From cec2438f6a9c75a8a1dda1f52d813343d53db82a Mon Sep 17 00:00:00 2001
From: Samuel Newman <10959775+mozzius@users.noreply.github.com>
Date: Thu, 4 Jul 2024 19:57:09 +0100
Subject: [PATCH] click to steal active video

---
 .../util/post-embeds/ActiveVideoContext.tsx   | 36 +++++++++++++++++--
 src/view/com/util/post-embeds/VideoEmbed.tsx  |  6 +++-
 .../com/util/post-embeds/VideoEmbed.web.tsx   |  6 +++-
 .../com/util/post-embeds/VideoEmbedInner.tsx  |  6 +++-
 .../util/post-embeds/VideoEmbedInner.web.tsx  | 30 ++++++++++++++--
 5 files changed, 77 insertions(+), 7 deletions(-)

diff --git a/src/view/com/util/post-embeds/ActiveVideoContext.tsx b/src/view/com/util/post-embeds/ActiveVideoContext.tsx
index 212b1bcd57..ddf4fa6615 100644
--- a/src/view/com/util/post-embeds/ActiveVideoContext.tsx
+++ b/src/view/com/util/post-embeds/ActiveVideoContext.tsx
@@ -22,6 +22,7 @@ const ActiveVideoContext = React.createContext<{
 export function ActiveVideoProvider({children}: {children: React.ReactNode}) {
   const [activeViewId, setActiveViewId] = useState<string | null>(null)
   const [source, setSource] = useState<string | null>(null)
+  const [manuallySet, setManuallySet] = useState(false)
   const {height: windowHeight} = useWindowDimensions()
 
   const measurementCallbacks = useRef<Record<string, () => DOMRect | void>>({})
@@ -46,7 +47,37 @@ export function ActiveVideoProvider({children}: {children: React.ReactNode}) {
       const active = closestToMiddle(windowHeight, videosInView)
 
       if (active) {
-        setActiveViewId(active.id)
+        // change the active view if it's not already active
+        // if the user has manually set the active view, don't change it
+        // i.e. if the user clicks on a video at the bottom of the screen
+        // it takes precidence over the video that is closest to the middle
+        setActiveViewId(activeView => {
+          if (activeView !== active.id) {
+            if (manuallySet && videosInView.find(({id}) => id === activeView)) {
+              return activeView
+            }
+            setManuallySet(false)
+            return active.id
+          }
+          return activeView
+        })
+      } else {
+        // if no videos are in view, unset the active view
+        // if the active view is partially in view, keep it active
+        setActiveViewId(activeView => {
+          const activeRect = locations.find(({id}) => id === activeView)?.rect
+
+          if (activeRect) {
+            const topCond = activeRect.top + activeRect.height / 2 >= 0
+            const bottomCond =
+              activeRect.bottom - activeRect.height / 2 <= windowHeight
+            if (topCond && bottomCond) {
+              return activeView
+            }
+          }
+
+          return null
+        })
       }
     }
     findAndActivateVideo()
@@ -55,7 +86,7 @@ export function ActiveVideoProvider({children}: {children: React.ReactNode}) {
     return () => {
       clearInterval(interval)
     }
-  }, [activeViewId, windowHeight])
+  }, [manuallySet, windowHeight])
 
