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import React from 'react'
import {useWindowDimensions} from 'react-native'
import {useFocusEffect} from '@react-navigation/native'
import {AppBskyFeedGetFeed as GetCustomFeed} from '@atproto/api'
import {observer} from 'mobx-react-lite'
import isEqual from 'lodash.isequal'
import {NativeStackScreenProps, HomeTabNavigatorParams} from 'lib/routes/types'
import {PostsFeedModel} from 'state/models/feeds/posts'
import {withAuthRequired} from 'view/com/auth/withAuthRequired'
import {FollowingEmptyState} from 'view/com/posts/FollowingEmptyState'
import {FollowingEndOfFeed} from 'view/com/posts/FollowingEndOfFeed'
import {CustomFeedEmptyState} from 'view/com/posts/CustomFeedEmptyState'
import {FeedsTabBar} from '../com/pager/FeedsTabBar'
import {Pager, PagerRef, RenderTabBarFnProps} from 'view/com/pager/Pager'
import {useStores} from 'state/index'
import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
import {FeedPage} from 'view/com/feeds/FeedPage'
export const POLL_FREQ = 30e3 // 30sec
type Props = NativeStackScreenProps<HomeTabNavigatorParams, 'Home'>
export const HomeScreen = withAuthRequired(
observer(function HomeScreenImpl({}: Props) {
const store = useStores()
const pagerRef = React.useRef<PagerRef>(null)
const [selectedPage, setSelectedPage] = React.useState(0)
const [customFeeds, setCustomFeeds] = React.useState<PostsFeedModel[]>([])
const [requestedCustomFeeds, setRequestedCustomFeeds] = React.useState<
string[]
>([])
React.useEffect(() => {
const {pinned} = store.me.savedFeeds
if (
isEqual(
pinned.map(p => p.uri),
requestedCustomFeeds,
)
) {
// no changes
return
}
const feeds = []
for (const feed of pinned) {
const model = new PostsFeedModel(store, 'custom', {feed: feed.uri})
feeds.push(model)
}
pagerRef.current?.setPage(0)
setCustomFeeds(feeds)
setRequestedCustomFeeds(pinned.map(p => p.uri))
}, [
store,
store.me.savedFeeds.pinned,
customFeeds,
setCustomFeeds,
pagerRef,
requestedCustomFeeds,
setRequestedCustomFeeds,
])
useFocusEffect(
React.useCallback(() => {
store.shell.setMinimalShellMode(false)
store.shell.setIsDrawerSwipeDisabled(selectedPage > 0)
return () => {
store.shell.setIsDrawerSwipeDisabled(false)
}
}, [store, selectedPage]),
)
const onPageSelected = React.useCallback(
(index: number) => {
store.shell.setMinimalShellMode(false)
setSelectedPage(index)
store.shell.setIsDrawerSwipeDisabled(index > 0)
},
[store, setSelectedPage],
)
const onPressSelected = React.useCallback(() => {
store.emitScreenSoftReset()
}, [store])
const renderTabBar = React.useCallback(
(props: RenderTabBarFnProps) => {
return (
<FeedsTabBar
key="FEEDS_TAB_BAR"
selectedPage={props.selectedPage}
onSelect={props.onSelect}
testID="homeScreenFeedTabs"
onPressSelected={onPressSelected}
/>
)
},
[onPressSelected],
)
const renderFollowingEmptyState = React.useCallback(() => {
return <FollowingEmptyState />
}, [])
const renderCustomFeedEmptyState = React.useCallback(() => {
return <CustomFeedEmptyState />
}, [])
return (
<Pager
ref={pagerRef}
testID="homeScreen"
onPageSelected={onPageSelected}
renderTabBar={renderTabBar}
tabBarPosition="top">
<FeedPage
key="1"
testID="followingFeedPage"
isPageFocused={selectedPage === 0}
feed={store.me.mainFeed}
renderEmptyState={renderFollowingEmptyState}
renderEndOfFeed={FollowingEndOfFeed}
/>
{customFeeds.map((f, index) => {
return (
<FeedPage
key={(f.params as GetCustomFeed.QueryParams).feed}
testID="customFeedPage"
isPageFocused={selectedPage === 1 + index}
feed={f}
renderEmptyState={renderCustomFeedEmptyState}
/>
)
})}
</Pager>
)
}),
)
export function useHeaderOffset() {
const {isDesktop, isTablet} = useWebMediaQueries()
const {fontScale} = useWindowDimensions()
if (isDesktop) {
return 0
}
if (isTablet) {
return 50
}
// default text takes 44px, plus 34px of pad
// scale the 44px by the font scale
return 34 + 44 * fontScale
}
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