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

/**** 
* Classes
****/ 
// Ball class
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballSprite = self.attachAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Ball physics
	self.vx = 0;
	self.vy = 0;
	self.friction = 1; // Friction for instant stopping
	self.update = function () {
		// Move ball
		// Store lastX/lastY for physics and event triggers
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		self.lastX = self.x;
		self.lastY = self.y;
		self.x += self.vx;
		self.y += self.vy;
		// Friction
		self.vx *= self.friction;
		self.vy *= self.friction;
		// Clamp very small velocities to zero
		if (Math.abs(self.vx) < 0.1) self.vx = 0;
		if (Math.abs(self.vy) < 0.1) self.vy = 0;
		// Bounce off field boundaries
		// Left/right
		if (self.x - ballSprite.width / 2 < fieldLeft) {
			self.x = fieldLeft + ballSprite.width / 2;
			self.vx = -self.vx * 0.7;
		}
		if (self.x + ballSprite.width / 2 > fieldRight) {
			self.x = fieldRight - ballSprite.width / 2;
			self.vx = -self.vx * 0.7;
		}
		// Top/bottom (except inside goal area)
		if (self.y - ballSprite.height / 2 < fieldTop) {
			self.y = fieldTop + ballSprite.height / 2;
			self.vy = -self.vy * 0.7;
		}
		if (self.y + ballSprite.height / 2 > fieldBottom) {
			self.y = fieldBottom - ballSprite.height / 2;
			self.vy = -self.vy * 0.7;
		}
	};
	return self;
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	// Set in init
	self.isAI = false;
	self.playerNum = 1; // 1 or 2
	// Attach asset
	var assetId = self.playerNum === 1 ? 'player1' : 'player2';
	var playerSprite = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For drag
	self.isDragging = false;
	// For AI
	self.targetX = 0;
	self.targetY = 0;
	// For collision
	self.radius = playerSprite.width / 2;
	// For touch events (only for player 1)
	self.down = function (x, y, obj) {
		if (!self.isAI) {
			self.isDragging = true;
		}
	};
	self.up = function (x, y, obj) {
		if (!self.isAI) {
			self.isDragging = false;
		}
	};
	self.update = function () {
		// AI movement
		if (self.isAI) {
			// Find nearest ball
			var nearestBall = null;
			var minDist = Infinity;
			for (var i = 0; i < balls.length; i++) {
				var bx = balls[i].x;
				var by = balls[i].y;
				var d = Math.sqrt((self.x - bx) * (self.x - bx) + (self.y - by) * (self.y - by));
				if (d < minDist) {
					minDist = d;
					nearestBall = balls[i];
				}
			}
			// If no balls, just stay at home
			var target = {
				x: self.homeX,
				y: self.homeY
			};
			if (nearestBall) {
				target.x = nearestBall.x;
				target.y = nearestBall.y;
				// Only chase if ball is on own half
				var ownHalf = self.playerNum === 2 ? nearestBall.y > fieldCenterY : nearestBall.y < fieldCenterY;
				if (!ownHalf) {
					// Stay at home position
					target.x = self.homeX;
					target.y = self.homeY;
				}
			}
			// Move towards target
			var dx = target.x - self.x;
			var dy = target.y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			var speed = 18;
			if (dist > 10) {
				self.x += dx / dist * speed;
				self.y += dy / dist * speed;
			}
		}
		// Clamp inside field
		if (self.x - self.radius < fieldLeft) self.x = fieldLeft + self.radius;
		if (self.x + self.radius > fieldRight) self.x = fieldRight - self.radius;
		if (self.y - self.radius < fieldTop) self.y = fieldTop + self.radius;
		if (self.y + self.radius > fieldBottom) self.y = fieldBottom - self.radius;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1b5e20
});

/**** 
* Game Code
****/ 
// Sound for goal
// Goal area (yellow rectangle)
// Player 2 (red circle)
// Player 1 (blue circle)
// Ball (white circle)
// Football field (green rectangle)
// Field dimensions
var fieldWidth = 1800;
var fieldHeight = 2600;
var fieldLeft = (2048 - fieldWidth) / 2;
