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

/**** 
* Classes
****/ 
// Chicken class
var Chicken = Container.expand(function () {
	var self = Container.call(this);
	var chickenSprite = self.attachAsset('chicken', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = chickenSprite.width * 0.5;
	self.vy = 0;
	self.gravity = 2.2;
	self.flapStrength = -38;
	self.maxFall = 38;
	self.alive = true;
	// Flap upward
	self.flap = function () {
		if (!self.alive) return;
		self.vy = self.flapStrength;
		LK.getSound('flap').play();
		// Animate chicken (slight scale for feedback)
		tween.stop(self, {
			scaleY: true
		});
		self.scaleY = 1.0;
		tween(self, {
			scaleY: 0.8
		}, {
			duration: 80,
			easing: tween.cubicOut,
			onFinish: function onFinish() {
				tween(self, {
					scaleY: 1.0
				}, {
					duration: 120,
					easing: tween.cubicIn
				});
			}
		});
	};
	// Update position
	self.update = function () {
		if (!self.alive) return;
		self.vy += self.gravity;
		if (self.vy > self.maxFall) self.vy = self.maxFall;
		self.y += self.vy;
		// Rotate chicken based on velocity
		var maxAngle = Math.PI / 3;
		var minAngle = -Math.PI / 6;
		var t = (self.vy + 38) / (self.maxFall + 38);
		chickenSprite.rotation = minAngle + (maxAngle - minAngle) * t;
	};
	// Die
	self.die = function () {
		self.alive = false;
		// Fall fast
		self.vy = 18;
		// Flash red
		LK.effects.flashObject(self, 0xff0000, 400);
	};
	return self;
});
// PipePair class (top and bottom pipes)
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	var topCap = self.attachAsset('pipecap', {
		anchorX: 0.5,
		anchorY: 1.0,
		y: -topPipe.height
	});
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.0,
		y: 0
	});
	var bottomCap = self.attachAsset('pipecap', {
		anchorX: 0.5,
		anchorY: 0.0,
		y: bottomPipe.height
	});
	// For collision
	self.topPipe = topPipe;
	self.bottomPipe = bottomPipe;
	// Has the chicken passed this pipe?
	self.passed = false;
	// Set gap and position
	self.setGap = function (gapY, gapHeight) {
		// Top pipe: bottom at gapY - gapHeight/2
		topPipe.height = Math.max(120, gapY - gapHeight / 2);
		topCap.y = -topPipe.height;
		// Bottom pipe: top at gapY + gapHeight/2
		bottomPipe.y = gapY + gapHeight / 2;
		bottomPipe.height = Math.max(120, 2732 - bottomPipe.y - 120);
		bottomCap.y = bottomPipe.y + bottomPipe.height;
	};
	// Move pipes left
	self.update = function () {
		self.x -= pipeSpeed;
	};
	// Destroy
	self.destroyPair = function () {
		self.destroy();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// Sound for hit
// Sound for point
// Sound for flap
// Ground
// Obstacle (pipe cap)
// Obstacle (pipe)
// Chicken (player)
// Game constants
var GROUND_HEIGHT = 120;
var CHICKEN_START_X = 600;
var CHICKEN_START_Y = 1200;
var PIPE_INTERVAL = 1100; // px between pipes
var PIPE_MIN_GAP = 340;
var PIPE_MAX_GAP = 520;
var PIPE_MIN_Y = 420;
var PIPE_MAX_Y = 2732 - GROUND_HEIGHT - 420;
var pipeSpeed = 16;
var pipePairs = [];
var score = 0;
var bestScore = storage.flyingChickenBestScore || 0;
var gameStarted = false;
var gameOver = false;
var dragNode = null;
var lastPassedPipe = null;
// Score text
var scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFF700
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Best score text (bottom center)
var bestScoreTxt = new Text2('', {
	size: 70,
	fill: 0xFFFFFF
});
bestScoreTxt.anchor.set(0.5, 1);
LK.gui.bottom.addChild(bestScoreTxt);
// Ground
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2732 - GROUND_HEIGHT
});
game.addChild(ground);
// Chicken
var chicken = new Chicken();
game.addChild(chicken);
chicken.x = CHICKEN_START_X;
chicken.y = CHICKEN_START_Y;
// Helper: reset game state
function resetGame() {
	// Remove pipes
	for (var i = 0; i < pipePairs.length; i++) {
		pipePairs[i].destroyPair();
	}
	pipePairs = [];
	score = 0;
	scoreTxt.setText('0');
	chicken.x = CHICKEN_START_X;
	chicken.y = CHICKEN_START_Y;
	chicken.vy = 0;
	chicken.alive = true;
	chicken.rotation = 0;
	gameStarted = false;
	gameOver = false;
	pipeSpeed = 16;
	lastPassedPipe = null;
	// Show best score
	if (bestScore > 0) {
		bestScoreTxt.setText('Best: ' + bestScore);
	} else {
		bestScoreTxt.setText('');
	}
	// Start 8-bit background music
	LK.playMusic('8-bit');
}
// Helper: spawn a new pipe pair
function spawnPipePair() {
	// Gap size decreases as score increases
	var gapHeight = Math.max(PIPE_MIN_GAP, PIPE_MAX_GAP - score * 8);
	// Gap Y position
	var gapY = PIPE_MIN_Y + Math.random() * (PIPE_MAX_Y - PIPE_MIN_Y);
