Handle home algo with backwards compat

src/lib/constants.ts

@@ -89,3 +89,6 @@ export const BSKY_FEED_OWNER_DIDS = [
   'did:plc:vpkhqolt662uhesyj6nxm7ys',
   'did:plc:q6gjnaw2blty4crticxkmujt',
 ]
+
+export const DISCOVER_FEED_URI =
+  'at://did:plc:z72i7hdynmk6r22z27h6tvur/app.bsky.feed.generator/whats-hot'

src/lib/statsig/gates.ts

@@ -8,5 +8,5 @@ export type Gate =
   | 'new_search'
   | 'receive_updates'
   | 'show_follow_back_label'
-  | 'start_session_with_following'
   | 'use_new_suggestions_endpoint'
+  | 'reduced_onboarding_and_home_algo'

src/state/queries/feed.ts

@@ -13,6 +13,8 @@ import {
   useQuery,
 } from '@tanstack/react-query'
 
+import {DISCOVER_FEED_URI} from '#/lib/constants'
+import {useGate} from '#/lib/statsig/statsig'
 import {sanitizeDisplayName} from '#/lib/strings/display-names'
 import {sanitizeHandle} from '#/lib/strings/handles'
 import {STALE} from '#/state/queries'
@@ -199,10 +201,13 @@ export function useSearchPopularFeedsMutation() {
   })
 }
 
-const FOLLOWING_FEED_STUB: FeedSourceInfo = {
+/**
+ * The following feed, with fallbacks to Discover
+ */
+const HOME_FEED_STUB: FeedSourceInfo = {
   type: 'feed',
   displayName: 'Following',
-  uri: '',
+  uri: 'home',
   route: {
     href: '/',
     name: 'Home',
@@ -219,7 +224,24 @@ const FOLLOWING_FEED_STUB: FeedSourceInfo = {
 const DISCOVER_FEED_STUB: FeedSourceInfo = {
   type: 'feed',
   displayName: 'Discover',
-  uri: '',
+  uri: DISCOVER_FEED_URI, // TODO may not want this
+  route: {
+    href: '/',
+    name: 'Home',
+    params: {},
+  },
+  cid: '',
+  avatar: '',
+  description: new RichText({text: ''}),
+  creatorDid: '',
+  creatorHandle: '',
+  likeCount: 0,
+  likeUri: '',
+}
+const HOME_ALGO_FEED_STUB: FeedSourceInfo = {
+  type: 'feed',
+  displayName: 'Home',
+  uri: 'home-algo',
   route: {
     href: '/',
     name: 'Home',
@@ -239,7 +261,17 @@ const pinnedFeedInfosQueryKeyRoot = 'pinnedFeedsInfos'
 export function usePinnedFeedsInfos() {
   const {hasSession} = useSession()
   const {data: preferences, isLoading: isLoadingPrefs} = usePreferencesQuery()
-  const pinnedUris = preferences?.feeds?.pinned ?? []
+  const isHomeAlgoExperimentEnabled = useGate(
+    'reduced_onboarding_and_home_algo',
+  )
+  const homeAlgo = preferences?.homeAlgo
+  const pinnedUris = (preferences?.feeds?.pinned ?? []).filter(f => {
+    if (isHomeAlgoExperimentEnabled && hasSession && homeAlgo) {
+      // remove duplicate feed
+      return f !== homeAlgo.uri
+    }
+    return true
+  })
 
   return useQuery({
     staleTime: STALE.INFINITY,
@@ -285,7 +317,15 @@ export function usePinnedFeedsInfos() {
       )
 
