/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	useSpecialCards: false
});

/**** 
* Classes
****/ 
var Card = Container.expand(function (pairId) {
	var self = Container.call(this);
	self.pairId = pairId;
	self.isFlipped = false;
	self.isMatched = false;
	self.back = self.attachAsset('card_back', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var faceAssetId;
	if (pairId === -1) {
		// Dud Card
		faceAssetId = 'dud_card';
	} else if (pairId === -2) {
		// Shifter Card
		faceAssetId = 'shifter_card';
	} else {
		// Normal Card
		faceAssetId = 'card_face_' + pairId;
	}
	self.face = self.attachAsset(faceAssetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.face.visible = false;
	// Public methods must be defined before they are called.
	self.flipUp = function (onComplete) {
		if (self.isFlipped) return;
		self.isFlipped = true;
		LK.getSound('flip').play();
		tween(self, {
			scaleX: 0
		}, {
			duration: 150,
			easing: tween.easeIn,
			onFinish: function onFinish() {
				self.back.visible = false;
				self.face.visible = true;
				tween(self, {
					scaleX: 1
				}, {
					duration: 150,
					easing: tween.easeOut,
					onFinish: onComplete
				});
			}
		});
	};
	self.flipDown = function (onComplete) {
		if (!self.isFlipped) return;
		self.isFlipped = false;
		tween(self, {
			scaleX: 0
		}, {
			duration: 150,
			easing: tween.easeIn,
			onFinish: function onFinish() {
				self.face.visible = false;
				self.back.visible = true;
				tween(self, {
					scaleX: 1
				}, {
					duration: 150,
					easing: tween.easeOut,
					onFinish: onComplete
				});
			}
		});
	};
	self.matchFound = function (onComplete) {
		self.isMatched = true;
		tween(self, {
			alpha: 0,
			scaleX: 1.2,
			scaleY: 1.2
		}, {
			duration: 400,
			easing: tween.easeIn,
			onFinish: onComplete
		});
	};
	self.down = function () {
		handleCardFlip(self);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2c3e50 // Dark slate blue background
});

/**** 
* Game Code
****/ 
//LK Engine will automatically create assets based on usage.
var menuBackground = game.addChild(LK.getAsset('menu_background', {
	x: 1024,
	y: 1366,
	anchorX: 0.5,
	anchorY: 0.5
}));
var boardBackground = game.addChild(LK.getAsset('board_background', {
	x: 1024,
	y: 1366,
	anchorX: 0.5,
	anchorY: 0.5
}));
//Defining 8 pairs of cards + 1 card back.
// Red
// Blue
// Green
// Yellow
// Magenta
// Cyan
// Orange
// Purple
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
LK.setScore(0); // Initialize score
// --- Game Constants ---
var COLS = 4;
var ROWS = 4;
var TOTAL_PAIRS = (COLS * ROWS - 2) / 2; // Subtract 2 for the Shifter and Dud cards
var TOTAL_CARD_FACES = 15;
var CARD_WIDTH = 350;
var CARD_HEIGHT = 350;
var MARGIN = 60;
var gridWidth = COLS * (CARD_WIDTH + MARGIN) - MARGIN;
var gridHeight = ROWS * (CARD_HEIGHT + MARGIN) - MARGIN;
var startX = (2048 - gridWidth) / 2 + CARD_WIDTH / 2;
var startY = (2732 - gridHeight) / 2 + CARD_HEIGHT / 2;
// --- Global UI and Game State Variables ---
var startScreenContainer, boardSizeContainer, leaderboardContainer, gameContainer, victoryScreenContainer;
var specialCardsCheckbox;
var cards = [];
var flippedCards = [];
var matchedPairs = 0;
var canPlay = true;
var streakCount = 0;
var maxStreak = 0;
// --- Screen Management ---
function showStartScreen() {
	if (boardSizeContainer) boardSizeContainer.visible = false;
