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

/**** 
* Classes
****/ 
// Ball class: the fixed shooter at bottom left
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballAsset = self.attachAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: BALL_SIZE,
		height: BALL_SIZE,
		color: 0xffffff,
		shape: 'ellipse'
	});
	return self;
});
// Bullet class: fired from ball towards crosshair
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletAsset = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: BULLET_SIZE,
		height: BULLET_SIZE,
		color: 0x00e6e6,
		shape: 'ellipse'
	});
	self.vx = 0;
	self.vy = 0;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
	};
	return self;
});
// Crosshair class: follows facekit position
var Crosshair = Container.expand(function () {
	var self = Container.call(this);
	var crossAsset = self.attachAsset('crosshair', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: CROSS_SIZE,
		height: CROSS_SIZE,
		color: 0xff0000,
		shape: 'ellipse'
	});
	return self;
});
// Note class: falling note
var Note = Container.expand(function () {
	var self = Container.call(this);
	// Randomly pick a color for the note
	var color = NOTE_COLORS[Math.floor(Math.random() * NOTE_COLORS.length)];
	var noteAsset = self.attachAsset('note', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: NOTE_WIDTH,
		// now wider
		height: NOTE_HEIGHT,
		color: color,
		shape: 'box'
	});
	self.column = 0; // which column this note is in
	self.speed = noteFallSpeed; // will be set on spawn
	self.hit = false; // has this note been hit
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181a20
});

/**** 
* Game Code
****/ 
// Note: All note assets will be ellipses with different colors for variety
// --- Constants ---
var NOTE_COLORS = [0xffe066, 0x66b3ff, 0xff66a3, 0x7cff66, 0xff8c66];
var GAME_W = 2048;
var GAME_H = 2732;
var BALL_SIZE = 420;
var NOTE_WIDTH = 180; // was 120, now wider for less thin look
var NOTE_HEIGHT = 180; // reduced from 260 to make notes less long
var CROSS_SIZE = 160;
var BULLET_SIZE = 60;
var NOTE_COLS = 5;
var NOTE_MARGIN = 60;
var NOTE_AREA_W = GAME_W - 2 * NOTE_MARGIN;
var NOTE_COL_W = NOTE_AREA_W / NOTE_COLS;
var NOTE_START_Y = -NOTE_HEIGHT;
var BALL_X = 180;
var BALL_Y = GAME_H - 220;
var CROSS_MIN_X = 200;
var CROSS_MAX_X = GAME_W - 200;
var CROSS_MIN_Y = 200;
var CROSS_MAX_Y = GAME_H - 400;
var BULLET_SPEED = 48; // px per frame
// --- Game State ---
var notes = [];
var bullets = [];
var crosshair = null;
var ball = null;
var scoreTxt = null;
var tipTxt = null;
var lastNoteSpawnTick = 0;
var noteFallSpeed = 12; // will be set by difficulty
var noteSpawnInterval = 60; // ticks between notes, will be set by difficulty
var difficulty = null; // 'slow', 'normal', 'fast'
var gameStarted = false;
var canShoot = true;
var lastScore = 0;
var musicTracks = [{
	id: 'music1',
	name: 'Parça 1'
}, {
	id: 'music2',
	name: 'Parça 2'
}, {
	id: 'music3',
	name: 'Parça 3'
}];
var currentMusic = null;
// --- Difficulty Presets ---
// Slowed down for all modes
var DIFFICULTY_PRESETS = {
	'slow': {
		noteFallSpeed: 5,
		noteSpawnInterval: 120
	},
	'normal': {
		noteFallSpeed: 7,
		noteSpawnInterval: 90
	},
	'fast': {
		noteFallSpeed: 10,
		noteSpawnInterval: 60
	}
};
// --- UI: Difficulty Selection ---
var diffBtns = [];
function showDifficultyMenu() {
	// Hide facekit video feed if visible
	if (facekit && typeof facekit.setVisible === "function") {
		facekit.setVisible(false);
	}
	// Add Backr image as background
	if (!game._diffMenuBackr) {
		var backr = LK.getAsset('Backr', {
			anchorX: 0.5,
			anchorY: 0.5,
			width: GAME_W,
			height: GAME_H,
