Fix up traversal metadata

src/state/queries/usePostThread/utils.ts

@@ -2,10 +2,11 @@ import {
   type AppBskyFeedDefs,
   AppBskyFeedPost,
   AppBskyFeedThreadgate,
-  type AppBskyUnspeccedGetPostThreadV2,
+  AppBskyUnspeccedGetPostThreadV2,
   AtUri,
 } from '@atproto/api'
 
+import {type TraversalMetadata} from '#/state/queries/usePostThread/types'
 import * as bsky from '#/types/bsky'
 
 export function getThreadgateRecord(
@@ -31,3 +32,25 @@ export function getRootPostAtUri(post: AppBskyFeedDefs.PostView) {
     }
   }
 }
+
+export function getPostRecord(post: AppBskyFeedDefs.PostView) {
+  return post.record as AppBskyFeedPost.Record
+}
+
+export function getPostTraversalMetadata(
+  item: AppBskyUnspeccedGetPostThreadV2.ThreadItem,
+): TraversalMetadata | undefined {
+  if (!AppBskyUnspeccedGetPostThreadV2.isThreadItemPost(item.value)) return
+  const replyCount = item.value.post.replyCount || 0
+  const unhydratedReplies = item.value.moreReplies || 0
+  return {
+    depth: item.depth,
+    /**
+     * If the post has more than a single reply, and the total reply count
+     * minus the number of replies not present in the response is greater than
+     * 1, then we must have more than a single branch of replies present in the
+     * response, which can affect how we render tree view.
+     */
+    hasBranchingReplies: replyCount > 1 && replyCount - unhydratedReplies > 1,
+  }
+}