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import {makeAutoObservable} from 'mobx'
import {AppBskyActorGetSuggestions as GetSuggestions} from '@atproto/api'
import {RootStoreModel} from './root-store'
const PAGE_SIZE = 30
export type SuggestedActor = GetSuggestions.Actor
export class SuggestedActorsViewModel {
// state
isLoading = false
isRefreshing = false
hasLoaded = false
error = ''
hasMore = true
loadMoreCursor?: string
private _loadMorePromise: Promise<void> | undefined
// data
suggestions: SuggestedActor[] = []
constructor(public rootStore: RootStoreModel) {
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)
}
async loadMore(isRefreshing = false) {
if (this._loadMorePromise) {
return this._loadMorePromise
}
this._loadMorePromise = this._loadMore(isRefreshing)
await this._loadMorePromise
this._loadMorePromise = undefined
}
// 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 = err ? err.toString() : ''
if (err) {
this.rootStore.log.error('Failed to fetch suggested actors', err)
}
}
// loader functions
// =
private async _loadMore(isRefreshing = false) {
if (!this.hasMore) {
return
}
this._xLoading(isRefreshing)
try {
if (this.isRefreshing) {
this.suggestions = []
}
let res
let totalAdded = 0
do {
res = await this.rootStore.api.app.bsky.actor.getSuggestions({
limit: PAGE_SIZE,
cursor: this.loadMoreCursor,
})
totalAdded += await this._appendAll(res)
} while (totalAdded < PAGE_SIZE && this.hasMore)
this._xIdle()
} catch (e: any) {
this._xIdle(e)
}
}
private async _appendAll(res: GetSuggestions.Response) {
this.loadMoreCursor = res.data.cursor
this.hasMore = !!this.loadMoreCursor
const newSuggestions = res.data.actors.filter(actor => {
if (actor.did === this.rootStore.me.did) {
return false // skip self
}
if (actor.myState?.follow) {
return false // skip already-followed users
}
return true
})
this.suggestions = this.suggestions.concat(newSuggestions)
return newSuggestions.length
}
}
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