			x: GAME_W / 2,
			y: GAME_H / 2
		});
		game.addChild(backr);
		game._diffMenuBackr = backr;
	}
	var btnLabels = [{
		key: 'slow',
		label: 'Slow'
	}, {
		key: 'normal',
		label: 'Normal'
	}, {
		key: 'fast',
		label: 'Fast'
	}];
	var btnW = 500,
		btnH = 180,
		btnGap = 60;
	var startY = GAME_H / 2 - (btnLabels.length * btnH + (btnLabels.length - 1) * btnGap) / 2;
	for (var i = 0; i < btnLabels.length; i++) {
		var btn = new Container();
		var bg = btn.attachAsset('btnbg', {
			anchorX: 0.5,
			anchorY: 0.5,
			width: btnW,
			height: btnH,
			color: 0x222a38,
			shape: 'box'
		});
		var txt = new Text2(btnLabels[i].label, {
			size: 90,
			fill: "#fff"
		});
		txt.anchor.set(0.5, 0.5);
		txt.x = 0;
		txt.y = 0;
		btn.addChild(txt);
		btn.x = GAME_W / 2;
		btn.y = startY + i * (btnH + btnGap);
		btn.difficulty = btnLabels[i].key;
		btn.down = function (x, y, obj) {
			startGame(this.difficulty);
		};
		game.addChild(btn);
		diffBtns.push(btn);
	}
	// Show tip
	if (!tipTxt) {
		tipTxt = new Text2("Aim at the notes by\nmoving your head\nand fire the gun by\ntapping the screen.", {
			size: 70,
			fill: 0x00ff00
		});
		tipTxt.anchor.set(0.5, 0);
	}
	tipTxt.x = GAME_W / 2;
	tipTxt.y = 180;
	game.addChild(tipTxt);
}
// Remove difficulty menu
function hideDifficultyMenu() {
	// Restore facekit video feed
	if (facekit && typeof facekit.setVisible === "function") {
		facekit.setVisible(true);
	}
	// Remove Backr background if present
	if (game._diffMenuBackr) {
		game._diffMenuBackr.destroy();
		game._diffMenuBackr = null;
	}
	for (var i = 0; i < diffBtns.length; i++) {
		diffBtns[i].destroy();
	}
	diffBtns = [];
	if (tipTxt) {
		tipTxt.destroy();
		tipTxt = null;
	}
}
// --- Start Game ---
function startGame(diffKey) {
	difficulty = diffKey;
	noteFallSpeed = DIFFICULTY_PRESETS[diffKey].noteFallSpeed;
	noteSpawnInterval = DIFFICULTY_PRESETS[diffKey].noteSpawnInterval;
	gameStarted = true;
	hideDifficultyMenu();
	LK.setScore(0);
	lastScore = 0;
	// Clean up any existing notes and bullets before starting
	for (var i = 0; i < notes.length; i++) {
		if (notes[i]) notes[i].destroy();
	}
	notes = [];
	for (var i = 0; i < bullets.length; i++) {
		if (bullets[i]) bullets[i].destroy();
	}
	bullets = [];
	// Play PH6 only in fast mode, and make it more dominant in randomization
	var musicChoices;
	if (difficulty === 'fast') {
		// PH6 is more dominant: add it multiple times to increase its chance
		musicChoices = ['Ph6', 'Ph6', 'Ph6', 'Piano1', 'P2', 'P3', 'P4', 'P5'];
	} else {
		musicChoices = ['Piano1', 'P2', 'P3', 'P4', 'P5'];
	}
	var selectedMusic = musicChoices[Math.floor(Math.random() * musicChoices.length)];
	LK.playMusic(selectedMusic);
	// Ball
	ball = new Ball();
	ball.x = BALL_X;
	ball.y = BALL_Y;
	game.addChild(ball);
	// Crosshair
	crosshair = new Crosshair();
	crosshair.x = BALL_X + 400;
	crosshair.y = BALL_Y - 400;
	game.addChild(crosshair);
	// Score
	if (!scoreTxt) {
		scoreTxt = new Text2('0', {
			size: 120,
			fill: "#fff"
		});
		scoreTxt.anchor.set(0.5, 0);
		LK.gui.top.addChild(scoreTxt);
	}
	scoreTxt.setText(0);
	// Show tip for a few seconds
	if (!tipTxt) {
		tipTxt = new Text2("Aim at the notes by\nmoving your head\nand fire the gun by\ntapping the screen.", {
			size: 70,
			fill: 0x00ff00
		});
		tipTxt.anchor.set(0.5, 0);
	}
	tipTxt.x = GAME_W / 2;
	tipTxt.y = 180;
	game.addChild(tipTxt);
	LK.setTimeout(function () {
		if (tipTxt) {
			tipTxt.destroy();
			tipTxt = null;
		}
	}, 3000);
}
// --- End Game ---
function endGame(win) {
	// Clean up
	for (var i = 0; i < notes.length; i++) {
		if (notes[i]) notes[i].destroy();
	}
	notes = [];
