex + params.slidesPerGroup);
        else swiper.slideTo(stopIndex);
      }
      if (swiper.swipeDirection === 'prev') {
        if (ratio > (1 - params.longSwipesRatio)) swiper.slideTo(stopIndex + params.slidesPerGroup);
        else swiper.slideTo(stopIndex);
      }
    } else {
      // Short swipes
      if (!params.shortSwipes) {
        swiper.slideTo(swiper.activeIndex);
        return;
      }
      if (swiper.swipeDirection === 'next') {
        swiper.slideTo(stopIndex + params.slidesPerGroup);
      }
      if (swiper.swipeDirection === 'prev') {
        swiper.slideTo(stopIndex);
      }
    }
  }
  