var fieldTop = (2732 - fieldHeight) / 2;
var fieldRight = fieldLeft + fieldWidth;
var fieldBottom = fieldTop + fieldHeight;
var fieldCenterX = 2048 / 2;
var fieldCenterY = 2732 / 2;
// Add field
var field = LK.getAsset('field', {
	anchorX: 0,
	anchorY: 0,
	x: fieldLeft,
	y: fieldTop
});
game.addChild(field);
// Add goals
var goalWidth = 600;
var goalHeight = 60;
var goal1 = LK.getAsset('goal', {
	anchorX: 0.5,
	anchorY: 0,
	x: fieldCenterX,
	y: fieldTop - goalHeight + 10 // Slightly inside field
});
var goal2 = LK.getAsset('goal', {
	anchorX: 0.5,
	anchorY: 1,
	x: fieldCenterX,
	y: fieldBottom - 10 // Slightly inside field
});
game.addChild(goal1);
game.addChild(goal2);
// Add balls array and spawn function
var balls = [];
function spawnBall() {
	if (balls.length >= 10) return;
	var newBall = new Ball();
	// Place ball at center, but match its sprite's anchor and size
	var ballSprite = LK.getAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	newBall.x = fieldCenterX;
	newBall.y = fieldCenterY;
	// Set velocity to zero
	newBall.vx = 0;
	newBall.vy = 0;
	// Initialize lastX/lastY for correct physics
	newBall.lastX = newBall.x;
	newBall.lastY = newBall.y;
	balls.push(newBall);
	game.addChild(newBall);
}
// Initial ball
spawnBall();
// Ball spawn timer
var ballSpawnTimer = LK.setInterval(function () {
	spawnBall();
}, 7000);
// Add players
var player1 = new Player();
player1.playerNum = 1;
player1.x = fieldCenterX;
player1.y = fieldTop + 400;
player1.homeX = player1.x;
player1.homeY = player1.y;
game.addChild(player1);
var player2 = new Player();
player2.playerNum = 2;
player2.isAI = true;
player2.x = fieldCenterX;
player2.y = fieldBottom - 400;
player2.homeX = player2.x;
player2.homeY = player2.y;
game.addChild(player2);
// Ball start position
function resetBall(kickoffToPlayer) {
	for (var i = 0; i < balls.length; i++) {
		balls[i].x = fieldCenterX;
		balls[i].y = fieldCenterY;
		balls[i].vx = 0;
		balls[i].vy = 0;
		// Give a little nudge towards the player who conceded
		if (kickoffToPlayer === 1) {
			balls[i].vy = -18;
		} else if (kickoffToPlayer === 2) {
			balls[i].vy = 18;
		}
	}
}
// Score
var score1 = 0;
var score2 = 0;
// Score display
var scoreTxt = new Text2('0 : 0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Timer
var gameTime = 60; // seconds
var timeLeft = gameTime;
var timerTxt = new Text2('01:00', {
	size: 80,
	fill: "#fff"
});
timerTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(timerTxt);
timerTxt.y = 130;
// Timer interval
var timerInterval = LK.setInterval(function () {
	timeLeft--;
	if (timeLeft < 0) timeLeft = 0;
	var min = Math.floor(timeLeft / 60);
	var sec = timeLeft % 60;
	var secStr = sec < 10 ? '0' + sec : '' + sec;
	timerTxt.setText('0' + min + ':' + secStr);
	if (timeLeft === 0) {
		// End game
		if (score1 > score2) {
			LK.showYouWin();
		} else if (score2 > score1) {
			LK.showGameOver();
		} else {
			// Draw: treat as loss for now
			LK.showGameOver();
		}
	}
}, 1000);
// Dragging
var dragNode = null;
function handleMove(x, y, obj) {
	if (dragNode && !dragNode.isAI) {
		// Clamp to field
		var r = dragNode.radius;
		var nx = x;
		var ny = y;
		if (nx - r < fieldLeft) nx = fieldLeft + r;
		if (nx + r > fieldRight) nx = fieldRight - r;
		if (ny - r < fieldTop) ny = fieldTop + r;
		if (ny + r > fieldBottom) ny = fieldBottom - r;
		dragNode.x = nx;
		dragNode.y = ny;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only allow drag if touch is inside player1
	var dx = x - player1.x;
	var dy = y - player1.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (dist < player1.radius) {
		dragNode = player1;
		player1.isDragging = true;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	if (dragNode) {
		dragNode.isDragging = false;
		dragNode = null;
	}
};
// Helper: circle-circle collision
