/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Acid Bubble (obstacle)
var AcidBubble = Container.expand(function () {
	var self = Container.call(this);
	var bubble = self.attachAsset('acidBubble', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = bubble.width / 2;
	self.vx = (Math.random() - 0.5) * 6;
	self.vy = (Math.random() - 0.5) * 6;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
		// Bounce off belly walls
		if (self.x < snakeBelly.x - snakeBelly.width / 2 + self.radius) {
			self.x = snakeBelly.x - snakeBelly.width / 2 + self.radius;
			self.vx *= -1;
		}
		if (self.x > snakeBelly.x + snakeBelly.width / 2 - self.radius) {
			self.x = snakeBelly.x + snakeBelly.width / 2 - self.radius;
			self.vx *= -1;
		}
		if (self.y < snakeBelly.y - snakeBelly.height / 2 + self.radius) {
			self.y = snakeBelly.y - snakeBelly.height / 2 + self.radius;
			self.vy *= -1;
		}
		if (self.y > snakeBelly.y + snakeBelly.height / 2 - self.radius) {
			self.y = snakeBelly.y + snakeBelly.height / 2 - self.radius;
			self.vy *= -1;
		}
	};
	return self;
});
// Animal class
var Animal = Container.expand(function () {
	var self = Container.call(this);
	// Defensive: set a default assetId if not set
	if (!self.assetId) self.assetId = 'pig';
	// Asset id is passed in as self.assetId
	var animalSprite = self.attachAsset(self.assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = animalSprite.width / 2;
	// Used for movement
	self.vx = 0;
	self.vy = 0;
	self.isSelected = false;
	// Called every tick
	self.update = function () {
		// Gravity inside snake
		self.vy += 0.5;
		self.x += self.vx;
		self.y += self.vy;
		// Friction
		self.vx *= 0.95;
		self.vy *= 0.95;
		// Keep inside belly bounds
		if (self.x < snakeBelly.x - snakeBelly.width / 2 + self.radius) {
			self.x = snakeBelly.x - snakeBelly.width / 2 + self.radius;
			self.vx *= -0.5;
		}
		if (self.x > snakeBelly.x + snakeBelly.width / 2 - self.radius) {
			self.x = snakeBelly.x + snakeBelly.width / 2 - self.radius;
			self.vx *= -0.5;
		}
		if (self.y < snakeBelly.y - snakeBelly.height / 2 + self.radius) {
			self.y = snakeBelly.y - snakeBelly.height / 2 + self.radius;
			self.vy *= -0.5;
		}
		if (self.y > snakeBelly.y + snakeBelly.height / 2 - self.radius) {
			self.y = snakeBelly.y + snakeBelly.height / 2 - self.radius;
			self.vy *= -0.5;
		}
	};
	// Touch down on animal
	self.down = function (x, y, obj) {
		self.isSelected = true;
		selectedAnimal = self;
		dragOffsetX = self.x - x;
		dragOffsetY = self.y - y;
	};
	// Touch up
	self.up = function (x, y, obj) {
		self.isSelected = false;
		selectedAnimal = null;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// Sound for animal jump
// Exit (esophagus opening)
// Obstacle (stomach acid bubble)
// Snake exterior (for outside interaction)
// Snake belly (background)
// Animal shapes (simple colored ellipses for each animal)
// --- Global variables ---
var animalIds = ['pig', 'cat', 'bee', 'frog', 'polarBear', 'elephant', 'bird', 'snail', 'axolotl', 'pinkFox', 'boyBat', 'wolf', 'chinchilla', 'moth', 'goat', 'bunny', 'bear', 'deer'];
var animals = [];
var acidBubbles = [];
var selectedAnimal = null;
var dragOffsetX = 0;
var dragOffsetY = 0;
var insideMode = true; // true: inside snake, false: outside
var snakeBelly, snakeSkin, exitNode;
var scoreTxt;
var rescuedCount = 0;
var totalToRescue = 5; // MVP: rescue 5 animals to win
// --- Setup snake belly (inside) ---
snakeBelly = LK.getAsset('snakeBelly', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 1200
});
game.addChild(snakeBelly);
// --- Setup exit (esophagus opening) ---
exitNode = LK.getAsset('exit', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 800
});
game.addChild(exitNode);
// --- Setup animals ---
function spawnAnimals() {
	animals = [];
	var startX = 2048 / 2 - 400;
	var startY = 1200;
	for (var i = 0; i < totalToRescue; i++) {
		var id = animalIds[i];
		var animal = new Animal();
		animal.assetId = id;
		animal.x = startX + i * 200;
		animal.y = startY + Math.random() * 100 - 50;
		animal.vx = (Math.random() - 0.5) * 6;
		animal.vy = (Math.random() - 0.5) * 6;
		animals.push(animal);
		game.addChild(animal);
	}
}
spawnAnimals();
// --- Setup acid bubbles (obstacles) ---
function spawnAcidBubbles() {
	acidBubbles = [];
	for (var i = 0; i < 3; i++) {
		var bubble = new AcidBubble();
		bubble.x = 2048 / 2 + (Math.random() - 0.5) * 600;
		bubble.y = 1200 + (Math.random() - 0.5) * 300;
		acidBubbles.push(bubble);
		game.addChild(bubble);
	}
}
spawnAcidBubbles();
