/**** 
* Classes
****/ 
/****************************************************************************************** */ 
/**************************************** CLASSES ***************************************** */
/****************************************************************************************** */ 
/****************************************************************************************** */ 
/************************************* ATHLETE CLASS ************************************** */
/****************************************************************************************** */ 
var Athlete = Container.expand(function (line) {
	var self = Container.call(this);
	self.speedX = -1 * globalSpeedPerLine[line];
	self.jumpSpeed = -17;
	self.lastJumpTime = 0;
	self.interJumpDelayMs = 500;
	self.gravity = 0.5;
	self.lineIndex = line;
	self.isAi = line > 0;
	self.isOnGround = true;
	self.isFalling = false; // Indicates if the athlete is currently falling
	self.currentPosture = ""; // Store the name of the current posture
	self.isChangingPosture = false; // 0 when idle or moving down, 1 when moving up
	self.nextPosture = null;
	self.tint = colorsArray[self.lineIndex % colorsArray.length];
	// BODY PARTS
	self.trunk = self.attachAsset('bodyPart', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1,
		scaleY: 1,
		rotation: 0.125,
		tint: 0x000000 //self.tint // TEMP DEBUG
	});
	self.head = self.trunk.attachAsset('head', {
		anchorX: 0.5,
		anchorY: 2,
		scaleX: 1,
		scaleY: 1,
		tint: 0x000000 // self.tint
	});
	self.rightArm = self.trunk.attachAsset('bodyPart', {
		anchorX: 0.5,
		anchorY: 0,
		scaleX: 1,
		scaleY: 1,
		tint: self.tint
	});
	// Right hand asset attachment removed
	self.leftArm = self.trunk.attachAsset('bodyPart', {
		anchorX: 0.5,
		anchorY: 0,
		scaleX: 1,
		scaleY: 1,
		tint: self.tint
	});
	// Left hand asset attachment removed
	self.rightLeg = self.trunk.attachAsset('bodyPart', {
		anchorX: 0.5,
		anchorY: 0,
		scaleX: 1,
		scaleY: 1.0,
		tint: self.tint
	});
	// Right foot asset attachment removed
	self.leftLeg = self.trunk.attachAsset('bodyPart', {
		anchorX: 0.5,
		anchorY: 0,
		scaleX: 1,
		scaleY: 1.0,
		tint: self.tint
	});
	// Left foot asset attachment removed
	// FUNCTIONS
	self.updatePosture = function () {
		var speed = 0.2; // Speed of transition
		if (!self.targetPosture) {
			//log("no targetPosture.");
			return;
		}
		// Check if the target posture for hands and legs is reached
		//log("self.targetPosture: " + self.targetPosture.name + " :  self.rightHand.x: " + self.rightHand.x, " self.targetPosture.rightHand.x: " + self.targetPosture.rightHand.x);
		var handsAndLegsReached = Math.abs(self.rightLeg.x - self.targetPosture.rightLeg.x) < 1 && Math.abs(self.rightLeg.y - self.targetPosture.rightLeg.y) < 1 && Math.abs(self.leftLeg.x - self.targetPosture.leftLeg.x) < 1 && Math.abs(self.leftLeg.y - self.targetPosture.leftLeg.y) < 1 && Math.abs(self.head.x - self.targetPosture.head.x) < 1 && Math.abs(self.head.y - self.targetPosture.head.y) < 1;
		if (handsAndLegsReached) {
			log("handsAndLegsReached !");
			// Update currentPosture to the name of the targetPosture when hands and legs posture is reached
			self.currentPosture = self.targetPosture.name;
			self.targetPosture = null;
			self.isChangingPosture = false;
			if (self.nextPosture) {
				self.setPosture(self.nextPosture);
			}
			return;
		} else {
			self.isChangingPosture = true;
		}
		if (self.targetPosture && self.targetPosture.head) {
			self.head.x += (self.targetPosture.head.x - self.head.x) * speed;
		}
		self.trunk.rotation += (self.targetPosture.trunk.r - self.trunk.rotation) * speed;
		self.head.y += (self.targetPosture.head.y - self.head.y) * speed;
		self.rightArm.x += (self.targetPosture.rightArm.x - self.rightArm.x) * speed;
		self.rightArm.y += (self.targetPosture.rightArm.y - self.rightArm.y) * speed;
		self.rightArm.rotation += (self.targetPosture.rightArm.r - self.rightArm.rotation) * speed;
		//log("Posture rightArm.rotation=" + self.rightArm.rotation);
