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

/**** 
* Classes
****/ 
// LetterBubble: A bubble with a letter inside, touchable
var LetterBubble = Container.expand(function () {
	var self = Container.call(this);
	// Properties to be set after creation:
	// self.letter (string, e.g. "A")
	// self.isTarget (bool, is this the correct letter to pop?)
	// We'll assign a color randomly from the available bubble assets
	// Pick a random bubble color asset for the background
	var bubbleAssetIds = ['bubbleBlue', 'bubbleGreen', 'bubbleRed', 'bubbleYellow', 'bubblePurple', 'bubbleOrange'];
	var bubbleIdx = Math.floor(Math.random() * bubbleAssetIds.length);
	self.bubbleBg = LK.getAsset(bubbleAssetIds[bubbleIdx], {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(self.bubbleBg);
	// Letter color should contrast with bubble color for readability
	self.letterText = new Text2('A', {
		size: 120,
		fill: 0xFFFFFF,
		font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
	});
	self.letterText.anchor.set(0.5, 0.5);
	// Add a subtle drop shadow for pop
	self.letterText.setStyle({
		dropShadow: true,
		dropShadowColor: "#222",
		dropShadowBlur: 8,
		dropShadowDistance: 4
	});
	self.addChild(self.letterText);
	// Animate in (pop effect)
	self.scale.set(0.1, 0.1);
	tween(self.scale, {
		x: 1,
		y: 1
	}, {
		duration: 300,
		easing: tween.elasticOut
	});
	// Touch event
	self.down = function (x, y, obj) {
		// Only allow popping if not already popped
		if (self.popped) {
			return;
		}
		self.popped = true;
		onBubbleTapped(self);
	};
	// Pop animation
	self.pop = function (_onFinish) {
		// Play pop sound
		LK.getSound('pop').play();
		// Animate: scale up, fade out, then destroy
		tween(self.scale, {
			x: 1.3,
			y: 1.3
		}, {
			duration: 120,
			easing: tween.easeOut
		});
		tween(self, {
			alpha: 0
		}, {
			duration: 180,
			delay: 100,
			onFinish: function onFinish() {
				if (_onFinish) {
					_onFinish();
				}
				self.destroy();
			}
		});
	};
	// Gentle shake for incorrect
	self.shake = function () {
		// Animate left-right shake
		var origX = self.x;
		tween(self, {
			x: origX - 20
		}, {
			duration: 60,
			easing: tween.easeIn,
			onFinish: function onFinish() {
				tween(self, {
					x: origX + 20
				}, {
					duration: 60,
					easing: tween.easeOut,
					onFinish: function onFinish() {
						tween(self, {
							x: origX
						}, {
							duration: 60
						});
					}
				});
			}
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xE3F6FD // Light blue background for kid-friendly look
});

/**** 
* Game Code
****/ 
// Alphabet array
// Letter bubbles: We'll use colored ellipses for bubbles, and overlay Text2 for letters.
// We'll use 26 different colors for variety, but for MVP, 5-6 colors are enough and can be reused.
// Sounds for correct/incorrect feedback
// Simple celebratory sound for win
var alphabet = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"];
// Game state
var currentLetterIdx = 0; // Index in alphabet for the current target letter
var bubbles = []; // Array of LetterBubble instances
var lettersPerRound = 4; // Start with 4, will increase as player gets correct answers
var correctInARow = 0; // Track correct answers in a row for difficulty
var roundActive = false; // Is a round currently active?
