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

/**** 
* Classes
****/ 
// Ball class for both chain and shot balls
var Ball = Container.expand(function () {
	var self = Container.call(this);
	// color: 'red', 'blue', 'green', 'yellow'
	self.color = 'red';
	self.radius = 45; // 90/2, for collision
	self.isChain = true; // true if part of chain, false if shot
	// Attach correct asset (always ellipse)
	var assetId = 'ball_' + self.color;
	var ballAsset = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For chain balls, we keep a t value (0-1) for position along the path
	self.t = 0;
	// For shot balls, we keep velocity
	self.vx = 0;
	self.vy = 0;
	// For chain balls, we keep index in chain
	self.chainIndex = 0;
	// For shot balls, we keep a flag if it's active
	self.active = true;
	// Set color and update asset
	self.setColor = function (color) {
		self.color = color;
		var assetId = 'ball_' + color; // always ellipse
		// Remove old asset
		if (ballAsset) ballAsset.destroy();
		// Attach new asset (always ellipse)
		var newAsset = self.attachAsset(assetId, {
			anchorX: 0.5,
			anchorY: 0.5
		});
	};
	return self;
});
// Shooter class
var Shooter = Container.expand(function () {
	var self = Container.call(this);
	// Attach shooter asset
	var shooterAsset = self.attachAsset('shooter', {
		anchorX: 0.5,
		anchorY: 1,
		scaleX: 2.7,
		scaleY: 2.7
	});
	// The ball to be shot (preview)
	self.previewBall = null;
	// The angle the shooter is aiming (radians)
	self.angle = -Math.PI / 2;
	// Set preview ball color
	self.setPreviewColor = function (color) {
		if (self.previewBall) {
			self.previewBall.destroy();
		}
		self.previewBall = new Ball();
		self.previewBall.isChain = false;
		self.previewBall.setColor(color); // Ball class always uses ellipse asset
		// Place preview ball at the center of the shooter
		self.previewBall.x = 0;
		self.previewBall.y = 0;
		self.addChild(self.previewBall);
	};
	// Set shooter angle (radians)
	self.setAngle = function (angle) {
		self.angle = angle;
		self.rotation = angle + Math.PI / 2;
		// Do not update previewBall position here to keep nextball fixed at shooter center
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Play background music for the entire game session
LK.playMusic('music');
/*
We'll define a spiral path as a set of points (x, y) along which the chain balls move.
For MVP, use a simple Archimedean spiral centered in the screen.
We'll precompute N points along the spiral and interpolate between them.
*/
// --- Spiral Path Definition --- 
// Ball shapes (4 colors for MVP)
// Shooter (frog or cannon, simple green ellipse for MVP)
// Ball shoot sound
// Ball pop sound
var PATH_POINTS = [];
var PATH_LENGTH = 1200; // Number of points along the path
var SPIRAL_TURNS = 2.2; // How many turns
var SPIRAL_RADIUS = 900; // Max radius
var PATH_CENTER_X = 2048 / 2;
var PATH_CENTER_Y = 1200; // Slightly above center
// Spiral path visual: draw as small dots
var spiralPathDots = new Container();
game.addChild(spiralPathDots);
(function generateSpiralPath() {
	// First, generate a high-res spiral
	var HIGH_RES = 6000;
	var spiralHighRes = [];
	for (var i = 0; i < HIGH_RES; i++) {
		var t = i / (HIGH_RES - 1); // 0 to 1
		var angle = SPIRAL_TURNS * 2 * Math.PI * (1 - t) + Math.PI; // Reverse spiral: start outside, go in
		var radius = 180 + SPIRAL_RADIUS * (1 - t);
		var x = PATH_CENTER_X + Math.cos(angle) * radius;
		var y = PATH_CENTER_Y + Math.sin(angle) * radius;
		// Mirror x around center to flip horizontally
		x = PATH_CENTER_X - (x - PATH_CENTER_X);
		spiralHighRes.push({
			x: x,
			y: y
		});
	}
	// Compute cumulative arc length
	var arcLen = [0];
	for (var i = 1; i < spiralHighRes.length; i++) {
