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import React, {useEffect} from 'react'
import {FlatList, View} from 'react-native'
import {useFocusEffect} from '@react-navigation/native'
import useAppState from 'react-native-appstate-hook'
import {
NativeStackScreenProps,
NotificationsTabNavigatorParams,
} from 'lib/routes/types'
import {ViewHeader} from '../com/util/ViewHeader'
import {Feed} from '../com/notifications/Feed'
import {useStores} from 'state/index'
import {useOnMainScroll} from 'lib/hooks/useOnMainScroll'
import {s} from 'lib/styles'
import {useAnalytics} from 'lib/analytics'
const NOTIFICATIONS_POLL_INTERVAL = 15e3
type Props = NativeStackScreenProps<
NotificationsTabNavigatorParams,
'Notifications'
>
export const NotificationsScreen = ({}: Props) => {
const store = useStores()
const onMainScroll = useOnMainScroll(store)
const scrollElRef = React.useRef<FlatList>(null)
const {screen} = useAnalytics()
const {appState} = useAppState({
onForeground: () => doPoll(true),
})
// event handlers
// =
const onPressTryAgain = () => {
store.me.notifications.refresh()
}
const scrollToTop = React.useCallback(() => {
scrollElRef.current?.scrollToOffset({offset: 0})
}, [scrollElRef])
// periodic polling
// =
const doPoll = React.useCallback(
async (isForegrounding = false) => {
if (isForegrounding) {
// app is foregrounding, refresh optimistically
store.log.debug('NotificationsScreen: Refreshing on app foreground')
await Promise.all([
store.me.notifications.loadUnreadCount(),
store.me.notifications.refresh(),
])
} else if (appState === 'active') {
// periodic poll, refresh if there are new notifs
store.log.debug('NotificationsScreen: Polling for new notifications')
const didChange = await store.me.notifications.loadUnreadCount()
if (didChange) {
store.log.debug('NotificationsScreen: Loading new notifications')
await store.me.notifications.loadLatest()
}
}
},
[appState, store],
)
useEffect(() => {
const pollInterval = setInterval(doPoll, NOTIFICATIONS_POLL_INTERVAL)
return () => clearInterval(pollInterval)
}, [doPoll])
// on-visible setup
// =
useFocusEffect(
React.useCallback(() => {
store.log.debug('NotificationsScreen: Updating feed')
const softResetSub = store.onScreenSoftReset(scrollToTop)
store.me.notifications.update()
screen('Notifications')
return () => {
softResetSub.remove()
store.me.notifications.markAllRead()
}
}, [store, screen, scrollToTop]),
)
return (
<View style={s.hContentRegion}>
<ViewHeader title="Notifications" canGoBack={false} />
<Feed
view={store.me.notifications}
onPressTryAgain={onPressTryAgain}
onScroll={onMainScroll}
scrollElRef={scrollElRef}
/>
</View>
)
}
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