var score = 0; // Number of correct letters popped
// Endless mode: after all letters, reshuffle and continue
var endlessMode = true;
// Timer variables
var timerActive = false;
var timerValue = 0; // seconds left
var timerInterval = null;
var TIMER_START = 15; // seconds to start with when timer mode begins
var TIMER_ADD = 3; // seconds to add per correct answer
// High score
var highScore = storage.letterpop_highscore || 0;
// UI elements
var promptText = new Text2('', {
	size: 110,
	fill: 0x333333,
	font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
});
promptText.anchor.set(0.5, 0);
LK.gui.top.addChild(promptText);
var scoreText = new Text2('0', {
	size: 110,
	fill: 0x4A90E2,
	font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
});
scoreText.anchor.set(0.5, 1);
scoreText.y = -40; // Raise it a bit above the very bottom
LK.gui.bottom.addChild(scoreText);
// High score text (top center, under prompt)
var highScoreText = new Text2('High: ' + highScore, {
	size: 60,
	fill: 0x888888,
	font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
});
highScoreText.anchor.set(0.5, 0);
highScoreText.y = 100;
LK.gui.top.addChild(highScoreText);
// Timer text (bottom center, just above score)
var timerText = new Text2('', {
	size: 80,
	fill: 0xD0021B,
	font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
});
timerText.anchor.set(0.5, 1);
timerText.y = -160; // Place above the scoreText (scoreText is at -40)
LK.gui.bottom.addChild(timerText);
// Timer change effect (shows +2s/-1s)
var timerChangeText = new Text2('', {
	size: 70,
	fill: 0x43A047,
	font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
});
timerChangeText.anchor.set(0.5, 1);
timerChangeText.alpha = 0;
timerChangeText.y = timerText.y - 80; // Just above timerText
LK.gui.bottom.addChild(timerChangeText);
// Helper to show timer change effect
function showTimerChangeEffect(text, color) {
	timerChangeText.setText(text);
	timerChangeText.setStyle({
		fill: color
	});
	timerChangeText.alpha = 0;
	timerChangeText.y = timerText.y - 80;
	tween(timerChangeText, {
		alpha: 1,
		y: timerChangeText.y - 40
	}, {
		duration: 200,
		onFinish: function onFinish() {
			LK.setTimeout(function () {
				tween(timerChangeText, {
					alpha: 0
				}, {
					duration: 300
				});
			}, 400);
		}
	});
}
// Feedback text (centered, fades in/out)
var feedbackText = new Text2('', {
	size: 130,
	fill: 0x43A047,
	font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
});
feedbackText.anchor.set(0.5, 0.5);
feedbackText.alpha = 0;
LK.gui.center.addChild(feedbackText);
// Helper: Shuffle array (Fisher-Yates)
function shuffleArray(arr) {
	var a = arr.slice();
	for (var i = a.length - 1; i > 0; i--) {
		var j = Math.floor(Math.random() * (i + 1));
		var t = a[i];
		a[i] = a[j];
		a[j] = t;
	}
	return a;
}
// Helper: Start a new round
function startRound() {
	// Remove old bubbles
	for (var i = 0; i < bubbles.length; i++) {
		bubbles[i].destroy();
	}
	bubbles = [];
	if (currentLetterIdx >= alphabet.length) {
		if (endlessMode) {
			// Reshuffle for endless play, keep score and difficulty
			currentLetterIdx = 0;
			// Shuffle alphabet for next endless cycle
			alphabet = shuffleArray(alphabet);
		} else {
			// All letters done!
