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

/**** 
* Classes
****/ 
// Circle class: represents a tappable circle
var TapCircle = Container.expand(function () {
	var self = Container.call(this);
	// Create and attach a colored ellipse asset
	// Color is randomized for each circle
	var color = TapCircle.randomColor();
	var circle = self.attachAsset('tapCircle', {
		width: TapCircle.RADIUS * 2,
		height: TapCircle.RADIUS * 2,
		color: color,
		shape: 'ellipse',
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Store color for possible future use
	self.color = color;
	// Set up a timer for auto-destroy
	self.lifetime = TapCircle.lifetime; // ms
	self.spawnTick = LK.ticks;
	// Mark as alive
	self.alive = true;
	// Called every tick by LK engine
	self.update = function () {
		// If lifetime expired, trigger game over
		if (self.alive && (LK.ticks - self.spawnTick) * (1000 / 60) > self.lifetime) {
			// Flash screen red and end game
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			self.alive = false;
		}
	};
	// Called when the circle is tapped
	self.down = function (x, y, obj) {
		if (!self.alive) return;
		self.alive = false;
		// Animate: quick scale up and fade out
		tween(self, {
			scaleX: 1.3,
			scaleY: 1.3,
			alpha: 0
		}, {
			duration: 180,
			easing: tween.cubicOut,
			onFinish: function onFinish() {
				self.destroy();
			}
		});
		// Score is handled in game.down
	};
	return self;
});

