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import React from 'react'
import {
Animated,
FlatList,
StyleSheet,
View,
useWindowDimensions,
} from 'react-native'
import {useFocusEffect, useIsFocused} from '@react-navigation/native'
import {observer} from 'mobx-react-lite'
import useAppState from 'react-native-appstate-hook'
import {NativeStackScreenProps, HomeTabNavigatorParams} from 'lib/routes/types'
import {FeedModel} from 'state/models/feed-view'
import {withAuthRequired} from 'view/com/auth/withAuthRequired'
import {Feed} from '../com/posts/Feed'
import {LoadLatestBtn} from '../com/util/LoadLatestBtn'
import {TabBar} from 'view/com/util/TabBar'
import {Pager, PageSelectedEvent, TabBarProps} from 'view/com/util/Pager'
import {FAB} from '../com/util/FAB'
import {useStores} from 'state/index'
import {usePalette} from 'lib/hooks/usePalette'
import {s} from 'lib/styles'
import {useOnMainScroll} from 'lib/hooks/useOnMainScroll'
import {useSafeAreaInsets} from 'react-native-safe-area-context'
import {useAnimatedValue} from 'lib/hooks/useAnimatedValue'
import {useAnalytics} from 'lib/analytics'
import {ComposeIcon2} from 'lib/icons'
import {clamp} from 'lodash'
const TAB_BAR_HEIGHT = 82
const BOTTOM_BAR_HEIGHT = 48
type Props = NativeStackScreenProps<HomeTabNavigatorParams, 'Home'>
export const HomeScreen = withAuthRequired((_opts: Props) => {
const store = useStores()
const [selectedPage, setSelectedPage] = React.useState(0)
const algoFeed = React.useMemo(() => {
const feed = new FeedModel(store, 'goodstuff', {})
feed.setup()
return feed
}, [store])
useFocusEffect(
React.useCallback(() => {
store.shell.setIsDrawerSwipeDisabled(selectedPage > 0)
return () => {
store.shell.setIsDrawerSwipeDisabled(false)
}
}, [store, selectedPage]),
)
const onPageSelected = React.useCallback(
(e: PageSelectedEvent) => {
setSelectedPage(e.nativeEvent.position)
store.shell.setIsDrawerSwipeDisabled(e.nativeEvent.position > 0)
},
[store],
)
const onPressSelected = React.useCallback(() => {
store.emitScreenSoftReset()
}, [store])
const renderTabBar = React.useCallback((props: TabBarProps) => {
return <FloatingTabBar {...props} onPressSelected={onPressSelected} />
}, [])
return (
<Pager
onPageSelected={onPageSelected}
renderTabBar={renderTabBar}
tabBarPosition="bottom">
<FeedPage key="1" isPageFocused={selectedPage === 0} feed={algoFeed} />
<FeedPage
key="2"
isPageFocused={selectedPage === 1}
feed={store.me.mainFeed}
/>
</Pager>
)
})
const FloatingTabBar = observer((props: TabBarProps) => {
const store = useStores()
const safeAreaInsets = useSafeAreaInsets()
const pal = usePalette('default')
const interp = useAnimatedValue(0)
const pad = React.useMemo(
() => ({
paddingBottom: clamp(safeAreaInsets.bottom, 15, 20),
}),
[safeAreaInsets],
)
React.useEffect(() => {
Animated.timing(interp, {
toValue: store.shell.minimalShellMode ? 0 : 1,
duration: 100,
useNativeDriver: true,
isInteraction: false,
}).start()
}, [interp, store.shell.minimalShellMode])
const transform = {
transform: [
{translateY: Animated.multiply(interp, -1 * BOTTOM_BAR_HEIGHT)},
],
}
return (
<Animated.View
style={[pal.view, pal.border, styles.tabBar, pad, transform]}>
<TabBar
items={['Suggested', 'Following']}
{...props}
indicatorPosition="top"
indicatorColor={pal.colors.link}
/>
</Animated.View>
)
})
const FeedPage = observer(
({isPageFocused, feed}: {feed: FeedModel; isPageFocused: boolean}) => {
const store = useStores()
const onMainScroll = useOnMainScroll(store)
const {screen, track} = useAnalytics()
const scrollElRef = React.useRef<FlatList>(null)
const {appState} = useAppState({
onForeground: () => doPoll(true),
})
const isScreenFocused = useIsFocused()
const winDim = useWindowDimensions()
const containerStyle = React.useMemo(
() => ({height: winDim.height - TAB_BAR_HEIGHT}),
[winDim],
)
const doPoll = React.useCallback(
(knownActive = false) => {
if (
(!knownActive && appState !== 'active') ||
!isScreenFocused ||
!isPageFocused
) {
return
}
if (feed.isLoading) {
return
}
store.log.debug('HomeScreen: Polling for new posts')
feed.checkForLatest()
},
[appState, isScreenFocused, isPageFocused, store, feed],
)
const scrollToTop = React.useCallback(() => {
scrollElRef.current?.scrollToOffset({offset: 0})
}, [scrollElRef])
const onSoftReset = React.useCallback(() => {
if (isPageFocused) {
scrollToTop()
}
}, [isPageFocused, scrollToTop])
useFocusEffect(
React.useCallback(() => {
const softResetSub = store.onScreenSoftReset(onSoftReset)
const feedCleanup = feed.registerListeners()
const pollInterval = setInterval(doPoll, 15e3)
screen('Feed')
store.log.debug('HomeScreen: Updating feed')
if (feed.hasContent) {
feed.update()
}
return () => {
clearInterval(pollInterval)
softResetSub.remove()
feedCleanup()
}
}, [store, doPoll, onSoftReset, screen, feed]),
)
const onPressCompose = React.useCallback(() => {
track('HomeScreen:PressCompose')
store.shell.openComposer({})
}, [store, track])
const onPressTryAgain = React.useCallback(() => {
feed.refresh()
}, [feed])
const onPressLoadLatest = React.useCallback(() => {
feed.refresh()
scrollToTop()
}, [feed, scrollToTop])
return (
<View style={containerStyle}>
<Feed
testID="homeFeed"
key="default"
feed={feed}
scrollElRef={scrollElRef}
style={s.hContentRegion}
showPostFollowBtn
onPressTryAgain={onPressTryAgain}
onScroll={onMainScroll}
/>
{feed.hasNewLatest && !feed.isRefreshing && (
<LoadLatestBtn onPress={onPressLoadLatest} />
)}
<FAB
testID="composeFAB"
onPress={onPressCompose}
icon={<ComposeIcon2 strokeWidth={1.5} size={29} style={s.white} />}
/>
</View>
)
},
)
const styles = StyleSheet.create({
tabBar: {
position: 'absolute',
left: 0,
right: 0,
bottom: 0,
flexDirection: 'row',
alignItems: 'center',
paddingHorizontal: 8,
borderTopWidth: 1,
paddingTop: 0,
paddingBottom: 30,
},
tabBarAvi: {
marginRight: 4,
},
})
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