		// Right hand updates removed due to hand assets being removed
		self.leftArm.x += (self.targetPosture.leftArm.x - self.leftArm.x) * speed;
		self.leftArm.y += (self.targetPosture.leftArm.y - self.leftArm.y) * speed;
		self.leftArm.rotation += (self.targetPosture.leftArm.r - self.leftArm.rotation) * speed;
		// Left hand updates removed due to hand assets being removed
		self.trunk.x += (self.targetPosture.trunk.x - self.trunk.x) * speed;
		self.trunk.y += (self.targetPosture.trunk.y - self.trunk.y) * speed;
		self.rightLeg.x += (self.targetPosture.rightLeg.x - self.rightLeg.x) * speed;
		self.rightLeg.y += (self.targetPosture.rightLeg.y - self.rightLeg.y) * speed;
		// Right foot updates removed due to foot assets being removed
		self.leftLeg.x += (self.targetPosture.leftLeg.x - self.leftLeg.x) * speed;
		self.leftLeg.y += (self.targetPosture.leftLeg.y - self.leftLeg.y) * speed;
	};
	self.moveRight = function () {
		self.x += self.speedX;
	};
	self.jump = function () {
		globalSpeedPerLine[self.lineIndex] = globalSpeedPerLine[self.lineIndex] * 0.9;
		if (self.isOnGround && Date.now() - self.lastJumpTime > self.interJumpDelayMs) {
			self.isOnGround = false;
			self.speedY = self.jumpSpeed;
			self.lastJumpTime = Date.now();
			log("--------------- JUMP --------------------");
		}
	};
	self.update = function () {
		if (!self.isFalling) {
			if (self.isOnGround) {
				self.leftLeg.height = 200;
				self.leftArm.height = 200;
				self.trunk.rotation = 0.125;
				self.runAnim();
			} else {
				self.speedY += self.gravity * Math.abs(globalSpeedPerLine[0] / 10); //self.lineIndex
				self.y += self.speedY * Math.abs(globalSpeedPerLine[0] / 10); //self.lineIndex
				//log("self.speedY=" + self.speedY, " / self.y=" + self.y);
				if (self.y >= linesGroundLevels[self.lineIndex]) {
					self.y = linesGroundLevels[self.lineIndex];
					self.isOnGround = true;
					self.speedY = 0;
				} else {
					self.jumpAnim();
				}
			}
		} else {
			self.y += 5;
			if (self.y >= linesGroundLevels[self.lineIndex] + 200) {
				self.y = linesGroundLevels[self.lineIndex] + 200;
				self.isOnGround = true;
				self.speedY = 0;
			}
		}
		self.updatePosture();
		/* ********************************************************** ATHLETE AI **************************************************** */
		if (self.isAi) {
			if (athlete.isFalling) {
				self.moveRight();
			} else {
				//self.x += 4 - 8 * Math.random();
				self.x += globalSpeedPerLine[self.lineIndex] * 0.05 * Math.random();
			}
			// Auto jump hurdles in obstacles[self.lineIndex]
			if (self.isOnGround) {
				for (var i = 0; i < obstacles[self.lineIndex].length; i++) {
					var distance = obstacles[self.lineIndex][i].x - self.x;
					if (distance > 0 && distance <= 200) {
						self.jump();
						break; // Jump once for the closest obstacle within range
					}
				}
			}
		}
	};
	self.runAnim = function () {
		var ocsilDelay = 5;
		var armsAmplitude = 0.5;
		var legsAmplitude = 0.5;
		// Simulate running by continuously balancing the arms and legs
		var runningArmAngle = Math.sin(LK.ticks / ocsilDelay) * armsAmplitude; // Oscillate arm angle to simulate running faster
		var runningLegAngle = Math.sin(LK.ticks / ocsilDelay) * legsAmplitude; // Oscillate leg angle to simulate running faster
		var armSwitchProgress = (Math.sin(LK.ticks / 5) + 0) / 2; // Normalize between 0 and 1
		self.rightArm.x = 10 * (1 - armSwitchProgress) - 5 * armSwitchProgress;
		self.leftArm.x = -15 * (1 - armSwitchProgress) + 20 * armSwitchProgress;
		self.rightLeg.x = 5 * (1 - armSwitchProgress) - 5 * armSwitchProgress;
		self.leftLeg.x = -10 * (1 - armSwitchProgress) + 10 * armSwitchProgress;
		//log("Run rightArm.rotation=" + runningArmAngle);
		self.rightArm.rotation = runningArmAngle;
		self.leftArm.rotation = -runningArmAngle;
		self.rightLeg.rotation = -runningLegAngle;
		self.leftLeg.rotation = runningLegAngle;
		self.trunk.width = 30 - 10 * (runningArmAngle * Math.PI * 0.5);
		self.head.width = 50 - 10 * (runningArmAngle * Math.PI * 0.5);
	};
	self.jumpAnim = function () {
