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import {AppBskyFeedDefs} from '@atproto/api'
import {FeedAPI, FeedAPIResponse} from './types'
import {FollowingFeedAPI} from './following'
import {CustomFeedAPI} from './custom'
import {PROD_DEFAULT_FEED} from '#/lib/constants'
// HACK
// the feed API does not include any facilities for passing down
// non-post elements. adding that is a bit of a heavy lift, and we
// have just one temporary usecase for it: flagging when the home feed
// falls back to discover.
// we use this fallback marker post to drive this instead. see Feed.tsx
// for the usage.
// -prf
export const FALLBACK_MARKER_POST: AppBskyFeedDefs.FeedViewPost = {
post: {
uri: 'fallback-marker-post',
cid: 'fake',
record: {},
author: {
did: 'did:fake',
handle: 'fake.com',
},
indexedAt: new Date().toISOString(),
},
}
export class HomeFeedAPI implements FeedAPI {
following: FollowingFeedAPI
discover: CustomFeedAPI
usingDiscover = false
itemCursor = 0
constructor() {
this.following = new FollowingFeedAPI()
this.discover = new CustomFeedAPI({feed: PROD_DEFAULT_FEED('whats-hot')})
}
reset() {
this.following = new FollowingFeedAPI()
this.discover = new CustomFeedAPI({feed: PROD_DEFAULT_FEED('whats-hot')})
this.usingDiscover = false
this.itemCursor = 0
}
async peekLatest(): Promise<AppBskyFeedDefs.FeedViewPost> {
if (this.usingDiscover) {
return this.discover.peekLatest()
}
return this.following.peekLatest()
}
async fetch({
cursor,
limit,
}: {
cursor: string | undefined
limit: number
}): Promise<FeedAPIResponse> {
if (!cursor) {
this.reset()
}
let returnCursor
let posts: AppBskyFeedDefs.FeedViewPost[] = []
if (!this.usingDiscover) {
const res = await this.following.fetch({cursor, limit})
returnCursor = res.cursor
posts = posts.concat(res.feed)
if (res.feed.length === 0 || !cursor) {
posts.push(FALLBACK_MARKER_POST)
this.usingDiscover = true
}
}
if (this.usingDiscover) {
const res = await this.discover.fetch({cursor, limit})
returnCursor = res.cursor
posts = posts.concat(res.feed)
}
return {
cursor: returnCursor,
feed: posts,
}
}
}
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