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import React, {MutableRefObject} from 'react'
import {observer} from 'mobx-react-lite'
import {
ActivityIndicator,
View,
FlatList,
StyleProp,
StyleSheet,
ViewStyle,
} from 'react-native'
import {PostFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
import {EmptyState} from '../util/EmptyState'
import {ErrorMessage} from '../util/error/ErrorMessage'
import {FeedModel} from '../../../state/models/feed-view'
import {FeedItem} from './FeedItem'
import {PromptButtons} from './PromptButtons'
import {OnScrollCb} from '../../lib/hooks/useOnMainScroll'
import {s} from '../../lib/styles'
const COMPOSE_PROMPT_ITEM = {_reactKey: '__prompt__'}
const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
export const Feed = observer(function Feed({
feed,
style,
scrollElRef,
onPressCompose,
onPressTryAgain,
onScroll,
testID,
}: {
feed: FeedModel
style?: StyleProp<ViewStyle>
scrollElRef?: MutableRefObject<FlatList<any> | null>
onPressCompose: (imagesOpen?: boolean) => void
onPressTryAgain?: () => void
onScroll?: OnScrollCb
testID?: string
}) {
// 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 = ({item}: {item: any}) => {
if (item === COMPOSE_PROMPT_ITEM) {
return <PromptButtons onPressCompose={onPressCompose} />
} else if (item === EMPTY_FEED_ITEM) {
return (
<EmptyState
icon="bars"
message="This feed is empty!"
style={styles.emptyState}
/>
)
} else {
return <FeedItem item={item} />
}
}
const onRefresh = () => {
feed
.refresh()
.catch(err =>
feed.rootStore.log.error('Failed to refresh posts feed', err),
)
}
const onEndReached = () => {
feed
.loadMore()
.catch(err => feed.rootStore.log.error('Failed to load more posts', err))
}
let data
if (feed.hasLoaded) {
if (feed.isEmpty) {
data = [COMPOSE_PROMPT_ITEM, EMPTY_FEED_ITEM]
} else {
data = [COMPOSE_PROMPT_ITEM].concat(feed.feed)
}
}
const FeedFooter = () =>
feed.isLoading ? (
<View style={styles.feedFooter}>
<ActivityIndicator />
</View>
) : (
<View />
)
return (
<View testID={testID} style={style}>
{!data && <PromptButtons onPressCompose={onPressCompose} />}
{feed.isLoading && !data && <PostFeedLoadingPlaceholder />}
{feed.hasError && (
<ErrorMessage message={feed.error} onPressTryAgain={onPressTryAgain} />
)}
{feed.hasLoaded && data && (
<FlatList
ref={scrollElRef}
data={data}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
ListFooterComponent={FeedFooter}
refreshing={feed.isRefreshing}
contentContainerStyle={s.contentContainer}
onScroll={onScroll}
onRefresh={onRefresh}
onEndReached={onEndReached}
/>
)}
</View>
)
})
const styles = StyleSheet.create({
feedFooter: {paddingTop: 20},
emptyState: {paddingVertical: 40},
})
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