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import {makeAutoObservable, runInAction} from 'mobx'
import {AppBskyActorProfile as Profile} from '@atproto/api'
import shuffle from 'lodash.shuffle'
import {RootStoreModel} from './root-store'
import {cleanError} from 'lib/strings/errors'
import {bundleAsync} from 'lib/async/bundle'
import {SUGGESTED_FOLLOWS} from 'lib/constants'
const PAGE_SIZE = 30
export type SuggestedActor = Profile.ViewBasic | Profile.View
export class SuggestedActorsViewModel {
// state
pageSize = PAGE_SIZE
isLoading = false
isRefreshing = false
hasLoaded = false
error = ''
hasMore = true
loadMoreCursor?: string
private hardCodedSuggestions: SuggestedActor[] | undefined
// data
suggestions: SuggestedActor[] = []
constructor(public rootStore: RootStoreModel, opts?: {pageSize?: number}) {
if (opts?.pageSize) {
this.pageSize = opts.pageSize
}
makeAutoObservable(
this,
{
rootStore: false,
},
{autoBind: true},
)
}
get hasContent() {
return this.suggestions.length > 0
}
get hasError() {
return this.error !== ''
}
get isEmpty() {
return this.hasLoaded && !this.hasContent
}
// public api
// =
async refresh() {
return this.loadMore(true)
}
loadMore = bundleAsync(async (replace: boolean = false) => {
if (!replace && !this.hasMore) {
return
}
if (replace) {
this.hardCodedSuggestions = undefined
}
this._xLoading(replace)
try {
let items: SuggestedActor[] = this.suggestions
if (replace) {
items = []
this.loadMoreCursor = undefined
}
let res
do {
await this.fetchHardcodedSuggestions()
if (this.hardCodedSuggestions && this.hardCodedSuggestions.length > 0) {
// pull from the hard-coded suggestions
const newItems = this.hardCodedSuggestions.splice(0, this.pageSize)
items = items.concat(newItems)
this.hasMore = true
this.loadMoreCursor = undefined
} else {
// pull from the PDS' algo
res = await this.rootStore.api.app.bsky.actor.getSuggestions({
limit: this.pageSize,
cursor: this.loadMoreCursor,
})
this.loadMoreCursor = res.data.cursor
this.hasMore = !!this.loadMoreCursor
items = items.concat(
res.data.actors.filter(
actor => !items.find(i => i.did === actor.did),
),
)
}
} while (items.length < this.pageSize && this.hasMore)
runInAction(() => {
this.suggestions = items
})
this._xIdle()
} catch (e: any) {
this._xIdle(e)
}
})
private async fetchHardcodedSuggestions() {
if (this.hardCodedSuggestions) {
return
}
await this.rootStore.me.follows.fetchIfNeeded()
try {
// clone the array so we can mutate it
const actors = [
...SUGGESTED_FOLLOWS(
this.rootStore.session.currentSession?.service || '',
),
]
// fetch the profiles in chunks of 25 (the limit allowed by `getProfiles`)
let profiles: Profile.View[] = []
do {
const res = await this.rootStore.api.app.bsky.actor.getProfiles({
actors: actors.splice(0, 25),
})
profiles = profiles.concat(res.data.profiles)
} while (actors.length)
runInAction(() => {
profiles = profiles.filter(profile => {
if (this.rootStore.me.follows.isFollowing(profile.did)) {
return false
}
if (profile.did === this.rootStore.me.did) {
return false
}
return true
})
this.hardCodedSuggestions = shuffle(profiles)
})
} catch (e) {
this.rootStore.log.error(
'Failed to getProfiles() for suggested follows',
{e},
)
runInAction(() => {
this.hardCodedSuggestions = []
})
}
}
// state transitions
// =
private _xLoading(isRefreshing = false) {
this.isLoading = true
this.isRefreshing = isRefreshing
this.error = ''
}
private _xIdle(err?: any) {
this.isLoading = false
this.isRefreshing = false
this.hasLoaded = true
this.error = cleanError(err)
if (err) {
this.rootStore.log.error('Failed to fetch suggested actors', err)
}
}
}
|