	if (leaderboardContainer) leaderboardContainer.visible = false;
	if (gameContainer) gameContainer.visible = false;
	if (victoryScreenContainer) victoryScreenContainer.visible = false;
	menuBackground.visible = true;
	boardBackground.visible = false;
	if (!startScreenContainer) {
		startScreenContainer = game.addChild(new Container());
		var title = LK.getAsset('logo', {
			anchorX: 0.5,
			anchorY: 0.5,
			width: 1200,
			height: 300
		});
		title.x = 2048 / 2;
		title.y = 2732 / 2 - 400;
		startScreenContainer.addChild(title);
		var playButton = LK.getAsset('play_button', {
			anchorX: 0.5,
			anchorY: 0.5,
			width: 600,
			height: 200
		});
		playButton.x = 2048 / 2;
		playButton.y = 2732 / 2;
		playButton.down = function () {
			showBoardSizeSelection();
		};
		startScreenContainer.addChild(playButton);
		var leaderboardButton = LK.getAsset('leaderboard_button', {
			anchorX: 0.5,
			anchorY: 0.5,
			width: 600,
			height: 200
		});
		leaderboardButton.x = 2048 / 2;
		leaderboardButton.y = 2732 / 2 + 250;
		leaderboardButton.down = function () {
			showLeaderboard();
		};
		startScreenContainer.addChild(leaderboardButton);
	}
	startScreenContainer.visible = true;
	scoreTxt.visible = false;
}
function updateSpecialCardsButtonAppearance() {
	if (storage.useSpecialCards) {
		// Add white sheen when enabled (tint to a lighter color)
		tween(specialCardsCheckbox, {
			tint: 0xFFFFFF
		}, {
			duration: 200,
			easing: tween.easeOut
		});
	} else {
		// Remove sheen when disabled (tint to normal, e.g. light gray or no tint)
		tween(specialCardsCheckbox, {
			tint: 0xCCCCCC
		}, {
			duration: 200,
			easing: tween.easeOut
		});
	}
}
function showBoardSizeSelection() {
	if (startScreenContainer) startScreenContainer.visible = false;
	if (leaderboardContainer) leaderboardContainer.visible = false;
	if (gameContainer) gameContainer.visible = false;
	if (victoryScreenContainer) victoryScreenContainer.visible = false;
	menuBackground.visible = true;
	boardBackground.visible = false;
	if (!boardSizeContainer) {
		boardSizeContainer = game.addChild(new Container());
		var dialogBox = LK.getAsset('dialog_box', {
			x: 2048 / 2,
			y: 2732 / 2,
			anchorX: 0.5,
			anchorY: 0.5
		});
		boardSizeContainer.addChild(dialogBox);
		var content = [];
		var title = new Text2('Select Board Size', {
			size: 120,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		title.anchor.set(0.5, 0.5);
		title.x = 2048 / 2;
		title.y = 2732 / 2 - 400;
		boardSizeContainer.addChild(title);
		content.push(title);
		var size4x4Button = new Text2('4x4', {
			size: 100,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		size4x4Button.anchor.set(0.5, 0.5);
		size4x4Button.x = 2048 / 2;
		size4x4Button.y = 2732 / 2 - 100;
		size4x4Button.down = function () {
			setBoardSize(4, 4);
			startGame();
		};
		boardSizeContainer.addChild(size4x4Button);
		content.push(size4x4Button);
		var size4x5Button = new Text2('4x5', {
			size: 100,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		size4x5Button.anchor.set(0.5, 0.5);
		size4x5Button.x = 2048 / 2;
		size4x5Button.y = 2732 / 2 + 50;
		size4x5Button.down = function () {
			setBoardSize(4, 5);
			startGame();
		};
		boardSizeContainer.addChild(size4x5Button);
		content.push(size4x5Button);
		var size4x6Button = new Text2('4x6', {
			size: 100,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		size4x6Button.anchor.set(0.5, 0.5);
		size4x6Button.x = 2048 / 2;
