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import React, {MutableRefObject} from 'react'
import {observer} from 'mobx-react-lite'
import {View, FlatList, StyleProp, ViewStyle} from 'react-native'
import {PostFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
import {EmptyState} from '../util/EmptyState'
import {ErrorMessage} from '../util/ErrorMessage'
import {FeedModel, FeedItemModel} from '../../../state/models/feed-view'
import {FeedItem} from './FeedItem'
import {ComposePrompt} from '../composer/Prompt'
const COMPOSE_PROMPT_ITEM = {_reactKey: '__prompt__'}
export const Feed = observer(function Feed({
feed,
style,
scrollElRef,
onPressCompose,
onPressTryAgain,
}: {
feed: FeedModel
style?: StyleProp<ViewStyle>
scrollElRef?: MutableRefObject<FlatList<any> | null>
onPressCompose?: () => void
onPressTryAgain?: () => void
}) {
// 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: FeedItemModel}) => {
if (item === COMPOSE_PROMPT_ITEM) {
return <ComposePrompt onPressCompose={onPressCompose} />
} else {
return <FeedItem item={item} />
}
}
const onRefresh = () => {
feed.refresh().catch(err => console.error('Failed to refresh', err))
}
const onEndReached = () => {
feed.loadMore().catch(err => console.error('Failed to load more', err))
}
return (
<View style={style}>
{feed.isLoading && !feed.isRefreshing && !feed.hasContent && (
<PostFeedLoadingPlaceholder />
)}
{feed.hasError && (
<ErrorMessage
dark
message={feed.error}
style={{margin: 6}}
onPressTryAgain={onPressTryAgain}
/>
)}
{feed.hasContent && (
<FlatList
ref={scrollElRef}
data={[COMPOSE_PROMPT_ITEM].concat(feed.feed.slice())}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={feed.isRefreshing}
contentContainerStyle={{paddingBottom: 100}}
onRefresh={onRefresh}
onEndReached={onEndReached}
/>
)}
{feed.isEmpty && <EmptyState icon="bars" message="This feed is empty!" />}
</View>
)
})
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