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

/**** 
* Classes
****/ 
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballGraphics = self.attachAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.reset = function () {
		self.x = 2048 / 2;
		self.y = 2732 / 2;
		// Random angle between -45 and 45 degrees (avoiding too horizontal angles)
		var angle = (Math.random() * 90 - 45) * Math.PI / 180;
		// Random direction (left or right)
		if (Math.random() < 0.5) {
			angle = Math.PI - angle;
		}
		// Adjust initial speed based on difficulty
		var initialSpeed = 10; // Default (medium)
		if (typeof difficultySelector !== 'undefined') {
			switch (difficultySelector.difficulty) {
				case "easy":
					initialSpeed = 8;
					break;
				case "medium":
					initialSpeed = 10;
					break;
				case "hard":
					initialSpeed = 12;
					break;
			}
		}
		self.velocityX = Math.cos(angle) * initialSpeed;
		self.velocityY = Math.sin(angle) * initialSpeed;
		self.baseSpeed = initialSpeed;
		self.speedMultiplier = 1.0;
	};
	self.bounceFromPaddle = function (paddle, hitPosition) {
		// Calculate bounce angle based on where the ball hit the paddle
		// hitPosition is a normalized value from -1 (top) to 1 (bottom)
		var bounceAngle = hitPosition * (Math.PI / 4); // Max 45-degree angle
		// Determine direction based on which paddle was hit
		var direction = self.x < 2048 / 2 ? 1 : -1;
		// Get difficulty from selector and adjust speed increase
		var speedIncrease = 0.05; // Default (medium)
		if (difficultySelector) {
			switch (difficultySelector.difficulty) {
				case "easy":
					speedIncrease = 0.03;
					self.speedMultiplier = Math.min(self.speedMultiplier, 1.5); // Cap lower for easy
					break;
				case "medium":
					speedIncrease = 0.05;
					self.speedMultiplier = Math.min(self.speedMultiplier, 2.0); // Default cap
					break;
				case "hard":
					speedIncrease = 0.08;
					self.speedMultiplier = Math.min(self.speedMultiplier, 2.5); // Higher cap for hard
					break;
			}
		}
		// Increase speed based on difficulty
		self.speedMultiplier += speedIncrease;
		var speed = self.baseSpeed * self.speedMultiplier;
		// Set new velocity
		self.velocityX = direction * Math.cos(bounceAngle) * speed;
		self.velocityY = Math.sin(bounceAngle) * speed;
		// Play hit sound
		LK.getSound('hit').play();
	};
	self.update = function () {
		// Update position
		self.x += self.velocityX;
		self.y += self.velocityY;
		// Bounce off top and bottom walls
		if (self.y < self.height / 2 || self.y > 2732 - self.height / 2) {
			self.velocityY = -self.velocityY;
			// Keep ball in bounds
			self.y = Math.max(self.height / 2, Math.min(2732 - self.height / 2, self.y));
			// Play hit sound
			LK.getSound('hit').play();
		}
	};
	return self;
});
var DifficultySelector = Container.expand(function () {
	var self = Container.call(this);
	self.difficulty = "medium"; // Default difficulty
	// Create the container for the buttons
	var buttonsContainer = new Container();
	self.addChild(buttonsContainer);
	// Create button texts
	var easyButton = new Text2('EASY', {
		size: 70,
		fill: 0xAAAAAA
	});
	easyButton.anchor.set(0.5, 0.5);
	easyButton.x = -250;
	var mediumButton = new Text2('MEDIUM', {
		size: 70,
		fill: 0xFFFFFF
	});
	mediumButton.anchor.set(0.5, 0.5);
	mediumButton.x = 0;
	var hardButton = new Text2('HARD', {
		size: 70,
		fill: 0xAAAAAA
	});
	hardButton.anchor.set(0.5, 0.5);
	hardButton.x = 250;
	// Add buttons to container
	buttonsContainer.addChild(easyButton);
	buttonsContainer.addChild(mediumButton);
	buttonsContainer.addChild(hardButton);
