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import { siteConfig } from '@/lib/config'
import BlogPostCard from './BlogPostCard'
import BlogPostListEmpty from './BlogPostListEmpty'
import { useGlobal } from '@/lib/global'
import throttle from 'lodash.throttle'
import { useCallback, useEffect, useRef, useState } from 'react'
import { useRouter } from 'next/router'
/**
* 博客列表滚动分页
* @param posts 所有文章
* @param tags 所有标签
* @returns {JSX.Element}
* @constructor
*/
const BlogPostListScroll = ({ posts = [], currentSearch }) => {
const postsPerPage = parseInt(siteConfig('POSTS_PER_PAGE'))
const [page, updatePage] = useState(1)
const router = useRouter()
let filteredPosts = Object.assign(posts)
const searchKey = router?.query?.s || null
if (searchKey) {
filteredPosts = posts.filter(post => {
const tagContent = post?.tags ? post?.tags.join(' ') : ''
const searchContent = post.title + post.summary + tagContent
return searchContent.toLowerCase().includes(searchKey.toLowerCase())
})
}
const postsToShow = getPostByPage(page, filteredPosts, postsPerPage)
let hasMore = false
if (filteredPosts) {
const totalCount = filteredPosts.length
hasMore = page * postsPerPage < totalCount
}
const handleGetMore = () => {
if (!hasMore) return
updatePage(page + 1)
}
// 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))
// 监听滚动
useEffect(() => {
window.addEventListener('scroll', scrollTrigger)
return () => {
window.removeEventListener('scroll', scrollTrigger)
}
})
const targetRef = useRef(null)
const { locale } = useGlobal()
if (!postsToShow || postsToShow.length === 0) {
return <BlogPostListEmpty currentSearch={currentSearch} />
} else {
return <div id='posts-wrapper' ref={targetRef} className='w-full'>
{/* 文章列表 */}
<div className='space-y-1 lg:space-y-4'>
{postsToShow?.map(post => (
<BlogPostCard key={post.id} post={post} showSummary={true} />
))}
</div>
<div>
<div onClick={() => {
handleGetMore()
}}
className='w-full my-4 py-4 text-center cursor-pointer dark:text-gray-200'
> {hasMore ? locale.COMMON.MORE : `${locale.COMMON.NO_MORE} 😰`} </div>
</div>
</div>
}
}
/**
* 获取从第1页到指定页码的文章
* @param page 第几页
* @param totalPosts 所有文章
* @param postsPerPage 每页文章数量
* @returns {*}
*/
const getPostByPage = function (page, totalPosts, postsPerPage) {
return totalPosts.slice(
0,
postsPerPage * page
)
}
export default BlogPostListScroll
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