	var pair = new PipePair();
	pair.x = 2048 + 200;
	pair.setGap(gapY, gapHeight);
	game.addChild(pair);
	pipePairs.push(pair);
}
// Helper: check collision between chicken and a pipe
function checkPipeCollision(chicken, pipePair) {
	// Chicken bounding circle
	var cx = chicken.x;
	var cy = chicken.y;
	var r = chicken.radius * 0.92;
	// Top pipe rect
	var tp = pipePair.topPipe;
	var tpx = pipePair.x;
	var tpy = tp.y + pipePair.y;
	var tpw = tp.width;
	var tph = tp.height;
	// Bottom pipe rect
	var bp = pipePair.bottomPipe;
	var bpx = pipePair.x;
	var bpy = bp.y + pipePair.y;
	var bpw = bp.width;
	var bph = bp.height;
	// Circle-rect collision
	function circleRectCollide(cx, cy, r, rx, ry, rw, rh) {
		var closestX = Math.max(rx - rw / 2, Math.min(cx, rx + rw / 2));
		var closestY = Math.max(ry, Math.min(cy, ry + rh));
		var dx = cx - closestX;
		var dy = cy - closestY;
		return dx * dx + dy * dy < r * r;
	}
	// Top pipe
	if (circleRectCollide(cx, cy, r, tpx, tpy - tph, tpw, tph)) return true;
	// Bottom pipe
	if (circleRectCollide(cx, cy, r, bpx, bpy, bpw, bph)) return true;
	return false;
}
// Helper: check collision with ground or ceiling
function checkGroundCeiling(chicken) {
	if (chicken.y + chicken.radius > 2732 - GROUND_HEIGHT) return true;
	if (chicken.y - chicken.radius < 0) return true;
	return false;
}
// Start game on first tap
function startGame() {
	if (gameStarted) return;
	resetGame();
	gameStarted = true;
	// Spawn initial pipes
	for (var i = 0; i < 3; i++) {
		var pair = new PipePair();
		pair.x = 2048 + 600 + i * PIPE_INTERVAL;
		var gapHeight = Math.max(PIPE_MIN_GAP, PIPE_MAX_GAP - score * 8);
		var gapY = PIPE_MIN_Y + Math.random() * (PIPE_MAX_Y - PIPE_MIN_Y);
		pair.setGap(gapY, gapHeight);
		game.addChild(pair);
		pipePairs.push(pair);
	}
}
// Game tap: chicken flaps
game.down = function (x, y, obj) {
	if (gameOver) return;
	if (!gameStarted) {
		startGame();
	}
	chicken.flap();
	dragNode = chicken;
};
// Release: nothing (but required for dragNode)
game.up = function (x, y, obj) {
	dragNode = null;
};
// Move: not used for chicken, but required for dragNode
game.move = function (x, y, obj) {
	// No drag for chicken, but required for completeness
};
// Main game loop
game.update = function () {
	if (!gameStarted) return;
	// Chicken update
	chicken.update();
	// Pipes update
	for (var i = pipePairs.length - 1; i >= 0; i--) {
		var pair = pipePairs[i];
		pair.update();
		// Remove pipes off screen
		if (pair.x < -300) {
			pair.destroyPair();
			pipePairs.splice(i, 1);
			continue;
		}
		// Check for passing pipe (score)
		if (!pair.passed && pair.x + 110 < chicken.x) {
			pair.passed = true;
			score += 1;
			scoreTxt.setText(score + '');
			LK.getSound('point').play();
			// Increase speed every 10 points
			if (score % 10 === 0) {
				pipeSpeed += 1.5;
			}
		}
	}
	// Spawn new pipes
	if (pipePairs.length === 0 || pipePairs[pipePairs.length - 1].x < 2048 - PIPE_INTERVAL) {
		spawnPipePair();
	}
	// Collision detection
	var collided = false;
	for (var i = 0; i < pipePairs.length; i++) {
		if (checkPipeCollision(chicken, pipePairs[i])) {
			collided = true;
			break;
		}
	}
	if (checkGroundCeiling(chicken)) {
		collided = true;
	}
	if (collided && chicken.alive) {
		chicken.die();
		LK.getSound('hit').play();
		gameOver = true;
		// Stop music on game over
		LK.stopMusic();
		// Update best score
		if (score > bestScore) {
			bestScore = score;
			storage.flyingChickenBestScore = bestScore;
		}
		// Flash screen
		LK.effects.flashScreen(0xff0000, 800);
		// Show game over (auto resets)
		LK.setTimeout(function () {
			// Show best score in the bestScoreTxt (bottom center) before game over popup
			if (bestScore > 0) {
				bestScoreTxt.setText('Best: ' + bestScore);
			} else {
				bestScoreTxt.setText('');
			}
			LK.showGameOver();
		}, 600);
	}
};
// On game over, reset state
LK.on('gameover', function () {
	resetGame();
});
// On you win (not used, but for completeness)
LK.on('youwin', function () {
	resetGame();
});
// Initial state
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -344,9 +344,14 @@
 		// Flash screen
 		LK.effects.flashScreen(0xff0000, 800);
 		// Show game over (auto resets)
 		LK.setTimeout(function () {
-			LK.setGameOverText('Best: ' + bestScore);
+			// Show best score in the bestScoreTxt (bottom center) before game over popup
+			if (bestScore > 0) {
+				bestScoreTxt.setText('Best: ' + bestScore);
+			} else {
+				bestScoreTxt.setText('');
+			}
 			LK.showGameOver();
 		}, 600);
 	}
 };