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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 {
PostThreadViewModel,
PostThreadViewPostModel,
} from '../../../state/models/post-thread-view'
import {useStores} from '../../../state'
import {SharePostModel} from '../../../state/models/shell-ui'
import {PostThreadItem} from './PostThreadItem'
import {ErrorMessage} from '../util/ErrorMessage'
export const PostThread = observer(function PostThread({
uri,
view,
}: {
uri: string
view: PostThreadViewModel
}) {
const store = useStores()
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.isLoading && !view.isRefreshing) || view.params.uri !== uri) {
return (
<View>
<ActivityIndicator />
</View>
)
}
// error
// =
if (view.hasError) {
return (
<View>
<ErrorMessage
dark
message={view.error}
style={{margin: 6}}
onPressTryAgain={onRefresh}
/>
</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}
style={{flex: 1}}
/>
)
})
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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