/**** 
* Initialize Game
****/ 
// Static properties for TapCircle
var game = new LK.Game({
	// No title, no description
	// Always backgroundColor is black
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Score display
// Tween plugin for animations (not strictly needed for MVP, but included for future use)
// Static properties for TapCircle
TapCircle.RADIUS = 140; // px
TapCircle.lifetime = 1200; // ms, will decrease as game speeds up
// Helper: random pastel color
TapCircle.randomColor = function () {
	// Pastel: high value, medium saturation
	var hue = Math.floor(Math.random() * 360);
	var rgb = TapCircle.hsvToRgb(hue / 360, 0.5, 0.95);
	return rgb[0] << 16 | rgb[1] << 8 | rgb[2];
};
// HSV to RGB helper
TapCircle.hsvToRgb = function (h, s, v) {
	var r, g, b, i, f, p, q, t;
	i = Math.floor(h * 6);
	f = h * 6 - i;
	p = v * (1 - s);
	q = v * (1 - f * s);
	t = v * (1 - (1 - f) * s);
	switch (i % 6) {
		case 0:
			r = v, g = t, b = p;
			break;
		case 1:
			r = q, g = v, b = p;
			break;
		case 2:
			r = p, g = v, b = t;
			break;
		case 3:
			r = p, g = q, b = v;
			break;
		case 4:
			r = t, g = p, b = v;
			break;
		case 5:
			r = v, g = p, b = q;
			break;
	}
	return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
};
var scoreTxt = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Global state
var circles = [];
var canTap = true; // Prevents double taps in a single frame
// Game speed state
var minLifetime = 600; // ms, minimum allowed
var maxLifetime = 1200; // ms, starting value
var speedupEvery = 3; // Speed up every N points
var speedupAmount = 80; // ms decrease per speedup
// Spawn a new circle at a random position
function spawnCircle() {
	// Remove any existing circles
	for (var i = circles.length - 1; i >= 0; i--) {
		if (circles[i] && circles[i].alive) {
			circles[i].destroy();
		}
		circles.splice(i, 1);
	}
	// Calculate safe area (avoid top 200px and bottom 200px, and left/right 150px)
	var marginX = TapCircle.RADIUS + 150;
	var marginY = TapCircle.RADIUS + 200;
	var x = marginX + Math.random() * (2048 - marginX * 2);
	var y = marginY + Math.random() * (2732 - marginY * 2);
	// Create and position circle
	var circle = new TapCircle();
	circle.x = x;
	circle.y = y;
	circle.scaleX = 1;
	circle.scaleY = 1;
	circle.alpha = 1;
	// Set current lifetime (difficulty)
	circle.lifetime = TapCircle.lifetime;
	game.addChild(circle);
	circles.push(circle);
}
// Handle tap events
game.down = function (x, y, obj) {
	if (!canTap) return;
	canTap = false;
	// Check if tap is inside any alive circle
	var tapped = false;
	for (var i = 0; i < circles.length; i++) {
		var c = circles[i];
		if (c && c.alive) {
			// Convert tap to local circle coordinates
			var local = c.toLocal(game.toGlobal({
				x: x,
				y: y
			}));
			var dx = local.x - 0;
			var dy = local.y - 0;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist <= TapCircle.RADIUS) {
				// Correct tap
				tapped = true;
				LK.getSound('tap').play();
				c.down(x, y, obj); // Animate and destroy
				// Score up
				var newScore = LK.getScore() + 1;
				LK.setScore(newScore);
				scoreTxt.setText(newScore);
				// Speed up game
				if (newScore % speedupEvery === 0 && TapCircle.lifetime > minLifetime) {
					TapCircle.lifetime = Math.max(minLifetime, TapCircle.lifetime - speedupAmount);
				}
				// Spawn next circle after a short delay
				LK.setTimeout(function () {
					spawnCircle();
					canTap = true;
				}, 120);
				break;
			}
		}
	}
	if (!tapped) {
		// Tapped outside any circle: game over
		LK.effects.flashScreen(0xff0000, 800);
		LK.showGameOver();
	}
};
// Allow tap again after up
game.up = function (x, y, obj) {
	canTap = true;
};
// Main update loop
game.update = function () {
	// Update all circles
	for (var i = circles.length - 1; i >= 0; i--) {
		if (circles[i] && circles[i].update) {
			circles[i].update();
		}
	}
};
// Start the game
function startGame() {
	LK.setScore(0);
	scoreTxt.setText(0);
	TapCircle.lifetime = maxLifetime;
	LK.playMusic('music');
	spawnCircle();
	canTap = true;
	gameStarted = true;
}
// Only spawn the first circle after the first tap
var gameStarted = false;
// Show the start asset at the center of the screen
var startAsset = LK.getAsset('start', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 / 2
});
game.addChild(startAsset);
game.down = function (x, y, obj) {
	if (!gameStarted) {
		// Remove the start asset
		if (startAsset && startAsset.parent) {
			startAsset.parent.removeChild(startAsset);
		}
		startGame();
		return;
	}
	if (!canTap) return;
	canTap = false;
	// Check if tap is inside any alive circle
	var tapped = false;
	for (var i = 0; i < circles.length; i++) {
		var c = circles[i];
		if (c && c.alive) {
			// Convert tap to local circle coordinates
			var local = c.toLocal(game.toGlobal({
				x: x,
				y: y
			}));
			var dx = local.x - 0;
			var dy = local.y - 0;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist <= TapCircle.RADIUS) {
				// Correct tap
				tapped = true;
				LK.getSound('tap').play();
				c.down(x, y, obj); // Animate and destroy
				// Score up
				var newScore = LK.getScore() + 1;
				LK.setScore(newScore);
				scoreTxt.setText(newScore);
				// Speed up game
				if (newScore % speedupEvery === 0 && TapCircle.lifetime > minLifetime) {
					TapCircle.lifetime = Math.max(minLifetime, TapCircle.lifetime - speedupAmount);
				}
				// Spawn next circle after a short delay
				LK.setTimeout(function () {
					spawnCircle();
					canTap = true;
				}, 120);
				break;
			}
		}
	}
	if (!tapped) {
		// Tapped outside any circle: game over
		LK.effects.flashScreen(0xff0000, 800);
		LK.showGameOver();
	}
};
// Allow tap again after up
game.up = function (x, y, obj) {
	canTap = true;
};

===================================================================
--- original.js
+++ change.js
@@ -215,8 +215,9 @@
 function startGame() {
 	LK.setScore(0);
 	scoreTxt.setText(0);
 	TapCircle.lifetime = maxLifetime;
+	LK.playMusic('music');
 	spawnCircle();
 	canTap = true;
 	gameStarted = true;
 }