		var ocsilDelay = 50;
		var armsAmplitude = 1;
		// Simulate running by continuously balancing the arms and legs
		var runningArmAngle = Math.sin(LK.ticks / ocsilDelay) * armsAmplitude; // Oscillate arm angle to simulate running faster
		var armSwitchProgress = (Math.sin(LK.ticks / 5) + 0) / 2; // Normalize between 0 and 1
		self.rightArm.x = 10 * (1 - armSwitchProgress) - 5 * armSwitchProgress;
		self.leftArm.x = -15 * (1 - armSwitchProgress) + 20 * armSwitchProgress;
		self.rightLeg.x = 5 * (1 - armSwitchProgress) - 5 * armSwitchProgress;
		self.leftLeg.x = -10 * (1 - armSwitchProgress) + 10 * armSwitchProgress;
		self.trunk.width = 30 - 10 * (runningArmAngle * Math.PI * 0.5); //armSwitchProgress; // + 10 * Math.abs(runningArmAngle);
		self.trunk.rotation = 0.333; //armSwitchProgress; // + 10 * Math.abs(runningArmAngle);
		var rotationSpeed = 0.05; // Speed of rotation change
		if (self.speedY > 0) {
			self.rightArm.rotation += (0 - self.rightArm.rotation) * rotationSpeed % (Math.PI * 2);
			self.leftArm.rotation += (0 - self.leftArm.rotation) * rotationSpeed % (Math.PI * 2);
			// Return legs to initial rotation when descending
			self.rightLeg.rotation += (0 - self.rightLeg.rotation) * rotationSpeed;
			self.leftLeg.rotation += (0 - self.leftLeg.rotation) * rotationSpeed;
			self.leftLeg.height -= 30 * rotationSpeed;
			self.leftArm.height -= 20 * rotationSpeed;
		} else {
			//log("self.rightArm.rotation=" + self.rightArm.rotation, " + " + -Math.PI * 3 * rotationSpeed % (Math.PI * 2));
			self.rightArm.rotation += -Math.PI * 3 * rotationSpeed % (Math.PI * 2);
			self.leftArm.rotation += Math.PI * 1.75 * rotationSpeed % (Math.PI * 2);
			// Continue with jump animation adjustments
			self.rightLeg.rotation += (-2.6 - self.rightLeg.rotation) * rotationSpeed;
			self.leftLeg.rotation += (1 - self.leftLeg.rotation) * rotationSpeed;
			self.leftLeg.height -= 0 * rotationSpeed;
			self.leftArm.height -= 35 * rotationSpeed;
		}
	};
	self.fallAnim = function () {
		var fallSpeed = 0.1; // Speed of fall animation
		// Adjust body parts to simulate falling
		self.trunk.rotation += (Math.PI / 2 - self.trunk.rotation) * fallSpeed;
		self.rightArm.rotation += (Math.PI / 2 - self.rightArm.rotation) * fallSpeed;
		self.leftArm.rotation += (Math.PI / 2 - self.leftArm.rotation) * fallSpeed;
		self.rightLeg.rotation += (Math.PI / 2 - self.rightLeg.rotation) * fallSpeed;
		self.leftLeg.rotation += (Math.PI / 2 - self.leftLeg.rotation) * fallSpeed;
	};
	self.setPosture = function (newPosture) {
		log("Set posture: " + newPosture.name);
		self.targetPosture = newPosture;
	};
	self.restore = function () {
		log("restore...");
		self.x = 400;
		self.y = linesGroundLevels[self.lineIndex];
		self.speedY = 0;
		self.trunk.rotation = 0;
		self.rightArm.rotation = idlePosture.rightArm.r;
		self.leftArm.rotation = 0;
		self.rightLeg.rotation = 0;
		self.leftLeg.rotation = 0;
		self.setPosture(idlePosture);
		self.isFalling = false;
		self.isOnGround = true;
		self.hasFlashed = false;
		self.hasFlashedGround = false;
	};
});
/****************************************************************************************** */ 
/************************************** OBSTACLE CLASS ************************************ */
/****************************************************************************************** */ 
// Obstacle class
var Obstacle = Container.expand(function (line) {
	var self = Container.call(this);
	self.lineIndex = line;
	self.leftRod = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 1.0 // Anchor at the bottom for collision detection
	});
	self.centralRod = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 1,
		y: -200,
		rotation: Math.PI * 0.125,
		tint: 0xffff00 // Apply a yellow tint for glow effect
	});
	self.rightRod = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.0,
		x: 95,
		y: -460
	});
	self.speedX = globalSpeedPerLine[0];
	self.update = function () {
		self.speedX = globalSpeedPerLine[0];
		self.x += self.speedX;
	};
});
