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