	for (var i = 0; i < bullets.length; i++) {
		if (bullets[i]) bullets[i].destroy();
	}
	bullets = [];
	if (ball) {
		ball.destroy();
		ball = null;
	}
	if (crosshair) {
		crosshair.destroy();
		crosshair = null;
	}
	gameStarted = false;
	LK.stopMusic();
	if (win) {
		LK.showYouWin();
	} else {
		LK.stopMusic();
		LK.showGameOver();
	}
}
// --- Note Spawning ---
function spawnNote() {
	var note = new Note();
	// Pick a random column, but skip the leftmost column (index 0) where the gun is located
	// Only allow notes in columns 1, 2, 3, 4 (total 4 columns, not 5)
	var allowedCols = [];
	for (var i = 1; i < NOTE_COLS; i++) {
		allowedCols.push(i);
	}
	var col = allowedCols[Math.floor(Math.random() * allowedCols.length)];
	note.column = col;
	note.x = NOTE_MARGIN + NOTE_COL_W / 2 + col * NOTE_COL_W;
	note.y = NOTE_START_Y;
	note.speed = noteFallSpeed;
	notes.push(note);
	game.addChild(note);
}
// --- Difficulty Increase ---
function maybeIncreaseDifficulty() {
	var score = LK.getScore();
	if (score > 0 && score % 10 === 0 && score !== lastScore) {
		// Increase speed and spawn rate
		noteFallSpeed += 2;
		if (noteSpawnInterval > 20) noteSpawnInterval -= 6;
		lastScore = score;
	}
}
// --- Facekit Crosshair Update ---
function updateCrosshair() {
	if (!crosshair) return;
	// Use facekit.noseTip or facekit.mouthCenter for aiming
	var fx = facekit.noseTip ? facekit.noseTip.x : facekit.mouthCenter ? facekit.mouthCenter.x : GAME_W / 2;
	var fy = facekit.noseTip ? facekit.noseTip.y : facekit.mouthCenter ? facekit.mouthCenter.y : GAME_H / 2;
	// Clamp to play area
	if (fx < CROSS_MIN_X) fx = CROSS_MIN_X;
	if (fx > CROSS_MAX_X) fx = CROSS_MAX_X;
	if (fy < CROSS_MIN_Y) fy = CROSS_MIN_Y;
	if (fy > CROSS_MAX_Y) fy = CROSS_MAX_Y;
	// Instantly set crosshair position (no smoothing, no tween)
	crosshair.x = fx;
	crosshair.y = fy;
}
// --- Fire Bullet ---
function fireBullet() {
	if (!canShoot || !gameStarted) return;
	canShoot = false;
	// Find if crosshair is over a note
	var hitNote = null;
	for (var i = 0; i < notes.length; i++) {
		var n = notes[i];
		if (!n.hit && crosshair && crosshair.intersects(n)) {
			hitNote = n;
			break;
		}
	}
	// Fire bullet towards crosshair
	var b = new Bullet();
	b.x = ball.x;
	b.y = ball.y;
	// Direction vector
	var dx = crosshair.x - ball.x;
	var dy = crosshair.y - ball.y;
	var len = Math.sqrt(dx * dx + dy * dy);
	if (len === 0) {
		dx = 0;
		dy = -1;
		len = 1;
	}
	b.vx = BULLET_SPEED * dx / len;
	b.vy = BULLET_SPEED * dy / len;
	bullets.push(b);
	game.addChild(b);
	// If hitNote, mark as hit (so only one bullet per note)
	if (hitNote) {
		hitNote.hit = true;
	}
	// Play note sound (simulate: play a sound per note column)
	var soundId = 'note' + (hitNote ? hitNote.column : Math.floor(Math.random() * NOTE_COLS));
	LK.getSound(soundId).play();
	// Allow next shot after a normal delay (normal fire rate)
	LK.setTimeout(function () {
		canShoot = true;
	}, 320);
}
// --- Main Game Loop ---
game.down = function (x, y, obj) {
	if (gameStarted) {
		fireBullet();
	}
};
game.update = function () {
	if (!gameStarted) return;
	// Update crosshair position from facekit
	updateCrosshair();
	// Spawn notes
	if (LK.ticks - lastNoteSpawnTick >= noteSpawnInterval) {
		spawnNote();
		lastNoteSpawnTick = LK.ticks;
	}
	// Only fire bullet on user tap (remove continuous fire to reduce lag)
	// fireBullet();
	// Update notes
	for (var i = notes.length - 1; i >= 0; i--) {
		var n = notes[i];
		n.update();
		// If note is hit and bullet will reach it, handled below
		// If note falls below screen, game over
		if (n.y > GAME_H + NOTE_HEIGHT / 2) {
			endGame(false);
			return;
