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import {makeAutoObservable} from 'mobx'
import {
AppBskyActorDefs,
AppBskyGraphGetFollows as GetFollows,
moderateProfile,
} from '@atproto/api'
import {RootStoreModel} from '../root-store'
const MAX_SYNC_PAGES = 10
const SYNC_TTL = 60e3 * 10 // 10 minutes
type Profile = AppBskyActorDefs.ProfileViewBasic | AppBskyActorDefs.ProfileView
export enum FollowState {
Following,
NotFollowing,
Unknown,
}
export interface FollowInfo {
did: string
followRecordUri: string | undefined
handle: string
displayName: string | undefined
avatar: string | undefined
}
/**
* This model is used to maintain a synced local cache of the user's
* follows. It should be periodically refreshed and updated any time
* the user makes a change to their follows.
*/
export class MyFollowsCache {
// data
byDid: Record<string, FollowInfo> = {}
lastSync = 0
constructor(public rootStore: RootStoreModel) {
makeAutoObservable(
this,
{
rootStore: false,
},
{autoBind: true},
)
}
// public api
// =
clear() {
this.byDid = {}
}
/**
* Syncs a subset of the user's follows
* for performance reasons, caps out at 1000 follows
*/
async syncIfNeeded() {
if (this.lastSync > Date.now() - SYNC_TTL) {
return
}
let cursor
for (let i = 0; i < MAX_SYNC_PAGES; i++) {
const res: GetFollows.Response = await this.rootStore.agent.getFollows({
actor: this.rootStore.me.did,
cursor,
limit: 100,
})
res.data.follows = res.data.follows.filter(
profile =>
!moderateProfile(profile, this.rootStore.preferences.moderationOpts)
.account.filter,
)
this.hydrateMany(res.data.follows)
if (!res.data.cursor) {
break
}
cursor = res.data.cursor
}
this.lastSync = Date.now()
}
getFollowState(did: string): FollowState {
if (typeof this.byDid[did] === 'undefined') {
return FollowState.Unknown
}
if (typeof this.byDid[did].followRecordUri === 'string') {
return FollowState.Following
}
return FollowState.NotFollowing
}
async fetchFollowState(did: string): Promise<FollowState> {
// TODO: can we get a more efficient method for this? getProfile fetches more data than we need -prf
const res = await this.rootStore.agent.getProfile({actor: did})
this.hydrate(did, res.data)
return this.getFollowState(did)
}
getFollowUri(did: string): string {
const v = this.byDid[did]
if (v && typeof v.followRecordUri === 'string') {
return v.followRecordUri
}
throw new Error('Not a followed user')
}
addFollow(did: string, info: FollowInfo) {
this.byDid[did] = info
}
removeFollow(did: string) {
if (this.byDid[did]) {
this.byDid[did].followRecordUri = undefined
}
}
hydrate(did: string, profile: Profile) {
this.byDid[did] = {
did,
followRecordUri: profile.viewer?.following,
handle: profile.handle,
displayName: profile.displayName,
avatar: profile.avatar,
}
}
hydrateMany(profiles: Profile[]) {
for (const profile of profiles) {
this.hydrate(profile.did, profile)
}
}
}
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