working on levels

src/game.css

@@ -99,6 +99,33 @@
   border-radius: 2px 6px 6px 2px;
 }
 
+/* =========================================================
+   Collision Effect
+   ========================================================= */
+.snake-cell.collision {
+  background-color: var(--destructive, #c53b53) !important;
+  box-shadow: 
+    0 0 12px color-mix(in srgb, var(--destructive, #c53b53) 90%, transparent),
+    0 0 24px color-mix(in srgb, var(--destructive, #c53b53) 60%, transparent),
+    inset 0 0 8px color-mix(in srgb, var(--destructive, #c53b53) 70%, transparent) !important;
+  animation: collision-pulse 0.5s ease-in-out infinite alternate;
+}
+
+@keyframes collision-pulse {
+  0% {
+    box-shadow: 
+      0 0 12px color-mix(in srgb, var(--destructive, #c53b53) 90%, transparent),
+      0 0 24px color-mix(in srgb, var(--destructive, #c53b53) 60%, transparent),
+      inset 0 0 8px color-mix(in srgb, var(--destructive, #c53b53) 70%, transparent);
+  }
+  100% {
+    box-shadow: 
+      0 0 20px color-mix(in srgb, var(--destructive, #c53b53) 100%, transparent),
+      0 0 40px color-mix(in srgb, var(--destructive, #c53b53) 80%, transparent),
+      inset 0 0 12px color-mix(in srgb, var(--destructive, #c53b53) 90%, transparent);
+  }
+}
+
 /* =========================================================
    Food Rendering
    ========================================================= */

src/useGame/useGame.ts

@@ -16,7 +16,7 @@ export function useGame(cols: number, rows: number, platformHook?: unknown) {
   const foodManager = useFood(cols, rows, rendererManager);
 
   const gameManager = useGameStatus(rendererManager, snakeManager, foodManager);
-  const { gameStatus, startGame, stopGame, score } = gameManager;
+  const { gameStatus, startGame, stopGame, score, level } = gameManager;
 
   useEffect(() => {
     renderBoard(cols, rows);
@@ -37,6 +37,7 @@ export function useGame(cols: number, rows: number, platformHook?: unknown) {
     startGame,
     stopGame,
     score,
+    level,
     ...snakeManager,
     ...foodManager,
     ...keyBindings,

src/useGame/useGameStatus.ts

@@ -4,7 +4,8 @@ import type { UseRendererType } from "./useRenderer";
 import type { UseSnakeType } from "./useSnake";
 import type { UseFoodType } from "./useFood";
 
-const FRAMES_PER_SECOND = 5;
+const INITIAL_FPS = 5;
+const FOODS_PER_LEVEL = 2;
 
 export function useGameStatus(
   rendererManager: UseRendererType,
@@ -16,10 +17,14 @@ export function useGameStatus(
   const { spawnFood, clearFood } = foodManager;
   const [gameStatus, setGameStatus] = useState<GameStatus>("waiting");
   const [score, setScore] = useState(0);
+  const [level, setLevel] = useState(1);
+  const foodsEatenRef = useRef(0);
   const gameLoopRef = useRef<number | null>(null);
   const lastUpdateRef = useRef<number>(0);
   const snakeManagerRef = useRef(snakeManager);
   const foodManagerRef = useRef(foodManager);
+  const currentFpsRef = useRef(INITIAL_FPS);
+  const collisionGracePeriodRef = useRef(false);
 
   snakeManagerRef.current = snakeManager;
   foodManagerRef.current = foodManager;
@@ -28,6 +33,10 @@ export function useGameStatus(
     initSnake();
     spawnFood(snakeBodyRef.current, 3);
     setScore(0);
+    setLevel(1);
+    foodsEatenRef.current = 0;
+    currentFpsRef.current = INITIAL_FPS;
+    collisionGracePeriodRef.current = false;
     setGameStatus("started");
   };
 
@@ -40,8 +49,8 @@ export function useGameStatus(
     clearFood();
     setGameStatus("waiting");
     const container = containerRef.current;
-    container?.querySelectorAll(".snake-head, .snake-body, .snake-tail").forEach((el) => {
-      el.classList.remove("snake-head", "snake-body", "snake-tail");
+    container?.querySelectorAll(".snake-head, .snake-body, .snake-tail, .collision").forEach((el) => {
+      el.classList.remove("snake-head", "snake-body", "snake-tail", "collision");
     });
   };
 
