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import React, {useState, useEffect} from 'react'
import {observer} from 'mobx-react-lite'
import {ActivityIndicator, FlatList, Text, View} from 'react-native'
import {OnNavigateContent} from '../../routes/types'
import {
PostThreadViewModel,
PostThreadViewPostModel,
} from '../../../state/models/post-thread-view'
import {useStores} from '../../../state'
import {PostThreadItem} from './PostThreadItem'
export const PostThread = observer(function PostThread({
uri,
onNavigateContent,
}: {
uri: string
onNavigateContent: OnNavigateContent
}) {
const store = useStores()
const [view, setView] = useState<PostThreadViewModel | undefined>()
useEffect(() => {
if (view?.params.uri === uri) {
console.log('Post thread doing nothing')
return // no change needed? or trigger refresh?
}
console.log('Fetching post thread', uri)
const newView = new PostThreadViewModel(store, {uri})
setView(newView)
newView.setup().catch(err => console.error('Failed to fetch thread', err))
}, [uri, view?.params.uri, store])
// not yet setup
if (
!view ||
(view.isLoading && !view.isRefreshing) ||
view.params.uri !== uri
) {
return (
<View>
<ActivityIndicator />
</View>
)
}
// error
if (view.hasError) {
return (
<View>
<Text>{view.error}</Text>
</View>
)
}
// rendering
const posts = Array.from(flattenThread(view.thread))
const renderItem = ({item}: {item: PostThreadViewPostModel}) => (
<PostThreadItem item={item} onNavigateContent={onNavigateContent} />
)
const onRefresh = () => {
view.refresh().catch(err => console.error('Failed to refresh', err))
}
return (
<View>
{view.isRefreshing && <ActivityIndicator />}
{view.hasContent && (
<FlatList
data={posts}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={view.isRefreshing}
onRefresh={onRefresh}
/>
)}
</View>
)
})
function* flattenThread(
post: PostThreadViewPostModel,
): Generator<PostThreadViewPostModel, void> {
yield post
if (post.replies?.length) {
for (const reply of post.replies) {
yield* flattenThread(reply)
}
}
}
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