			showCelebration();
			return;
		}
	}
	roundActive = true;
	// Set prompt
	var targetLetter = alphabet[currentLetterIdx];
	promptText.setText("Find: " + targetLetter);
	// Pick distractor letters (not the target)
	var distractors = [];
	var pool = [];
	for (var i = 0; i < alphabet.length; i++) {
		if (i !== currentLetterIdx) {
			pool.push(alphabet[i]);
		}
	}
	pool = shuffleArray(pool);
	for (var i = 0; i < lettersPerRound - 1; i++) {
		distractors.push(pool[i]);
	}
	// Combine and shuffle
	var roundLetters = distractors.concat([targetLetter]);
	roundLetters = shuffleArray(roundLetters);
	// Dynamically arrange bubbles in a centered grid, scaling and spacing to fit up to 20 bubbles
	var numBubbles = roundLetters.length;
	var maxBubbles = 20;
	var minBubbleSize = 110;
	var maxBubbleSize = 300;
	var minMargin = 24;
	var maxMargin = 60;
	// Calculate grid: try to make it as square as possible
	var cols = Math.ceil(Math.sqrt(numBubbles));
	var rows = Math.ceil(numBubbles / cols);
	// Compute available width/height (leave some padding)
	var padX = 80,
		padY = 200;
	var availW = 2048 - padX * 2;
	var availH = 1800 - padY * 2; // keep bubbles in upper 2/3 of screen
	// Compute max bubble size that fits
	var bubbleSizeW = Math.floor((availW - (cols - 1) * minMargin) / cols);
	var bubbleSizeH = Math.floor((availH - (rows - 1) * minMargin) / rows);
	var bubbleSize = Math.max(minBubbleSize, Math.min(maxBubbleSize, Math.min(bubbleSizeW, bubbleSizeH)));
	// Compute margin to center bubbles
	var marginX = Math.max(minMargin, Math.min(maxMargin, Math.floor((availW - cols * bubbleSize) / Math.max(1, cols - 1))));
	var marginY = Math.max(minMargin, Math.min(maxMargin, Math.floor((availH - rows * bubbleSize) / Math.max(1, rows - 1))));
	// Compute grid start
	var totalGridW = cols * bubbleSize + (cols - 1) * marginX;
	var totalGridH = rows * bubbleSize + (rows - 1) * marginY;
	// Vertically center grid in the middle of the screen, but never closer than 200px to the top
	// 2732 is the screen height. Center the grid, but keep at least 200px from the top and 200px from the bottom.
	var minTop = 200;
	var minBottom = 200;
	var availableHeight = 2732 - minTop - minBottom;
	var gridTop = minTop + Math.max(0, (availableHeight - totalGridH) / 2);
	var startX = (2048 - totalGridW) / 2 + bubbleSize / 2;
	var startY = gridTop + bubbleSize / 2;
	// Place bubbles in grid
	var positions = [];
	for (var i = 0; i < numBubbles; i++) {
		var row = Math.floor(i / cols);
		var col = i % cols;
		positions.push({
			x: startX + col * (bubbleSize + marginX),
			y: startY + row * (bubbleSize + marginY)
		});
	}
	// Create and add bubbles, scale them to fit
	for (var i = 0; i < roundLetters.length; i++) {
		var bubble = new LetterBubble();
		bubble.letter = roundLetters[i];
		bubble.letterText.setText(bubble.letter);
		bubble.isTarget = bubble.letter === targetLetter;
		// Position
		bubble.x = positions[i].x;
		bubble.y = positions[i].y;
		// Scale bubble to fit
		var scale = bubbleSize / 300; // 300 is the asset's base size
		bubble.scale.set(scale, scale);
		// Also scale letter text for readability
		bubble.letterText.setStyle({
			size: Math.floor(120 * scale)
		});
		// Add to game
		game.addChild(bubble);
		bubbles.push(bubble);
	}
}
// Handle bubble tap
function onBubbleTapped(bubble) {
	if (!roundActive) {
		return;
	}
	if (bubble.isTarget) {
		// Correct!
