$(function () {
  // var images = $('.lazyload')
  // function callback(entries) {
  //   for (let i of entries) {
  //     if (i.isIntersecting) {
  //       let img = i.target
  //       let trueSrc = img.getAttribute('data-src')
  //       img.setAttribute('src', trueSrc)
  //       img.addEventListener('load', function () {
  //         setTimeout(function () {
  //           img.classList.remove('lazyload')
  //         }, 1200)
  //       })
  //       observer.unobserve(img)
  //     }
  //   }
  // }
  // const observer = new IntersectionObserver(callback)
  // for (let i of images) {
  //   observer.observe(i)
  // }

  // kv
  var mySwiper = new Swiper('.ias-car-kvbanner', {
    // direction: "vertical",
    loop: true,
    pagination: {
      el: '.swiper-pagination-kv',
      clickable: true,
    },
    navigation: {
      nextEl: '.swiper-button-next-kv',
      prevEl: '.swiper-button-prev-kv',
    },
    slidesPerView: 1,
    speed: 500,
    loop: true,
    autoplay: false,
    spaceBetween: 0,
    keyboard: true,
    observer: true,
    observeParents: true,
    on: {
      transitionStart: function (mySwiper) {
        $('.ias-car-kvbanner').find('img').trigger('appear')
      },
    },
  })

  // WebP支持检测（首次运行时缓存结果）
  function checkWebPSupport(callback) {
    if (typeof localStorage !== 'undefined' && localStorage.getItem('webpSupport') !== null) {
      return callback(localStorage.getItem('webpSupport') === 'true')
    }

    const img = new Image()
    img.onload = function () {
      const result = img.width > 0 && img.height > 0
      localStorage.setItem('webpSupport', result)
      callback(result)
    }
    img.onerror = function () {
      localStorage.setItem('webpSupport', false)
      callback(false)
    }

    img.src =
      'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII='
  }
  checkWebPSupport(function (isSupported) {
    $('img').each(function () {
      const $img = $(this)
      const webpSrc = $img.closest('picture').find('source[type="image/webp"]').data('srcset')
      const fallbackSrc = $img.data('src')

      // 动态设置真实图片路径
      $img.data('original', isSupported ? webpSrc : fallbackSrc)
    })

    $('img').lazyload({
      threshold: 200,
      effect: 'fadeIn',
      appear: function () {
        const realSrc = $(this).data('original')
        $(this).attr('src', realSrc)
        $(this).addClass('lazy-loaded')
      },
      load: function () {
        $(this).addClass('lazy-loaded')
      },
      error: function () {
        $(this).attr('src', 'img/error.jpg')
      },
    })
  })

  // 初始化懒加载
  $('img').lazyload({
    effect: 'fadeIn', // 淡入效果
    threshold: 100, // 提前300px加载
    failure_limit: 15, // 最大容错数量
    skip_invisible: true, // 加载隐藏图片
    appear: function () {
      // 加载前回调
      $(this).css('background', 'transparent')
      $(this).removeClass('lazyload')
    },
    load: function () {
      // 加载完成回调
      $(this).addClass('lazy-loaded')
    },
  })

  // 头部导航交互
  // if (screenwidth > 900) {
  //   var lastScrollTop = 0
  //   $(window).scroll(function () {
  //     var currentScrollTop = $(this).scrollTop()

  //     if (currentScrollTop > lastScrollTop) {
  //       // 向下滚动时执行的操作
  //       // $('.ias-tpl-header').hide()
  //       if (currentScrollTop >= 0) {
  //         $('.cars-filternav-con,.ias-tpl-header').addClass('active')
  //       }
  //       $('.cars-filternav-hd h2').removeClass('active')
  //       $('.filter-section-con').slideUp(500)
  //     } else if (currentScrollTop < lastScrollTop) {
  //       // 向上滚动时执行的操作
  //       if (currentScrollTop <= 0) {
  //         $('.cars-filternav-con,.ias-tpl-header').removeClass('active')
  //       }
  //       $('.cars-filternav-hd h2').removeClass('active')
  //       $('.filter-section-con').slideUp(500)
  //     }

  //     lastScrollTop = currentScrollTop
  //   })
  // }
})