	// Set interactivity
	easyButton.interactive = true;
	mediumButton.interactive = true;
	hardButton.interactive = true;
	// Event handlers
	easyButton.down = function () {
		self.setDifficulty("easy");
		easyButton.tint = 0xFFFFFF;
		mediumButton.tint = 0xAAAAAA;
		hardButton.tint = 0xAAAAAA;
	};
	mediumButton.down = function () {
		self.setDifficulty("medium");
		easyButton.tint = 0xAAAAAA;
		mediumButton.tint = 0xFFFFFF;
		hardButton.tint = 0xAAAAAA;
	};
	hardButton.down = function () {
		self.setDifficulty("hard");
		easyButton.tint = 0xAAAAAA;
		mediumButton.tint = 0xAAAAAA;
		hardButton.tint = 0xFFFFFF;
	};
	self.setDifficulty = function (level) {
		self.difficulty = level;
		// Apply difficulty settings to AI paddle
		if (aiPaddle) {
			switch (level) {
				case "easy":
					aiPaddle.difficulty = 0.4;
					aiPaddle.speed = 8;
					break;
				case "medium":
					aiPaddle.difficulty = 0.7;
					aiPaddle.speed = 12;
					break;
				case "hard":
					aiPaddle.difficulty = 0.9;
					aiPaddle.speed = 16;
					break;
			}
		}
		// Update winning score
		if (typeof updateWinningScore === 'function') {
			updateWinningScore(level);
		}
		// Reset the ball with new difficulty settings if game is in progress
		if (ball && gameActive) {
			ball.reset();
		}
		// Update difficulty display in bottom left if it exists
		if (typeof difficultyValueText !== 'undefined') {
			difficultyValueText.setText(level.toUpperCase());
		}
	};
	return self;
});
var GameStartScreen = Container.expand(function () {
	var self = Container.call(this);
	// Create a transparent overlay
	var overlay = new Container();
	self.addChild(overlay);
	// Game title
	var titleText = new Text2('PONG', {
		size: 150,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.y = -250;
	overlay.addChild(titleText);
	// Instruction text
	var instructionText = new Text2('SELECT DIFFICULTY', {
		size: 70,
		fill: 0xFFFFFF
	});
	instructionText.anchor.set(0.5, 0.5);
	instructionText.y = -100;
	overlay.addChild(instructionText);
	// Create difficulty selector for the start screen
	var startScreenSelector = null;
	self.init = function () {
		// Create difficulty selector
		startScreenSelector = new DifficultySelector();
		startScreenSelector.y = 50;
		overlay.addChild(startScreenSelector);
		// Start button
		var startButton = new Text2('START GAME', {
			size: 80,
			fill: 0xFFFFFF
		});
		startButton.anchor.set(0.5, 0.5);
		startButton.y = 200;
		startButton.interactive = true;
		startButton.down = function () {
			self.startGame(startScreenSelector.difficulty);
		};
		overlay.addChild(startButton);
	};
	self.startGame = function (difficulty) {
		// Remove start screen
		self.visible = false;
		// Start the actual game with selected difficulty
		startGame(difficulty);
	};
	// Position the overlay in the center
	overlay.x = 2048 / 2;
	overlay.y = 2732 / 2;
	return self;
});
var Paddle = Container.expand(function () {
	var self = Container.call(this);
	var paddleGraphics = self.attachAsset('paddle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 12;
	self.targetY = null;
	self.isAI = false;
	self.difficulty = 0.7; // AI difficulty - higher is better
	self.moveTowards = function (targetY) {
		self.targetY = targetY;
	};
	self.update = function () {
		if (self.targetY !== null) {
			// Move towards target position
			var distance = self.targetY - self.y;
			var moveSpeed = Math.min(Math.abs(distance), self.speed);
			if (Math.abs(distance) > 1) {
				self.y += distance > 0 ? moveSpeed : -moveSpeed;
			}
			// Constrain paddle to screen boundaries
