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import React, {MutableRefObject} from 'react'
import {observer} from 'mobx-react-lite'
import {
ActivityIndicator,
RefreshControl,
StyleProp,
StyleSheet,
View,
ViewStyle,
} from 'react-native'
import {FlatList} from '../util/Views'
import {PostFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
import {ErrorMessage} from '../util/error/ErrorMessage'
import {PostsFeedModel} from 'state/models/feeds/posts'
import {FeedSlice} from './FeedSlice'
import {LoadMoreRetryBtn} from '../util/LoadMoreRetryBtn'
import {OnScrollCb} from 'lib/hooks/useOnMainScroll'
import {s} from 'lib/styles'
import {useAnalytics} from 'lib/analytics'
import {usePalette} from 'lib/hooks/usePalette'
import {useTheme} from 'lib/ThemeContext'
const LOADING_ITEM = {_reactKey: '__loading__'}
const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
const ERROR_ITEM = {_reactKey: '__error__'}
const LOAD_MORE_ERROR_ITEM = {_reactKey: '__load_more_error__'}
export const Feed = observer(function Feed({
feed,
style,
showPostFollowBtn,
scrollElRef,
onPressTryAgain,
onScroll,
scrollEventThrottle,
onMomentumScrollEnd,
renderEmptyState,
testID,
headerOffset = 0,
ListHeaderComponent,
extraData,
}: {
feed: PostsFeedModel
style?: StyleProp<ViewStyle>
showPostFollowBtn?: boolean
scrollElRef?: MutableRefObject<FlatList<any> | null>
onPressTryAgain?: () => void
onScroll?: OnScrollCb
scrollEventThrottle?: number
renderEmptyState?: () => JSX.Element
testID?: string
headerOffset?: number
ListHeaderComponent?: () => JSX.Element
extraData?: any
}) {
const pal = usePalette('default')
const theme = useTheme()
const {track} = useAnalytics()
const [isRefreshing, setIsRefreshing] = React.useState(false)
const data = React.useMemo(() => {
let feedItems: any[] = []
if (feed.hasLoaded) {
if (feed.hasError) {
feedItems = feedItems.concat([ERROR_ITEM])
}
if (feed.isEmpty) {
feedItems = feedItems.concat([EMPTY_FEED_ITEM])
} else {
feedItems = feedItems.concat(feed.slices)
}
if (feed.loadMoreError) {
feedItems = feedItems.concat([LOAD_MORE_ERROR_ITEM])
}
} else if (feed.isLoading) {
feedItems = feedItems.concat([LOADING_ITEM])
}
return feedItems
}, [
feed.hasError,
feed.hasLoaded,
feed.isLoading,
feed.isEmpty,
feed.slices,
feed.loadMoreError,
])
// events
// =
const onRefresh = React.useCallback(async () => {
track('Feed:onRefresh')
setIsRefreshing(true)
try {
await feed.refresh()
} catch (err) {
feed.rootStore.log.error('Failed to refresh posts feed', err)
}
setIsRefreshing(false)
}, [feed, track, setIsRefreshing])
const onEndReached = React.useCallback(async () => {
track('Feed:onEndReached')
try {
await feed.loadMore()
} catch (err) {
feed.rootStore.log.error('Failed to load more posts', err)
}
}, [feed, track])
const onPressRetryLoadMore = React.useCallback(() => {
feed.retryLoadMore()
}, [feed])
// rendering
// =
const renderItem = React.useCallback(
({item}: {item: any}) => {
if (item === EMPTY_FEED_ITEM) {
if (renderEmptyState) {
return renderEmptyState()
}
return <View />
} else if (item === ERROR_ITEM) {
return (
<ErrorMessage
message={feed.error}
onPressTryAgain={onPressTryAgain}
/>
)
} else if (item === LOAD_MORE_ERROR_ITEM) {
return (
<LoadMoreRetryBtn
label="There was an issue fetching posts. Tap here to try again."
onPress={onPressRetryLoadMore}
/>
)
} else if (item === LOADING_ITEM) {
return <PostFeedLoadingPlaceholder />
}
return <FeedSlice slice={item} showFollowBtn={showPostFollowBtn} />
},
[
feed,
onPressTryAgain,
onPressRetryLoadMore,
showPostFollowBtn,
renderEmptyState,
],
)
const FeedFooter = React.useCallback(
() =>
feed.isLoading ? (
<View style={styles.feedFooter}>
<ActivityIndicator />
</View>
) : (
<View />
),
[feed],
)
return (
<View testID={testID} style={style}>
{data.length > 0 && (
<FlatList
testID={testID ? `${testID}-flatlist` : undefined}
ref={scrollElRef}
data={data}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
ListFooterComponent={FeedFooter}
ListHeaderComponent={ListHeaderComponent}
refreshControl={
<RefreshControl
refreshing={isRefreshing}
onRefresh={onRefresh}
tintColor={pal.colors.text}
titleColor={pal.colors.text}
progressViewOffset={headerOffset}
/>
}
contentContainerStyle={s.contentContainer}
style={{paddingTop: headerOffset}}
onScroll={onScroll}
scrollEventThrottle={scrollEventThrottle}
onMomentumScrollEnd={onMomentumScrollEnd}
indicatorStyle={theme.colorScheme === 'dark' ? 'white' : 'black'}
onEndReached={onEndReached}
onEndReachedThreshold={0.6}
removeClippedSubviews={true}
contentOffset={{x: 0, y: headerOffset * -1}}
extraData={extraData}
// @ts-ignore our .web version only -prf
desktopFixedHeight
/>
)}
</View>
)
})
const styles = StyleSheet.create({
feedFooter: {paddingTop: 20},
})
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