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

/**** 
* Classes
****/ 
// Block class: represents a block on the grid or in the draggable area
var Block = Container.expand(function () {
	var self = Container.call(this);
	// Block color index: 0=red, 1=green, 2=blue, 3=yellow, 4=purple, 5=white
	self.colorIndex = 0;
	self.gridX = -1; // grid position, -1 if not on grid
	self.gridY = -1;
	self.isOnGrid = false;
	// Attach asset based on colorIndex
	self.setColor = function (idx) {
		self.colorIndex = idx;
		if (self.blockAsset) {
			self.removeChild(self.blockAsset);
		}
		if (self.faceAsset) {
			self.removeChild(self.faceAsset);
		}
		var colorNames = ['red', 'green', 'blue', 'yellow', 'purple', 'white'];
		var assetId = 'block_' + colorNames[idx];
		self.blockAsset = self.attachAsset(assetId, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		// --- Add 3D-like shading and highlights ---
		// Main highlight (top left)
		var highlight = LK.getAsset('block_white', {
			width: 60,
			height: 60,
			anchorX: 0.2,
			anchorY: 0.2,
			x: -36,
			y: -36,
			alpha: 0.18
		});
		self.addChild(highlight);
		// Side shadow (bottom right)
		var shadow = LK.getAsset('block_black', {
			width: 80,
			height: 80,
			anchorX: 0.8,
			anchorY: 0.8,
			x: 36,
			y: 36,
			alpha: 0.10
		});
		self.addChild(shadow);
		// Edge highlight (top edge)
		var edgeHighlight = LK.getAsset('block_white', {
			width: 80,
			height: 16,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: -44,
			alpha: 0.10
		});
		self.addChild(edgeHighlight);
		// Edge shadow (bottom edge)
		var edgeShadow = LK.getAsset('block_black', {
			width: 80,
			height: 16,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: 44,
			alpha: 0.08
		});
		self.addChild(edgeShadow);
		// Add a cute manga face overlay (big manga eyes, highlights, and a bigger smile)
		self.faceAsset = new Container();
		// Manga left eye (big white)
		var eyeL = LK.getAsset('block_white', {
			width: 36,
			height: 36,
			anchorX: 0.5,
			anchorY: 0.5,
			x: -36,
			y: -22,
			alpha: 0.98
		});
		// Manga right eye (big white)
		var eyeR = LK.getAsset('block_white', {
			width: 36,
			height: 36,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 36,
			y: -22,
			alpha: 0.98
		});
		// Left eye pupil (black)
		var pupilL = LK.getAsset('block_black', {
			width: 16,
			height: 16,
			anchorX: 0.5,
			anchorY: 0.5,
			x: -36,
			y: -22,
			alpha: 0.95
		});
		// Right eye pupil (black)
		var pupilR = LK.getAsset('block_black', {
			width: 16,
			height: 16,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 36,
			y: -22,
			alpha: 0.95
		});
		// Left eye highlight (white)
		var eyeHL = LK.getAsset('block_white', {
			width: 7,
			height: 7,
			anchorX: 0.5,
			anchorY: 0.5,
			x: -40,
			y: -28,
			alpha: 0.85
		});
		// Right eye highlight (white)
		var eyeHR = LK.getAsset('block_white', {
			width: 7,
			height: 7,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 32,
			y: -28,
			alpha: 0.85
		});
		// Cheeks
		var cheekL = LK.getAsset('block_red', {
			width: 18,
			height: 10,
			anchorX: 0.5,
			anchorY: 0.5,
			x: -38,
			y: 18,
			alpha: 0.18
		});
		var cheekR = LK.getAsset('block_red', {
			width: 18,
			height: 10,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 38,
			y: 18,
			alpha: 0.18
		});
		// Big smile
		var smileAssetId = typeof LK.assets !== "undefined" && LK.assets && typeof LK.assets['block_black'] !== "undefined" ? 'block_black' : 'block_blue';
		var smile = LK.getAsset(smileAssetId, {
			width: 60,
			height: 16,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: 22,
			alpha: 0.8,
			rotation: 0.08
		});
		// Smile highlight (white, for manga shine)
		var smileHL = LK.getAsset('block_white', {
			width: 18,
			height: 4,
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: 18,
			alpha: 0.18,
			rotation: 0.08
		});
		self.faceAsset.addChild(eyeL);
		self.faceAsset.addChild(eyeR);
		self.faceAsset.addChild(pupilL);
		self.faceAsset.addChild(pupilR);
		self.faceAsset.addChild(eyeHL);
		self.faceAsset.addChild(eyeHR);
		self.faceAsset.addChild(cheekL);
		self.faceAsset.addChild(cheekR);
		self.faceAsset.addChild(smile);
		self.faceAsset.addChild(smileHL);
		self.addChild(self.faceAsset);
	};
	self.setColor(0);
	// Animate merge
	self.animateMerge = function (_onFinish) {
		tween(self, {
			scaleX: 1.3,
			scaleY: 1.3
		}, {
			duration: 120,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 120,
					easing: tween.easeIn,
					onFinish: _onFinish
				});
			}
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222233
});

/**** 
* Game Code
****/ 
// Sound for merge
// Merged block (final color)
// We'll use 5 colors: red, green, blue, yellow, purple
// Define block shapes for each color and merged color
// --- Game Constants ---
var GRID_COLS = 6;
var GRID_ROWS = 7;
var CELL_SIZE = 200; // px
var GRID_OFFSET_X = Math.floor((2048 - GRID_COLS * CELL_SIZE) / 2);
var GRID_OFFSET_Y = 350;
var COLORS = [0, 1, 2, 3, 4]; // 0=red, 1=green, 2=blue, 3=yellow, 4=purple
var COLOR_NAMES = ['red', 'green', 'blue', 'yellow', 'purple', 'white'];
var MAX_COLOR_INDEX = 5; // 0-4 normal, 5=white (final, can't merge further)
var BLOCK_DROP_Y = 2200; // y position for blocks that fall off
// --- Game State ---
var grid = []; // 2D array [col][row] of Block or null
for (var c = 0; c < GRID_COLS; c++) {
	grid[c] = [];
	for (var r = 0; r < GRID_ROWS; r++) {
		grid[c][r] = null;
	}
}
var draggingBlock = null;
var dragOffsetX = 0;
var dragOffsetY = 0;
var nextBlocks = []; // Array of next blocks to place
var score = 0;
var scoreTxt = null;
var isProcessing = false; // Prevent input during merges
// --- GUI Elements ---
scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Draw Happy Skybox Background Gradient ---
var skybox = LK.getAsset('block_blue', {
	width: 2048,
	height: 2732,
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	alpha: 1
});
game.addChild(skybox);
// Add a white "sun" circle for extra cuteness
var sun = LK.getAsset('block_white', {
	width: 420,
	height: 420,
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 180,
	alpha: 0.18
});
game.addChild(sun);
// Add some "clouds" using white blocks with low alpha
for (var i = 0; i < 4; i++) {
	var cloud = LK.getAsset('block_white', {
		width: 320 + Math.random() * 120,
		height: 90 + Math.random() * 40,
		anchorX: 0.5,
		anchorY: 0.5,
		x: 300 + i * 420 + Math.random() * 80,
		y: 120 + Math.random() * 60,
		alpha: 0.10 + Math.random() * 0.08
	});
	game.addChild(cloud);
}
// --- Draw Grid Background --- 
for (var c = 0; c < GRID_COLS; c++) {
	for (var r = 0; r < GRID_ROWS; r++) {
		var cell = LK.getAsset('block_white', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: GRID_OFFSET_X + c * CELL_SIZE + CELL_SIZE / 2,
			y: GRID_OFFSET_Y + r * CELL_SIZE + CELL_SIZE / 2,
			alpha: 0.08
		});
		game.addChild(cell);
	}
}
// --- Helper Functions ---
// Get grid cell from x,y (game coordinates)
function getGridCellFromPos(x, y) {
	var gx = Math.floor((x - GRID_OFFSET_X) / CELL_SIZE);
	var gy = Math.floor((y - GRID_OFFSET_Y) / CELL_SIZE);
	if (gx < 0 || gx >= GRID_COLS || gy < 0 || gy >= GRID_ROWS) return null;
	return {
		col: gx,
		row: gy
	};
}
// Get position (x,y) for grid cell
function getPosForCell(col, row) {
	return {
		x: GRID_OFFSET_X + col * CELL_SIZE + CELL_SIZE / 2,
		y: GRID_OFFSET_Y + row * CELL_SIZE + CELL_SIZE / 2
	};
}
// Generate a random color index (0-4)
function randomColorIndex() {
	return COLORS[Math.floor(Math.random() * COLORS.length)];
}
// Create a new block for the "next" area
function createNextBlock(idx) {
	var block = new Block();
	block.setColor(idx);
	block.x = 2048 / 2 + (nextBlocks.length - 1) * 220;
	block.y = 220;
	block.scaleX = block.scaleY = 1;
	block.isOnGrid = false;
	block.gridX = -1;
	block.gridY = -1;
	game.addChild(block);
	return block;
}
// Fill nextBlocks to always have 3 blocks
function refillNextBlocks() {
	while (nextBlocks.length < 3) {
		var idx = randomColorIndex();
		var block = createNextBlock(idx);
		nextBlocks.push(block);
	}
	// Position them nicely
	for (var i = 0; i < nextBlocks.length; i++) {
		var bx = 2048 / 2 + (i - 1) * 220;
		tween(nextBlocks[i], {
			x: bx,
			y: 220
		}, {
			duration: 180,
			easing: tween.easeInOut
		});
	}
}
// Remove a block from nextBlocks and shift others
function popNextBlock(block) {
	var idx = nextBlocks.indexOf(block);
	if (idx >= 0) {
		nextBlocks.splice(idx, 1);
	}
	refillNextBlocks();
}
// Place block on grid
function placeBlockOnGrid(block, col, row) {
	block.isOnGrid = true;
	block.gridX = col;
	block.gridY = row;
	grid[col][row] = block;
	var pos = getPosForCell(col, row);
	tween(block, {
		x: pos.x,
		y: pos.y,
		scaleX: 1,
		scaleY: 1
	}, {
		duration: 120,
		easing: tween.easeOut
	});
}
// Remove block from grid
function removeBlockFromGrid(col, row) {
	var block = grid[col][row];
	if (block) {
		grid[col][row] = null;
	}
}
// Find all connected blocks of the same color (DFS)
function findConnectedBlocks(col, row, colorIndex, visited) {
	if (col < 0 || col >= GRID_COLS || row < 0 || row >= GRID_ROWS) return [];
	if (visited[col + "," + row]) return [];
	var block = grid[col][row];
	if (!block || block.colorIndex !== colorIndex) return [];
	visited[col + "," + row] = true;
	var result = [{
		col: col,
		row: row,
		block: block
	}];
	// 4 directions
	var dirs = [[1, 0], [-1, 0], [0, 1], [0, -1]];
	for (var i = 0; i < dirs.length; i++) {
		var nc = col + dirs[i][0];
		var nr = row + dirs[i][1];
		result = result.concat(findConnectedBlocks(nc, nr, colorIndex, visited));
	}
	return result;
}
// Check if any moves are possible (empty cell exists)
function hasMoves() {
	for (var c = 0; c < GRID_COLS; c++) {
		for (var r = 0; r < GRID_ROWS; r++) {
			if (!grid[c][r]) return true;
		}
	}
	return false;
}
// --- Game Logic ---
// Handle block drop onto grid
function tryPlaceBlock(block, x, y) {
	var cell = getGridCellFromPos(x, y);
	if (!cell) return false;
	var col = cell.col,
		row = cell.row;
	if (grid[col][row]) return false; // occupied
	// Place block
	placeBlockOnGrid(block, col, row);
	popNextBlock(block);
	// After placement, check for merges
	processMerges(col, row, function () {
		// After all merges and cascades, check for game over
		if (!hasMoves()) {
			LK.showGameOver();
		}
	});
	return true;
}
// Process merges and cascades starting from (col,row)
function processMerges(col, row, onFinish) {
	if (isProcessing) return;
	isProcessing = true;
	var block = grid[col][row];
	if (!block) {
		isProcessing = false;
		if (onFinish) onFinish();
		return;
	}
	var colorIdx = block.colorIndex;
	if (colorIdx >= MAX_COLOR_INDEX) {
		isProcessing = false;
		if (onFinish) onFinish();
		return;
	}
	// Find all connected blocks of same color
	var connected = findConnectedBlocks(col, row, colorIdx, {});
	if (connected.length >= 3) {
		// Play happy merge sound only on actual merge and upgrade
		LK.getSound('merge').play();
		// Merge!
		for (var i = 0; i < connected.length; i++) {
			var b = connected[i].block;
			if (b !== block) {
				// Animate and remove
				(function (bref) {
					tween(bref, {
						scaleX: 0,
						scaleY: 0,
						alpha: 0
					}, {
						duration: 120,
						easing: tween.easeIn,
						onFinish: function onFinish() {
							bref.destroy();
						}
					});
				})(b);
				removeBlockFromGrid(b.gridX, b.gridY);
			}
		}
		// Upgrade block color
		var newColor = colorIdx + 1;
		if (newColor > MAX_COLOR_INDEX) newColor = MAX_COLOR_INDEX;
		block.setColor(newColor);
		block.animateMerge(function () {
			// After animation, check for further merges (cascade)
			// We need to check if the upgraded block can merge again
			LK.setTimeout(function () {
				// Find new connected blocks after upgrade
				var newConnected = findConnectedBlocks(col, row, block.colorIndex, {});
				if (newConnected.length >= 3) {
					// Chain reaction: process again
					processMerges(col, row, onFinish);
				} else {
					// No more merges, finish
					isProcessing = false;
					if (onFinish) onFinish();
				}
			}, 180);
		});
		// Update score
		var points = 10 * connected.length * (colorIdx + 1);
		score += points;
		scoreTxt.setText(score);
	} else {
		isProcessing = false;
		if (onFinish) onFinish();
	}
}
// --- Input Handling ---
// Only allow dragging from nextBlocks
game.down = function (x, y, obj) {
	if (isProcessing) return;
	for (var i = 0; i < nextBlocks.length; i++) {
		var block = nextBlocks[i];
		// Check if touch is inside block
		var dx = x - block.x;
		var dy = y - block.y;
		if (Math.abs(dx) < 90 && Math.abs(dy) < 90) {
			draggingBlock = block;
			dragOffsetX = dx;
			dragOffsetY = dy;
			// Play a sound when picking up a block
			LK.getSound('merge').play();
			// Bring to front
			game.addChild(block);
			tween(block, {
				scaleX: 1.15,
				scaleY: 1.15
			}, {
				duration: 80,
				easing: tween.easeOut
			});
			break;
		}
	}
};
game.move = function (x, y, obj) {
	if (!draggingBlock) return;
	draggingBlock.x = x - dragOffsetX;
	draggingBlock.y = y - dragOffsetY;
};
game.up = function (x, y, obj) {
	if (!draggingBlock) return;
	// Try to place on grid
	var placed = tryPlaceBlock(draggingBlock, draggingBlock.x, draggingBlock.y);
	if (!placed) {
		// Snap back to next area
		var idx = nextBlocks.indexOf(draggingBlock);
		var bx = 2048 / 2 + (idx - 1) * 220;
		tween(draggingBlock, {
			x: bx,
			y: 220,
			scaleX: 1,
			scaleY: 1
		}, {
			duration: 120,
			easing: tween.easeInOut
		});
	} else {
		// Play a sound when block is placed on the grid
		LK.getSound('merge').play();
		// Block is now on grid, don't need to do anything
	}
	draggingBlock = null;
};
// --- Game Update Loop ---
game.update = function () {
	// Animate blocks falling off (if any)
	for (var c = 0; c < GRID_COLS; c++) {
		for (var r = 0; r < GRID_ROWS; r++) {
			var block = grid[c][r];
			if (block && block.y > BLOCK_DROP_Y) {
				block.destroy();
				grid[c][r] = null;
			}
		}
	}
};
// --- Game Start ---
score = 0;
scoreTxt.setText(score);
refillNextBlocks();
// --- Game Over / Reset handled by LK engine ---