@@ -51,10 +60,10 @@ export function useGameStatus(
       console.log("Starting game loop");
       
       let shouldGrow = false;
-      const msPerFrame = 1000 / FRAMES_PER_SECOND;
       lastUpdateRef.current = performance.now();
 
       const gameLoop = (timestamp: number) => {
+        const msPerFrame = 1000 / currentFpsRef.current;
         const elapsed = timestamp - lastUpdateRef.current;
 
         if (elapsed >= msPerFrame) {
@@ -64,17 +73,44 @@ export function useGameStatus(
           
           shouldGrow = false;
           
-          if (result === "wall-collision") {
-            setGameStatus("game-over");
-            return;
+          if (result === "wall-collision" || result === "self-collision") {
+            if (collisionGracePeriodRef.current) {
+              const container = containerRef.current;
+              container?.querySelectorAll(".snake-head, .snake-body, .snake-tail").forEach((el) => {
+                el.classList.add("collision");
+              });
+              setGameStatus("game-over");
+              return;
+            } else {
+              collisionGracePeriodRef.current = true;
+              lastUpdateRef.current = timestamp;
+              gameLoopRef.current = requestAnimationFrame(gameLoop);
+              return;
+            }
           }
+          
+          collisionGracePeriodRef.current = false;
 
           const head = snakeManagerRef.current.snakeBodyRef.current[0];
           if (head && foodManagerRef.current.checkFoodCollision(head)) {
             console.log("Food eaten!");
             foodManagerRef.current.removeFood(head);
             shouldGrow = true;
-            setScore((prev) => prev + 1);
+            
+            foodsEatenRef.current += 1;
+            
+            if (foodsEatenRef.current >= FOODS_PER_LEVEL) {
+              setLevel((lvl) => {
+                const newLevel = lvl + 1;
+                currentFpsRef.current = INITIAL_FPS + (newLevel - 1);
+                console.log(`Level up! Level ${newLevel}, FPS: ${currentFpsRef.current}`);
+                return newLevel;
+              });
+              foodsEatenRef.current = 0;
+            }
+            
+            setScore((prev) => prev + level);
+            
             foodManagerRef.current.spawnFood(
               snakeManagerRef.current.snakeBodyRef.current,
               1
@@ -114,6 +150,7 @@ export function useGameStatus(
     startGame,
     stopGame,
     score,
+    level,
   };
 }
 

src/useGame/useSnake.ts

@@ -12,6 +12,7 @@ export function useSnake(
   const snakeBodyRef = useRef<SnakeBody>([]);
   const [direction, setDirection] = useState<Direction>("up");
   const directionRef = useRef<Direction>("up");
+  const lastMovedDirectionRef = useRef<Direction>("up");
 
   const initSnake = () => {
     const centerR = Math.floor(rows / 2);
@@ -27,6 +28,7 @@ export function useSnake(
     snakeBodyRef.current = initialBody;
     setDirection("up");
     directionRef.current = "up";
+    lastMovedDirectionRef.current = "up";
     renderSnake(initialBody);
   };
 
@@ -35,6 +37,7 @@ export function useSnake(
     snakeBodyRef.current = [];
     setDirection("up");
     directionRef.current = "up";
+    lastMovedDirectionRef.current = "up";
   };
 
   const renderSnake = (body: SnakeBody) => {
@@ -100,7 +103,7 @@ export function useSnake(
       right: "left",
     };
 
-    if (opposites[directionRef.current] !== newDirection) {
+    if (opposites[lastMovedDirectionRef.current] !== newDirection) {
       setDirection(newDirection);
       directionRef.current = newDirection;
     }
@@ -136,10 +139,23 @@ export function useSnake(
     }
 
     const newHead = { r: newR, c: newC };
+
+    // Check self-collision (excluding tail if not growing, as tail will move)
+    const bodyToCheck = grow ? body : body.slice(0, -1);
+    const collision = bodyToCheck.some(
+      (segment) => segment.r === newHead.r && segment.c === newHead.c
+    );
+
+    if (collision) {
+      return "self-collision";
+    }
+
     const newBody = grow 
       ? [newHead, ...body]
       : [newHead, ...body.slice(0, -1)];
 
+    lastMovedDirectionRef.current = dir;
+    
     setSnakeBody(newBody);
     snakeBodyRef.current = newBody;
     renderSnake(newBody);