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import React from 'react'
import {AppState, AppStateStatus} from 'react-native'
import {AppBskyFeedDefs, BskyAgent} from '@atproto/api'
import throttle from 'lodash.throttle'
import {PROD_DEFAULT_FEED} from '#/lib/constants'
import {logger} from '#/logger'
import {
FeedDescriptor,
FeedPostSliceItem,
isFeedPostSlice,
} from '#/state/queries/post-feed'
import {useAgent} from './session'
type StateContext = {
enabled: boolean
onItemSeen: (item: any) => void
sendInteraction: (interaction: AppBskyFeedDefs.Interaction) => void
}
const stateContext = React.createContext<StateContext>({
enabled: false,
onItemSeen: (_item: any) => {},
sendInteraction: (_interaction: AppBskyFeedDefs.Interaction) => {},
})
export function useFeedFeedback(feed: FeedDescriptor, hasSession: boolean) {
const agent = useAgent()
const enabled = isDiscoverFeed(feed) && hasSession
const queue = React.useRef<Set<string>>(new Set())
const history = React.useRef<
// Use a WeakSet so that we don't need to clear it.
// This assumes that referential identity of slice items maps 1:1 to feed (re)fetches.
WeakSet<FeedPostSliceItem | AppBskyFeedDefs.Interaction>
>(new WeakSet())
const sendToFeedNoDelay = React.useCallback(() => {
const proxyAgent = agent.withProxy(
// @ts-ignore TODO need to update withProxy() to support this key -prf
'bsky_fg',
// TODO when we start sending to other feeds, we need to grab their DID -prf
'did:web:discover.bsky.app',
) as BskyAgent
const interactions = Array.from(queue.current).map(toInteraction)
queue.current.clear()
proxyAgent.app.bsky.feed
.sendInteractions({interactions})
.catch((e: any) => {
logger.warn('Failed to send feed interactions', {error: e})
})
}, [agent])
const sendToFeed = React.useMemo(
() =>
throttle(sendToFeedNoDelay, 15e3, {
leading: false,
trailing: true,
}),
[sendToFeedNoDelay],
)
React.useEffect(() => {
if (!enabled) {
return
}
const sub = AppState.addEventListener('change', (state: AppStateStatus) => {
if (state === 'background') {
sendToFeed.flush()
}
})
return () => sub.remove()
}, [enabled, sendToFeed])
const onItemSeen = React.useCallback(
(slice: any) => {
if (!enabled) {
return
}
if (!isFeedPostSlice(slice)) {
return
}
for (const postItem of slice.items) {
if (!history.current.has(postItem)) {
history.current.add(postItem)
queue.current.add(
toString({
item: postItem.uri,
event: 'app.bsky.feed.defs#interactionSeen',
feedContext: postItem.feedContext,
}),
)
sendToFeed()
}
}
},
[enabled, sendToFeed],
)
const sendInteraction = React.useCallback(
(interaction: AppBskyFeedDefs.Interaction) => {
if (!enabled) {
return
}
if (!history.current.has(interaction)) {
history.current.add(interaction)
queue.current.add(toString(interaction))
sendToFeed()
}
},
[enabled, sendToFeed],
)
return React.useMemo(() => {
return {
enabled,
// pass this method to the <List> onItemSeen
onItemSeen,
// call on various events
// queues the event to be sent with the throttled sendToFeed call
sendInteraction,
}
}, [enabled, onItemSeen, sendInteraction])
}
export const FeedFeedbackProvider = stateContext.Provider
export function useFeedFeedbackContext() {
return React.useContext(stateContext)
}
// TODO
// We will introduce a permissions framework for 3p feeds to
// take advantage of the feed feedback API. Until that's in
// place, we're hardcoding it to the discover feed.
// -prf
function isDiscoverFeed(feed: FeedDescriptor) {
return feed === `feedgen|${PROD_DEFAULT_FEED('whats-hot')}`
}
function toString(interaction: AppBskyFeedDefs.Interaction): string {
return `${interaction.item}|${interaction.event}|${
interaction.feedContext || ''
}`
}
function toInteraction(str: string): AppBskyFeedDefs.Interaction {
const [item, event, feedContext] = str.split('|')
return {item, event, feedContext}
}
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