function circlesCollide(ax, ay, ar, bx, by, br) {
	var dx = ax - bx;
	var dy = ay - by;
	var dist = Math.sqrt(dx * dx + dy * dy);
	return dist < ar + br - 2;
}
// Helper: reflect ball off player (now supports passing ball as argument)
function reflectBallFromPlayer(player, b) {
	if (!b) b = ball;
	var dx = b.x - player.x;
	var dy = b.y - player.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (dist === 0) return;
	// Place ball just outside player
	var overlap = player.radius + 45 - dist;
	if (overlap > 0) {
		b.x += dx / dist * overlap;
		b.y += dy / dist * overlap;
	}
	// Ball velocity: add a kick
	var kickPower = 22;
	var normx = dx / dist;
	var normy = dy / dist;
	// If player is moving (drag), add some extra
	var extraVx = 0,
		extraVy = 0;
	if (!player.isAI && player.isDragging && dragNode === player) {
		// Use move delta (not available, so skip for now)
	}
	// Set ball velocity
	b.vx = normx * kickPower + extraVx;
	b.vy = normy * kickPower + extraVy;
}
// Helper: check goal (now supports passing ball and index)
function checkGoal(b, idx) {
	if (!b) b = ball;
	// Top goal (player 2's goal)
	if (b.y - 45 < fieldTop + 10 && b.x > fieldCenterX - goalWidth / 2 && b.x < fieldCenterX + goalWidth / 2) {
		// Player 1 scores
		score1++;
		scoreTxt.setText(score1 + ' : ' + score2);
		LK.getSound('goal').play();
		LK.effects.flashScreen(0x1976d2, 600);
		// Remove ball and respawn if needed
		if (typeof idx === "number") {
			b.destroy();
			balls.splice(idx, 1);
			// Always keep at least 1 ball
			if (balls.length === 0) spawnBall();
		}
		// Win condition
		if (score1 >= 5) {
			LK.showYouWin();
		}
		return;
	}
	// Bottom goal (player 1's goal)
	if (b.y + 45 > fieldBottom - 10 && b.x > fieldCenterX - goalWidth / 2 && b.x < fieldCenterX + goalWidth / 2) {
		// Player 2 scores
		score2++;
		scoreTxt.setText(score1 + ' : ' + score2);
		LK.getSound('goal').play();
		LK.effects.flashScreen(0xd32f2f, 600);
		if (typeof idx === "number") {
			b.destroy();
			balls.splice(idx, 1);
			if (balls.length === 0) spawnBall();
		}
		if (score2 >= 5) {
			LK.showGameOver();
		}
		return;
	}
}
// Main update loop
game.update = function () {
	// Update players
	player1.update();
	player2.update();
	// Update all balls
	for (var i = balls.length - 1; i >= 0; i--) {
		var b = balls[i];
		b.update();
		// Player-ball collisions
		if (circlesCollide(player1.x, player1.y, player1.radius, b.x, b.y, 45)) {
			reflectBallFromPlayer(player1, b);
		}
		if (circlesCollide(player2.x, player2.y, player2.radius, b.x, b.y, 45)) {
			reflectBallFromPlayer(player2, b);
		}
	}
	// Ball-ball collision and response
	for (var i = 0; i < balls.length; i++) {
		var a = balls[i];
		for (var j = i + 1; j < balls.length; j++) {
			var b = balls[j];
			// Both balls have radius 45
			var dx = a.x - b.x;
			var dy = a.y - b.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			var minDist = 45 + 45 - 2;
			if (dist < minDist && dist > 0) {
				// Move balls apart
				var overlap = minDist - dist;
				var nx = dx / dist;
				var ny = dy / dist;
				a.x += nx * overlap / 2;
				a.y += ny * overlap / 2;
				b.x -= nx * overlap / 2;
				b.y -= ny * overlap / 2;
				// Exchange velocities (simple elastic collision)
				// Project velocities onto collision normal
				var va = a.vx * nx + a.vy * ny;
				var vb = b.vx * nx + b.vy * ny;
				// Swap the normal components
				var vaNew = vb;
				var vbNew = va;
				// Tangential components stay the same
				var vat = -a.vx * ny + a.vy * nx;
				var vbt = -b.vx * ny + b.vy * nx;
				// Recompose velocities
				a.vx = vaNew * nx - vat * ny;
				a.vy = vaNew * ny + vat * nx;
				b.vx = vbNew * nx - vbt * ny;
				b.vy = vbNew * ny + vbt * nx;
			}
		}
	}
	// Prevent players from overlapping
	var dx = player1.x - player2.x;
