/**** 
* Classes
****/ 
// Class for the game board
var Board = Container.expand(function () {
	var self = Container.call(this);
	self.grid = [];
	self.rows = 8;
	self.cols = 8;
	self.spacing = 10;
	var mesureGem = new Gem();
	self.gemSize = mesureGem.width + self.spacing;
	self.init = function () {
		for (var row = 0; row < self.rows; row++) {
			self.grid[row] = [];
			for (var col = 0; col < self.cols; col++) {
				var gem = new Gem();
				gem.x = gem.targetX = col * self.gemSize;
				gem.y = gem.targetY = row * self.gemSize;
				gem.col = col;
				gem.row = row;
				self.grid[row][col] = gem;
				self.addChild(gem);
			}
		}
	};
	// Method to swap two gems
	self.swapGems = function (gem1, gem2) {
		var temp = self.grid[gem1.row][gem1.col];
		self.grid[gem1.row][gem1.col] = self.grid[gem2.row][gem2.col];
		self.grid[gem2.row][gem2.col] = temp;
		var tempX = gem1.targetX;
		var tempY = gem1.targetY;
		var tempRow = gem1.row;
		var tempCol = gem1.col;
		gem1.targetX = gem2.targetX;
		gem1.targetY = gem2.targetY;
		gem1.row = gem2.row;
		gem1.col = gem2.col;
		gem2.targetX = tempX;
		gem2.targetY = tempY;
		gem2.row = tempRow;
		gem2.col = tempCol;
		gem1.atRest = gem2.atRest = false;
	};
	self.findMatches = function () {
		var matches = [];
		for (var row = 0; row < self.rows; row++) {
			for (var col = 0; col < self.cols; col++) {
				var match = self.checkMatch(row, col);
				if (match) {
					matches = matches.concat(match);
				}
			}
		}
		return matches;
	};
	self.resolve = function () {
		var matches = board.findMatches();
		var offsetYs = [];
		for (var a = 0; a < self.cols; a++) {
			offsetYs[a] = 0;
		}
		// Loop over all the gems on the board
		for (var row = 0; row < board.rows; row++) {
			for (var col = 0; col < board.cols; col++) {
				var gem = board.grid[row][col];
				// Check if the gem is part of a match
				if (matches.some(function (match) {
					return match.includes(gem);
				})) {
					// If it is, set its alpha to half opacity
					self.grid[gem.row][gem.col] = undefined;
					gem.destroy();
					offsetYs[gem.col]++;
				} else {
					// If it's not, set its alpha to full opacity
					//gem.alpha = 1;
				}
			}
		}
		//Move down all gems into available spaces here.
		//Implement that the below code is repeated until no changes occur
		var changes;
		do {
			changes = false;
			for (var row = self.rows - 1; row >= 0; row--) {
				for (var col = 0; col < self.cols; col++) {
					if (self.grid[row][col] === undefined) {
						for (var aboveRow = row - 1; aboveRow >= 0; aboveRow--) {
							if (self.grid[aboveRow][col] !== undefined) {
								self.grid[row][col] = self.grid[aboveRow][col];
								self.grid[aboveRow][col] = undefined;
								self.grid[row][col].row = row;
								self.grid[row][col].setTargetPosition();
								changes = true;
								break;
							}
						}
					}
				}
			}
		} while (changes);
		//Code to update to make sure gems are inserted correctly.