/****************************************************************************************** */ 
/************************************** TRACK CLASS ************************************ */
/****************************************************************************************** */ 
var Track = Container.expand(function () {
	var self = Container.call(this);
	self.speedX = globalSpeedPerLine[0]; // Use global speed for track movement
	// Attach track asset
	self.trackAsset = self.attachAsset('track', {
		anchorX: 0.0,
		anchorY: 0.0
	});
	// Method to update track position
	self.update = function () {
		self.speedX = globalSpeedPerLine[0];
		self.x += self.speedX;
		// Reset position to create a continuous track effect
		if (self.x <= -2048 - self.speedX * 2) {
			self.x = 2048 + self.speedX * 2;
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB // Light blue background to represent the sky
});

/**** 
* Game Code
****/ 
/****************************************************************************************** */ 
/************************************** GLOBAL VARIABLES ********************************** */
/****************************************************************************************** */ 
// Enumeration for game states
var GAME_STATE = {
	INIT: 'INIT',
	MENU: 'MENU',
	HELP: 'HELP',
	STARTING: 'STARTING',
	NEW_ROUND: 'NEW_ROUND',
	PLAYING: 'PLAYING',
	SCORE: 'SCORE'
};
var gameState = GAME_STATE.INIT;
var athlete;
var opponents = [];
var numberOfOpponents = 3; // Adjust based on the actual number of opponents in the game
var groundLevel = 2732 - 200; // Ground level set 200px from the bottom
var linesGroundLevels = [groundLevel - 200, groundLevel - 420, groundLevel - 640]; // Ground level set 200px from the bottom
var groundLevelLine1 = 2732 - 200; // Ground level set 200px from the bottom
var numberOfLines = 1 + numberOfOpponents;
var obstacles = [[], []];
var obstacleSpawnTicker = 0;
var obstacleSpawnRate = 180; // Spawn an obstacle every 2 seconds
var obstacleJustPassed = false;
var track;
var track2;
var track3;
var track4;
var scoreTxt;
var globalSpeed = -10; //-10; // Global speed for tracks and obstacles min = -4
var globalSpeedIncreaseStep = 5;
var globalSpeedPerLine = [-10, -10];
var colorsArray = [0x1188FF, 0xFF0000, 0x00FF00, 0xFFFF00, 0xFF00FF, 0x00FFFF, 0xFFFFFF, 0xFF8811];
var isDebug = true;
var debugMarker;
// UI
var startText;
var startButton;
/****************************************************************************************** */ 
/************************************** POSTURES ****************************************** */
/****************************************************************************************** */ 
var idlePosture = {
	name: "idlePosture",
	trunk: {
		x: 0,
		y: 0,
		r: 0.125
	},
	head: {
		x: 0,
		y: 0
	},
	rightArm: {
		x: 20,
		y: -80,
		r: 0 //Math.PI * 2 * 0.0
	},
	leftArm: {
		x: -20,
		y: -80,
		r: 0 //Math.PI * 2 * 0.125
	},
	rightLeg: {
		x: 5,
		y: 100
	},
	leftLeg: {
		x: -5,
		y: 100
	}
};
/****************************************************************************************** */ 
/*********************************** UTILITY FUNCTIONS ************************************ */
/****************************************************************************************** */ 
function log() {
	if (isDebug) {
		var _console;
		(_console = console).log.apply(_console, arguments);
	}
}
/****************************************************************************************** */ 
/************************************** INPUT HANDLERS ************************************ */
/****************************************************************************************** */ 
// Touch event to make the athlete jump
game.on('down', function () {
	athlete.jump();
});
/****************************************************************************************** */ 
/************************************* AI FUNCTIONS *************************************** */
/****************************************************************************************** */ 