		var dx = spiralHighRes[i].x - spiralHighRes[i - 1].x;
		var dy = spiralHighRes[i].y - spiralHighRes[i - 1].y;
		arcLen[i] = arcLen[i - 1] + Math.sqrt(dx * dx + dy * dy);
	}
	var totalLen = arcLen[arcLen.length - 1];
	// Now, sample PATH_LENGTH points at equal arc length intervals
	for (var i = 0; i < PATH_LENGTH; i++) {
		var targetLen = i * totalLen / (PATH_LENGTH - 1);
		// Binary search for the closest arcLen index
		var lo = 0,
			hi = arcLen.length - 1;
		while (lo < hi) {
			var mid = Math.floor((lo + hi) / 2);
			if (arcLen[mid] < targetLen) lo = mid + 1;else hi = mid;
		}
		var idx = lo;
		// Interpolate between idx-1 and idx
		var p0 = spiralHighRes[Math.max(0, idx - 1)];
		var p1 = spiralHighRes[idx];
		var l0 = arcLen[Math.max(0, idx - 1)];
		var l1 = arcLen[idx];
		var frac = l1 - l0 > 0 ? (targetLen - l0) / (l1 - l0) : 0;
		var x = p0.x + (p1.x - p0.x) * frac;
		var y = p0.y + (p1.y - p0.y) * frac;
		PATH_POINTS.push({
			x: x,
			y: y
		});
		// Draw a small dot every 8th point for performance
		if (i % 8 === 0) {
			var dot = LK.getAsset('ball_blue', {
				anchorX: 0.5,
				anchorY: 0.5,
				scaleX: 0.18,
				scaleY: 0.18,
				x: x,
				y: y,
				alpha: 0.45
			});
			spiralPathDots.addChild(dot);
		}
	}
})();
// Helper: get position along path for t in [0,1]
function getPathPos(t) {
	var idx = t * (PATH_LENGTH - 1);
	var idx0 = Math.floor(idx);
	var idx1 = Math.min(PATH_LENGTH - 1, idx0 + 1);
	var frac = idx - idx0;
	var p0 = PATH_POINTS[idx0];
	var p1 = PATH_POINTS[idx1];
	if (!p0 || !p1) {
		// Defensive: If out of bounds, return center of screen
		return {
			x: PATH_CENTER_X,
			y: PATH_CENTER_Y
		};
	}
	return {
		x: p0.x + (p1.x - p0.x) * frac,
		y: p0.y + (p1.y - p0.y) * frac
	};
}
// Helper: get tangent angle at t
function getPathAngle(t) {
	var idx = t * (PATH_LENGTH - 1);
	var idx0 = Math.max(0, Math.floor(idx) - 2);
	var idx1 = Math.min(PATH_LENGTH - 1, idx0 + 4);
	var p0 = PATH_POINTS[idx0];
	var p1 = PATH_POINTS[idx1];
	return Math.atan2(p1.y - p0.y, p1.x - p0.x);
}
// --- Chain State ---
var chainBalls = []; // Array of Ball (in order, head at index 0)
var chainSpacing = 90; // px between centers (balls touch: 90px ball diameter)
var chainSpeed = 0.00028; // t per tick (slower movement for chain balls)
var chainHeadT = 0; // t of the head ball (0=start, 1=end)
var chainTailT = 0; // t of the tail ball
// --- Shooter State --- 
var shooter = new Shooter();
// Place shooter so its center aligns with the start of the guide line (spiral center)
var shooterAssetSize = LK.getAsset('shooter', {
	anchorX: 0.5,
	anchorY: 1,
	scaleX: 2.7,
	scaleY: 2.7
});
shooter.x = PATH_CENTER_X;
// Place shooter so its bottom is at the spiral center (anchorY:1 means y is at bottom)
shooter.y = PATH_CENTER_Y;
game.addChild(shooter);
// --- Shooter Guide Line ---
// We'll use a series of small dots (like spiralPathDots) to show the aim direction
var shooterGuideDots = new Container();
game.addChild(shooterGuideDots);
// Helper to update shooter guide line
function updateShooterGuide() {
	// Remove old dots
	while (shooterGuideDots.children.length > 0) {
		shooterGuideDots.children[0].destroy();
	}
	// Always show shooter guide line (removed isAiming check)
	// Draw dots every 50px, up to the screen edge
	var angle = shooter.angle;
	var sx = shooter.x + Math.cos(angle) * 60;
	var sy = shooter.y + Math.sin(angle) * 60;
	// Calculate how far we can go in this direction before hitting the screen edge
	function getEdgeDistance(x, y, angle) {
		// Calculate intersection with each edge, return the smallest positive distance
		var dx = Math.cos(angle);
		var dy = Math.sin(angle);
		var distances = [];
		// Left edge (x=0)