		size4x6Button.y = 2732 / 2 + 200;
		size4x6Button.down = function () {
			setBoardSize(4, 6);
			startGame();
		};
		boardSizeContainer.addChild(size4x6Button);
		content.push(size4x6Button);
		specialCardsCheckbox = LK.getAsset('jumble_tile', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 2048 / 2,
			y: 2732 / 2 + 300
		});
		specialCardsCheckbox.down = function () {
			storage.useSpecialCards = !storage.useSpecialCards;
			updateSpecialCardsButtonAppearance();
		};
		boardSizeContainer.addChild(specialCardsCheckbox);
		content.push(specialCardsCheckbox);
		// Set initial tint to match state before animating
		if (storage.useSpecialCards) {
			specialCardsCheckbox.tint = 0xFFFFFF;
		} else {
			specialCardsCheckbox.tint = 0xCCCCCC;
		}
		// Initialize button appearance based on current setting
		updateSpecialCardsButtonAppearance();
		// Add help button for special cards
		var helpButton = new Text2('?', {
			size: 80,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		helpButton.anchor.set(0.0, 0.5);
		// Position the help button at the end of the jumble tile button
		helpButton.x = specialCardsCheckbox.x + specialCardsCheckbox.width / 2 + 30;
		helpButton.y = specialCardsCheckbox.y;
		helpButton.down = function () {
			// Show a simple popup with instructions
			if (boardSizeContainer.helpPopup) {
				boardSizeContainer.helpPopup.visible = true;
				return;
			}
			var popup = new Container();
			var popupBg = LK.getAsset('dialog_box', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: 2048 / 2,
				y: 2732 / 2,
				width: 1200,
				height: 600
			});
			popup.addChild(popupBg);
			var helpText = new Text2("Special Cards:\n- The Shifter card reveals and shuffles all remaining cards before disappearing.\n- The Dud card disappears when flipped and does not give points or require a match.", {
				size: 60,
				fill: 0x000000,
				wordWrap: true,
				wordWrapWidth: 1000
			});
			helpText.anchor.set(0.5, 0.5);
			helpText.x = 2048 / 2;
			helpText.y = 2732 / 2 - 60;
			popup.addChild(helpText);
			var closeBtn = new Text2('Close', {
				size: 80,
				fill: 0x000000,
				fontWeight: 'bold'
			});
			closeBtn.anchor.set(0.5, 0.5);
			closeBtn.x = 2048 / 2;
			closeBtn.y = 2732 / 2 + 180;
			closeBtn.down = function () {
				popup.visible = false;
			};
			popup.addChild(closeBtn);
			boardSizeContainer.addChild(popup);
			boardSizeContainer.helpPopup = popup;
		};
		boardSizeContainer.addChild(helpButton);
		content.push(helpButton);
		var backButton = new Text2('Back', {
			size: 80,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		backButton.anchor.set(0.5, 0.5);
		backButton.x = 2048 / 2;
		backButton.y = 2732 / 2 + 450;
		backButton.down = function () {
			showStartScreen();
		};
		boardSizeContainer.addChild(backButton);
		content.push(backButton);
		var minY = Infinity;
		var maxY = -Infinity;
		var maxWidth = 0;
		for (var i = 0; i < content.length; i++) {
			var text = content[i];
			var top = text.y - text.height * text.anchor.y;
			var bottom = text.y + text.height * (1 - text.anchor.y);
			if (top < minY) minY = top;
			if (bottom > maxY) maxY = bottom;
			if (text.width > maxWidth) maxWidth = text.width;
		}
		var PADDING_Y = 100;
		var PADDING_X = 150;
		dialogBox.height = (maxY - minY + PADDING_Y * 2) * 1.1;
		dialogBox.width = maxWidth + PADDING_X * 2;
		dialogBox.y = minY + (maxY - minY) / 2;
	}