			self.y = Math.max(self.height / 2, Math.min(2732 - self.height / 2, self.y));
		}
	};
	self.updateAI = function (ball) {
		if (!self.isAI || !ball) return;
		// AI prediction logic
		if (ball.velocityX > 0) {
			// Ball is moving toward AI
			// Predict where ball will be when it reaches AI's x position
			var timeToReach = (self.x - ball.x) / ball.velocityX;
			var predictedY = ball.y + ball.velocityY * timeToReach;
			// Add some randomness based on difficulty
			var errorAmount = (1 - self.difficulty) * 300;
			var randomError = Math.random() * errorAmount - errorAmount / 2;
			// Move towards predicted position with some error
			self.moveTowards(predictedY + randomError);
		} else {
			// When ball is moving away, move towards center with some randomness
			var centerY = 2732 / 2;
			var randomOffset = Math.random() * 100 - 50;
			self.moveTowards(centerY + randomOffset);
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var WINNING_SCORE = 10; // Default for medium, will be adjusted by difficulty
// Function to update winning score based on difficulty
function updateWinningScore(difficulty) {
	switch (difficulty) {
		case "easy":
			WINNING_SCORE = 7;
			break;
		case "medium":
			WINNING_SCORE = 10;
			break;
		case "hard":
			WINNING_SCORE = 15;
			break;
	}
}
// Game state
var playerScore = 0;
var aiScore = 0;
var lastScorer = null;
var gameActive = false;
var gameInitialized = false;
var centerLineSegments = [];
var playerPaddle, aiPaddle, ball, difficultySelector;
var playerScoreText, aiScoreText;
// Create start screen
var startScreen = new GameStartScreen();
game.addChild(startScreen);
startScreen.init();
// Initialize game elements function
function startGame(difficulty) {
	gameInitialized = true;
	// Setup score display if not already created
	if (!playerScoreText) {
		playerScoreText = new Text2('0', {
			size: 120,
			fill: 0xFFFFFF
		});
		playerScoreText.anchor.set(0.5, 0);
		playerScoreText.x = GAME_WIDTH / 4;
		playerScoreText.y = 50;
		LK.gui.addChild(playerScoreText);
		aiScoreText = new Text2('0', {
			size: 120,
			fill: 0xFFFFFF
		});
		aiScoreText.anchor.set(1, 0);
		aiScoreText.x = GAME_WIDTH - 50;
		aiScoreText.y = 50;
		LK.gui.addChild(aiScoreText);
	}
	// Create center line if not already created
	if (centerLineSegments.length === 0) {
		var LINE_SEGMENTS = 20;
		var SEGMENT_HEIGHT = GAME_HEIGHT / (LINE_SEGMENTS * 2);
		for (var i = 0; i < LINE_SEGMENTS; i++) {
			var segment = LK.getAsset('centerLine', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			segment.y = i * SEGMENT_HEIGHT * 2 + SEGMENT_HEIGHT;
			segment.x = GAME_WIDTH / 2;
			game.addChild(segment);
			centerLineSegments.push(segment);
		}
	}
	// Create difficulty selector if not already created
	if (!difficultySelector) {
		difficultySelector = new DifficultySelector();
		difficultySelector.x = GAME_WIDTH / 2;
		difficultySelector.y = 150;
		difficultySelector.visible = false; // Hide during gameplay
		LK.gui.addChild(difficultySelector);
	}
	// Create paddles if not already created
	if (!playerPaddle) {
		playerPaddle = new Paddle();
		playerPaddle.x = 80;
		playerPaddle.y = GAME_HEIGHT / 2;
		game.addChild(playerPaddle);
		aiPaddle = new Paddle();
		aiPaddle.x = GAME_WIDTH - 80;
		aiPaddle.y = GAME_HEIGHT / 2;
		aiPaddle.isAI = true;
		game.addChild(aiPaddle);
	}
	// Apply selected difficulty
	difficultySelector.setDifficulty(difficulty);
	// Create ball if not already created
	if (!ball) {
		ball = new Ball();
		game.addChild(ball);
	}
	// Reset scores at game start
	playerScore = 0;
	aiScore = 0;
	// Reset ball to start game
	ball.reset();
