import { siteConfig } from '@/lib/config'
import { useGlobal } from '@/lib/global'
import { useEffect, useRef, useState } from 'react'
import BlogCard from './BlogCard'
import BlogPostListEmpty from './BlogListEmpty'

/**
 * 文章列表分页表格
 * @param page 当前页
 * @param posts 所有文章
 * @param tags 所有标签
 * @returns {JSX.Element}
 * @constructor
 */
const BlogListScroll = props => {
  const { posts = [], siteInfo } = props
  const { locale, NOTION_CONFIG } = useGlobal()
  const targetRef = useRef(null)
  const [page, updatePage] = useState(1)
  const POSTS_PER_PAGE = siteConfig('POSTS_PER_PAGE', 12, NOTION_CONFIG)

  let hasMore = false
  const postsToShow = posts
    ? Object.assign(posts).slice(0, POSTS_PER_PAGE * page)
    : []

  if (posts) {
    const totalCount = posts.length
    hasMore = page * POSTS_PER_PAGE < totalCount
  }
  const handleGetMore = () => {
    if (!hasMore) return
    updatePage(page + 1)
  }

  // 监听滚动自动分页加载
  const scrollTrigger = () => {
    requestAnimationFrame(() => {
      const scrollS = window.scrollY + window.outerHeight
      const clientHeight = targetRef
        ? targetRef.current
          ? targetRef.current.clientHeight
          : 0
        : 0
      if (scrollS > clientHeight + 100) {
        handleGetMore()
      }
    })
  }

  useEffect(() => {
    window.addEventListener('scroll', scrollTrigger)
    return () => {
      window.removeEventListener('scroll', scrollTrigger)
    }
  }, [])

  if (!posts || posts.length === 0) {
    return <BlogPostListEmpty />
  } else {
    return (
      <div id='posts-wrapper' ref={targetRef} className='grid-container'>
        {/* 文章列表 */}
        {postsToShow?.map(post => (
          <div
            key={post.id}
            className='grid-item justify-center flex'
            style={{ breakInside: 'avoid' }}>
            <BlogCard
              index={posts.indexOf(post)}
              key={post.id}
              post={post}
              siteInfo={siteInfo}
            />
          </div>
        ))}

        <div
          className='w-full my-4 py-4 text-center cursor-pointer '
          onClick={handleGetMore}>
          {' '}
          {hasMore ? locale.COMMON.MORE : `${locale.COMMON.NO_MORE} 😰`}{' '}
        </div>
      </div>
    )
  }
}

export default BlogListScroll