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diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -45,6 +45,7 @@
usersWithPersonalThreadSelector,
} from '../selectors/user-selectors.js';
import { getUserAvatarForThread } from '../shared/avatar-utils.js';
+import SentencePrefixSearchIndex from '../shared/sentence-prefix-search-index.js';
import type { CalendarQuery } from '../types/entry-types.js';
import { messageTypes } from '../types/message-types-enum.js';
import {
@@ -1855,6 +1856,50 @@
]);
}
+function useChatMentionSearchIndex(): {
+ +[id: string]: SentencePrefixSearchIndex,
+} {
+ const { chatMentionCandidatesObj } = useChatMentionCandidatesObjAndUtils();
+ return React.useMemo(() => {
+ const result = {};
+ for (const communityThreadID in chatMentionCandidatesObj) {
+ const searchIndex = new SentencePrefixSearchIndex();
+ const searchIndexEntries = [];
+ for (const threadID in chatMentionCandidatesObj[communityThreadID]) {
+ searchIndexEntries.push({
+ id: threadID,
+ uiName: chatMentionCandidatesObj[communityThreadID][threadID].uiName,
+ });
+ }
+ // Sort the keys so that the order of the search result is consistent
+ searchIndexEntries.sort(({ uiName: uiNameA }, { uiName: uiNameB }) =>
+ uiNameA.localeCompare(uiNameB),
+ );
+ for (const { id, uiName } of searchIndexEntries) {
+ searchIndex.addEntry(id, uiName);
+ }
+ result[communityThreadID] = searchIndex;
+ }
+ return result;
+ }, [chatMentionCandidatesObj]);
+}
+
+function useThreadChatMentionSearchIndex(
+ threadInfo: ThreadInfo,
+): SentencePrefixSearchIndex {
+ const chatMentionCandidatesSearchIndex = useChatMentionSearchIndex();
+ const { communityThreadIDForGenesisThreads } =
+ useChatMentionCandidatesObjAndUtils();
+ if (threadInfo.community === genesis.id) {
+ return chatMentionCandidatesSearchIndex[
+ communityThreadIDForGenesisThreads[threadInfo.id]
+ ];
+ }
+ return chatMentionCandidatesSearchIndex[
+ threadInfo.community ?? threadInfo.id
+ ];
+}
+
export {
threadHasPermission,
viewerIsMember,
@@ -1925,4 +1970,5 @@
useChatMentionCandidatesObj,
useThreadChatMentionCandidates,
useUserProfileThreadInfo,
+ useThreadChatMentionSearchIndex,
};

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