		roundActive = false;
		score++;
		scoreText.setText(score);
		// Update high score if needed
		if (score > highScore) {
			highScore = score;
			highScoreText.setText('High: ' + highScore);
			storage.letterpop_highscore = highScore;
		}
		// Start timer mode after 10 points
		if (!timerActive && score >= 10) {
			// Show warning message as a pop-up in the center for 5 seconds, then fade out slowly before starting timer
			// Hide timer text while warning is shown
			timerText.setText('');
			timerActive = false;
			if (timerInterval) {
				LK.clearInterval(timerInterval);
			}
			// Create the warning popup
			var warningPopup = new Container();
			var warningBg = LK.getAsset('bubbleRed', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: 2048 / 2,
				y: 2732 / 2,
				scaleX: 2.2,
				scaleY: 1.2
			});
			warningPopup.addChild(warningBg);
			var warningText = new Text2("Timer is starting, be careful", {
				size: 120,
				fill: "#fff",
				font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
			});
			warningText.anchor.set(0.5, 0.5);
			warningText.x = 2048 / 2;
			warningText.y = 2732 / 2;
			warningPopup.addChild(warningText);
			warningPopup.alpha = 1;
			LK.gui.center.addChild(warningPopup);
			// Hide prompt text while popup is shown
			promptText.setText("");
			// Wait 5 seconds, then fade out slowly (over 1s), then start timer
			LK.setTimeout(function () {
				tween(warningPopup, {
					alpha: 0
				}, {
					duration: 1000,
					easing: tween.easeOut,
					onFinish: function onFinish() {
						LK.gui.center.removeChild(warningPopup);
						// Start timer after fade out
						timerActive = true;
						timerValue = TIMER_START;
						timerText.setText('Time: ' + timerValue);
						promptText.setText("Find: " + alphabet[currentLetterIdx]);
						timerInterval = LK.setInterval(function () {
							if (!timerActive) {
								return;
							}
							timerValue--;
							timerText.setText('Time: ' + timerValue);
							if (timerValue <= 0) {
								timerValue = 0;
								timerText.setText('Time: 0');
								endGameTimeout();
							}
						}, 1000);
					}
				});
			}, 5000);
		}
		// Add time for correct answer if timer is active
		if (timerActive) {
			timerValue += 2;
			timerText.setText('Time: ' + timerValue);
			showTimerChangeEffect("+2s", "#43A047");
		}
		// Track correct answers in a row for difficulty increase
		if (typeof correctInARow === "undefined") {
			correctInARow = 0;
		}
		correctInARow++;
		// After every two correct answers, increase number of options (up to 20)
		if (correctInARow % 2 === 0) {
			if (typeof lettersPerRound === "undefined") {
				lettersPerRound = 4;
			}
			lettersPerRound = Math.min(lettersPerRound + 1, 20);
		}
		// Feedback
		showFeedback("Great!", "#43A047");
		LK.getSound('ding').play();
		// Pop animation, then next round
		bubble.pop(function () {
			// Remove other bubbles with fade out
			for (var i = 0; i < bubbles.length; i++) {
				if (bubbles[i] !== bubble) {
					tween(bubbles[i], {
						alpha: 0
					}, {
						duration: 200,
						onFinish: function (bub) {
							return function () {
								bub.destroy();
							};
						}(bubbles[i])
					});
				}
			}
			// Next letter after short delay
			LK.setTimeout(function () {
				currentLetterIdx++;
				startRound();
			}, 600);
		});
	} else {
		// Reset streak on incorrect answer
		correctInARow = 0;
		// Incorrect
		showFeedback("Try again!", "#D0021B");
		LK.getSound('oops').play();
		bubble.shake();
		// Subtract 1s for wrong answer if timer is active
		if (timerActive) {
			timerValue = Math.max(0, timerValue - 1);
			timerText.setText('Time: ' + timerValue);
			showTimerChangeEffect("-1s", "#D0021B");
			if (timerValue <= 0) {
				timerValue = 0;
				timerText.setText('Time: 0');
