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

/**** 
* Classes
****/ 
// Defender class (moves horizontally)
var Defender = Container.expand(function () {
	var self = Container.call(this);
	// Attach defender asset (rectangle, blue)
	var defender = self.attachAsset('defender', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = defender.width;
	self.height = defender.height;
	// Movement
	self.speed = 8 + Math.random() * 6;
	self.direction = Math.random() > 0.5 ? 1 : -1;
	// For collision
	self.left = function () {
		return self.x - self.width / 2;
	};
	self.right = function () {
		return self.x + self.width / 2;
	};
	self.top = function () {
		return self.y - self.height / 2;
	};
	self.bottom = function () {
		return self.y + self.height / 2;
	};
	self.update = function () {
		self.x += self.speed * self.direction;
		// Bounce at edges
		if (self.x < 300 + self.width / 2) {
			self.x = 300 + self.width / 2;
			self.direction *= -1;
		}
		if (self.x > 2048 - 300 - self.width / 2) {
			self.x = 2048 - 300 - self.width / 2;
			self.direction *= -1;
		}
	};
	return self;
});
// Goal class
var Goal = Container.expand(function () {
	var self = Container.call(this);
	// Attach goal asset (rectangle, yellow)
	var goal = self.attachAsset('goal', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set size
	self.width = goal.width;
	self.height = goal.height;
	// For collision
	self.left = function () {
		return self.x - self.width / 2;
	};
	self.right = function () {
		return self.x + self.width / 2;
	};
	self.top = function () {
		return self.y - self.height / 2;
	};
	self.bottom = function () {
		return self.y + self.height / 2;
	};
	return self;
});
// Obstacle class (static)
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	// Attach obstacle asset (ellipse, gray)
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = obs.width / 2;
	return self;
});
// Soccer Ball class
var SoccerBall = Container.expand(function () {
	var self = Container.call(this);
	// Attach ball asset (ellipse, white)
	var ball = self.attachAsset('soccerBall', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Ball state
	self.isMoving = false;
	self.vx = 0;
	self.vy = 0;
	// Ball radius for collision
	self.radius = ball.width / 2;
	// Reset ball to center
	self.reset = function () {
		self.x = 2048 / 2;
		self.y = 2732 - 400;
		self.vx = 0;
		self.vy = 0;
		self.isMoving = false;
	};
	// Update ball position
	self.update = function () {
		// Track lastY for transition detection
		if (self.lastY === undefined) self.lastY = self.y;
		if (self.isMoving) {
			self.x += self.vx;
			self.y += self.vy;
			// Friction
			self.vx *= 0.98;
			self.vy *= 0.98;
			// If ball crosses half field (y < 1366) for the first time, lose control and send it out
			if (self.lastY >= 1366 && self.y < 1366 && self.isMoving) {
				// Ball loses control: set a strong upward velocity and disable flicking
				self.vx = 0;
				self.vy = -40;
				canFlick = false;
				isDragging = false;
			}
			// Stop if very slow
			if (Math.abs(self.vx) < 1 && Math.abs(self.vy) < 1) {
				self.vx = 0;
				self.vy = 0;
				self.isMoving = false;
			}
		}
		self.lastY = self.y;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a7a2e // Green soccer field
});

/**** 
* Game Code
****/ 
// Game variables
// Tween for animations
// Asset initialization
var ball;
var goal;
var defenders = [];
var obstacles = [];
var score = 0;
var timeLeft = 30; // seconds
var isDragging = false;
var dragStart = {
	x: 0,
	y: 0
};
var dragEnd = {
	x: 0,
	y: 0
};
var canFlick = true;
var timerInterval;
var scoreTxt;
var timerTxt;
var lastGoal = false;
var lastMiss = false;
var gameActive = true;
// Add goal at top center
goal = new Goal();
goal.x = 2048 / 2;
goal.y = 220;
game.addChild(goal);
// Add ball at bottom center
ball = new SoccerBall();
ball.reset();
game.addChild(ball);
// Add defenders (start with 1, increase as score increases)
function spawnDefenders(num) {
	// Remove old defenders
	for (var i = 0; i < defenders.length; i++) {
		defenders[i].destroy();
	}
	defenders = [];
	for (var i = 0; i < num; i++) {
