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import React, {useCallback, useEffect, useRef} from 'react'
import {
Dimensions,
FlatList,
NativeScrollEvent,
NativeSyntheticEvent,
Platform,
View,
} from 'react-native'
import {KeyboardAvoidingView} from 'react-native-keyboard-controller'
import {useSafeAreaInsets} from 'react-native-safe-area-context'
import {msg, Trans} from '@lingui/macro'
import {useLingui} from '@lingui/react'
import {useFocusEffect} from '@react-navigation/native'
import {useChat} from '#/state/messages'
import {ConvoItem, ConvoStatus} from '#/state/messages/convo'
import {useSetMinimalShellMode} from '#/state/shell'
import {MessageInput} from '#/screens/Messages/Conversation/MessageInput'
import {atoms as a} from '#/alf'
import {Button, ButtonText} from '#/components/Button'
import {MessageItem} from '#/components/dms/MessageItem'
import {Loader} from '#/components/Loader'
import {Text} from '#/components/Typography'
function MaybeLoader({isLoading}: {isLoading: boolean}) {
return (
<View
style={{
height: 50,
width: '100%',
alignItems: 'center',
justifyContent: 'center',
}}>
{isLoading && <Loader size="xl" />}
</View>
)
}
function RetryButton({onPress}: {onPress: () => unknown}) {
const {_} = useLingui()
return (
<View style={{alignItems: 'center'}}>
<Button
label={_(msg`Press to Retry`)}
onPress={onPress}
variant="ghost"
color="negative"
size="small">
<ButtonText>
<Trans>Press to Retry</Trans>
</ButtonText>
</Button>
</View>
)
}
function renderItem({item}: {item: ConvoItem}) {
if (item.type === 'message' || item.type === 'pending-message') {
return <MessageItem item={item.message} next={item.nextMessage} />
} else if (item.type === 'deleted-message') {
return <Text>Deleted message</Text>
} else if (item.type === 'pending-retry') {
return <RetryButton onPress={item.retry} />
}
return null
}
function keyExtractor(item: ConvoItem) {
return item.key
}
function onScrollToEndFailed() {
// Placeholder function. You have to give FlatList something or else it will error.
}
export function MessagesList() {
const chat = useChat()
const flatListRef = useRef<FlatList>(null)
// We use this to know if we should scroll after a new clop is added to the list
const isAtBottom = useRef(false)
const currentOffset = React.useRef(0)
const onContentSizeChange = useCallback(() => {
if (currentOffset.current <= 100) {
flatListRef.current?.scrollToOffset({offset: 0, animated: true})
}
}, [])
const onEndReached = useCallback(() => {
chat.service.fetchMessageHistory()
}, [chat])
const onInputFocus = useCallback(() => {
if (!isAtBottom.current) {
flatListRef.current?.scrollToOffset({offset: 0, animated: true})
}
}, [])
const onInputBlur = useCallback(() => {}, [])
const onSendMessage = useCallback(
(text: string) => {
chat.service.sendMessage({
text,
})
},
[chat.service],
)
const onScroll = React.useCallback(
(e: NativeSyntheticEvent<NativeScrollEvent>) => {
currentOffset.current = e.nativeEvent.contentOffset.y
},
[],
)
const setMinShellMode = useSetMinimalShellMode()
useFocusEffect(
useCallback(() => {
setMinShellMode(true)
return () => setMinShellMode(false)
}, [setMinShellMode]),
)
const {bottom: bottomInset} = useSafeAreaInsets()
const keyboardVerticalOffset = useKeyboardVerticalOffset()
return (
<KeyboardAvoidingView
style={[a.flex_1, {marginBottom: bottomInset}]}
keyboardVerticalOffset={keyboardVerticalOffset}
behavior="padding"
contentContainerStyle={a.flex_1}>
<FlatList
ref={flatListRef}
data={
chat.state.status === ConvoStatus.Ready ? chat.state.items : undefined
}
keyExtractor={keyExtractor}
renderItem={renderItem}
contentContainerStyle={{paddingHorizontal: 10}}
// In the future, we might want to adjust this value. Not very concerning right now as long as we are only
// dealing with text. But whenever we have images or other media and things are taller, we will want to lower
// this...probably.
initialNumToRender={20}
// Same with the max to render per batch. Let's be safe for now though.
maxToRenderPerBatch={25}
inverted={true}
onEndReached={onEndReached}
onScrollToIndexFailed={onScrollToEndFailed}
onContentSizeChange={onContentSizeChange}
onScroll={onScroll}
// We don't really need to call this much since there are not any animations that rely on this
scrollEventThrottle={100}
maintainVisibleContentPosition={{
minIndexForVisible: 1,
}}
ListFooterComponent={
<MaybeLoader
isLoading={
chat.state.status === ConvoStatus.Ready &&
chat.state.isFetchingHistory
}
/>
}
removeClippedSubviews={true}
keyboardDismissMode="on-drag"
/>
<MessageInput
onSendMessage={onSendMessage}
onFocus={onInputFocus}
onBlur={onInputBlur}
/>
</KeyboardAvoidingView>
)
}
function useKeyboardVerticalOffset() {
const {top: topInset} = useSafeAreaInsets()
const [screenWindowDifference, setScreenWindowDifference] = React.useState(
() => Dimensions.get('screen').height - Dimensions.get('window').height,
)
useEffect(() => {
const subscription = Dimensions.addEventListener(
'change',
({screen, window}) => {
setScreenWindowDifference(screen.height - window.height)
},
)
return () => subscription.remove()
}, [])
return Platform.select({
ios: topInset,
android: screenWindowDifference,
default: 0,
})
}
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