/****************************************************************************************** */ 
/************************************* GAME STATES **************************************** */
/****************************************************************************************** */ 
function gameInitialize() {
	log("Game initialize...");
	// Add background asset
	scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff" // White color for better visibility
	});
	scoreTxt.anchor.set(0.5, 0); // Center the score text horizontally
	LK.gui.top.addChild(scoreTxt); // Add the score text to the GUI overlay at the top center
	var background = LK.getAsset('background', {
		anchorX: 0.0,
		anchorY: 0.0,
		visible: false // TEMP DEBUG
	});
	game.addChild(background);
	// Initialize track using Track class
	track = game.addChild(new Track());
	track.x = 0;
	track.y = 2732 - 512;
	// Second track instance for continuous effect
	track2 = game.addChild(new Track());
	track2.x = 2048; // Position the second track right after the first one
	track2.y = 2732 - 512;
	// Second line track 1
	track3 = game.addChild(new Track());
	track3.x = 0;
	track3.y = 2732 - 1024;
	// Second line track 2
	track4 = game.addChild(new Track());
	track4.x = 2048;
	track4.y = 2732 - 1024;
	// Initialize ground levels & speeds
	for (var line = 0; line < numberOfLines; line++) {
		linesGroundLevels[line] = groundLevel - 200 - 220 * line;
		globalSpeedPerLine[line] = -10;
	}
	// Initialize athlete
	athlete = game.addChild(new Athlete(0));
	athlete.restore();
	// Initialize opponents
	for (var i = 0; i < numberOfOpponents; i++) {
		opponents[i] = game.addChild(new Athlete(i + 1));
		opponents[i].restore();
	}
	// Add Button in the center of the screen
	startButton = LK.getAsset('button', {
		anchorX: 0.5,
		// Center the button horizontally
		anchorY: 0.5,
		// Center the button vertically
		x: 2048 / 2,
		// Position horizontally in the center
		y: 2732 / 2 // Position vertically above the start text
	});
	game.addChild(startButton);
	startButton.on('down', function () {
		cleanMenuState();
		gameState = GAME_STATE.PLAYING;
	});
	// Add Start Text in the center of the screen
	startText = new Text2('START', {
		size: 200,
		fill: "#ffffff" // White color for better visibility
	});
	startText.anchor.set(0.5, 0.5); // Center the text horizontally and vertically
	startText.x = 2048 / 2; // Center horizontally
	startText.y = 2732 / 2; // Center vertically
	game.addChild(startText);
	gameState = GAME_STATE.MENU;
	if (isDebug) {
		// Debug Marker
		debugMarker = LK.getAsset('debugMarker', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		game.addChild(debugMarker);
		debugMarker.x = 0;
		debugMarker.y = groundLevel;
	}
}
function gamePlaying() {
	//log("Game playing...");
	// Spawn obstacles
	spawnObstacles();
	// Update obstacles
	updateObstacles();
	// Update tracks
	updateTracks();
	// Update Progress
	updateProgress();
	// Update opponents
	opponents.forEach(function (opponent) {
		opponent.update();
		game.addChild(opponent);
	});
	// Update athlete
	athlete.update();
	game.addChild(athlete);
	// Check for collisions
	checkForCollisions();
}
function cleanMenuState() {
	game.removeChild(startText);
	game.removeChild(startButton);
}
/****************************************************************************************** */ 
/************************************** GAME FUNCTIONS ************************************ */
/****************************************************************************************** */ 
function updateTracks() {
	if (!(athlete.isFalling && athlete.isOnGround)) {
		track.update();
		track2.update();
		track3.update();
		track4.update();
	}
}
function spawnObstacles() {
	// Spawn obstacles
	obstacleSpawnTicker += athlete.isFalling ? 0 : 1;
	if (obstacleSpawnTicker >= obstacleSpawnRate) {
		obstacleSpawnTicker = 0;
		for (var line = 0; line < numberOfLines; line++) {
			obstacles[line] = obstacles[line] || [];
			var newObstacle = new Obstacle(line);