	// Special cards checkbox is now an image button - no text to update
	boardSizeContainer.visible = true;
	scoreTxt.visible = false;
}
function setBoardSize(cols, rows) {
	COLS = cols;
	ROWS = rows;
	if (storage.useSpecialCards === true) {
		TOTAL_PAIRS = (COLS * ROWS - 2) / 2;
	} else {
		TOTAL_PAIRS = COLS * ROWS / 2;
	}
	gridWidth = COLS * (CARD_WIDTH + MARGIN) - MARGIN;
	gridHeight = ROWS * (CARD_HEIGHT + MARGIN) - MARGIN;
	startX = (2048 - gridWidth) / 2 + CARD_WIDTH / 2;
	startY = (2732 - gridHeight) / 2 + CARD_HEIGHT / 2;
}
function showLeaderboard() {
	if (startScreenContainer) startScreenContainer.visible = false;
	if (boardSizeContainer) boardSizeContainer.visible = false;
	menuBackground.visible = true;
	boardBackground.visible = false;
	if (!leaderboardContainer) {
		leaderboardContainer = game.addChild(new Container());
		var dialogBox = LK.getAsset('dialog_box', {
			x: 2048 / 2,
			y: 2732 / 2,
			anchorX: 0.5,
			anchorY: 0.5
		});
		leaderboardContainer.addChild(dialogBox);
		var content = [];
		var title = new Text2('Leaderboard', {
			size: 150,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		title.anchor.set(0.5, 0.5);
		title.x = 2048 / 2;
		title.y = 2732 / 2 - 600;
		leaderboardContainer.addChild(title);
		content.push(title);
		var header = new Text2('RANK  USER    SCORE  STREAK', {
			size: 70,
			fill: 0x000000
		});
		header.anchor.set(0.5, 0.5);
		header.x = 2048 / 2;
		header.y = 2732 / 2 - 300;
		leaderboardContainer.addChild(header);
		content.push(header);
		var highScore = storage.highScore || 0;
		var highScoreStreak = storage.highScoreStreak || 0;
		var userLine = new Text2('1      You      ' + highScore + '      ' + highScoreStreak, {
			size: 90,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		userLine.anchor.set(0.5, 0.5);
		userLine.x = 2048 / 2;
		userLine.y = 2732 / 2 - 150;
		leaderboardContainer.addChild(userLine);
		leaderboardContainer.userLine = userLine; // Store reference
		content.push(userLine);
		var backButton = new Text2('Back', {
			size: 100,
			fill: 0x000000,
			fontWeight: 'bold'
		});
		backButton.anchor.set(0.5, 0.5);
		backButton.x = 2048 / 2;
		backButton.y = 2732 / 2 + 300;
		backButton.down = function () {
			showStartScreen();
		};
		leaderboardContainer.addChild(backButton);
		content.push(backButton);
		var minY = Infinity;
		var maxY = -Infinity;
		var maxWidth = 0;
		for (var i = 0; i < content.length; i++) {
			var text = content[i];
			var top = text.y - text.height * text.anchor.y;
			var bottom = text.y + text.height * (1 - text.anchor.y);
			if (top < minY) minY = top;
			if (bottom > maxY) maxY = bottom;
			if (text.width > maxWidth) maxWidth = text.width;
		}
		var PADDING_Y = 100;
		var PADDING_X = 150;
		dialogBox.height = (maxY - minY + PADDING_Y * 2) * 1.1;
		dialogBox.width = maxWidth + PADDING_X * 2;
		dialogBox.y = minY + (maxY - minY) / 2;
	} else {
		var highScore = storage.highScore || 0;
		var highScoreStreak = storage.highScoreStreak || 0;
		leaderboardContainer.userLine.setText('1      You      ' + highScore + '      ' + highScoreStreak);
	}
	leaderboardContainer.visible = true;
	scoreTxt.visible = false;
}
function showVictoryScreen() {
	if (gameContainer) gameContainer.visible = false;
	if (boardSizeContainer) boardSizeContainer.visible = false;
	scoreTxt.visible = false;
	menuBackground.visible = true;
	boardBackground.visible = false;
	if (!victoryScreenContainer) {
