From eccbf8bb6166fe6c388cce76b04d71acb49d3e94 Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Mon, 13 Apr 2026 23:51:33 +0200
Subject: [PATCH] Add presence validation and update NPC entity creation logic
 in App.tsx

---
 src/app/App.tsx | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/app/App.tsx b/src/app/App.tsx
index fa0bf2f1..f30bd0b5 100644
--- a/src/app/App.tsx
+++ b/src/app/App.tsx
@@ -5668,10 +5668,38 @@ export function App({ store, initialStatusMessage }: AppProps) {
     try {
       const trimmedModelAssetId = npcModelAssetIdDraft.trim();
       const colliderMode = overrides.colliderMode ?? npcColliderModeDraft;
+      const presence =
+        npcPresenceModeDraft === "always"
+          ? createNpcAlwaysPresence()
+          : createNpcTimeWindowPresence({
+              startHour: normalizeTimeOfDayHours(
+                readFiniteNumberDraft(
+                  npcPresenceStartHourDraft,
+                  "NPC presence start hour"
+                )
+              ),
+              endHour: normalizeTimeOfDayHours(
+                readFiniteNumberDraft(
+                  npcPresenceEndHourDraft,
+                  "NPC presence end hour"
+                )
+              )
+            });
+
+      if (
+        presence.mode === "timeWindow" &&
+        presence.startHour === presence.endHour
+      ) {
+        throw new Error(
+          "NPC presence window start and end hours must differ."
+        );
+      }
+
       const nextEntity = createNpcEntity({
         id: selectedNpc.id,
         name: selectedNpc.name,
         actorId: npcActorIdDraft,
+        presence,
         position: snapVec3ToGrid(
           readVec3Draft(entityPositionDraft, "NPC position"),
           DEFAULT_GRID_SIZE