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import React, {MutableRefObject} from 'react'
import {observer} from 'mobx-react-lite'
import {Text, View, FlatList, StyleProp, ViewStyle} from 'react-native'
import {FeedModel, FeedItemModel} from '../../../state/models/feed-view'
import {FeedItem} from './FeedItem'
export const Feed = observer(function Feed({
feed,
style,
scrollElRef,
}: {
feed: FeedModel
style?: StyleProp<ViewStyle>
scrollElRef?: MutableRefObject<FlatList<any> | null>
}) {
// 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}) => <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 && (
<Text>Loading...</Text>
)}
{feed.hasError && <Text>{feed.error}</Text>}
{feed.hasContent && (
<FlatList
ref={scrollElRef}
data={feed.feed.slice()}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={feed.isRefreshing}
onRefresh={onRefresh}
onEndReached={onEndReached}
/>
)}
{feed.isEmpty && <Text>This feed is empty!</Text>}
</View>
)
})
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