		if (dx < 0) {
			var t = (0 - x) / dx;
			if (t > 0) distances.push(t);
		}
		// Right edge (x=2048)
		if (dx > 0) {
			var t = (2048 - x) / dx;
			if (t > 0) distances.push(t);
		}
		// Top edge (y=0)
		if (dy < 0) {
			var t = (0 - y) / dy;
			if (t > 0) distances.push(t);
		}
		// Bottom edge (y=2732)
		if (dy > 0) {
			var t = (2732 - y) / dy;
			if (t > 0) distances.push(t);
		}
		if (distances.length === 0) return 0;
		return Math.min.apply(null, distances);
	}
	var maxDist = getEdgeDistance(shooter.x, shooter.y, angle) - 60; // minus shooter offset
	var lenStep = 50;
	var steps = Math.floor(maxDist / lenStep);
	for (var i = 1; i <= steps; i++) {
		var px = shooter.x + Math.cos(angle) * (60 + i * lenStep);
		var py = shooter.y + Math.sin(angle) * (60 + i * lenStep);
		// Don't draw outside game area (defensive)
		if (px < 0 || px > 2048 || py < 0 || py > 2732) break;
		var dot = LK.getAsset('ball_blue', {
			anchorX: 0.5,
			anchorY: 0.5,
			scaleX: 0.13,
			scaleY: 0.13,
			x: px,
			y: py,
			alpha: 0.7,
			// much more visible
			tint: 0x5ac8fa // light cyan for high contrast
		});
		shooterGuideDots.addChild(dot);
	}
}
// --- Shot Balls State ---
var shotBalls = []; // Array of Ball
// --- Game State ---
var colors = ['red', 'blue', 'green', 'yellow'];
var nextBallColor = colors[Math.floor(Math.random() * colors.length)];
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Initialize Chain ---
function initChain() {
	chainBalls = [];
	var N = 18; // Initial number of balls
	var t = 0.0;
	for (var i = 0; i < N; i++) {
		var ball = new Ball();
		var color = colors[Math.floor(Math.random() * colors.length)];
		ball.setColor(color);
		ball.isChain = true;
		ball.t = t;
		ball.chainIndex = i;
		var pos = getPathPos(t);
		ball.x = pos.x;
		ball.y = pos.y;
		game.addChild(ball);
		chainBalls.push(ball);
		t += chainSpacing / SPIRAL_RADIUS / (SPIRAL_TURNS * 2 * Math.PI); // Approximate t step
	}
	chainHeadT = chainBalls[0].t;
	chainTailT = chainBalls[chainBalls.length - 1].t;
}
initChain();
// --- Initialize Shooter ---
shooter.setPreviewColor(nextBallColor);
shooter.setAngle(-Math.PI / 2);
updateShooterGuide();
// --- Dragging / Aiming State ---
var isAiming = false;
// --- Helper: Find angle from shooter to (x, y) ---
function getShooterAngleTo(x, y) {
	var dx = x - shooter.x;
	var dy = y - shooter.y;
	return Math.atan2(dy, dx);
}
// --- Helper: Find nearest t on path to (x, y) ---
function findNearestT(x, y) {
	// Brute force for MVP
	var minDist = 1e9;
	var minIdx = 0;
	for (var i = 0; i < PATH_POINTS.length; i += 8) {
		// Step for speed
		var p = PATH_POINTS[i];
		var dx = p.x - x;
		var dy = p.y - y;
		var d = dx * dx + dy * dy;
		if (d < minDist) {
			minDist = d;
			minIdx = i;
		}
	}
	return minIdx / (PATH_LENGTH - 1);
}
// --- Game Events ---
// Aim shooter
game.move = function (x, y, obj) {
	if (!isAiming) return;
	var angle = getShooterAngleTo(x, y);
	shooter.setAngle(angle);
	updateShooterGuide();
};
// Start aiming
game.down = function (x, y, obj) {
	// Only allow aiming if touch is not on top 400px (avoid accidental shots)
	if (y < 400) return;
	isAiming = true;
	var angle = getShooterAngleTo(x, y);
	shooter.setAngle(angle);
	updateShooterGuide();
};
// Shoot ball
game.up = function (x, y, obj) {
	if (!isAiming) return;
	isAiming = false;
	updateShooterGuide();
	// Fire a ball in the current shooter.angle
	var ball = new Ball();
	ball.isChain = false;
	ball.setColor(nextBallColor);
	var angle = shooter.angle;
	var speed = 68; // px per tick (even faster for shooter)
	ball.vx = Math.cos(angle) * speed;
	ball.vy = Math.sin(angle) * speed;
	ball.x = shooter.x + Math.cos(angle) * 60;
	ball.y = shooter.y + Math.sin(angle) * 60;