		victoryScreenContainer = game.addChild(new Container());
		var title = new Text2('You Win!', {
			size: 150,
			fill: 0xFFD700
		});
		title.anchor.set(0.5, 0.5);
		title.x = 2048 / 2;
		title.y = 2732 / 2 - 400;
		victoryScreenContainer.addChild(title);
		var finalScoreText = new Text2('Final Score: ' + LK.getScore(), {
			size: 100,
			fill: 0xFFFFFF,
			fontWeight: 'bold',
			stroke: 0x000000,
			strokeThickness: 8
		});
		finalScoreText.anchor.set(0.5, 0.5);
		finalScoreText.x = 2048 / 2;
		finalScoreText.y = 2732 / 2 - 200;
		victoryScreenContainer.addChild(finalScoreText);
		victoryScreenContainer.finalScoreText = finalScoreText; // To update it later
		var playAgainButton = new Text2('Play Again', {
			size: 100,
			fill: 0xFFFFFF,
			fontWeight: 'bold',
			stroke: 0x000000,
			strokeThickness: 8
		});
		playAgainButton.anchor.set(0.5, 0.5);
		playAgainButton.x = 2048 / 2;
		playAgainButton.y = 2732 / 2;
		playAgainButton.down = function () {
			startGame();
		};
		victoryScreenContainer.addChild(playAgainButton);
		var mainMenuButton = new Text2('Main Menu', {
			size: 100,
			fill: 0xFFFFFF,
			fontWeight: 'bold',
			stroke: 0x000000,
			strokeThickness: 8
		});
		mainMenuButton.anchor.set(0.5, 0.5);
		mainMenuButton.x = 2048 / 2;
		mainMenuButton.y = 2732 / 2 + 200;
		mainMenuButton.down = function () {
			showStartScreen();
		};
		victoryScreenContainer.addChild(mainMenuButton);
	} else {
		victoryScreenContainer.finalScoreText.setText('Final Score: ' + LK.getScore());
	}
	victoryScreenContainer.visible = true;
}
function startGame() {
	if (startScreenContainer) startScreenContainer.visible = false;
	if (boardSizeContainer) boardSizeContainer.visible = false;
	if (leaderboardContainer) leaderboardContainer.visible = false;
	if (victoryScreenContainer) victoryScreenContainer.visible = false;
	menuBackground.visible = false;
	boardBackground.visible = true;
	if (!gameContainer) {
		gameContainer = game.addChild(new Container());
	}
	gameContainer.visible = true;
	// Clear old cards
	for (var i = 0; i < cards.length; i++) {
		cards[i].destroy();
	}
	// Reset game state
	cards = [];
	flippedCards = [];
	matchedPairs = 0;
	canPlay = true;
	streakCount = 0;
	maxStreak = 0;
	LK.setScore(0);
	scoreTxt.setText('Score: ' + LK.getScore());
	scoreTxt.visible = true;
	setupBoard();
}
// --- Game Logic Functions ---
function showStreakAnimation(bonusPoints) {
	var bonusContainer = new Container();
	bonusContainer.x = 2048 / 2;
	bonusContainer.y = 2732 / 2;
	var bonusText = new Text2('BONUS!!!', {
		size: 120,
		fill: 0xFFD700
	});
	bonusText.anchor.set(0.5, 0.5);
	bonusText.y = -70;
	bonusContainer.addChild(bonusText);
	var pointsText = new Text2('+' + bonusPoints, {
		size: 100,
		fill: 0xFFFFFF
	});
	pointsText.anchor.set(0.5, 0.5);
	pointsText.y = 70;
	bonusContainer.addChild(pointsText);
	gameContainer.addChild(bonusContainer);
	// Animate upward movement
	tween(bonusContainer, {
		y: bonusContainer.y - 200
	}, {
		duration: 1000,
		easing: tween.easeOut
	});
	// After 0.5s, start fading out
	LK.setTimeout(function () {
		if (bonusContainer.parent) {
			tween(bonusContainer, {
				alpha: 0
			}, {
				duration: 500,
				// Fades over the last 0.5s
				easing: tween.easeOut,
				onFinish: function onFinish() {
					// Self-destruct after animation. Check parent to avoid errors
					// if the game state was cleared during the animation.
