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import React, {useRef} from 'react'
import {observer} from 'mobx-react-lite'
import {ActivityIndicator, FlatList, View} from 'react-native'
import {
PostThreadViewModel,
PostThreadViewPostModel,
} from '../../../state/models/post-thread-view'
import {PostThreadItem} from './PostThreadItem'
import {ErrorMessage} from '../util/error/ErrorMessage'
export const PostThread = observer(function PostThread({
uri,
view,
}: {
uri: string
view: PostThreadViewModel
}) {
const ref = useRef<FlatList>(null)
const posts = view.thread ? Array.from(flattenThread(view.thread)) : []
const onRefresh = () => {
view?.refresh().catch(err => console.error('Failed to refresh', err))
}
const onLayout = () => {
const index = posts.findIndex(post => post._isHighlightedPost)
if (index !== -1) {
ref.current?.scrollToIndex({
index,
animated: false,
viewOffset: 40,
})
}
}
const onScrollToIndexFailed = (info: {
index: number
highestMeasuredFrameIndex: number
averageItemLength: number
}) => {
ref.current?.scrollToOffset({
animated: false,
offset: info.averageItemLength * info.index,
})
}
// loading
// =
if ((view.isLoading && !view.isRefreshing) || view.params.uri !== uri) {
return (
<View>
<ActivityIndicator />
</View>
)
}
// error
// =
if (view.hasError) {
return (
<View>
<ErrorMessage
message={view.error}
style={{margin: 6}}
onPressTryAgain={onRefresh}
/>
</View>
)
}
// loaded
// =
const renderItem = ({item}: {item: PostThreadViewPostModel}) => (
<PostThreadItem item={item} onPostReply={onRefresh} />
)
return (
<FlatList
ref={ref}
data={posts}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={view.isRefreshing}
onRefresh={onRefresh}
onLayout={onLayout}
onScrollToIndexFailed={onScrollToIndexFailed}
style={{flex: 1}}
contentContainerStyle={{paddingBottom: 200}}
/>
)
})
function* flattenThread(
post: PostThreadViewPostModel,
isAscending = false,
): Generator<PostThreadViewPostModel, 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 (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
}
}
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