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import React, {useRef} from 'react'
import {observer} from 'mobx-react-lite'
import {ActivityIndicator, StyleSheet, View} from 'react-native'
import {CenteredView, FlatList} from '../util/Views'
import {
PostThreadViewModel,
PostThreadViewPostModel,
} from 'state/models/post-thread-view'
import {PostThreadItem} from './PostThreadItem'
import {ComposePrompt} from '../composer/Prompt'
import {ErrorMessage} from '../util/error/ErrorMessage'
import {s} from 'lib/styles'
import {isDesktopWeb} from 'platform/detection'
import {usePalette} from 'lib/hooks/usePalette'
const REPLY_PROMPT = {_reactKey: '__reply__', _isHighlightedPost: false}
const BOTTOM_BORDER = {
_reactKey: '__bottom_border__',
_isHighlightedPost: false,
}
type YieldedItem = PostThreadViewPostModel | typeof REPLY_PROMPT
export const PostThread = observer(function PostThread({
uri,
view,
onPressReply,
}: {
uri: string
view: PostThreadViewModel
onPressReply: () => void
}) {
const pal = usePalette('default')
const ref = useRef<FlatList>(null)
const [isRefreshing, setIsRefreshing] = React.useState(false)
const posts = React.useMemo(() => {
if (view.thread) {
return Array.from(flattenThread(view.thread)).concat([BOTTOM_BORDER])
}
return []
}, [view.thread])
// events
// =
const onRefresh = React.useCallback(async () => {
setIsRefreshing(true)
try {
view?.refresh()
} catch (err) {
view.rootStore.log.error('Failed to refresh posts thread', err)
}
setIsRefreshing(false)
}, [view, setIsRefreshing])
const onLayout = React.useCallback(() => {
const index = posts.findIndex(post => post._isHighlightedPost)
if (index !== -1) {
ref.current?.scrollToIndex({
index,
animated: false,
viewOffset: 40,
})
}
}, [posts, ref])
const onScrollToIndexFailed = React.useCallback(
(info: {
index: number
highestMeasuredFrameIndex: number
averageItemLength: number
}) => {
ref.current?.scrollToOffset({
animated: false,
offset: info.averageItemLength * info.index,
})
},
[ref],
)
const renderItem = React.useCallback(
({item}: {item: YieldedItem}) => {
if (item === REPLY_PROMPT) {
return <ComposePrompt onPressCompose={onPressReply} />
} else if (item === BOTTOM_BORDER) {
// HACK
// due to some complexities with how flatlist works, this is the easiest way
// I could find to get a border positioned directly under the last item
// -prf
return <View style={[styles.bottomBorder, pal.border]} />
} else if (item instanceof PostThreadViewPostModel) {
return <PostThreadItem item={item} onPostReply={onRefresh} />
}
return <></>
},
[onRefresh, onPressReply, pal],
)
// loading
// =
if ((view.isLoading && !view.isRefreshing) || view.params.uri !== uri) {
return (
<CenteredView>
<ActivityIndicator />
</CenteredView>
)
}
// error
// =
if (view.hasError) {
return (
<CenteredView>
<ErrorMessage message={view.error} onPressTryAgain={onRefresh} />
</CenteredView>
)
}
// loaded
// =
return (
<FlatList
ref={ref}
data={posts}
initialNumToRender={posts.length}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={isRefreshing}
onRefresh={onRefresh}
onLayout={onLayout}
onScrollToIndexFailed={onScrollToIndexFailed}
style={s.hContentRegion}
contentContainerStyle={s.contentContainerExtra}
/>
)
})
function* flattenThread(
post: PostThreadViewPostModel,
isAscending = false,
): Generator<YieldedItem, void> {
if (post.parent) {
if ('notFound' in post.parent && post.parent.notFound) {
// TODO render not found
} else {
yield* flattenThread(post.parent as PostThreadViewPostModel, true)
}
}
yield post
if (isDesktopWeb && post._isHighlightedPost) {
yield REPLY_PROMPT
}
if (post.replies?.length) {
for (const reply of post.replies) {
if ('notFound' in reply && reply.notFound) {
// TODO render not found
} else {
yield* flattenThread(reply as PostThreadViewPostModel)
}
}
} else if (!isAscending && !post.parent && post.post.replyCount > 0) {
post._hasMore = true
}
}
const styles = StyleSheet.create({
bottomBorder: {
borderBottomWidth: 1,
},
})
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