					if (bonusContainer.parent) {
						bonusContainer.destroy();
					}
				}
			});
		}
	}, 500);
}
function checkWinCondition() {
	var remainingCards = 0;
	for (var i = 0; i < cards.length; i++) {
		if (!cards[i].isMatched) {
			remainingCards++;
		}
	}
	if (remainingCards === 0) {
		var highScore = storage.highScore || 0;
		var highScoreStreak = storage.highScoreStreak || 0;
		if (LK.getScore() > highScore) {
			storage.highScore = LK.getScore();
			storage.highScoreStreak = maxStreak;
		}
		LK.getSound('win').play();
		LK.setTimeout(function () {
			showVictoryScreen();
		}, 200);
	}
}
function handleDudCard(card) {
	card.isMatched = true; // Mark as handled
	// Match the flip down delay of the other card (1000ms)
	LK.setTimeout(function () {
		tween(card, {
			alpha: 0
		}, {
			duration: 400,
			onFinish: function onFinish() {
				checkWinCondition();
				canPlay = true;
			}
		});
	}, 1000);
}
function flipAllDownAndEndTurn(cardsToFlip) {
	var flipCount = 0;
	if (cardsToFlip.length === 0) {
		checkWinCondition();
		canPlay = true;
		return;
	}
	cardsToFlip.forEach(function (c) {
		c.flipDown(function () {
			flipCount++;
			if (flipCount === cardsToFlip.length) {
				checkWinCondition();
				canPlay = true;
			}
		});
	});
}
function startShuffleAnimation(shifterCard, otherCards, originalPositions) {
	var newPositions = shuffle(originalPositions);
	tween(shifterCard, {
		alpha: 0
	}, {
		duration: 400,
		onFinish: function onFinish() {
			// Card is visually gone and marked as matched.
		}
	});
	var moveCount = 0;
	if (otherCards.length === 0) {
		flipAllDownAndEndTurn([]);
		return;
	}
	otherCards.forEach(function (c, i) {
		tween(c, {
			x: newPositions[i].x,
			y: newPositions[i].y
		}, {
			duration: 800,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				moveCount++;
				if (moveCount === otherCards.length) {
					// All cards moved, now flip them back down
					flipAllDownAndEndTurn(otherCards);
				}
			}
		});
	});
}
function handleShifterCard(card) {
	card.isMatched = true; // Mark as handled
	var otherCards = cards.filter(function (c) {
		return c !== card && !c.isMatched;
	});
	if (otherCards.length === 0) {
		handleDudCard(card); // Behaves like a dud card if no other cards are on board
		return;
	}
	var originalPositions = [];
	otherCards.forEach(function (c) {
		originalPositions.push({
			x: c.x,
			y: c.y
		});
	});
	var revealCount = 0;
	otherCards.forEach(function (c) {
		c.flipUp(function () {
			revealCount++;
			if (revealCount === otherCards.length) {
				LK.setTimeout(function () {
					startShuffleAnimation(card, otherCards, originalPositions);
				}, 800); // Pause to let player see cards
			}
		});
	});
}
function handleCardFlip(card) {
	if (!canPlay || card.isFlipped || card.isMatched) {
		return;
	}
	// Handle special cards immediately
	if (card.pairId < 0) {
		canPlay = false;
		// If a normal card is already flipped, flip it back down before handling the special card
		if (flippedCards.length === 1) {
			var otherCard = flippedCards[0];
			otherCard.flipDown(function () {
				flippedCards = [];
				card.flipUp(function () {
					if (card.pairId === -1) {
						handleDudCard(card);
					} else if (card.pairId === -2) {
						handleShifterCard(card);
					}
				});
			});
		} else {
			flippedCards = []; // Clear any single-flipped normal card
			card.flipUp(function () {
				if (card.pairId === -1) {
					handleDudCard(card);
				} else if (card.pairId === -2) {
					handleShifterCard(card);
				}
			});
		}
		return;
	}
	// Prevent flipping a third card
	if (flippedCards.length >= 2) {