				endGameTimeout();
			}
		}
		// Allow another try (do not end round)
	}
}
// Show feedback text in center, fade in/out
function showFeedback(msg, color) {
	feedbackText.setText(msg);
	// Use setStyle to update fill color safely
	feedbackText.setStyle({
		fill: color
	});
	feedbackText.alpha = 0;
	tween(feedbackText, {
		alpha: 1
	}, {
		duration: 120,
		onFinish: function onFinish() {
			LK.setTimeout(function () {
				tween(feedbackText, {
					alpha: 0
				}, {
					duration: 200
				});
			}, 500);
		}
	});
}
// End game due to timer running out
function endGameTimeout() {
	timerActive = false;
	if (timerInterval) {
		LK.clearInterval(timerInterval);
		timerInterval = null;
	}
	// Remove any remaining bubbles
	for (var i = 0; i < bubbles.length; i++) {
		bubbles[i].destroy();
	}
	bubbles = [];
	promptText.setText("Time's up!");
	feedbackText.setText("Score: " + score);
	feedbackText.setStyle({
		fill: 0xD0021B
	});
	feedbackText.alpha = 0;
	tween(feedbackText, {
		alpha: 1
	}, {
		duration: 300
	});
	// Play oops sound
	LK.getSound('oops').play();
	// Show game over after a short delay (triggers LK's game over popup)
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 1200);
}
// Show celebration screen
function showCelebration() {
	// Remove any remaining bubbles
	for (var i = 0; i < bubbles.length; i++) {
		bubbles[i].destroy();
	}
	bubbles = [];
	promptText.setText("All done!");
	feedbackText.setText("You did it!");
	// Use setStyle to update fill color safely
	feedbackText.setStyle({
		fill: 0xF5A623
	});
	feedbackText.alpha = 0;
	tween(feedbackText, {
		alpha: 1
	}, {
		duration: 300
	});
	// Play cheer sound
	LK.getSound('cheer').play();
	// Show "You Win" after a short delay (triggers LK's win popup)
	LK.setTimeout(function () {
		LK.showYouWin();
	}, 1200);
}
// Start game
function startGame() {
	// Show a visually appealing home screen before the first round
	if (typeof startGame.hasRun === "undefined") {
		var isFarFromOthers = function isFarFromOthers(x, y, minDist) {
			for (var i = 0; i < placedPositions.length; i++) {
				var dx = x - placedPositions[i].x;
				var dy = y - placedPositions[i].y;
				if (Math.sqrt(dx * dx + dy * dy) < minDist) return false;
			}
			return true;
		};
		// Only show on first load, not after game over
		startGame.hasRun = true;
		// Create a custom home screen container
		var homeScreen = new Container();
		// Big colorful title
		var title = new Text2("Letter Pop!", {
			size: 220,
			fill: ["#4A90E2", "#F5A623", "#7ED321", "#D0021B"],
			font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
		});
		title.anchor.set(0.5, 0.5);
		title.x = 2048 / 2;
		title.y = 700;
		homeScreen.addChild(title);
		// Fun subtitle
		var subtitle = new Text2("Pop the right letter bubbles!", {
			size: 90,
			fill: 0x9013FE,
			font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
		});
		subtitle.anchor.set(0.5, 0.5);
		subtitle.x = 2048 / 2;
		subtitle.y = 900;
		homeScreen.addChild(subtitle);
		// (Sample letters removed for a cleaner home screen)
		// Play button
		var playBtn = LK.getAsset('bubbleOrange', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 2048 / 2,
			y: 1550,
			scaleX: 1.3,
			scaleY: 1.3
		});
		homeScreen.addChild(playBtn);
		var playText = new Text2("Play", {
			size: 110,
			fill: "#fff",
			font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
		});
		playText.anchor.set(0.5, 0.5);
		playText.x = playBtn.x;
		playText.y = playBtn.y;
		homeScreen.addChild(playText);
		// Add homeScreen to game
		game.addChild(homeScreen);
		// Play button interaction
		playBtn.down = function () {
			game.removeChild(homeScreen);
			actuallyStartGame();
		};
		playText.down = playBtn.down; // Make text also clickable
		// Don't start the game yet!