			newObstacle.x = 2048 + 100 * line; // Start from the right edge      
			newObstacle.y = groundLevel + 200 - 220 * line;
			obstacles[line].push(newObstacle);
			game.addChild(newObstacle);
		}
	}
}
function updateObstacles() {
	// Update obstacles
	for (var line = 0; line < numberOfLines; line++) {
		obstacles[line] = obstacles[line] || [];
		for (var i = obstacles[line].length - 1; i >= 0; i--) {
			obstacles[line][i].update();
			// Remove obstacle if it moves off-screen and increase global speed
			if (obstacles[line][i].x < -100) {
				// Assuming obstacle width is less than 100px
				obstacles[line][i].destroy();
				obstacles[line].splice(i, 1);
				if (line == 0) {
					obstacleJustPassed = true;
				}
			}
		}
	}
}
function updateProgress() {
	if (obstacleJustPassed) {
		// Update Progress
		obstacleJustPassed = false;
		LK.setScore(LK.getScore() + 1); // Add 1 to score for each hurdle passed only if not falling
		scoreTxt.setText(LK.getScore()); // Update score text with prefix
		// Increase global speed after each obstacle passed and add 1 to score only if not falling
		for (var line = 0; line < numberOfLines; line++) {
			globalSpeedPerLine[line] -= globalSpeedIncreaseStep;
		}
	}
}
function checkForCollisions() {
	for (var line = 0; line < numberOfLines; line++) {
		obstacles[line] = obstacles[line] || [];
		for (var i = 0; i < obstacles[line].length; i++) {
			var obstacle = obstacles[line][i];
			if (line === 0) {
				if (athlete.intersects(obstacle.centralRod)) {
					athlete.isFalling = true;
					athlete.isOnGround = false;
					athlete.fallAnim(); // Call fall animation before game over
				}
			} else {
				if (opponents[line - 1].intersects(obstacle.centralRod)) {
					opponents[line - 1].isFalling = true;
					opponents[line - 1].isOnGround = false;
					opponents[line - 1].fallAnim(); // Call fall animation before game over
				}
			}
		}
	}
	handleFallEvent();
}
function handleFallEvent() {
	if (athlete.isFalling && !athlete.hasFlashed) {
		LK.effects.flashScreen(0xaaaaaa, 500); // Flash screen red for half a second
		athlete.hasFlashed = true;
		globalSpeedPerLine[0] /= 1.5;
	}
	if (athlete.hasFlashed && !athlete.hasFlashedGround && athlete.isFalling && athlete.isOnGround) {
		LK.effects.flashScreen(0xff0000, 500); // Flash screen red for half a second
		athlete.hasFlashedGround = true;
		globalSpeedPerLine[0] = 0;
		LK.setTimeout(function () {
			//LK.showGameOver(); // Show game over screen
			globalSpeedPerLine[0] = -10;
			athlete.restore();
		}, 1000); // Delay game over to allow fall animation to be seen
	}
	for (var i = 0; i < numberOfOpponents; i++) {
		log("opponents[i]: ", opponents[i]);
		if (opponents[i] && opponents[i].isFalling && !opponents[i].hasFlashed) {
			opponents[i].hasFlashed = true;
			LK.setTimeout(function () {
				globalSpeedPerLine[i + 1] = -10;
				opponents[i].restore();
			}, 1000);
		}
	}
}
/****************************************************************************************** */ 
/************************************** MAIN GAME LOOP ************************************ */
/****************************************************************************************** */ 
LK.on('tick', function () {
	switch (gameState) {
		case GAME_STATE.MENU:
			// Handle menu logic here
			break;
		case GAME_STATE.STARTING:
			// Handle game starting logic here
			break;
		case GAME_STATE.PLAYING:
			gamePlaying();
			break;
		case GAME_STATE.SCORE:
			// Handle score display logic here
			break;
	}
});
gameInitialize();

===================================================================
--- original.js
+++ change.js
@@ -613,9 +613,9 @@
 		}, 1000); // Delay game over to allow fall animation to be seen
 	}
 	for (var i = 0; i < numberOfOpponents; i++) {
 		log("opponents[i]: ", opponents[i]);
-		if (opponents[i].isFalling && !opponents[i].hasFlashed) {
+		if (opponents[i] && opponents[i].isFalling && !opponents[i].hasFlashed) {
 			opponents[i].hasFlashed = true;
 			LK.setTimeout(function () {
 				globalSpeedPerLine[i + 1] = -10;
 				opponents[i].restore();