		var d = new Defender();
		d.x = 2048 / 2 + (i - (num - 1) / 2) * 350;
		d.y = goal.y + 220 + i * 60;
		game.addChild(d);
		defenders.push(d);
	}
}
spawnDefenders(1);
// Add obstacles (static, increase as score increases)
function spawnObstacles(num) {
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].destroy();
	}
	obstacles = [];
	for (var i = 0; i < num; i++) {
		var obs = new Obstacle();
		obs.x = 2048 / 2 + (i - (num - 1) / 2) * 250;
		obs.y = 1200 + i * 120;
		game.addChild(obs);
		obstacles.push(obs);
	}
}
spawnObstacles(0);
// Score text
scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFF700
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Timer text
timerTxt = new Text2('30', {
	size: 100,
	fill: 0xFFFFFF
});
timerTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(timerTxt);
// Timer logic
function startTimer() {
	timeLeft = 30;
	timerTxt.setText(timeLeft);
	if (timerInterval) LK.clearInterval(timerInterval);
	timerInterval = LK.setInterval(function () {
		if (!gameActive) return;
		timeLeft -= 1;
		if (timeLeft < 0) timeLeft = 0;
		timerTxt.setText(timeLeft);
		if (timeLeft <= 0) {
			endGame();
		}
	}, 1000);
}
startTimer();
// End game
function endGame() {
	gameActive = false;
	canFlick = false;
	LK.effects.flashScreen(0x000000, 800);
	LK.showGameOver();
}
// Flick controls
game.down = function (x, y, obj) {
	if (!gameActive) return;
	// Only allow flick if ball is not moving and touch is near ball
	var dx = x - ball.x;
	var dy = y - ball.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (!ball.isMoving && dist < ball.radius + 40 && canFlick) {
		isDragging = true;
		dragStart.x = x;
		dragStart.y = y;
		dragEnd.x = x;
		dragEnd.y = y;
	}
};
game.move = function (x, y, obj) {
	if (!gameActive) return;
	if (isDragging) {
		dragEnd.x = x;
		dragEnd.y = y;
		// Move the ball to the finger position while dragging
		ball.x = x;
		ball.y = y;
	}
};
game.up = function (x, y, obj) {
	if (!gameActive) return;
	if (isDragging) {
		isDragging = false;
		// Calculate flick vector
		var dx = dragEnd.x - dragStart.x;
		var dy = dragEnd.y - dragStart.y;
		// Only flick if drag is upwards and long enough
		if (dy < -60) {
			// Flick strength
			var strength = Math.min(Math.sqrt(dx * dx + dy * dy), 900);
			var angle = Math.atan2(dy, dx);
			// Set ball velocity
			ball.vx = Math.cos(angle) * (strength / 18);
			ball.vy = Math.sin(angle) * (strength / 18);
			ball.isMoving = true;
			canFlick = false;
		}
	}
};
// Main update loop
game.update = function () {
	if (!gameActive) return;
	// Ball update
	ball.update();
	// Defenders update
	for (var i = 0; i < defenders.length; i++) {
		defenders[i].update();
	}
	// Check collisions with defenders
	if (ball.isMoving) {
		for (var i = 0; i < defenders.length; i++) {
			var d = defenders[i];
			if (ball.x + ball.radius > d.left() && ball.x - ball.radius < d.right() && ball.y + ball.radius > d.top() && ball.y - ball.radius < d.bottom()) {
				// Hit defender: miss
				if (!lastMiss) {
					lastMiss = true;
					LK.effects.flashObject(ball, 0xff0000, 500);
					tween(ball, {
						x: ball.x,
						y: ball.y
					}, {
						duration: 200,
						onFinish: function onFinish() {
							ball.reset();
							canFlick = true;
							lastMiss = false;
						}
					});
				}
				return;
			}
		}
	}
	// Check collisions with obstacles
	if (ball.isMoving) {
		for (var i = 0; i < obstacles.length; i++) {
			var obs = obstacles[i];
			var dx = ball.x - obs.x;
			var dy = ball.y - obs.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < ball.radius + obs.radius) {
				// Hit obstacle: miss
				if (!lastMiss) {
					lastMiss = true;
					LK.effects.flashObject(ball, 0xff0000, 500);
					tween(ball, {
						x: ball.x,
						y: ball.y
					}, {
						duration: 200,
						onFinish: function onFinish() {
							ball.reset();
							canFlick = true;
							lastMiss = false;
						}
					});
				}
				return;
			}
		}
	}
	// Check if ball enters goal
	if (ball.isMoving) {
		if (ball.y - ball.radius < goal.bottom() && ball.x > goal.left() + 40 && ball.x < goal.right() - 40) {
			// Goal!