	ball.active = true;
	shotBalls.push(ball);
	game.addChild(ball);
	// Play shoot sound
	LK.getSound('shoot').play();
	// Next ball color
	nextBallColor = colors[Math.floor(Math.random() * colors.length)];
	shooter.setPreviewColor(nextBallColor);
};
// --- Helper: Insert ball into chain at index ---
function insertBallIntoChain(ball, insertIdx, insertT) {
	// Insert ball into chainBalls at insertIdx, set t=insertT
	ball.isChain = true;
	ball.t = insertT;
	ball.chainIndex = insertIdx;
	// Remove from shotBalls
	for (var i = 0; i < shotBalls.length; i++) {
		if (shotBalls[i] === ball) {
			shotBalls.splice(i, 1);
			break;
		}
	}
	// Insert into chainBalls
	chainBalls.splice(insertIdx, 0, ball);
	// Re-index and re-t
	for (var i = 0; i < chainBalls.length; i++) {
		chainBalls[i].chainIndex = i;
	}
	// Adjust t for all balls after insertIdx
	for (var i = insertIdx + 1; i < chainBalls.length; i++) {
		chainBalls[i].t += chainSpacing / SPIRAL_RADIUS / (SPIRAL_TURNS * 2 * Math.PI);
	}
}
// --- Helper: Check for matches and pop balls ---
// Only pop the run that contains the most recently inserted ball (if any)
function checkAndPopMatches(insertedBall) {
	// If no insertedBall is provided, fallback to old behavior (should not happen in normal flow)
	if (!insertedBall) {
		// fallback: do nothing
		return false;
	}
	// Find the run containing insertedBall
	var idx = chainBalls.indexOf(insertedBall);
	if (idx === -1) return false;
	var color = insertedBall.color;
	// Expand left
	var left = idx;
	while (left > 0 && chainBalls[left - 1].color === color) {
		left--;
	}
	// Expand right
	var right = idx;
	while (right < chainBalls.length - 1 && chainBalls[right + 1].color === color) {
		right++;
	}
	var runLen = right - left + 1;
	if (runLen >= 3) {
		// Pop balls left to right
		for (var k = left; k <= right; k++) {
			var b = chainBalls[k];
			// Animate pop
			tween(b, {
				scaleX: 1.5,
				scaleY: 1.5,
				alpha: 0
			}, {
				duration: 220,
				easing: tween.easeOut,
				onFinish: function (ball) {
					return function () {
						ball.destroy();
					};
				}(b)
			});
		}
		// Remove from chainBalls
		chainBalls.splice(left, runLen);
		// Play pop sound
		LK.getSound('pop').play();
		// Update score
		score += runLen * 10;
		scoreTxt.setText(score);
		// Re-index and re-t
		for (var m = 0; m < chainBalls.length; m++) {
			chainBalls[m].chainIndex = m;
		}
		// After popping, check again for the new ball at left (if any)
		// But only if a new run is formed at the pop location
		// Recursively check for new matches at the pop location
		if (chainBalls[left]) {
			return checkAndPopMatches(chainBalls[left]);
		}
		return true;
	}
	return false;
}
// --- Game Update Loop ---
game.update = function () {
	// --- Move chain balls forward ---
	if (chainBalls.length > 0) {
		// Move head forward
		chainHeadT += chainSpeed;
		// Clamp
		if (chainHeadT > 1) chainHeadT = 1;
		// --- Maintain constant spacing between balls along the path ---
		// Compute arc length between balls using the precomputed arcLen array
		// Find the arcLen for the head
		var HIGH_RES = 6000;
		var arcLen = [0];
		for (var i = 1; i < PATH_POINTS.length; i++) {
			var dx = PATH_POINTS[i].x - PATH_POINTS[i - 1].x;
			var dy = PATH_POINTS[i].y - PATH_POINTS[i - 1].y;
			arcLen[i] = arcLen[i - 1] + Math.sqrt(dx * dx + dy * dy);
		}
		var totalLen = arcLen[arcLen.length - 1];
		// Find the t for the head
		var headT = chainHeadT;
		var headIdx = Math.floor(headT * (PATH_LENGTH - 1));
		var headArc = arcLen[headIdx];
		// Now, for each ball, set its t so that the arc length between balls is always chainSpacing
		for (var i = 0; i < chainBalls.length; i++) {
