import { siteConfig } from '@/lib/config'
import { useGlobal } from '@/lib/global'
import { useCallback, useEffect, useRef, useState } from 'react'
import throttle from 'lodash.throttle'
import BlogPostCard from './BlogPostCard'
import CONFIG from '../config'

export const BlogListScroll = props => {
  const { posts } = props
  const { locale } = useGlobal()

  const [page, updatePage] = useState(1)

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

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

  const targetRef = useRef(null)

  // 监听滚动自动分页加载
  const scrollTrigger = useCallback(throttle(() => {
    const scrollS = window.scrollY + window.outerHeight
    const clientHeight = targetRef ? (targetRef.current ? (targetRef.current.clientHeight) : 0) : 0
    if (scrollS > clientHeight + 100) {
      handleGetMore()
    }
  }, 500))
  const showPageCover = siteConfig('EXAMPLE_POST_LIST_COVER', null, CONFIG)

  useEffect(() => {
    window.addEventListener('scroll', scrollTrigger)

    return () => {
      window.removeEventListener('scroll', scrollTrigger)
    }
  })

  return (

        <div id='posts-wrapper' className={`w-full ${showPageCover ? 'md:pr-2' : 'md:pr-12'}} mb-12`} ref={targetRef}>

            {postsToShow?.map(post => (
                <BlogPostCard key={post.id} post={post} />
            ))}

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

        </div>
  )
}