			if (!lastGoal) {
				lastGoal = true;
				score += 1;
				LK.setScore(score);
				scoreTxt.setText(score);
				LK.effects.flashObject(goal, 0x00ff00, 400);
				// Animate ball into goal
				tween(ball, {
					y: goal.y
				}, {
					duration: 180,
					onFinish: function onFinish() {
						ball.reset();
						canFlick = true;
						lastGoal = false;
					}
				});
				// Increase difficulty for up to 50 levels
				// Level progression: every 2 goals, add a defender (up to 6), every 5 goals, add an obstacle (up to 6)
				var defendersToSpawn = 1 + Math.floor(score / 2);
				if (defendersToSpawn > 6) defendersToSpawn = 6;
				var obstaclesToSpawn = Math.floor(score / 5);
				if (obstaclesToSpawn > 6) obstaclesToSpawn = 6;
				// Only update defenders/obstacles when reaching a new level
				if (score > 0 && score <= 50) {
					if (score % 2 === 0 && defenders.length !== defendersToSpawn) {
						spawnDefenders(defendersToSpawn);
					}
					if (score % 5 === 0 && obstacles.length !== obstaclesToSpawn) {
						spawnObstacles(obstaclesToSpawn);
					}
				}
			}
			return;
		}
	}
	// If ball goes out of bounds (top, bottom, sides)
	if (ball.x < -100 || ball.x > 2048 + 100 || ball.y < -100 || ball.y > 2732 + 100) {
		if (!lastMiss) {
			lastMiss = true;
			LK.effects.flashObject(ball, 0xff0000, 500);
			tween(ball, {
				x: 2048 / 2,
				y: 2732 - 400
			}, {
				duration: 200,
				onFinish: function onFinish() {
					ball.reset();
					canFlick = true;
					lastMiss = false;
				}
			});
		}
		return;
	}
};
// Reset game state on game over
game.on('destroy', function () {
	if (timerInterval) LK.clearInterval(timerInterval);
	defenders = [];
	obstacles = [];
	score = 0;
	timeLeft = 30;
	isDragging = false;
	canFlick = true;
	lastGoal = false;
	lastMiss = false;
	gameActive = true;
});
// Play again: reset everything
game.on('restart', function () {
	ball.reset();
	score = 0;
	LK.setScore(0);
	scoreTxt.setText(0);
	timeLeft = 30;
	timerTxt.setText(timeLeft);
	spawnDefenders(1);
	spawnObstacles(0);
	canFlick = true;
	lastGoal = false;
	lastMiss = false;
	gameActive = true;
	startTimer();
});

===================================================================
--- original.js
+++ change.js
@@ -106,21 +106,32 @@
 		self.isMoving = false;
 	};
 	// Update ball position
 	self.update = function () {
+		// Track lastY for transition detection
+		if (self.lastY === undefined) self.lastY = self.y;
 		if (self.isMoving) {
 			self.x += self.vx;
 			self.y += self.vy;
 			// Friction
 			self.vx *= 0.98;
 			self.vy *= 0.98;
+			// If ball crosses half field (y < 1366) for the first time, lose control and send it out
+			if (self.lastY >= 1366 && self.y < 1366 && self.isMoving) {
+				// Ball loses control: set a strong upward velocity and disable flicking
+				self.vx = 0;
+				self.vy = -40;
+				canFlick = false;
+				isDragging = false;
+			}
 			// Stop if very slow
 			if (Math.abs(self.vx) < 1 && Math.abs(self.vy) < 1) {
 				self.vx = 0;
 				self.vy = 0;
 				self.isMoving = false;
 			}
 		}
+		self.lastY = self.y;
 	};
 	return self;
 });