       // The returned result will have the original order.
-      const result = [hasSession ? FOLLOWING_FEED_STUB : DISCOVER_FEED_STUB]
+      let result = [hasSession ? HOME_FEED_STUB : DISCOVER_FEED_STUB]
+
+      if (isHomeAlgoExperimentEnabled && hasSession && preferences?.homeAlgo) {
+        const {enabled, uri} = preferences.homeAlgo
+        if (enabled && uri) {
+          result = [HOME_ALGO_FEED_STUB, HOME_FEED_STUB]
+        }
+      }
+
       await Promise.allSettled([feedsPromise, ...listsPromises])
       for (let pinnedUri of pinnedUris) {
         if (resolved.has(pinnedUri)) {

src/state/queries/post-feed.ts

@@ -44,6 +44,7 @@ type AuthorFilter =
 type FeedUri = string
 type ListUri = string
 export type FeedDescriptor =
+  | 'home-algo'
   | 'home'
   | 'following'
   | `author|${ActorDid}|${AuthorFilter}`

src/state/queries/preferences/const.ts

@@ -1,8 +1,8 @@
-import {
-  UsePreferencesQueryResponse,
-  ThreadViewPreferences,
-} from '#/state/queries/preferences/types'
 import {DEFAULT_LOGGED_OUT_LABEL_PREFERENCES} from '#/state/queries/preferences/moderation'
+import {
+  ThreadViewPreferences,
+  UsePreferencesQueryResponse,
+} from '#/state/queries/preferences/types'
 
 export const DEFAULT_HOME_FEED_PREFS: UsePreferencesQueryResponse['feedViewPrefs'] =
   {
@@ -45,4 +45,5 @@ export const DEFAULT_LOGGED_OUT_PREFERENCES: UsePreferencesQueryResponse = {
   threadViewPrefs: DEFAULT_THREAD_VIEW_PREFS,
   userAge: 13, // TODO(pwi)
   interests: {tags: []},
+  homeAlgo: {enabled: undefined},
 }

src/view/com/home/HomeHeader.tsx

@@ -1,12 +1,13 @@
 import React from 'react'
-import {RenderTabBarFnProps} from 'view/com/pager/Pager'
-import {HomeHeaderLayout} from './HomeHeaderLayout'
-import {FeedSourceInfo} from '#/state/queries/feed'
 import {useNavigation} from '@react-navigation/native'
+
+import {usePalette} from '#/lib/hooks/usePalette'
+import {FeedSourceInfo} from '#/state/queries/feed'
 import {NavigationProp} from 'lib/routes/types'
 import {isWeb} from 'platform/detection'
+import {RenderTabBarFnProps} from 'view/com/pager/Pager'
 import {TabBar} from '../pager/TabBar'
-import {usePalette} from '#/lib/hooks/usePalette'
+import {HomeHeaderLayout} from './HomeHeaderLayout'
 
 export function HomeHeader(
   props: RenderTabBarFnProps & {
@@ -20,7 +21,9 @@ export function HomeHeader(
   const pal = usePalette('default')
 
   const hasPinnedCustom = React.useMemo<boolean>(() => {
-    return feeds.some(tab => tab.uri !== '')
+    return feeds.some(
+      tab => !['home', 'home-algo', 'following'].includes(tab.uri),
+    )
   }, [feeds])
 
   const items = React.useMemo(() => {

src/view/screens/Home.tsx

@@ -53,19 +53,34 @@ function HomeScreenReady({
   pinnedFeedInfos: FeedSourceInfo[]
 }) {
   useOTAUpdates()
+  const isHomeAlgoExperimentEnabled = useGate(
+    'reduced_onboarding_and_home_algo',
+  )
 
   const allFeeds = React.useMemo(() => {
     const feeds: FeedDescriptor[] = []
-    feeds.push('home')
     for (const {uri} of pinnedFeedInfos) {
       if (uri.includes('app.bsky.feed.generator')) {
         feeds.push(`feedgen|${uri}`)
       } else if (uri.includes('app.bsky.graph.list')) {
         feeds.push(`list|${uri}`)
+      } else if (uri === 'home-algo') {
+        // TODO can I ever end up here without a feed?
+        if (
+          isHomeAlgoExperimentEnabled &&
+          preferences.homeAlgo.enabled &&
+          preferences.homeAlgo.uri
+        ) {
+          feeds.push(`feedgen|${preferences.homeAlgo.uri}`)
+        }
+      } else if (uri === 'home') {
+        feeds.push('home')
+      } else if (uri === 'following') {
+        feeds.push('following')
       }
     }
     return feeds
-  }, [pinnedFeedInfos])
+  }, [pinnedFeedInfos, isHomeAlgoExperimentEnabled, preferences.homeAlgo])
 
   const rawSelectedFeed = useSelectedFeed()
   const setSelectedFeed = useSetSelectedFeed()
@@ -186,7 +201,6 @@ function HomeScreenReady({
     return <CustomFeedEmptyState />
   }, [])
 