		return;
	}
	flippedCards.push(card);
	card.flipUp(function () {
		if (flippedCards.length === 2) {
			canPlay = false;
			checkMatch();
		}
	});
}
function checkMatch() {
	var card1 = flippedCards[0];
	var card2 = flippedCards[1];
	if (card1.pairId === card2.pairId) {
		matchedPairs++;
		streakCount++;
		if (streakCount > maxStreak) {
			maxStreak = streakCount;
		}
		// Calculate points based on streak
		var points = 10;
		var bonusPoints = 0;
		if (streakCount === 2) {
			points = 20;
			bonusPoints = 10;
		} else if (streakCount >= 3) {
			points = 30;
			bonusPoints = 20;
		}
		if (bonusPoints > 0) {
			showStreakAnimation(bonusPoints);
		}
		LK.setScore(LK.getScore() + points);
		scoreTxt.setText('Score: ' + LK.getScore());
		LK.setTimeout(function () {
			LK.getSound('match').play();
			card1.matchFound();
			card2.matchFound(function () {
				resetTurn();
				checkWinCondition();
			});
		}, 750);
	} else {
		// Reset streak on miss
		streakCount = 0;
		LK.setTimeout(function () {
			card1.flipDown();
			card2.flipDown(function () {
				resetTurn();
			});
		}, 1000);
	}
}
function resetTurn() {
	flippedCards = [];
	canPlay = true;
}
function shuffle(array) {
	var currentIndex = array.length,
		randomIndex;
	while (currentIndex !== 0) {
		randomIndex = Math.floor(Math.random() * currentIndex);
		currentIndex--;
		var _ref = [array[randomIndex], array[currentIndex]];
		array[currentIndex] = _ref[0];
		array[randomIndex] = _ref[1];
	}
	return array;
}
function isLayoutValid(grid) {
	for (var row = 0; row < ROWS; row++) {
		for (var col = 0; col < COLS; col++) {
			var currentPairId = grid[row][col];
			// Check all 8 neighbors
			for (var dr = -1; dr <= 1; dr++) {
				for (var dc = -1; dc <= 1; dc++) {
					if (dr === 0 && dc === 0) continue; // Don't check self
					var neighborRow = row + dr;
					var neighborCol = col + dc;
					if (neighborRow >= 0 && neighborRow < ROWS && neighborCol >= 0 && neighborCol < COLS) {
						if (grid[neighborRow][neighborCol] === currentPairId) {
							return false; // Found an adjacent match
						}
					}
				}
			}
		}
	}
	return true; // No adjacent matches found
}
// --- Board Setup ---
function setupBoard() {
	var pairIds = [];
	// Create a list of all available card face IDs (0 to TOTAL_CARD_FACES-1)
	var allFaceIndices = [];
	for (var i = 0; i < TOTAL_CARD_FACES; i++) {
		allFaceIndices.push(i);
	}
	// Shuffle the available faces and select enough for the board
	shuffle(allFaceIndices);
	var gameFaceIndices = allFaceIndices.slice(0, TOTAL_PAIRS);
	// Create pairs from the selected faces
	for (var i = 0; i < TOTAL_PAIRS; i++) {
		pairIds.push(gameFaceIndices[i], gameFaceIndices[i]);
	}
	// Add the special cards if enabled
	if (storage.useSpecialCards === true) {
		pairIds.push(-1); // Dud Card
		pairIds.push(-2); // Shifter Card
	}
	var grid = [];
	var attempts = 0;
	var maxAttempts = 100; // Safeguard to prevent infinite loop
	do {
		shuffle(pairIds);
		// Create a 2D grid from the shuffled IDs
		for (var r = 0; r < ROWS; r++) {
			grid[r] = [];
			for (var c = 0; c < COLS; c++) {
				grid[r][c] = pairIds[r * COLS + c];
			}
		}
		attempts++;
	} while (!isLayoutValid(grid) && attempts < maxAttempts);
	// Create cards from the final grid layout
	for (var row = 0; row < ROWS; row++) {
		for (var col = 0; col < COLS; col++) {
			var pairId = grid[row][col];
			var card = new Card(pairId);
			card.x = startX + col * (CARD_WIDTH + MARGIN);
			card.y = startY + row * (CARD_HEIGHT + MARGIN);
			cards.push(card);
			gameContainer.addChild(card);
		}
	}
}
// --- Initial Call ---
showStartScreen();