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import {useEffect, useMemo, useState} from 'react'
import {
AppBskyEmbedRecord,
AppBskyEmbedRecordWithMedia,
AppBskyFeedDefs,
} from '@atproto/api'
import {QueryClient} from '@tanstack/react-query'
import EventEmitter from 'eventemitter3'
import {batchedUpdates} from '#/lib/batchedUpdates'
import {findAllPostsInQueryData as findAllPostsInNotifsQueryData} from '../queries/notifications/feed'
import {findAllPostsInQueryData as findAllPostsInFeedQueryData} from '../queries/post-feed'
import {findAllPostsInQueryData as findAllPostsInQuoteQueryData} from '../queries/post-quotes'
import {findAllPostsInQueryData as findAllPostsInThreadQueryData} from '../queries/post-thread'
import {findAllPostsInQueryData as findAllPostsInSearchQueryData} from '../queries/search-posts'
import {castAsShadow, Shadow} from './types'
export type {Shadow} from './types'
export interface PostShadow {
likeUri: string | undefined
repostUri: string | undefined
isDeleted: boolean
embed: AppBskyEmbedRecord.View | AppBskyEmbedRecordWithMedia.View | undefined
pinned: boolean
}
export const POST_TOMBSTONE = Symbol('PostTombstone')
const emitter = new EventEmitter()
const shadows: WeakMap<
AppBskyFeedDefs.PostView,
Partial<PostShadow>
> = new WeakMap()
export function usePostShadow(
post: AppBskyFeedDefs.PostView,
): Shadow<AppBskyFeedDefs.PostView> | typeof POST_TOMBSTONE {
const [shadow, setShadow] = useState(() => shadows.get(post))
const [prevPost, setPrevPost] = useState(post)
if (post !== prevPost) {
setPrevPost(post)
setShadow(shadows.get(post))
}
useEffect(() => {
function onUpdate() {
setShadow(shadows.get(post))
}
emitter.addListener(post.uri, onUpdate)
return () => {
emitter.removeListener(post.uri, onUpdate)
}
}, [post, setShadow])
return useMemo(() => {
if (shadow) {
return mergeShadow(post, shadow)
} else {
return castAsShadow(post)
}
}, [post, shadow])
}
function mergeShadow(
post: AppBskyFeedDefs.PostView,
shadow: Partial<PostShadow>,
): Shadow<AppBskyFeedDefs.PostView> | typeof POST_TOMBSTONE {
if (shadow.isDeleted) {
return POST_TOMBSTONE
}
let likeCount = post.likeCount ?? 0
if ('likeUri' in shadow) {
const wasLiked = !!post.viewer?.like
const isLiked = !!shadow.likeUri
if (wasLiked && !isLiked) {
likeCount--
} else if (!wasLiked && isLiked) {
likeCount++
}
likeCount = Math.max(0, likeCount)
}
let repostCount = post.repostCount ?? 0
if ('repostUri' in shadow) {
const wasReposted = !!post.viewer?.repost
const isReposted = !!shadow.repostUri
if (wasReposted && !isReposted) {
repostCount--
} else if (!wasReposted && isReposted) {
repostCount++
}
repostCount = Math.max(0, repostCount)
}
let embed: typeof post.embed
if ('embed' in shadow) {
if (
(AppBskyEmbedRecord.isView(post.embed) &&
AppBskyEmbedRecord.isView(shadow.embed)) ||
(AppBskyEmbedRecordWithMedia.isView(post.embed) &&
AppBskyEmbedRecordWithMedia.isView(shadow.embed))
) {
embed = shadow.embed
}
}
return castAsShadow({
...post,
embed: embed || post.embed,
likeCount: likeCount,
repostCount: repostCount,
viewer: {
...(post.viewer || {}),
like: 'likeUri' in shadow ? shadow.likeUri : post.viewer?.like,
repost: 'repostUri' in shadow ? shadow.repostUri : post.viewer?.repost,
pinned: 'pinned' in shadow ? shadow.pinned : post.viewer?.pinned,
},
})
}
export function updatePostShadow(
queryClient: QueryClient,
uri: string,
value: Partial<PostShadow>,
) {
const cachedPosts = findPostsInCache(queryClient, uri)
for (let post of cachedPosts) {
shadows.set(post, {...shadows.get(post), ...value})
}
batchedUpdates(() => {
emitter.emit(uri)
})
}
function* findPostsInCache(
queryClient: QueryClient,
uri: string,
): Generator<AppBskyFeedDefs.PostView, void> {
for (let post of findAllPostsInFeedQueryData(queryClient, uri)) {
yield post
}
for (let post of findAllPostsInNotifsQueryData(queryClient, uri)) {
yield post
}
for (let node of findAllPostsInThreadQueryData(queryClient, uri)) {
if (node.type === 'post') {
yield node.post
}
}
for (let post of findAllPostsInSearchQueryData(queryClient, uri)) {
yield post
}
for (let post of findAllPostsInQuoteQueryData(queryClient, uri)) {
yield post
}
}
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