	var dy = player1.y - player2.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	var minDist = player1.radius + player2.radius - 8;
	if (dist < minDist && dist > 0) {
		var overlap = minDist - dist;
		var nx = dx / dist;
		var ny = dy / dist;
		// Push both away from each other
		player1.x += nx * overlap / 2;
		player1.y += ny * overlap / 2;
		player2.x -= nx * overlap / 2;
		player2.y -= ny * overlap / 2;
	}
	// Check for goals for all balls
	for (var i = balls.length - 1; i >= 0; i--) {
		checkGoal(balls[i], i);
	}
	// --- Stuck detection and reset ---
	// Consider stuck if all balls and both players have not moved significantly for 2 seconds
	if (typeof stuckState === "undefined") {
		stuckState = {
			lastPositions: [],
			lastPlayer1: {
				x: player1.x,
				y: player1.y
			},
			lastPlayer2: {
				x: player2.x,
				y: player2.y
			},
			lastCheck: Date.now(),
			stuckTime: 0
		};
	}
	var allStill = true;
	for (var i = 0; i < balls.length; i++) {
		var b = balls[i];
		if (!stuckState.lastPositions[i]) stuckState.lastPositions[i] = {
			x: b.x,
			y: b.y
		};
		var dx = b.x - stuckState.lastPositions[i].x;
		var dy = b.y - stuckState.lastPositions[i].y;
		if (Math.abs(dx) > 2 || Math.abs(dy) > 2) {
			allStill = false;
		}
	}
	var p1dx = player1.x - stuckState.lastPlayer1.x;
	var p1dy = player1.y - stuckState.lastPlayer1.y;
	var p2dx = player2.x - stuckState.lastPlayer2.x;
	var p2dy = player2.y - stuckState.lastPlayer2.y;
	if (Math.abs(p1dx) > 2 || Math.abs(p1dy) > 2 || Math.abs(p2dx) > 2 || Math.abs(p2dy) > 2) {
		allStill = false;
	}
	var now = Date.now();
	if (allStill) {
		stuckState.stuckTime += now - stuckState.lastCheck;
		if (stuckState.stuckTime > 2000) {
			// Reset all balls to center
			resetBall();
			stuckState.stuckTime = 0;
			// Also flash screen to indicate reset
			LK.effects.flashScreen(0xff9800, 500);
		}
	} else {
		stuckState.stuckTime = 0;
	}
	// Update last positions and time
	for (var i = 0; i < balls.length; i++) {
		if (!stuckState.lastPositions[i]) stuckState.lastPositions[i] = {
			x: balls[i].x,
			y: balls[i].y
		};
		stuckState.lastPositions[i].x = balls[i].x;
		stuckState.lastPositions[i].y = balls[i].y;
	}
	stuckState.lastPlayer1.x = player1.x;
	stuckState.lastPlayer1.y = player1.y;
	stuckState.lastPlayer2.x = player2.x;
	stuckState.lastPlayer2.y = player2.y;
	stuckState.lastCheck = now;
};
// Start positions
resetBall(1);
// Play field music (if any) - not required per guidelines
// Clean up timer on game over/win
LK.on('gameover', function () {
	LK.clearInterval(timerInterval);
	LK.clearInterval(ballSpawnTimer);
});
LK.on('youwin', function () {
	LK.clearInterval(timerInterval);
	LK.clearInterval(ballSpawnTimer);
});

===================================================================
--- original.js
+++ change.js
@@ -18,8 +18,13 @@
 	self.vy = 0;
 	self.friction = 1; // Friction for instant stopping
 	self.update = function () {
 		// Move ball
+		// Store lastX/lastY for physics and event triggers
+		if (typeof self.lastX === "undefined") self.lastX = self.x;
+		if (typeof self.lastY === "undefined") self.lastY = self.y;
+		self.lastX = self.x;
+		self.lastY = self.y;
 		self.x += self.vx;
 		self.y += self.vy;
 		// Friction
 		self.vx *= self.friction;
@@ -183,12 +188,21 @@
 var balls = [];
 function spawnBall() {
 	if (balls.length >= 10) return;
 	var newBall = new Ball();
+	// Place ball at center, but match its sprite's anchor and size
+	var ballSprite = LK.getAsset('ball', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
 	newBall.x = fieldCenterX;
 	newBall.y = fieldCenterY;
+	// Set velocity to zero
 	newBall.vx = 0;
 	newBall.vy = 0;
+	// Initialize lastX/lastY for correct physics
+	newBall.lastX = newBall.x;
+	newBall.lastY = newBall.y;
 	balls.push(newBall);
 	game.addChild(newBall);
 }
 // Initial ball