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var b = bullets[i];
		b.update();
		// Remove bullet if out of bounds
		if (b.x < -100 || b.x > GAME_W + 100 || b.y < -100 || b.y > GAME_H + 100) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with notes
		for (var j = notes.length - 1; j >= 0; j--) {
			var n = notes[j];
			// Initialize lastWasIntersecting if not set
			if (typeof b.lastWasIntersecting === "undefined") b.lastWasIntersecting = false;
			var isIntersecting = b.intersects(n);
			// Only count as a hit if bullet just started intersecting a note that is not already destroyed
			// Make hitbox more forgiving: allow hit if bullet is close to note center (within 0.6*NOTE_WIDTH and 0.6*NOTE_HEIGHT)
			var forgivingHit = false;
			if (!n.hit) {
				var dx = Math.abs(b.x - n.x);
				var dy = Math.abs(b.y - n.y);
				if (dx < NOTE_WIDTH * 0.6 && dy < NOTE_HEIGHT * 0.6) {
					forgivingHit = true;
				}
			}
			if (!n.hit && (b.lastWasIntersecting === false && isIntersecting || forgivingHit)) {
				n.hit = true; // Mark as hit immediately to prevent double hits
				LK.setScore(LK.getScore() + 1);
				scoreTxt.setText(LK.getScore());
				// Remove note and bullet
				n.destroy();
				notes.splice(j, 1);
				b.destroy();
				bullets.splice(i, 1);
				// Difficulty up
				maybeIncreaseDifficulty();
				// Win condition: 50 points
				if (LK.getScore() >= 50) {
					endGame(true);
					return;
				}
				break;
			}
			b.lastWasIntersecting = isIntersecting;
		}
	}
};
// --- Show Difficulty Menu on Start ---
showDifficultyMenu();
/**** 
* Asset Initialization (for static analysis)
****/ 
// Notes (5 columns, 5 colors)
for (var i = 0; i < NOTE_COLS; i++) {}
// Ball
// Crosshair
// Bullet
// Button background
// Music tracks

===================================================================
--- original.js
+++ change.js
@@ -150,25 +150,24 @@
 };
 // --- UI: Difficulty Selection ---
 var diffBtns = [];
 function showDifficultyMenu() {
-	// Hide facekit camera feed if active
-	if (facekit && typeof facekit.disableCamera === "function") {
-		facekit.disableCamera();
+	// Hide facekit video feed if visible
+	if (facekit && typeof facekit.setVisible === "function") {
+		facekit.setVisible(false);
 	}
-	// Add a background image for the menu (covering the whole game area)
-	if (!showDifficultyMenu.bgImg) {
-		var bgImg = LK.getAsset('ball', {
-			// Use 'ball' as a placeholder background image
+	// Add Backr image as background
+	if (!game._diffMenuBackr) {
+		var backr = LK.getAsset('Backr', {
 			anchorX: 0.5,
 			anchorY: 0.5,
 			width: GAME_W,
-			height: GAME_H
+			height: GAME_H,
+			x: GAME_W / 2,
+			y: GAME_H / 2
 		});
-		bgImg.x = GAME_W / 2;
-		bgImg.y = GAME_H / 2;
-		game.addChild(bgImg);
-		showDifficultyMenu.bgImg = bgImg;
+		game.addChild(backr);
+		game._diffMenuBackr = backr;
 	}
 	var btnLabels = [{
 		key: 'slow',
 		label: 'Slow'
@@ -223,16 +222,16 @@
 	game.addChild(tipTxt);
 }
 // Remove difficulty menu
 function hideDifficultyMenu() {
-	// Remove menu background image if present
-	if (showDifficultyMenu.bgImg) {
-		showDifficultyMenu.bgImg.destroy();
-		showDifficultyMenu.bgImg = null;
+	// Restore facekit video feed
+	if (facekit && typeof facekit.setVisible === "function") {
+		facekit.setVisible(true);
 	}
-	// Re-enable facekit camera feed if available
-	if (facekit && typeof facekit.enableCamera === "function") {
-		facekit.enableCamera();
+	// Remove Backr background if present
+	if (game._diffMenuBackr) {
+		game._diffMenuBackr.destroy();
+		game._diffMenuBackr = null;
 	}
 	for (var i = 0; i < diffBtns.length; i++) {
 		diffBtns[i].destroy();
 	}