		return;
	}
	actuallyStartGame();
	function actuallyStartGame() {
		currentLetterIdx = 0;
		score = 0;
		scoreText.setText(score);
		feedbackText.alpha = 0;
		correctInARow = 0;
		lettersPerRound = 4;
		// Reset timer
		timerActive = false;
		timerValue = 0;
		timerText.setText('');
		if (timerInterval) {
			LK.clearInterval(timerInterval);
			timerInterval = null;
		}
		// Reload high score from storage
		highScore = storage.letterpop_highscore || 0;
		highScoreText.setText('High: ' + highScore);
		startRound();
	}
}
// Start on load
startGame();
// No need for update loop, as all logic is event-driven
// Touchscreen: No drag/move needed, only tap (down) on bubbles
// Make sure no elements are in top-left 100x100 (all UI is top/center/right)

===================================================================
--- original.js
+++ change.js
@@ -349,35 +349,68 @@
 			storage.letterpop_highscore = highScore;
 		}
 		// Start timer mode after 10 points
 		if (!timerActive && score >= 10) {
-			// Show warning message before starting timer
-			promptText.setText("Timer is starting, be careful");
+			// Show warning message as a pop-up in the center for 5 seconds, then fade out slowly before starting timer
 			// Hide timer text while warning is shown
 			timerText.setText('');
 			timerActive = false;
 			if (timerInterval) {
 				LK.clearInterval(timerInterval);
 			}
-			// Wait 2 seconds, then start timer
+			// Create the warning popup
+			var warningPopup = new Container();
+			var warningBg = LK.getAsset('bubbleRed', {
+				anchorX: 0.5,
+				anchorY: 0.5,
+				x: 2048 / 2,
+				y: 2732 / 2,
+				scaleX: 2.2,
+				scaleY: 1.2
+			});
+			warningPopup.addChild(warningBg);
+			var warningText = new Text2("Timer is starting, be careful", {
+				size: 120,
+				fill: "#fff",
+				font: "GillSans-Bold,Impact,'Arial Black',Tahoma"
+			});
+			warningText.anchor.set(0.5, 0.5);
+			warningText.x = 2048 / 2;
+			warningText.y = 2732 / 2;
+			warningPopup.addChild(warningText);
+			warningPopup.alpha = 1;
+			LK.gui.center.addChild(warningPopup);
+			// Hide prompt text while popup is shown
+			promptText.setText("");
+			// Wait 5 seconds, then fade out slowly (over 1s), then start timer
 			LK.setTimeout(function () {
-				timerActive = true;
-				timerValue = TIMER_START;
-				timerText.setText('Time: ' + timerValue);
-				promptText.setText("Find: " + alphabet[currentLetterIdx]);
-				timerInterval = LK.setInterval(function () {
-					if (!timerActive) {
-						return;
+				tween(warningPopup, {
+					alpha: 0
+				}, {
+					duration: 1000,
+					easing: tween.easeOut,
+					onFinish: function onFinish() {
+						LK.gui.center.removeChild(warningPopup);
+						// Start timer after fade out
+						timerActive = true;
+						timerValue = TIMER_START;
+						timerText.setText('Time: ' + timerValue);
+						promptText.setText("Find: " + alphabet[currentLetterIdx]);
+						timerInterval = LK.setInterval(function () {
+							if (!timerActive) {
+								return;
+							}
+							timerValue--;
+							timerText.setText('Time: ' + timerValue);
+							if (timerValue <= 0) {
+								timerValue = 0;
+								timerText.setText('Time: 0');
+								endGameTimeout();
+							}
+						}, 1000);
 					}
-					timerValue--;
-					timerText.setText('Time: ' + timerValue);
-					if (timerValue <= 0) {
-						timerValue = 0;
-						timerText.setText('Time: 0');
-						endGameTimeout();
-					}
-				}, 1000);
-			}, 2000);
+				});
+			}, 5000);
 		}
 		// Add time for correct answer if timer is active
 		if (timerActive) {
 			timerValue += 2;