// --- Setup score text ---
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Setup snake skin (outside) ---
snakeSkin = LK.getAsset('snakeSkin', {
	anchorX: 0.5,
	anchorY: 0,
	x: 2048 / 2,
	y: 0
});
// Not added yet; only shown in outside mode
// --- Helper: reset game state ---
function resetGame() {
	// Remove all animals and bubbles
	for (var i = 0; i < animals.length; i++) animals[i].destroy();
	for (var i = 0; i < acidBubbles.length; i++) acidBubbles[i].destroy();
	animals = [];
	acidBubbles = [];
	rescuedCount = 0;
	scoreTxt.setText('0');
	insideMode = true;
	if (snakeSkin.parent) snakeSkin.parent.removeChild(snakeSkin);
	if (!snakeBelly.parent) game.addChild(snakeBelly);
	if (!exitNode.parent) game.addChild(exitNode);
	spawnAnimals();
	spawnAcidBubbles();
}
// --- Touch/drag logic ---
game.move = function (x, y, obj) {
	if (!insideMode) return;
	if (selectedAnimal) {
		// Move animal with finger
		selectedAnimal.x = x + dragOffsetX;
		selectedAnimal.y = y + dragOffsetY;
	}
};
game.down = function (x, y, obj) {
	if (!insideMode) return;
	// Check if any animal is touched
	for (var i = 0; i < animals.length; i++) {
		var a = animals[i];
		var dx = x - a.x;
		var dy = y - a.y;
		if (dx * dx + dy * dy < a.radius * a.radius) {
			a.down(x, y, obj);
			return;
		}
	}
};
game.up = function (x, y, obj) {
	if (!insideMode) return;
	if (selectedAnimal) {
		// Give a jump impulse upwards
		selectedAnimal.vy = -18;
		selectedAnimal.vx = (Math.random() - 0.5) * 8;
		LK.getSound('jump').play();
		selectedAnimal.up(x, y, obj);
	}
};
// --- Outside mode: tap snake skin to help animals escape ---
snakeSkin.down = function (x, y, obj) {
	if (!insideMode) {
		// "Massage" the snake: all animals get a little upward boost
		for (var i = 0; i < animals.length; i++) {
			animals[i].vy -= 10 + Math.random() * 6;
		}
		// Animate snake skin
		tween(snakeSkin, {
			y: 20
		}, {
			duration: 120,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(snakeSkin, {
					y: 0
				}, {
					duration: 180,
					easing: tween.easeIn
				});
			}
		});
	}
};
// --- Game update loop ---
game.update = function () {
	// Switch between inside/outside every 10 seconds
	if (LK.ticks % 600 === 0) {
		insideMode = !insideMode;
		if (insideMode) {
			// Show inside
			if (!snakeBelly.parent) game.addChild(snakeBelly);
			if (!exitNode.parent) game.addChild(exitNode);
			if (snakeSkin.parent) snakeSkin.parent.removeChild(snakeSkin);
		} else {
			// Show outside
			if (!snakeSkin.parent) game.addChild(snakeSkin);
			if (snakeBelly.parent) snakeBelly.parent.removeChild(snakeBelly);
			if (exitNode.parent) exitNode.parent.removeChild(exitNode);
		}
	}
	// Update animals
	for (var i = animals.length - 1; i >= 0; i--) {
		var a = animals[i];
		a.update();
		// If animal touches exit, rescue it!
		if (insideMode && a.intersects(exitNode)) {
			// Animate out
			tween(a, {
				y: exitNode.y - 200
			}, {
				duration: 400,
				easing: tween.easeIn,
				onFinish: function onFinish() {
					a.destroy();
				}
			});
			animals.splice(i, 1);
			rescuedCount++;
			scoreTxt.setText(rescuedCount);
			// Win condition
			if (rescuedCount >= totalToRescue) {
				LK.showYouWin();
				return;
			}
		}
	}
	// Update acid bubbles
	for (var i = acidBubbles.length - 1; i >= 0; i--) {
		var b = acidBubbles[i];
		b.update();
		// If any animal hits a bubble, game over
		for (var j = 0; j < animals.length; j++) {
			var a = animals[j];
			var dx = a.x - b.x;
			var dy = a.y - b.y;
			var dist = a.radius + b.radius - 10;
			if (dx * dx + dy * dy < dist * dist) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			}
		}
	}
};
// --- Reset game on game over or win ---
LK.on('gameover', function () {
	resetGame();
});
LK.on('youwin', function () {
	resetGame();
});
// --- Instructions text ---
var instructions = new Text2("Drag animals to help them jump to the exit!\nAvoid acid bubbles.\nSometimes tap the snake's back to help!", {
	size: 60,
	fill: "#fff"
});
instructions.anchor.set(0.5, 0);
LK.gui.top.addChild(instructions);
instructions.y = 180;
instructions.x = 2048 / 2;

===================================================================
--- original.js
+++ change.js
@@ -41,8 +41,10 @@
 });
 // Animal class
 var Animal = Container.expand(function () {
 	var self = Container.call(this);
+	// Defensive: set a default assetId if not set
+	if (!self.assetId) self.assetId = 'pig';
 	// Asset id is passed in as self.assetId
 	var animalSprite = self.attachAsset(self.assetId, {
 		anchorX: 0.5,
 		anchorY: 0.5