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import React, {MutableRefObject} from 'react'
import {CenteredView, FlatList} from '../util/Views'
import {ActivityIndicator, RefreshControl, StyleSheet, View} from 'react-native'
import {FeedItem} from './FeedItem'
import {NotificationFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
import {ErrorMessage} from '../util/error/ErrorMessage'
import {LoadMoreRetryBtn} from '../util/LoadMoreRetryBtn'
import {EmptyState} from '../util/EmptyState'
import {OnScrollHandler} from 'lib/hooks/useOnMainScroll'
import {useAnimatedScrollHandler} from '#/lib/hooks/useAnimatedScrollHandler_FIXED'
import {s} from 'lib/styles'
import {usePalette} from 'lib/hooks/usePalette'
import {useNotificationFeedQuery} from '#/state/queries/notifications/feed'
import {useUnreadNotificationsApi} from '#/state/queries/notifications/unread'
import {logger} from '#/logger'
import {cleanError} from '#/lib/strings/errors'
import {useModerationOpts} from '#/state/queries/preferences'
const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
const LOAD_MORE_ERROR_ITEM = {_reactKey: '__load_more_error__'}
const LOADING_ITEM = {_reactKey: '__loading__'}
export function Feed({
scrollElRef,
onPressTryAgain,
onScroll,
ListHeaderComponent,
}: {
scrollElRef?: MutableRefObject<FlatList<any> | null>
onPressTryAgain?: () => void
onScroll?: OnScrollHandler
ListHeaderComponent?: () => JSX.Element
}) {
const pal = usePalette('default')
const [isPTRing, setIsPTRing] = React.useState(false)
const moderationOpts = useModerationOpts()
const {markAllRead, checkUnread} = useUnreadNotificationsApi()
const {
data,
isFetching,
isFetched,
isError,
error,
hasNextPage,
isFetchingNextPage,
fetchNextPage,
} = useNotificationFeedQuery({enabled: !!moderationOpts})
const isEmpty = !isFetching && !data?.pages[0]?.items.length
const firstItem = data?.pages[0]?.items[0]
// mark all read on fresh data
// (this will fire each time firstItem changes)
React.useEffect(() => {
if (firstItem) {
markAllRead()
}
}, [firstItem, markAllRead])
const items = React.useMemo(() => {
let arr: any[] = []
if (isFetched) {
if (isEmpty) {
arr = arr.concat([EMPTY_FEED_ITEM])
} else if (data) {
for (const page of data?.pages) {
arr = arr.concat(page.items)
}
}
if (isError && !isEmpty) {
arr = arr.concat([LOAD_MORE_ERROR_ITEM])
}
} else {
arr.push(LOADING_ITEM)
}
return arr
}, [isFetched, isError, isEmpty, data])
const onRefresh = React.useCallback(async () => {
try {
setIsPTRing(true)
await checkUnread({invalidate: true})
} catch (err) {
logger.error('Failed to refresh notifications feed', {
error: err,
})
} finally {
setIsPTRing(false)
}
}, [checkUnread, setIsPTRing])
const onEndReached = React.useCallback(async () => {
if (isFetching || !hasNextPage || isError) return
try {
await fetchNextPage()
} catch (err) {
logger.error('Failed to load more notifications', {error: err})
}
}, [isFetching, hasNextPage, isError, fetchNextPage])
const onPressRetryLoadMore = React.useCallback(() => {
fetchNextPage()
}, [fetchNextPage])
// TODO optimize renderItem or FeedItem, we're getting this notice from RN: -prf
// VirtualizedList: You have a large list that is slow to update - make sure your
// renderItem function renders components that follow React performance best practices
// like PureComponent, shouldComponentUpdate, etc
const renderItem = React.useCallback(
({item}: {item: any}) => {
if (item === EMPTY_FEED_ITEM) {
return (
<EmptyState
icon="bell"
message="No notifications yet!"
style={styles.emptyState}
/>
)
} else if (item === LOAD_MORE_ERROR_ITEM) {
return (
<LoadMoreRetryBtn
label="There was an issue fetching notifications. Tap here to try again."
onPress={onPressRetryLoadMore}
/>
)
} else if (item === LOADING_ITEM) {
return <NotificationFeedLoadingPlaceholder />
}
return <FeedItem item={item} moderationOpts={moderationOpts!} />
},
[onPressRetryLoadMore, moderationOpts],
)
const FeedFooter = React.useCallback(
() =>
isFetchingNextPage ? (
<View style={styles.feedFooter}>
<ActivityIndicator />
</View>
) : (
<View />
),
[isFetchingNextPage],
)
const scrollHandler = useAnimatedScrollHandler(onScroll || {})
return (
<View style={s.hContentRegion}>
{error && (
<CenteredView>
<ErrorMessage
message={cleanError(error)}
onPressTryAgain={onPressTryAgain}
/>
</CenteredView>
)}
<FlatList
testID="notifsFeed"
ref={scrollElRef}
data={items}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
ListHeaderComponent={ListHeaderComponent}
ListFooterComponent={FeedFooter}
refreshControl={
<RefreshControl
refreshing={isPTRing}
onRefresh={onRefresh}
tintColor={pal.colors.text}
titleColor={pal.colors.text}
/>
}
onEndReached={onEndReached}
onEndReachedThreshold={0.6}
onScroll={scrollHandler}
scrollEventThrottle={1}
contentContainerStyle={s.contentContainer}
// @ts-ignore our .web version only -prf
desktopFixedHeight
/>
</View>
)
}
const styles = StyleSheet.create({
feedFooter: {paddingTop: 20},
emptyState: {paddingVertical: 40},
})
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