import { useGlobal } from '@/lib/global'
import { useEffect, useState } from 'react'
/**
 * @see https://css-loaders.com/
 * @returns 加载动画
 */
export default function LoadingCover() {
  const { onLoading, setOnLoading } = useGlobal()
  const [isVisible, setIsVisible] = useState(false) // 初始状态设置为false，避免服务端渲染与客户端渲染不一致

  useEffect(() => {
    // 确保在客户端渲染时才设置可见性
    if (onLoading) {
      setIsVisible(true)
    } else {
      const timeout = setTimeout(() => setIsVisible(false), 1800) // 等待淡出动画结束
      return () => clearTimeout(timeout)
    }
  }, [onLoading])

  const handleClick = () => {
    setOnLoading(false) // 强行关闭 LoadingCover
  }

  if (typeof window === 'undefined') {
    return null // 避免在服务端渲染时渲染出这个组件
  }

  return isVisible ? (
    <div
      id='loading-cover'
      onClick={handleClick}
      className={`dark:text-white text-black bg-white dark:bg-black animate__animated animate__faster ${
        onLoading ? 'animate__fadeIn' : 'animate__fadeOut'
      } flex flex-col justify-center z-50 w-full h-screen fixed top-0 left-0`}>
      <div className='mx-auto'>
        <style global>
          {`
          .loader {
            width: 20px;
            aspect-ratio: 1;
            border-radius: 50%;
            background: #000;
            box-shadow: 0 0 0 0 #0004;
            animation: l2 1.5s infinite linear;
            position: relative;
          }
          .loader:before,
          .loader:after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: inherit;
            box-shadow: 0 0 0 0 #0004;
            animation: inherit;
            animation-delay: -0.5s;
          }
          .loader:after {
            animation-delay: -1s;
          }
            /* 深色模式下的样式 */
          .dark .loader {
            background: #fff; /* 白色或灰色 */
            box-shadow: 0 0 0 0 #fff4; /* 使用白色阴影 */
          }
          @keyframes l2 {
            100% {
              box-shadow: 0 0 0 40px #0000;
            }
          }
      `}
        </style>
        <div className='loader'></div>
      </div>
    </div>
  ) : null
}