/**
 * loading 占位
 * 解决首次加载时白屏的问题
 */
(function () {
  const _app = document.querySelector('#app');
  if (_app && _app.innerHTML === '') {
    const styleStr = `
    <style>
      html,
      body,
      #app {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #app {
        background-repeat: no-repeat;
        background-size: 100% auto;
      }
      .loading-title {
        font-size: 1.1rem;
      }
      .loading-sub-title {
        text-align: center;
        margin-top: 20px;
        font-size: 1rem;
        color: #888;
      }
      .page-loading-warp {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 26px;
      }
      .ant-spin {
        position: absolute;
        display: none;
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
        margin: 0;
        padding: 0;
        color: rgba(0, 0, 0, 0.65);
        color: #1890ff;
        font-size: 14px;
        font-variant: tabular-nums;
        line-height: 1.5;
        text-align: center;
        list-style: none;
        opacity: 0;
        -webkit-transition: -webkit-transform 0.3s
          cubic-bezier(0.78, 0.14, 0.15, 0.86);
        transition: -webkit-transform 0.3s
          cubic-bezier(0.78, 0.14, 0.15, 0.86);
        transition: transform 0.3s cubic-bezier(0.78, 0.14, 0.15, 0.86);
        transition: transform 0.3s cubic-bezier(0.78, 0.14, 0.15, 0.86),
          -webkit-transform 0.3s cubic-bezier(0.78, 0.14, 0.15, 0.86);
        -webkit-font-feature-settings: "tnum";
        font-feature-settings: "tnum";
      }
      .ant-spin-spinning {
        position: static;
        display: inline-block;
        opacity: 1;
      }
      .ant-spin-dot {
        position: relative;
        display: inline-block;
        width: 20px;
        height: 20px;
        font-size: 20px;
      }
      .ant-spin-dot-item {
        position: absolute;
        display: block;
        width: 9px;
        height: 9px;
        background-color: #1890ff;
        border-radius: 100%;
        -webkit-transform: scale(0.75);
        -ms-transform: scale(0.75);
        transform: scale(0.75);
        -webkit-transform-origin: 50% 50%;
        -ms-transform-origin: 50% 50%;
        transform-origin: 50% 50%;
        opacity: 0.3;
        -webkit-animation: antspinmove 1s infinite linear alternate;
        animation: antSpinMove 1s infinite linear alternate;
      }
      .ant-spin-dot-item:nth-child(1) {
        top: 0;
        left: 0;
      }
      .ant-spin-dot-item:nth-child(2) {
        top: 0;
        right: 0;
        -webkit-animation-delay: 0.4s;
        animation-delay: 0.4s;
      }
      .ant-spin-dot-item:nth-child(3) {
        right: 0;
        bottom: 0;
        -webkit-animation-delay: 0.8s;
        animation-delay: 0.8s;
      }
      .ant-spin-dot-item:nth-child(4) {
        bottom: 0;
        left: 0;
        -webkit-animation-delay: 1.2s;
        animation-delay: 1.2s;
      }
      .ant-spin-dot-spin {
        -webkit-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
        transform: rotate(45deg);
        -webkit-animation: antrotate 1.2s infinite linear;
        animation: antRotate 1.2s infinite linear;
      }
      .ant-spin-lg .ant-spin-dot {
        width: 32px;
        height: 32px;
        font-size: 32px;
      }
      .ant-spin-lg .ant-spin-dot i {
        width: 14px;
        height: 14px;
      }
      @media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
        .ant-spin-blur {
          background: #fff;
          opacity: 0.5;
        }
      }
      @-webkit-keyframes antSpinMove {
        to {
          opacity: 1;
        }
      }
      @keyframes antSpinMove {
        to {
          opacity: 1;
        }
      }
      @-webkit-keyframes antRotate {
        to {
          -webkit-transform: rotate(405deg);
          transform: rotate(405deg);
        }
      }
      @keyframes antRotate {
        to {
          -webkit-transform: rotate(405deg);
          transform: rotate(405deg);
        }
      }
    </style>`;

    const lang = localStorage.getItem('cache:local:i18n') || 'en_US';
    // 根据浏览器选择语言
    // if (!lang) {
    //   let preferredLanguage = navigator.language;
    //   if (preferredLanguage.indexOf('-')) {
    //     preferredLanguage = preferredLanguage.replace('-', '_');
    //   }
    //   localStorage.setItem('cache:local:i18n', preferredLanguage);
    // }

    let loadInfo = {
      title: '正在加载资源',
      titleSub: '初次加载资源可能需要较多时间',
      msg: '请耐心等待',
    };
    // document.title = "AGrandEMS";

    if (lang === 'en_US') {
      loadInfo = {
        title: 'Loading Resources',
        titleSub: 'Loading resources for the first time may take a lot of time',
        msg: 'Please be patient',
      };
      // document.title = "AGrandEMS";
    }

    const divStr = `
    <div style="
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100%;
      min-height: 362px;
    ">
      <div class="page-loading-warp">
        <div class="ant-spin ant-spin-lg ant-spin-spinning">
          <span class="ant-spin-dot ant-spin-dot-spin">
            <i class="ant-spin-dot-item"></i>
            <i class="ant-spin-dot-item"></i>
            <i class="ant-spin-dot-item"></i>
            <i class="ant-spin-dot-item"></i>
          </span>
        </div>
      </div>
      <div class="loading-title">
        ${loadInfo.title}
      </div>
      <div class="loading-sub-title">
        ${loadInfo.titleSub} </br> ${loadInfo.msg}
      </div>
    </div>`;

    _app.innerHTML = styleStr + divStr;
  }
})();