			// The arc length for this ball should be headArc + i * chainSpacing
			var targetArc = headArc + i * chainSpacing;
			// Clamp to totalLen
			if (targetArc > totalLen) targetArc = totalLen;
			// Binary search for t such that arcLen[idx] >= targetArc
			var lo = 0,
				hi = arcLen.length - 1;
			while (lo < hi) {
				var mid = Math.floor((lo + hi) / 2);
				if (arcLen[mid] < targetArc) lo = mid + 1;else hi = mid;
			}
			var idx = lo;
			var t = idx / (PATH_LENGTH - 1);
			chainBalls[i].t = t;
			var pos = getPathPos(t);
			chainBalls[i].x = pos.x;
			chainBalls[i].y = pos.y;
		}
		chainTailT = chainBalls.length > 0 ? chainBalls[chainBalls.length - 1].t : 0;
	}
	// --- Move shot balls ---
	for (var i = shotBalls.length - 1; i >= 0; i--) {
		var ball = shotBalls[i];
		if (!ball.active) continue;
		ball.x += ball.vx;
		ball.y += ball.vy;
		// Out of bounds
		if (ball.x < -100 || ball.x > 2148 || ball.y < -100 || ball.y > 2832) {
			ball.destroy();
			shotBalls.splice(i, 1);
			continue;
		}
		// --- Collision with chain balls ---
		var minDist = 1e9;
		var hitIdx = -1;
		var hitT = 0;
		for (var j = 0; j < chainBalls.length; j++) {
			var cb = chainBalls[j];
			var dx = ball.x - cb.x;
			var dy = ball.y - cb.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < ball.radius * 1.15) {
				if (dist < minDist) {
					minDist = dist;
					hitIdx = j;
					// Find t between cb and previous/next
					if (j === 0) {
						hitT = cb.t - chainSpacing / SPIRAL_RADIUS / (SPIRAL_TURNS * 2 * Math.PI);
					} else {
						hitT = (cb.t + chainBalls[j - 1].t) / 2;
					}
				}
			}
		}
		if (hitIdx !== -1) {
			// Insert ball into chain at hitIdx
			insertBallIntoChain(ball, hitIdx, hitT);
			// Animate insertion
			tween(ball, {
				scaleX: 1.2,
				scaleY: 1.2
			}, {
				duration: 80,
				onFinish: function onFinish() {
					tween(ball, {
						scaleX: 1,
						scaleY: 1
					}, {
						duration: 80
					});
				}
			});
			// After insertion, check for matches ONLY for the inserted ball
			checkAndPopMatches(ball);
			continue;
		}
	}
	// --- Check for game over (tail reaches end) ---
	if (chainBalls.length > 0 && chainBalls[chainBalls.length - 1].t >= 1) {
		// Flash screen red
		LK.effects.flashScreen(0xff0000, 1000);
		LK.showGameOver();
		return;
	}
	// --- Check for win (all balls popped) ---
	if (chainBalls.length === 0) {
		LK.showYouWin();
		return;
	}
};
// --- Increase difficulty over time --- 
var difficultyTimer = LK.setInterval(function () {
	// Only increase speed, do not add new colors or levels
	chainSpeed += 0.00008;
}, 9000);

===================================================================
--- original.js
+++ change.js
@@ -47,9 +47,9 @@
 	var self = Container.call(this);
 	// Attach shooter asset
 	var shooterAsset = self.attachAsset('shooter', {
 		anchorX: 0.5,
-		anchorY: 0.5,
+		anchorY: 1,
 		scaleX: 2.7,
 		scaleY: 2.7
 	});
 	// The ball to be shot (preview)
@@ -211,16 +211,15 @@
 var shooter = new Shooter();
 // Place shooter so its center aligns with the start of the guide line (spiral center)
 var shooterAssetSize = LK.getAsset('shooter', {
 	anchorX: 0.5,
-	anchorY: 0.5,
+	anchorY: 1,
 	scaleX: 2.7,
 	scaleY: 2.7
 });
 shooter.x = PATH_CENTER_X;
-// Place shooter so its bottom (not center) is at the spiral center
-var shooterAssetHeight = shooterAssetSize.height * 2.7; // scaleY
-shooter.y = PATH_CENTER_Y + shooterAssetHeight / 2;
+// Place shooter so its bottom is at the spiral center (anchorY:1 means y is at bottom)
+shooter.y = PATH_CENTER_Y;
 game.addChild(shooter);
 // --- Shooter Guide Line ---
 // We'll use a series of small dots (like spiralPathDots) to show the aim direction
 var shooterGuideDots = new Container();