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import React from 'react'
import {observer} from 'mobx-react-lite'
import {View, FlatList} from 'react-native'
import {NotificationsViewModel} from '../../../state/models/notifications-view'
import {FeedItem} from './FeedItem'
import {NotificationFeedLoadingPlaceholder} from '../util/LoadingPlaceholder'
import {ErrorMessage} from '../util/error/ErrorMessage'
import {EmptyState} from '../util/EmptyState'
import {OnScrollCb} from '../../lib/hooks/useOnMainScroll'
const EMPTY_FEED_ITEM = {_reactKey: '__empty__'}
export const Feed = observer(function Feed({
view,
onPressTryAgain,
onScroll,
}: {
view: NotificationsViewModel
onPressTryAgain?: () => void
onScroll?: OnScrollCb
}) {
// 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 === EMPTY_FEED_ITEM) {
return (
<EmptyState
icon="bell"
message="No notifications yet!"
style={{paddingVertical: 40}}
/>
)
}
return <FeedItem item={item} />
}
const onRefresh = () => {
view
.refresh()
.catch(err =>
view.rootStore.log.error('Failed to refresh notifications feed', err),
)
}
const onEndReached = () => {
view
.loadMore()
.catch(err =>
view.rootStore.log.error('Failed to load more notifications', err),
)
}
let data
if (view.hasLoaded) {
if (view.isEmpty) {
data = [EMPTY_FEED_ITEM]
} else {
data = view.notifications
}
}
return (
<View style={{flex: 1}}>
{view.isLoading && !data && <NotificationFeedLoadingPlaceholder />}
{view.hasError && (
<ErrorMessage
message={view.error}
style={{margin: 6}}
onPressTryAgain={onPressTryAgain}
/>
)}
{data && (
<FlatList
data={data}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={view.isRefreshing}
onRefresh={onRefresh}
onEndReached={onEndReached}
onScroll={onScroll}
contentContainerStyle={{paddingBottom: 200}}
/>
)}
</View>
)
})
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