	// Update score displays to make sure enemy score is shown
	updateScoreDisplays();
	// Set game as active
	gameActive = true;
}
// Handle touch and mouse events
var touchActive = false;
game.down = function (x, y, obj) {
	if (gameInitialized) {
		touchActive = true;
		playerPaddle.moveTowards(y);
	}
};
game.move = function (x, y, obj) {
	if (gameInitialized && touchActive) {
		playerPaddle.moveTowards(y);
	}
};
game.up = function (x, y, obj) {
	touchActive = false;
};
// Check for paddle-ball collision
function checkPaddleCollision(paddle, ball) {
	if (ball.intersects(paddle)) {
		// Calculate hit position relative to paddle center (normalized from -1 to 1)
		var hitPosition = (ball.y - paddle.y) / (paddle.height / 2);
		hitPosition = Math.max(-1, Math.min(1, hitPosition)); // Clamp between -1 and 1
		ball.bounceFromPaddle(paddle, hitPosition);
	}
}
// Reset game after scoring
function resetAfterScore() {
	gameActive = true;
	// Reset ball with a short delay
	LK.setTimeout(function () {
		ball.reset();
		// If AI was the last scorer, give the ball initial direction toward the player
		if (lastScorer === "ai" && ball.velocityX < 0) {
			ball.velocityX = -ball.velocityX;
		}
		// If player was the last scorer, give the ball initial direction toward the AI
		else if (lastScorer === "player" && ball.velocityX > 0) {
			ball.velocityX = -ball.velocityX;
		}
	}, 1000);
}
// Create a variable for difficulty value text that will be used by difficultySelector
var difficultyValueText;
// Update score displays
function updateScoreDisplays() {
	playerScoreText.setText(playerScore.toString());
	aiScoreText.setText("0");
}
// Play background music
LK.playMusic('gameBgm');
// Game update loop
game.update = function () {
	if (!gameInitialized || !gameActive) return;
	// Update paddles
	playerPaddle.update();
	aiPaddle.updateAI(ball);
	// Update ball
	ball.update();
	// Check for paddle collisions
	checkPaddleCollision(playerPaddle, ball);
	checkPaddleCollision(aiPaddle, ball);
	// Check for scoring
	if (ball.x < 0) {
		// AI scores - no points 
		lastScorer = "ai";
		gameActive = false;
		LK.getSound('score').play();
		resetAfterScore();
	} else if (ball.x > GAME_WIDTH) {
		// Player scores
		playerScore++;
		updateScoreDisplays();
		lastScorer = "player";
		gameActive = false;
		LK.getSound('score').play();
		// Check for win
		if (playerScore >= WINNING_SCORE) {
			LK.setScore(playerScore); // Set player's score
			LK.showYouWin();
		} else {
			resetAfterScore();
		}
	}
	// Update LK score (we'll use player's score)
	LK.setScore(playerScore);
};

===================================================================
--- original.js
+++ change.js
@@ -435,9 +435,9 @@
 var difficultyValueText;
 // Update score displays
 function updateScoreDisplays() {
 	playerScoreText.setText(playerScore.toString());
-	aiScoreText.setText(aiScore.toString());
+	aiScoreText.setText("0");
 }
 // Play background music
 LK.playMusic('gameBgm');
 // Game update loop
@@ -452,21 +452,13 @@
 	checkPaddleCollision(playerPaddle, ball);
 	checkPaddleCollision(aiPaddle, ball);
 	// Check for scoring
 	if (ball.x < 0) {
-		// AI scores
-		aiScore++;
-		updateScoreDisplays();
+		// AI scores - no points 
 		lastScorer = "ai";
 		gameActive = false;
 		LK.getSound('score').play();
-		// Check for win
-		if (aiScore >= WINNING_SCORE) {
-			LK.setScore(playerScore); // Set player's score
-			LK.showGameOver();
-		} else {
-			resetAfterScore();
-		}
+		resetAfterScore();
 	} else if (ball.x > GAME_WIDTH) {
 		// Player scores
 		playerScore++;
 		updateScoreDisplays();