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import {AppBskyFeedFeedViewPost} from '@atproto/api'
type FeedViewPost = AppBskyFeedFeedViewPost.Main
export type FeedTunerFn = (
tuner: FeedTuner,
slices: FeedViewPostsSlice[],
) => void
export class FeedViewPostsSlice {
constructor(public items: FeedViewPost[] = []) {}
get uri() {
if (this.isReply) {
return this.items[1].post.uri
}
return this.items[0].post.uri
}
get ts() {
if (this.items[0].reason?.indexedAt) {
return this.items[0].reason.indexedAt as string
}
return this.items[0].post.indexedAt
}
get isThread() {
return (
this.items.length > 1 &&
this.items.every(
item => item.post.author.did === this.items[0].post.author.did,
)
)
}
get isReply() {
return this.items.length === 2 && !this.isThread
}
get rootItem() {
if (this.isReply) {
return this.items[1]
}
return this.items[0]
}
containsUri(uri: string) {
return !!this.items.find(item => item.post.uri === uri)
}
insert(item: FeedViewPost) {
const selfReplyUri = getSelfReplyUri(item)
const i = this.items.findIndex(item2 => item2.post.uri === selfReplyUri)
if (i !== -1) {
this.items.splice(i + 1, 0, item)
} else {
this.items.push(item)
}
}
flattenReplyParent() {
if (this.items[0].reply?.parent) {
this.items.splice(0, 0, {post: this.items[0].reply?.parent})
}
}
logSelf() {
console.log(
`- Slice ${this.items.length}${this.isThread ? ' (thread)' : ''} -`,
)
for (const item of this.items) {
console.log(
` ${item.reason ? `RP by ${item.reason.by.handle}: ` : ''}${
item.post.author.handle
}: ${item.reply ? `(Reply ${item.reply.parent.author.handle}) ` : ''}${
item.post.record.text
}`,
)
}
}
}
export class FeedTuner {
seenUris: Set<string> = new Set()
constructor() {}
reset() {
this.seenUris.clear()
}
tune(
feed: FeedViewPost[],
tunerFns: FeedTunerFn[] = [],
): FeedViewPostsSlice[] {
const slices: FeedViewPostsSlice[] = []
// arrange the posts into thread slices
for (let i = feed.length - 1; i >= 0; i--) {
const item = feed[i]
const selfReplyUri = getSelfReplyUri(item)
if (selfReplyUri) {
const parent = slices.find(item2 => item2.containsUri(selfReplyUri))
if (parent) {
parent.insert(item)
continue
}
}
slices.unshift(new FeedViewPostsSlice([item]))
}
// remove any items already "seen"
for (let i = slices.length - 1; i >= 0; i--) {
if (this.seenUris.has(slices[i].uri)) {
slices.splice(i, 1)
}
}
// turn non-threads with reply parents into threads
for (const slice of slices) {
if (
!slice.isThread &&
!slice.items[0].reason &&
slice.items[0].reply?.parent &&
!this.seenUris.has(slice.items[0].reply?.parent.uri)
) {
slice.flattenReplyParent()
}
}
// sort by slice roots' timestamps
slices.sort((a, b) => b.ts.localeCompare(a.ts))
// run the custom tuners
for (const tunerFn of tunerFns) {
tunerFn(this, slices)
}
for (const slice of slices) {
for (const item of slice.items) {
this.seenUris.add(item.post.uri)
}
slice.logSelf()
}
return slices
}
static dedupReposts(tuner: FeedTuner, slices: FeedViewPostsSlice[]) {
// remove duplicates caused by reposts
for (let i = 0; i < slices.length; i++) {
const item1 = slices[i]
for (let j = i + 1; j < slices.length; j++) {
const item2 = slices[j]
if (item2.isThread) {
// dont dedup items that are rendering in a thread as this can cause rendering errors
continue
}
if (item1.containsUri(item2.items[0].post.uri)) {
slices.splice(j, 1)
j--
}
}
}
}
static likedRepliesOnly(tuner: FeedTuner, slices: FeedViewPostsSlice[]) {
// remove any replies without any likes
for (let i = slices.length - 1; i >= 0; i--) {
if (slices[i].isThread) {
continue
}
const item = slices[i].rootItem
const isRepost = Boolean(item.reason)
if (item.reply && !isRepost && item.post.upvoteCount === 0) {
slices.splice(i, 1)
}
}
}
}
function getSelfReplyUri(item: FeedViewPost): string | undefined {
return item.reply?.parent.author.did === item.post.author.did
? item.reply?.parent.uri
: undefined
}
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