-  const [homeFeed, ...customFeeds] = allFeeds
   const homeFeedParams = React.useMemo<FeedParams>(() => {
     return {
       mergeFeedEnabled: Boolean(preferences.feedViewPrefs.lab_mergeFeedEnabled),
@@ -206,16 +220,21 @@ function HomeScreenReady({
       onPageSelected={onPageSelected}
       onPageScrollStateChanged={onPageScrollStateChanged}
       renderTabBar={renderTabBar}>
-      <FeedPage
-        key={homeFeed}
-        testID="followingFeedPage"
-        isPageFocused={selectedFeed === homeFeed}
-        feed={homeFeed}
-        feedParams={homeFeedParams}
-        renderEmptyState={renderFollowingEmptyState}
-        renderEndOfFeed={FollowingEndOfFeed}
-      />
-      {customFeeds.map(feed => {
+      {allFeeds.map(feed => {
+        if (feed === 'home') {
+          return (
+            <FeedPage
+              key={'home'}
+              testID="followingFeedPage"
+              isPageFocused={selectedFeed === 'home'}
+              feed={'home'}
+              feedParams={homeFeedParams}
+              renderEmptyState={renderFollowingEmptyState}
+              renderEndOfFeed={FollowingEndOfFeed}
+            />
+          )
+        }
+
         return (
           <FeedPage
             key={feed}

src/view/shell/desktop/Feeds.tsx

@@ -1,16 +1,17 @@
 import React from 'react'
-import {View, StyleSheet} from 'react-native'
-import {useNavigationState, useNavigation} from '@react-navigation/native'
-import {usePalette} from 'lib/hooks/usePalette'
-import {TextLink} from 'view/com/util/Link'
-import {getCurrentRoute} from 'lib/routes/helpers'
-import {useLingui} from '@lingui/react'
+import {StyleSheet, View} from 'react-native'
 import {msg} from '@lingui/macro'
-import {usePinnedFeedsInfos} from '#/state/queries/feed'
-import {useSelectedFeed, useSetSelectedFeed} from '#/state/shell/selected-feed'
-import {FeedDescriptor} from '#/state/queries/post-feed'
-import {NavigationProp} from 'lib/routes/types'
+import {useLingui} from '@lingui/react'
+import {useNavigation, useNavigationState} from '@react-navigation/native'
+
 import {emitSoftReset} from '#/state/events'
+import {usePinnedFeedsInfos} from '#/state/queries/feed'
+import {FeedDescriptor} from '#/state/queries/post-feed'
+import {useSelectedFeed, useSetSelectedFeed} from '#/state/shell/selected-feed'
+import {usePalette} from 'lib/hooks/usePalette'
+import {getCurrentRoute} from 'lib/routes/helpers'
+import {NavigationProp} from 'lib/routes/types'
+import {TextLink} from 'view/com/util/Link'
 
 export function DesktopFeeds() {
   const pal = usePalette('default')
@@ -33,8 +34,10 @@ export function DesktopFeeds() {
       {pinnedFeedInfos.map(feedInfo => {
         const uri = feedInfo.uri
         let feed: FeedDescriptor
-        if (!uri) {
+        if (uri === 'home') {
           feed = 'home'
+        } else if (uri === 'home-algo') {
+          feed = 'home-algo'
         } else if (uri.includes('app.bsky.feed.generator')) {
           feed = `feedgen|${uri}`
         } else if (uri.includes('app.bsky.graph.list')) {