const thumbClass = 'thumblist-item';
const mytap = window.ontouchstart === null?"touchstart":"click";

const mySwiper = new Swiper('.swiper-container', {
  speed: 1500,
  autoplay:{
    delay:2000
  },
  pagination:{
    el:'.thumblist',
    type:'custom',
    renderCustom: function (swiper, current, total) {
      const slides = swiper.slides;
      let html = '';
      for( let i = 0 ; i < total; i++ ){
        if( current == i+1 ){
          html = html + `<div class="${thumbClass} current" data-slideto="${i}">${slides[i].innerHTML}</div>`;
        }else{
          html = html + `<div class="${thumbClass}" data-slideto="${i}">${slides[i].innerHTML}</div>`;
        }
      }
      return html;
    }
  }
});

const clickThumbs = (()=>{
  const thumbItems = document.getElementsByClassName(thumbClass);
  for(let i = 0; i < thumbItems.length ; i ++){
    thumbItems[i].addEventListener(mytap,((e)=>{
      let index = e.currentTarget.dataset.slideto;
      mySwiper.slideTo(index, 1500, true);
      // autoplayオプションを使わない場合は、以下をコメントアウトをする
      setTimeout(mySwiper.autoplay.start,3000);
    }),false);
  }
});

clickThumbs();
mySwiper.on('slideChange',clickThumbs);