progress restoring logic

src/components/video/controls/ProgressListenerControl.tsx

@@ -7,6 +7,25 @@ interface Props {
   onProgress?: (time: number, duration: number) => void;
 }
 
+const FIVETEEN_MINUTES = 15 * 60;
+const FIVE_MINUTES = 5 * 60;
+
+function shouldRestoreTime(time: number, duration: number): boolean {
+  const timeFromEnd = Math.max(0, duration - time);
+
+  // short movie
+  if (duration < FIVETEEN_MINUTES) {
+    if (time < 5) return false;
+    if (timeFromEnd < 60) return false;
+    return true;
+  }
+
+  // long movie
+  if (time < 30) return false;
+  if (timeFromEnd < FIVE_MINUTES) return false;
+  return true;
+}
+
 export function ProgressListenerControl(props: Props) {
   const { videoState } = useVideoPlayerState();
   const didInitialize = useRef<true | null>(null);
@@ -31,7 +50,12 @@ export function ProgressListenerControl(props: Props) {
   useEffect(() => {
     if (didInitialize.current) return;
     if (!videoState.hasInitialized || Number.isNaN(videoState.duration)) return;
-    if (props.startAt !== undefined) videoState.setTime(props.startAt);
+    if (
+      props.startAt !== undefined &&
+      shouldRestoreTime(props.startAt, videoState.duration)
+    ) {
+      videoState.setTime(props.startAt);
+    }
     didInitialize.current = true;
   }, [didInitialize, videoState, props]);