From 4cc37809ddaa7870713dcfd1a42b2639d3ccf4aa Mon Sep 17 00:00:00 2001
From: Interzoneism <113020222+Interzoneism@users.noreply.github.com>
Date: Thu, 2 Oct 2025 23:06:22 +0200
Subject: [PATCH] Cache empty craftable scans

---
 ShowCraftable/ShowCraftable/ShowCraftableModSystem.cs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ShowCraftable/ShowCraftable/ShowCraftableModSystem.cs b/ShowCraftable/ShowCraftable/ShowCraftableModSystem.cs
index 99f31639..ed923091 100644
--- a/ShowCraftable/ShowCraftable/ShowCraftableModSystem.cs
+++ b/ShowCraftable/ShowCraftable/ShowCraftableModSystem.cs
@@ -67,6 +67,7 @@ public class ShowCraftableSystem : ModSystem
         private static List<string> s_EmptyPages;
         private static List<string> StoneTypeTabCache = new();
         private static List<string> WoodTypeTabCache = new();
+        private static readonly Dictionary<string, bool> TabCachePrimed = new(StringComparer.Ordinal);
         private static List<WildGroup> wildcardGroups = new();
         private static readonly Dictionary<int, ScanRequestInfo> InflightById = new();
         private static readonly Dictionary<string, bool> TabReadyToUpdateUi = new(StringComparer.Ordinal);
@@ -564,6 +565,8 @@ private static void SetTabCache(string tabKey, IEnumerable<string> pages)
             else if (string.Equals(tabKey, WoodTabKeyName, StringComparison.Ordinal)) WoodTypeTabCache = list;
             else if (string.Equals(tabKey, StoneTabKeyName, StringComparison.Ordinal)) StoneTypeTabCache = list;
             else CraftableTabCache = list;
+
+            TabCachePrimed[tabKey] = true;
         }
 
         private static List<string> GetTabCacheSnapshot(string tabKey)
@@ -2572,6 +2575,7 @@ private static void ClearAllCaches()
                 StoneTypeTabCache = new List<string>();
                 WoodTypeTabCache = new List<string>();
                 s_EmptyPages = null;
+                TabCachePrimed.Clear();
             }
 
             recipeGroupNeeds = new Dictionary<GridRecipeShim, Dictionary<string, int>>();
@@ -4145,14 +4149,16 @@ private void OnServerScanReply(CraftScanReply data)
                 }
 
                 int cachedPages;
+                bool cachePrimed;
                 lock (CacheLock)
                 {
                     var cache = GetTabCache(tabKey);
                     cachedPages = cache?.Count ?? 0;
+                    cachePrimed = TabCachePrimed.TryGetValue(tabKey, out var primed) && primed;
                 }
                 bool cacheEmpty = cachedPages == 0;
 
-                if (dnaMatch && !cacheEmpty)
+                if (dnaMatch && (cachePrimed || !cacheEmpty))
                 {
                     SetTabReadyToUpdateUI(tabKey, true);
                     _capi.Event.EnqueueMainThreadTask(() =>