// 首页头图加载优化
/**
 * @description 实现medium的渐进加载背景的效果
 */

if (!window.ProgressiveLoad) {
  // 定义ProgressiveLoad类
  class ProgressiveLoad {
    constructor(smallSrc, largeSrc) {
      this.smallSrc = smallSrc;
      this.largeSrc = largeSrc;
      this.initScrollListener(),
      this.initTpl();
    }
    // 这里的1是滚动全程渐变 改为0.3就是前30%渐变后固定前30%产生的渐变效果
    initScrollListener() {
      window.addEventListener("scroll", (()=>{
          var e = Math.min(window.scrollY / window.innerHeight, 1);
          this.container.style.setProperty("--process", e)
      }
      ))
    }
    /**
     * @description 生成ui模板
     */
    initTpl() {
      this.container = document.createElement('div');
      this.smallStage = document.createElement('div');
      this.largeStage = document.createElement('div');
      this.video = document.createElement('div');
      this.smallImg = new Image();
      this.largeImg = new Image();
      this.container.className = 'pl-container';
      this.container.style.setProperty("--process", 0),
      this.smallStage.className = 'pl-img pl-blur';
      this.largeStage.className = 'pl-img';
      this.video.className = 'pl-video';
      this.container.appendChild(this.smallStage);
      this.container.appendChild(this.largeStage);
      this.container.appendChild(this.video);
      this.smallImg.onload = this._onSmallLoaded.bind(this);
      this.largeImg.onload = this._onLargeLoaded.bind(this);
    }

    /**
     * @description 加载背景
     */
    progressiveLoad() {
      this.smallImg.src = this.smallSrc;
      this.largeImg.src = this.largeSrc;
    }
    /**
     * @description 大图加载完成
     */
    _onLargeLoaded() {
      this.largeStage.classList.add('pl-visible');
      this.largeStage.style.backgroundImage = `url('${this.largeSrc}')`;
    }

    /**
     * @description 小图加载完成
     */
    _onSmallLoaded() {
      this.smallStage.classList.add('pl-visible');
      this.smallStage.style.backgroundImage = `url('${this.smallSrc}')`;
    }
  }

  const executeLoad = (config, target) => {
    console.log('执行渐进背景替换');
    const isMobile = window.matchMedia('(max-width: 767px)').matches;
    const loader = new ProgressiveLoad(
      isMobile ? config.mobileSmallSrc : config.smallSrc,
      isMobile ? config.mobileLargeSrc : config.largeSrc
    );
    // 和背景图颜色保持一致，防止高斯模糊后差异较大
    if (target.children[0]) {
      target.insertBefore(loader.container, target.children[0]);
    }
    loader.progressiveLoad();
  };

  const config = {
    smallSrc: 'https://t.mwm.moe/moez', // 小图链接 尽可能配置小于100k的图片
    largeSrc: 'https://t.mwm.moe/moez', // 大图链接 最终显示的图片
    mobileSmallSrc: 'https://t.mwm.moe/moez', // 手机端小图链接 尽可能配置小于100k的图片
    mobileLargeSrc: 'https://t.mwm.moe/moez', // 手机端大图链接 最终显示的图片
    enableRoutes: ['/'],
    };

  function initProgressiveLoad(config) {
    // 每次加载前先清除已有的元素
    const container = document.querySelector('.pl-container'); 
    if (container) {
      container.remove(); 
    }
    const target = document.getElementById('page-header');
    if (target && target.classList.contains('full_page')) {
      executeLoad(config, target);
    }
  }

  function onPJAXComplete(config) {
    const target = document.getElementById('page-header');
    if (target && target.classList.contains('full_page')) {
      initProgressiveLoad(config);
    }
  }

  document.addEventListener("DOMContentLoaded", function() {
    initProgressiveLoad(config);
  });

  document.addEventListener("pjax:complete", function() {
    onPJAXComplete(config);
  });

}

/* 首页头图加载 */
body[data-type=anzhiyu] #nav,
body[data-type=anzhiyu] #scroll-down,
body[data-type=anzhiyu] #site-info {
  -webkit-animation: scale 2.2s cubic-bezier(.6, .1, .25, 1) .5s 1 backwards;
  animation: scale 2.2s cubic-bezier(.6, .1, .25, 1) .5s 1 backwards
}

@media screen and (max-width: 768px) {
  .pl-container {
    position: relative !important
  }
}

@media screen and (min-width: 768px) {

  #page-header.full_page,
  .pl-container {
    height: 100vh
  }

  #page-header.full_page.expand-to-full,
  .pl-container.expand-to-full {
    height: 50vh !important
  }

  .pl-container {
    will-change: opacity, transform, filter;
    opacity: calc(1 - var(--process) * 1) !important;
    transform: scale(calc(1 + var(--process) * .1));
    filter: blur(calc(var(--process) * 10px));
  }
}

.pl-container {
  width: 100%;
  height: 100%;
  position: fixed;
  z-index: -2;
  overflow: hidden;
  will-change: transform;
  /* 添加性能优化 */
  animation: blur-to-clear 2.5s cubic-bezier(.6, .25, .25, 1) 0s 1 backwards, scale 2.2s cubic-bezier(.6, .1, .25, 1) .5s 1 backwards;
}

.pl-img {
  width: 100%;
  height: 100%;
  position: absolute;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: .1;
  transition: opacity 1s;
  will-change: transform, opacity
}

.pl-video.pl-visible {
  display: block
}

@keyframes blur-to-clear {
  0% {
    filter: blur(50px);
    opacity: 1;
  }

  100% {
    filter: blur(0);
    opacity: 1;
  }
}

@keyframes scale {
  0% {
    transform: scale(1.5) translateZ(0);
    opacity: 0;
  }

  to {
    transform: scale(1) translateZ(0);
    opacity: 1;
  }
}

.pl-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAKUlEQVQImU3IMREAIAgAwJfNkQCEsH8cijjpMf6vnXlQaIiJFx+omEBfmqIEZLe2jzcAAAAASUVORK5CYII=);
}

.pl-visible {
  opacity: 1;
}

.pl-blur {
  /* 小图锯齿多，增加高斯模糊 */
  filter: blur(50px);
}

/* 去除首页图片背景黑板 */
[data-theme='dark'] #web_bg:before, [data-theme='dark'] #footer:before, [data-theme='dark'] #page-header:before{
  background-color: transparent;
}

/* 默认背景 */
[data-theme=light] #body-wrap {
    background: linear-gradient(0deg, rgba(247, 149, 51, .1), rgba(243, 112, 85, .1) 15%, rgba(239, 78, 123, .1) 30%, rgba(161, 102, 171, .1) 44%, rgba(80, 115, 184, .1) 58%, rgba(16, 152, 173, .1) 72%, rgba(7, 179, 155, .1) 86%, rgba(109, 186, 130, .1)) !important;
  }

[data-theme=light] #body-wrap {
    background-image: url(https://bu.dusays.com/2023/10/28/653ce9975bdfe.webp);
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
  }
  /* 黑夜背景 */
  [data-theme=dark] #body-wrap {
    background-image: url(https://bu.dusays.com/2023/10/28/653ce9975bdfe.webp);
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
  }

div#bg-video
  video(autoplay muted loop)
    source(src= url_for('视频url') type='video/mp4')

[data-theme=light] #bg-video {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
  }
[data-theme=dark] #bg-video {
    display: none;
  }
  #bg-video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }