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

/**** 
* Classes
****/ 
var Block = Container.expand(function (type) {
	var self = Container.call(this);
	self.type = type;
	self.value = getBlockValue(type);
	var blockGraphics = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	function getTextSize(value) {
		var baseSize = 192; // 50% of cell height
		var numDigits = value.toString().length;
		if (numDigits <= 2) return baseSize;
		if (numDigits === 3) return baseSize * 0.8;
		if (numDigits === 4) return baseSize * 0.6;
		return baseSize * 0.5;
	}
	var blockText = new Text2(self.value.toString(), {
		size: getTextSize(self.value),
		fill: 0xFFFFFF,
		fontWeight: 'bold',
		dropShadow: true,
		dropShadowColor: 0x000000,
		dropShadowBlur: 4,
		dropShadowDistance: 2
	});
	blockText.anchor.set(0.5, 0.5);
	self.addChild(blockText);
	self.setType = function (newType) {
		self.type = newType;
		self.value = getBlockValue(newType);
		self.removeChild(blockGraphics);
		blockGraphics = self.attachAsset(newType, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		blockText.setText(self.value.toString());
		blockText.style.fontSize = getTextSize(self.value);
	};
	return self;
});
var GridCell = Container.expand(function () {
	var self = Container.call(this);
	var cellGraphics = self.attachAsset('gridCell', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.block = null;
	self.setBlock = function (block) {
		if (self.block) {
			self.removeChild(self.block);
		}
		self.block = block;
		if (block) {
			self.addChild(block);
			block.x = 0;
			block.y = 0;
		}
	};
	self.hasBlock = function () {
		return self.block !== null;
	};
	self.clearBlock = function () {
		if (self.block) {
			self.removeChild(self.block);
			self.block = null;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2F4F2F
});

/**** 
* Game Code
****/ 
var GRID_SIZE = 4;
var CELL_SIZE = Math.floor(2048 * 0.75 / GRID_SIZE);
var CELL_SPACING = CELL_SIZE + 10;
var blockTypes = ['wood', 'stone', 'iron', 'gold', 'diamond', 'emerald', 'netherite', 'obsidian', 'bedrock', 'enderite', 'voidstone'];
var grid = [];
var isMoving = false;
var gameOver = false;
function getBlockValue(type) {
	var values = {
		'wood': 2,
		'stone': 4,
		'iron': 8,
		'gold': 16,
		'diamond': 32,
		'emerald': 64,
		'netherite': 128,
		'obsidian': 256,
		'bedrock': 512,
		'enderite': 1024,
		'voidstone': 2048
	};
	return values[type] || 2;
}
function getNextBlockType(currentType) {
	var index = blockTypes.indexOf(currentType);
	if (index < blockTypes.length - 1) {
		return blockTypes[index + 1];
	}
	return currentType;
}
function getRandomBlockType() {
	var types = ['wood', 'wood', 'wood', 'stone', 'stone', 'iron'];
	return types[Math.floor(Math.random() * types.length)];
}
// Create grid
var gridContainer = new Container();
game.addChild(gridContainer);
for (var row = 0; row < GRID_SIZE; row++) {
	grid[row] = [];
	for (var col = 0; col < GRID_SIZE; col++) {
		var cell = new GridCell();
		cell.x = col * CELL_SPACING;
		cell.y = row * CELL_SPACING;
		gridContainer.addChild(cell);
		grid[row][col] = cell;
	}
}
// Center grid
gridContainer.x = (2048 - (GRID_SIZE - 1) * CELL_SPACING) / 2;
gridContainer.y = (2732 - (GRID_SIZE - 1) * CELL_SPACING) / 2;
// Score display
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 100;
// Game over text
var gameOverTxt = new Text2('Game Over!', {
	size: 120,
	fill: 0xFF0000
});
gameOverTxt.anchor.set(0.5, 0.5);
gameOverTxt.visible = false;
LK.gui.center.addChild(gameOverTxt);
function addRandomBlock() {
	var emptyCells = [];
	for (var row = 0; row < GRID_SIZE; row++) {
		for (var col = 0; col < GRID_SIZE; col++) {
			if (!grid[row][col].hasBlock()) {
				emptyCells.push({
					row: row,
					col: col
				});
			}
		}
	}
	if (emptyCells.length > 0) {
		var randomCell = emptyCells[Math.floor(Math.random() * emptyCells.length)];
		var newBlock = new Block(getRandomBlockType());
		grid[randomCell.row][randomCell.col].setBlock(newBlock);
		// Scale animation
		newBlock.scaleX = 0;
		newBlock.scaleY = 0;
		tween(newBlock, {
			scaleX: 1,
			scaleY: 1
		}, {
			duration: 200,
			easing: tween.easeOut
		});
	}
}
function canMove() {
	// Check if any moves are possible
	for (var row = 0; row < GRID_SIZE; row++) {
		for (var col = 0; col < GRID_SIZE; col++) {
			if (!grid[row][col].hasBlock()) {
				return true;
			}
			var currentBlock = grid[row][col].block;
			// Check adjacent cells for possible merges
			var directions = [{
				dr: 0,
				dc: 1
			}, {
				dr: 0,
				dc: -1
			}, {
				dr: 1,
				dc: 0
			}, {
				dr: -1,
				dc: 0
			}];
			for (var d = 0; d < directions.length; d++) {
				var newRow = row + directions[d].dr;
				var newCol = col + directions[d].dc;
				if (newRow >= 0 && newRow < GRID_SIZE && newCol >= 0 && newCol < GRID_SIZE) {
					var adjacentCell = grid[newRow][newCol];
					if (!adjacentCell.hasBlock() || adjacentCell.block.type === currentBlock.type) {
						return true;
					}
				}
			}
		}
	}
	return false;
}
function slideBlocks(direction) {
	if (isMoving || gameOver) return;
	var moved = false;
	var merged = [];
	// Initialize merged array
	for (var row = 0; row < GRID_SIZE; row++) {
		merged[row] = [];
		for (var col = 0; col < GRID_SIZE; col++) {
			merged[row][col] = false;
		}
	}
	isMoving = true;
	if (direction === 'left' || direction === 'right') {
		for (var row = 0; row < GRID_SIZE; row++) {
			var line = [];
			var positions = [];
			// Extract blocks from row
			if (direction === 'left') {
				for (var col = 0; col < GRID_SIZE; col++) {
					if (grid[row][col].hasBlock()) {
						line.push(grid[row][col].block);
						positions.push(col);
						grid[row][col].clearBlock();
					}
				}
			} else {
				for (var col = GRID_SIZE - 1; col >= 0; col--) {
					if (grid[row][col].hasBlock()) {
						line.push(grid[row][col].block);
						positions.push(col);
						grid[row][col].clearBlock();
					}
				}
			}
			// Merge identical adjacent blocks
			for (var i = 0; i < line.length - 1; i++) {
				if (line[i] && line[i + 1] && line[i].type === line[i + 1].type) {
					var nextType = getNextBlockType(line[i].type);
					line[i].setType(nextType);
					LK.setScore(LK.getScore() + getBlockValue(nextType));
					line[i + 1].destroy();
					line[i + 1] = null;
					moved = true;
					LK.getSound('merge').play();
				}
			}
			// Remove null elements
			line = line.filter(function (block) {
				return block !== null;
			});
			// Place blocks back
			if (direction === 'left') {
				for (var i = 0; i < line.length; i++) {
					grid[row][i].setBlock(line[i]);
					if (positions[i] !== i) moved = true;
				}
			} else {
				for (var i = 0; i < line.length; i++) {
					grid[row][GRID_SIZE - 1 - i].setBlock(line[i]);
					if (positions[i] !== GRID_SIZE - 1 - i) moved = true;
				}
			}
		}
	} else {
		for (var col = 0; col < GRID_SIZE; col++) {
			var line = [];
			var positions = [];
			// Extract blocks from column
			if (direction === 'up') {
				for (var row = 0; row < GRID_SIZE; row++) {
					if (grid[row][col].hasBlock()) {
						line.push(grid[row][col].block);
						positions.push(row);
						grid[row][col].clearBlock();
					}
				}
			} else {
				for (var row = GRID_SIZE - 1; row >= 0; row--) {
					if (grid[row][col].hasBlock()) {
						line.push(grid[row][col].block);
						positions.push(row);
						grid[row][col].clearBlock();
					}
				}
			}
			// Merge identical adjacent blocks
			for (var i = 0; i < line.length - 1; i++) {
				if (line[i] && line[i + 1] && line[i].type === line[i + 1].type) {
					var nextType = getNextBlockType(line[i].type);
					line[i].setType(nextType);
					LK.setScore(LK.getScore() + getBlockValue(nextType));
					line[i + 1].destroy();
					line[i + 1] = null;
					moved = true;
					LK.getSound('merge').play();
				}
			}
			// Remove null elements
			line = line.filter(function (block) {
				return block !== null;
			});
			// Place blocks back
			if (direction === 'up') {
				for (var i = 0; i < line.length; i++) {
					grid[i][col].setBlock(line[i]);
					if (positions[i] !== i) moved = true;
				}
			} else {
				for (var i = 0; i < line.length; i++) {
					grid[GRID_SIZE - 1 - i][col].setBlock(line[i]);
					if (positions[i] !== GRID_SIZE - 1 - i) moved = true;
				}
			}
		}
	}
	if (moved) {
		LK.getSound('slide').play();
		scoreTxt.setText('Score: ' + LK.getScore());
		LK.setTimeout(function () {
			addRandomBlock();
			if (!canMove()) {
				gameOver = true;
				gameOverTxt.visible = true;
				LK.setTimeout(function () {
					LK.showGameOver();
				}, 1500);
			}
			isMoving = false;
		}, 100);
	} else {
		isMoving = false;
	}
}
var startX = 0;
var startY = 0;
var isDragging = false;
game.down = function (x, y, obj) {
	if (obj.event && obj.event.preventDefault) {
		obj.event.preventDefault();
		obj.event.stopPropagation();
	}
	startX = x;
	startY = y;
	isDragging = true;
};
game.up = function (x, y, obj) {
	if (obj.event && obj.event.preventDefault) {
		obj.event.preventDefault();
		obj.event.stopPropagation();
	}
	if (!isDragging) return;
	var deltaX = x - startX;
	var deltaY = y - startY;
	var threshold = 50;
	if (Math.abs(deltaX) > Math.abs(deltaY) && Math.abs(deltaX) > threshold) {
		if (deltaX > 0) {
			slideBlocks('right');
		} else {
			slideBlocks('left');
		}
	} else if (Math.abs(deltaY) > threshold) {
		if (deltaY > 0) {
			slideBlocks('down');
		} else {
			slideBlocks('up');
		}
	}
	isDragging = false;
};
game.move = function (x, y, obj) {
	if (isDragging && obj.event && obj.event.preventDefault) {
		obj.event.preventDefault();
		obj.event.stopPropagation();
	}
};
// Touch/swipe controls are handled by game.down, game.up, and game.move events above
// Initialize with two random blocks
addRandomBlock();
addRandomBlock();
game.update = function () {
	// Game logic is handled by events
};