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import React, {useState, useEffect, useRef} from 'react'
import {observer} from 'mobx-react-lite'
import {ActivityIndicator, FlatList, Text, View} from 'react-native'
import {
PostThreadViewModel,
PostThreadViewPostModel,
} from '../../../state/models/post-thread-view'
import {useStores} from '../../../state'
import {SharePostModel} from '../../../state/models/shell'
import {PostThreadItem} from './PostThreadItem'
const UPDATE_DELAY = 2e3 // wait 2s before refetching the thread for updates
export const PostThread = observer(function PostThread({uri}: {uri: string}) {
const store = useStores()
const [view, setView] = useState<PostThreadViewModel | undefined>()
const [lastUpdate, setLastUpdate] = useState<number>(Date.now())
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])
// TODO
// useFocusEffect(() => {
// if (Date.now() - lastUpdate > UPDATE_DELAY) {
// view?.update()
// setLastUpdate(Date.now())
// }
// })
const onPressShare = (uri: string) => {
store.shell.openModal(new SharePostModel(uri))
}
const onRefresh = () => {
view?.refresh().catch(err => console.error('Failed to refresh', err))
}
// loading
// =
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>
)
}
// loaded
// =
const posts = view.thread ? Array.from(flattenThread(view.thread)) : []
const renderItem = ({item}: {item: PostThreadViewPostModel}) => (
<PostThreadItem
item={item}
onPressShare={onPressShare}
onPostReply={onRefresh}
/>
)
return (
<FlatList
data={posts}
keyExtractor={item => item._reactKey}
renderItem={renderItem}
refreshing={view.isRefreshing}
onRefresh={onRefresh}
/>
)
})
function* flattenThread(
post: PostThreadViewPostModel,
): Generator<PostThreadViewPostModel, void> {
if (post.parent) {
yield* flattenThread(post.parent)
}
yield post
if (post.replies?.length) {
for (const reply of post.replies) {
yield* flattenThread(reply)
}
}
}
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