From 41dff749202c7c11eb6d74ed57f69a78cc61ca2b Mon Sep 17 00:00:00 2001
From: Jakub Kosmydel <104823336+kosmydel@users.noreply.github.com>
Date: Fri, 5 Jul 2024 16:12:44 +0200
Subject: [PATCH] Ad2: Calculate useLastAccessedReportID only when needed

---
 src/hooks/useLastAccessedReportID.ts | 14 +++++++++-----
 src/libs/ReportUtils.ts              | 11 ++++++++---
 src/pages/home/ReportScreen.tsx      |  6 +++++-
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/src/hooks/useLastAccessedReportID.ts b/src/hooks/useLastAccessedReportID.ts
index 16a4a6bc2a31..dda3460210de 100644
--- a/src/hooks/useLastAccessedReportID.ts
+++ b/src/hooks/useLastAccessedReportID.ts
@@ -124,13 +124,16 @@ function addSubscriber(subscriber: () => void) {
 /**
  * Get the last accessed reportID.
  */
-export default function useLastAccessedReportID(shouldOpenOnAdminRoom: boolean) {
+export default function useLastAccessedReportID(shouldOpenOnAdminRoom: boolean, shouldRun: boolean) {
     const {canUseDefaultRooms} = usePermissions();
     const {activeWorkspaceID} = useActiveWorkspace();
-
     const getSnapshot = useCallback(() => {
+        if (!shouldRun) {
+            return undefined;
+        }
         const policyMemberAccountIDs = getPolicyEmployeeListByIdWithoutCurrentUser(policies, activeWorkspaceID, accountID);
-        return ReportUtils.findLastAccessedReport(
+        console.time('findLastAccessedReport');
+        const res = ReportUtils.findLastAccessedReport(
             reports,
             !canUseDefaultRooms,
             policies,
@@ -140,8 +143,9 @@ export default function useLastAccessedReportID(shouldOpenOnAdminRoom: boolean)
             activeWorkspaceID,
             policyMemberAccountIDs,
         )?.reportID;
-    }, [activeWorkspaceID, canUseDefaultRooms, shouldOpenOnAdminRoom]);
-
+        console.timeEnd('findLastAccessedReport');
+        return res;
+    }, [activeWorkspaceID, canUseDefaultRooms, shouldOpenOnAdminRoom, shouldRun]);
     // We need access to all the data from these Onyx.connect calls, but we don't want to re-render the consuming component
     // unless the derived value (lastAccessedReportID) changes. To address these, we'll wrap everything with useSyncExternalStore
     return useSyncExternalStore(addSubscriber, getSnapshot);
diff --git a/src/libs/ReportUtils.ts b/src/libs/ReportUtils.ts
index 0b0b42b72336..e0c9a45fd1d3 100644
--- a/src/libs/ReportUtils.ts
+++ b/src/libs/ReportUtils.ts
@@ -1183,13 +1183,17 @@ function findLastAccessedReport(
         reportsValues = filterReportsByPolicyIDAndMemberAccountIDs(reportsValues, policyMemberAccountIDs, policyID);
     }
 
-    console.time('findLastAccessedReport');
+    console.time('sortReportsByLastRead');
+
+    // OLD SOLUTION
+    // let sortedReports = sortReportsByLastRead(reportsValues, reportMetadata);
+
+    // NEW SOLUTION
     let sortedReports = reportsValues.filter(
         (report) => !!report?.reportID && !!(reportMetadata?.[`${ONYXKEYS.COLLECTION.REPORT_METADATA}${report.reportID}`]?.lastVisitTime ?? report?.lastReadTime),
     );
-    console.time('findLastAccessedReport');
-
     const lastRead = lodashMaxBy(sortedReports, (a) => new Date(reportMetadata?.[`${ONYXKEYS.COLLECTION.REPORT_METADATA}${a?.reportID}`]?.lastVisitTime ?? a?.lastReadTime ?? '').valueOf());
+    console.timeEnd('sortReportsByLastRead');
 
     let adminReport: OnyxEntry<Report>;
     if (openOnAdminRoom) {
@@ -1241,6 +1245,7 @@ function findLastAccessedReport(
     }
 
     return adminReport ?? lastRead;
+    // return adminReport ?? sortedReports.at(-1);
 }
 
 /**
diff --git a/src/pages/home/ReportScreen.tsx b/src/pages/home/ReportScreen.tsx
index 539b46aa5b06..dda7be4c692a 100644
--- a/src/pages/home/ReportScreen.tsx
+++ b/src/pages/home/ReportScreen.tsx
@@ -138,6 +138,7 @@ function ReportScreen({
     currentReportID = '',
     navigation,
 }: ReportScreenProps) {
+    console.time('ReportScreen - render');
     const styles = useThemeStyles();
     const {translate} = useLocalize();
     const reportIDFromRoute = getReportID(route);
@@ -170,7 +171,8 @@ function ReportScreen({
     const permissions = useDeepCompareRef(reportOnyx?.permissions);
 
     // Check if there's a reportID in the route. If not, set it to the last accessed reportID
-    const lastAccessedReportID = useLastAccessedReportID(!!route.params.openOnAdminRoom);
+    const lastAccessedReportID = useLastAccessedReportID(!!route.params.openOnAdminRoom, !route.params.reportID);
+
     useEffect(() => {
         // Don't update if there is a reportID in the params already
         if (route.params.reportID) {
@@ -734,6 +736,8 @@ function ReportScreen({
         );
     }
 
+    console.timeEnd('ReportScreen - render');
+
     return (
         <ActionListContext.Provider value={actionListValue}>
             <ReactionListContext.Provider value={reactionListRef}>