From c4bbe0d0001f03bca97b966b1c6610ec29c9c27b Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Wed, 19 Nov 2025 03:44:37 +0000
Subject: [PATCH] Changes

---
 src/components/PresentsPuzzle.tsx | 90 ++++++++++++++++++-------------
 1 file changed, 52 insertions(+), 38 deletions(-)

diff --git a/src/components/PresentsPuzzle.tsx b/src/components/PresentsPuzzle.tsx
index 56dea60..024b35c 100644
--- a/src/components/PresentsPuzzle.tsx
+++ b/src/components/PresentsPuzzle.tsx
@@ -141,11 +141,6 @@ const PresentsPuzzle = ({
       setIsRunning(true);
       isPausedRef.current = false;
       setWinner(null);
-      setAliceOpened(new Set());
-      setBobOpened(new Set());
-      setAliceFound(0);
-      setBobFound(0);
-      setCurrentStep(0);
       const presents = generatePresents();
       setPresentBoxes(presents);
       const newAliceOrder = getAliceOrder();
@@ -153,36 +148,49 @@ const PresentsPuzzle = ({
       setAliceOrder(newAliceOrder);
       setBobOrder(newBobOrder);
       
+      // Initialize with empty state
+      setAliceOpened(new Set());
+      setBobOpened(new Set());
+      setAliceFound(0);
+      setBobFound(0);
+      setCurrentStep(-1); // -1 means no boxes opened yet
+      
       // Start animation from beginning
       let aliceCount = 0;
       let bobCount = 0;
       let currentWinner: 'alice' | 'bob' | 'tie' | null = null;
       
       for (let i = 0; i < 100 && !currentWinner; i++) {
+        await new Promise(resolve => setTimeout(resolve, 50));
+        
+        // Check pause after delay, before opening boxes
         if (isPausedRef.current) {
-          setCurrentStep(i);
           setIsRunning(false);
           return;
         }
         
-        await new Promise(resolve => setTimeout(resolve, 50));
-        
         const aliceBox = newAliceOrder[i];
         const bobBox = newBobOrder[i];
-        setAliceOpened(prev => new Set(prev).add(aliceBox));
-        setBobOpened(prev => new Set(prev).add(bobBox));
-        setCurrentStep(i);
+        
+        // Create new sets with the new boxes (ensures synchronous update)
+        const newAliceOpened = new Set<number>();
+        const newBobOpened = new Set<number>();
+        for (let j = 0; j <= i; j++) {
+          newAliceOpened.add(newAliceOrder[j]);
+          newBobOpened.add(newBobOrder[j]);
+        }
         
         const aliceFoundPresent = presents.has(aliceBox);
         const bobFoundPresent = presents.has(bobBox);
-        if (aliceFoundPresent) {
-          aliceCount++;
-          setAliceFound(aliceCount);
-        }
-        if (bobFoundPresent) {
-          bobCount++;
-          setBobFound(bobCount);
-        }
+        if (aliceFoundPresent) aliceCount++;
+        if (bobFoundPresent) bobCount++;
+        
+        // Update all state together for perfect sync
+        setAliceOpened(newAliceOpened);
+        setBobOpened(newBobOpened);
+        setAliceFound(aliceCount);
+        setBobFound(bobCount);
+        setCurrentStep(i);
 
         if (aliceCount === 26 && bobCount === 26) {
           currentWinner = 'tie';
@@ -204,30 +212,36 @@ const PresentsPuzzle = ({
       let currentWinner: 'alice' | 'bob' | 'tie' | null = winner;
       
       for (let i = currentStep + 1; i < 100 && !currentWinner; i++) {
+        await new Promise(resolve => setTimeout(resolve, 50));
+        
+        // Check pause after delay, before opening boxes
         if (isPausedRef.current) {
-          setCurrentStep(i);
           setIsRunning(false);
           return;
         }
         
-        await new Promise(resolve => setTimeout(resolve, 50));
-        
         const aliceBox = aliceOrder[i];
         const bobBox = bobOrder[i];
-        setAliceOpened(prev => new Set(prev).add(aliceBox));
-        setBobOpened(prev => new Set(prev).add(bobBox));
-        setCurrentStep(i);
+        
+        // Create new sets with the new boxes
+        const newAliceOpened = new Set<number>();
+        const newBobOpened = new Set<number>();
+        for (let j = 0; j <= i; j++) {
+          newAliceOpened.add(aliceOrder[j]);
+          newBobOpened.add(bobOrder[j]);
+        }
         
         const aliceFoundPresent = presentBoxes.has(aliceBox);
         const bobFoundPresent = presentBoxes.has(bobBox);
-        if (aliceFoundPresent) {
-          aliceCount++;
-          setAliceFound(aliceCount);
-        }
-        if (bobFoundPresent) {
-          bobCount++;
-          setBobFound(bobCount);
-        }
+        if (aliceFoundPresent) aliceCount++;
+        if (bobFoundPresent) bobCount++;
+        
+        // Update all state together for perfect sync
+        setAliceOpened(newAliceOpened);
+        setBobOpened(newBobOpened);
+        setAliceFound(aliceCount);
+        setBobFound(bobCount);
+        setCurrentStep(i);
 
         if (aliceCount === 26 && bobCount === 26) {
           currentWinner = 'tie';
@@ -268,7 +282,7 @@ const PresentsPuzzle = ({
     setBobOpened(new Set());
     setAliceFound(0);
     setBobFound(0);
-    setCurrentStep(0);
+    setCurrentStep(-1); // -1 means no boxes opened yet
     setWinner(null);
   };
 
@@ -282,7 +296,7 @@ const PresentsPuzzle = ({
     setWinner(null);
     setIsRunning(false);
     isPausedRef.current = false;
-    setCurrentStep(0);
+    setCurrentStep(-1); // -1 means not initialized
     setAliceOrder([]);
     setBobOrder([]);
   };
@@ -392,7 +406,7 @@ const PresentsPuzzle = ({
               className="gap-2"
             >
               <Play className="w-4 h-4" />
-              {currentStep === 0 ? 'Start' : 'Resume'}
+              {currentStep === -1 ? 'Start' : 'Resume'}
             </Button>
             <Button 
               onClick={pauseSimulation} 
@@ -405,7 +419,7 @@ const PresentsPuzzle = ({
             </Button>
             <Button 
               onClick={stepToStart} 
-              disabled={isRunning || currentStep === 0} 
+              disabled={isRunning || currentStep <= -1} 
               variant="outline"
               className="gap-2"
               title="Step to start"
@@ -414,7 +428,7 @@ const PresentsPuzzle = ({
             </Button>
             <Button 
               onClick={stepBack} 
-              disabled={isRunning || currentStep === 0} 
+              disabled={isRunning || currentStep <= -1} 
               variant="outline"
               className="gap-2"
               title="Step back"