import $ from '../../../utils/dom';
import Utils from '../../../utils/utils';

export default function () {
  const swiper = this;
  const { params, $wrapperEl } = swiper;

  const slidesPerView = params.slidesPerView === 'auto' ? swiper.slidesPerViewDynamic() : params.slidesPerView;
  let slideToIndex = swiper.clickedIndex;
  let realIndex;
  if (params.loop) {
    if (swiper.animating) return;
    realIndex = parseInt($(swiper.clickedSlide).attr('data-swiper-slide-index'), 10);
    if (params.centeredSlides) {
      if (
        (slideToIndex < swiper.loopedSlides - (slidesPerView / 2))
        || (slideToIndex > (swiper.slides.length - swiper.loopedSlides) + (slidesPerView / 2))
      ) {
        swiper.loopFix();
        slideToIndex = $wrapperEl
          .children(`.${params.slideClass}[data-swiper-slide-index="${realIndex}"]:not(.${params.slideDuplicateClass})`)
          .eq(0)
          .index();

        Utils.nextTick(() => {
          swiper.slideTo(slideToIndex);
        });
      } else {
        swiper.slideTo(slideToIndex);
      }
    } else if (slideToIndex > swiper.slides.length - slidesPerView) {
      swiper.loopFix();
      slideToIndex = $wrapperEl
        .children(`.${params.slideClass}[data-swiper-slide-index="${realIndex}"]:not(.${params.slideDuplicateClass})`)
        .eq(0)
        .index();

      Utils.nextTick(() => {
        swiper.slideTo(slideToIndex);
      });
    } else {
      swiper.slideTo(slideToIndex);
    }
  } else {
    swiper.slideTo(slideToIndex);
  }
}