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import {useEffect, useState, useMemo, useCallback, useRef} from 'react'
import EventEmitter from 'eventemitter3'
import {AppBskyActorDefs} from '@atproto/api'
import {Shadow} from './types'
export type {Shadow} from './types'
const emitter = new EventEmitter()
export interface ProfileShadow {
followingUri: string | undefined
muted: boolean | undefined
blockingUri: string | undefined
}
interface CacheEntry {
ts: number
value: ProfileShadow
}
type ProfileView =
| AppBskyActorDefs.ProfileView
| AppBskyActorDefs.ProfileViewBasic
| AppBskyActorDefs.ProfileViewDetailed
export function useProfileShadow(
profile: ProfileView,
ifAfterTS: number,
): Shadow<ProfileView> {
const [state, setState] = useState<CacheEntry>({
ts: Date.now(),
value: fromProfile(profile),
})
const firstRun = useRef(true)
const onUpdate = useCallback(
(value: Partial<ProfileShadow>) => {
setState(s => ({ts: Date.now(), value: {...s.value, ...value}}))
},
[setState],
)
// react to shadow updates
useEffect(() => {
emitter.addListener(profile.did, onUpdate)
return () => {
emitter.removeListener(profile.did, onUpdate)
}
}, [profile.did, onUpdate])
// react to profile updates
useEffect(() => {
// dont fire on first run to avoid needless re-renders
if (!firstRun.current) {
setState({ts: Date.now(), value: fromProfile(profile)})
}
firstRun.current = false
}, [profile])
return useMemo(() => {
return state.ts > ifAfterTS
? mergeShadow(profile, state.value)
: {...profile, isShadowed: true}
}, [profile, state, ifAfterTS])
}
export function updateProfileShadow(
uri: string,
value: Partial<ProfileShadow>,
) {
emitter.emit(uri, value)
}
export function isProfileShadowed<T extends ProfileView>(
v: T | Shadow<T>,
): v is Shadow<T> {
return 'isShadowed' in v && !!v.isShadowed
}
function fromProfile(profile: ProfileView): ProfileShadow {
return {
followingUri: profile.viewer?.following,
muted: profile.viewer?.muted,
blockingUri: profile.viewer?.blocking,
}
}
function mergeShadow(
profile: ProfileView,
shadow: ProfileShadow,
): Shadow<ProfileView> {
return {
...profile,
viewer: {
...(profile.viewer || {}),
following: shadow.followingUri,
muted: shadow.muted,
blocking: shadow.blockingUri,
},
isShadowed: true,
}
}
|