   const value = useMemo(
     () => ({
@@ -63,6 +94,7 @@ export function ActiveVideoProvider({children}: {children: React.ReactNode}) {
       setActiveView: (viewId: string, src: string) => {
         setActiveViewId(viewId)
         setSource(src)
+        setManuallySet(true)
       },
       registerMeasurementCallback: (viewId: string, callback: () => void) => {
         measurementCallbacks.current[viewId] = callback
diff --git a/src/view/com/util/post-embeds/VideoEmbed.tsx b/src/view/com/util/post-embeds/VideoEmbed.tsx
index 44be475543..884fd38dfa 100644
--- a/src/view/com/util/post-embeds/VideoEmbed.tsx
+++ b/src/view/com/util/post-embeds/VideoEmbed.tsx
@@ -27,7 +27,11 @@ export function VideoEmbed({source}: {source: string}) {
         a.my_xs,
       ]}>
       {active ? (
-        <VideoEmbedInner source={source} active={active} />
+        <VideoEmbedInner
+          source={source}
+          active={active}
+          setActive={setActive}
+        />
       ) : (
         <Button
           style={[a.flex_1, t.atoms.bg_contrast_25]}
diff --git a/src/view/com/util/post-embeds/VideoEmbed.web.tsx b/src/view/com/util/post-embeds/VideoEmbed.web.tsx
index 58bb9b23ee..f8f965cd81 100644
--- a/src/view/com/util/post-embeds/VideoEmbed.web.tsx
+++ b/src/view/com/util/post-embeds/VideoEmbed.web.tsx
@@ -43,7 +43,11 @@ export function VideoEmbed({source}: {source: string}) {
       ]}>
       <div ref={ref} style={{display: 'flex', flex: 1}}>
         {hasBeenActive ? (
-          <VideoEmbedInner source={source} active={active} />
+          <VideoEmbedInner
+            source={source}
+            active={active}
+            setActive={setActive}
+          />
         ) : (
           <Button
             style={[a.flex_1, t.atoms.bg_contrast_25]}
diff --git a/src/view/com/util/post-embeds/VideoEmbedInner.tsx b/src/view/com/util/post-embeds/VideoEmbedInner.tsx
index 07d111d1ba..a04da42799 100644
--- a/src/view/com/util/post-embeds/VideoEmbedInner.tsx
+++ b/src/view/com/util/post-embeds/VideoEmbedInner.tsx
@@ -13,7 +13,11 @@ import {atoms as a} from '#/alf'
 import {Text} from '#/components/Typography'
 import {useVideoPlayer} from './VideoPlayerContext'
 
-export function VideoEmbedInner({}: {source: string; active: boolean}) {
+export function VideoEmbedInner({}: {
+  source: string
+  active: boolean
+  setActive: () => void
+}) {
   const player = useVideoPlayer()
   const aref = useAnimatedRef<Animated.View>()
   const {height: windowHeight} = useWindowDimensions()
diff --git a/src/view/com/util/post-embeds/VideoEmbedInner.web.tsx b/src/view/com/util/post-embeds/VideoEmbedInner.web.tsx
index 05c45af74d..c9fc6fa9e7 100644
--- a/src/view/com/util/post-embeds/VideoEmbedInner.web.tsx
+++ b/src/view/com/util/post-embeds/VideoEmbedInner.web.tsx
@@ -7,12 +7,15 @@ import {atoms as a, useTheme} from '#/alf'
 export function VideoEmbedInner({
   source,
   active,
+  setActive,
 }: {
   source: string
   active: boolean
+  setActive: () => void
 }) {
   const [hls] = useState(() => new Hls())
   const ref = useRef<HTMLVideoElement>(null)
+  const [focused, setFocused] = useState(false)
   const t = useTheme()
 
   useEffect(() => {
@@ -38,6 +41,15 @@ export function VideoEmbedInner({
     }
   }, [source, hls])
 
+  useEffect(() => {
+    if (active) {
+      ref.current?.play()
+    } else {
+      ref.current?.pause()
+      setFocused(false)
+    }
+  }, [active])
+
   return (
     <View
       style={[
@@ -55,8 +67,22 @@ export function VideoEmbedInner({
         playsInline
         preload="none"
         loop
-        muted
-        autoPlay={active}
+        muted={!focused}
+        onClick={evt => {
+          evt.stopPropagation()
+          if (focused) {
+            if (ref.current?.paused) {
+              ref.current.play()
+            } else {
+              ref.current?.pause()
+            }
+          } else {
+            if (!active) {
+              setActive()
+            }
+            setFocused(true)
+          }
+        }}
       />
     </View>
   )