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import React, {MutableRefObject} from 'react'
import {observer} from 'mobx-react-lite'
import {CenteredView, FlatList} from '../util/Views'
import {ActivityIndicator, RefreshControl, StyleSheet, View} from 'react-native'
import {NotificationsFeedModel} from 'state/models/feeds/notifications'
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 {OnScrollCb} from 'lib/hooks/useOnMainScroll'
import {s} from 'lib/styles'
import {usePalette} from 'lib/hooks/usePalette'
const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
const LOAD_MORE_ERROR_ITEM = {_reactKey: '__load_more_error__'}
const LOADING_SPINNER = {_reactKey: '__loading_spinner__'}
export const Feed = observer(function Feed({
view,
scrollElRef,
onPressTryAgain,
onScroll,
}: {
view: NotificationsFeedModel
scrollElRef?: MutableRefObject<FlatList<any> | null>
onPressTryAgain?: () => void
onScroll?: OnScrollCb
}) {
const pal = usePalette('default')
const [isPTRing, setIsPTRing] = React.useState(false)
const data = React.useMemo(() => {
let feedItems: any[] = []
if (view.isRefreshing && !isPTRing) {
feedItems = [LOADING_SPINNER]
}
if (view.hasLoaded) {
if (view.isEmpty) {
feedItems = feedItems.concat([EMPTY_FEED_ITEM])
} else {
feedItems = feedItems.concat(view.notifications)
}
}
if (view.loadMoreError) {
feedItems = (feedItems || []).concat([LOAD_MORE_ERROR_ITEM])
}
return feedItems
}, [
view.hasLoaded,
view.isEmpty,
view.notifications,
view.loadMoreError,
view.isRefreshing,
isPTRing,
])
const onRefresh = React.useCallback(async () => {
try {
setIsPTRing(true)
await view.refresh()
} catch (err) {
view.rootStore.log.error('Failed to refresh notifications feed', err)
} finally {
setIsPTRing(false)
}
}, [view, setIsPTRing])
const onEndReached = React.useCallback(async () => {
try {
await view.loadMore()
} catch (err) {
view.rootStore.log.error('Failed to load more notifications', err)
}
}, [view])
const onPressRetryLoadMore = React.useCallback(() => {
view.retryLoadMore()
}, [view])
// 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_SPINNER) {
return (
<View style={styles.loading}>
<ActivityIndicator size="small" />
</View>
)
}
return <FeedItem item={item} />
},
[onPressRetryLoadMore],
)
const FeedFooter = React.useCallback(
() =>
view.isLoading ? (
<View style={styles.feedFooter}>
<ActivityIndicator />
</View>
) : (
<View />
),
[view],
)
return (
<View style={s.hContentRegion}>
<CenteredView>
{view.isLoading && !data.length && (
<NotificationFeedLoadingPlaceholder />
)}
{view.hasError && (
<ErrorMessage
message={view.error}
onPressTryAgain={onPressTryAgain}
/>
)}
</CenteredView>
{data.length ? (
<FlatList
testID="notifsFeed"
ref={scrollElRef}
data={data}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
ListFooterComponent={FeedFooter}
refreshControl={
<RefreshControl
refreshing={isPTRing}
onRefresh={onRefresh}
tintColor={pal.colors.text}
titleColor={pal.colors.text}
/>
}
onEndReached={onEndReached}
onEndReachedThreshold={0.6}
onScroll={onScroll}
scrollEventThrottle={100}
contentContainerStyle={s.contentContainer}
/>
) : null}
</View>
)
})
const styles = StyleSheet.create({
loading: {
paddingVertical: 20,
},
feedFooter: {paddingTop: 20},
emptyState: {paddingVertical: 40},
})
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