		for (var row = 0; row < self.rows; row++) {
			for (var col = 0; col < self.cols; col++) {
				if (self.grid[row][col] === undefined) {
					var newGem = new Gem();
					newGem.atRest = false;
					newGem.x = col * self.gemSize;
					newGem.y = -offsetYs[col] * self.gemSize;
					offsetYs[col]--;
					newGem.col = col;
					newGem.row = row;
					self.grid[row][col] = newGem;
					self.addChild(newGem);
					newGem.setTargetPosition();
				}
			}
		}
	};
	self.checkMatch = function (row, col) {
		var gem = self.grid[row][col];
		// Ignore gems that are not resting on the board
		if (!gem.atRest) {
			return null;
		}
		var horizontalMatch = [gem];
		var verticalMatch = [gem];
		// Check for horizontal match
		for (var i = col + 1; i < self.cols; i++) {
			if (self.grid[row][i].type === gem.type && self.grid[row][i].atRest) {
				horizontalMatch.push(self.grid[row][i]);
			} else {
				break;
			}
		}
		// Check for vertical match
		for (var i = row + 1; i < self.rows; i++) {
			if (self.grid[i][col].type === gem.type && self.grid[i][col].atRest) {
				verticalMatch.push(self.grid[i][col]);
			} else {
				break;
			}
		}
		// Return match if 3 or more gems of the same type are in a row
		if (horizontalMatch.length >= 3 || verticalMatch.length >= 3) {
			var toReturn = [];
			if (horizontalMatch.length >= 3) {
				toReturn.push(horizontalMatch);
			}
			if (verticalMatch.length >= 3) {
				toReturn.push(verticalMatch);
			}
			return toReturn;
		} else {
			return null;
		}
	};
});
//<Assets used in the game will automatically appear here>
// Class for a single gem
var Gem = Container.expand(function () {
	var self = Container.call(this);
	self.type = Math.floor(Math.random() * 5); // Random type for the gem
	self.row = 0;
	self.col = 0;
	var gemGraphics;
	switch (self.type) {
		case 0:
			gemGraphics = self.attachAsset('gem1', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 1:
			gemGraphics = self.attachAsset('gem2', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 2:
			gemGraphics = self.attachAsset('gem3', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 3:
			gemGraphics = self.attachAsset('gem4', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
		case 4:
			gemGraphics = self.attachAsset('gem5', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			break;
	}
	self.targetX = 0;
	self.targetY = 0;
	self.update = function () {
		// Update logic for the gem if needed
	};
	self.down = function (x, y, obj) {
		// Logic for selecting the gem
		game.selectGem(self, x, y);
	};
	self.atRest = false;
	self.velocityX = 0;
	self.velocityY = 0;
	self.update = function () {
		if (currentDragNode != self) {
			var orgXoffset = self.x - self.targetX;
			var orgYoffset = self.y - self.targetY;
			console.log(-orgXoffset / Math.abs(orgXoffset));
			self.velocityX += -orgXoffset / Math.abs(orgXoffset);
			self.velocityY += -orgYoffset / Math.abs(orgYoffset);
			self.x += self.velocityX;
			self.y += self.velocityY;
			var newYoffset = self.y - self.targetY;
			var newXoffset = self.x - self.targetX;
			if (orgYoffset < 0 && newYoffset > 0 || orgYoffset > 0 && newYoffset < 0) {
				self.velocityY = 0;
				self.y = self.targetY;
			}
			if (orgXoffset < 0 && newXoffset > 0 || orgXoffset > 0 && newXoffset < 0) {
				self.velocityX = 0;
				self.x = self.targetX;
			}
		}
		self.atRest = Math.abs(self.x - self.targetX) < 1 && Math.abs(self.y - self.targetY) < 1;
	};
	self.setTargetPosition = function () {
		self.targetX = self.col * board.gemSize;
		self.targetY = self.row * board.gemSize;
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background 
});

/**** 
* Game Code
****/ 
var selectedGem = null;
var board = new Board();
board.x = (2048 - board.cols * board.gemSize + board.gemSize + board.spacing) / 2;
board.y = (2732 - board.rows * board.gemSize + board.gemSize + board.spacing) / 2;
board.init();
game.addChild(board);
var currentDragNode = undefined;
var currentDragNodeX = 0;
var currentDragNodeY = 0;
game.selectGem = function (gem, offsetX, offsetY) {
	currentDragNode = gem;
	currentDragNodeX = offsetX;
	currentDragNodeY = offsetY;
	board.addChild(gem);
};
game.move = function (x, y) {
	if (currentDragNode) {
		currentDragNode.x = x - board.x - currentDragNodeX;
		currentDragNode.y = y - board.y - currentDragNodeY;
		var offsetX = currentDragNode.targetX - currentDragNode.x;
		var offsetY = currentDragNode.targetY - currentDragNode.y;
		if (Math.abs(offsetX) > 100) {
			console.log("Should swap X");
			if (offsetX > 0) {
				if (currentDragNode.col > 0) {
					var leftGem = board.grid[currentDragNode.row][currentDragNode.col - 1];
					board.swapGems(currentDragNode, leftGem);
					currentDragNode = undefined;
					return;
				}
			} else {
				if (currentDragNode.col < board.cols - 1) {
					var rightGem = board.grid[currentDragNode.row][currentDragNode.col + 1];
					board.swapGems(currentDragNode, rightGem);
					currentDragNode = undefined;
					return;
				}
			}
		}
		if (Math.abs(offsetY) > 100) {
			console.log("Should swap Y");
			if (offsetY > 0) {
				if (currentDragNode.row > 0) {
					var upGem = board.grid[currentDragNode.row - 1][currentDragNode.col];
					board.swapGems(currentDragNode, upGem);
					currentDragNode = undefined;
					return;
				}
			} else {
				if (currentDragNode.row < board.rows - 1) {
					var downGem = board.grid[currentDragNode.row + 1][currentDragNode.col];
					board.swapGems(currentDragNode, downGem);
					currentDragNode = undefined;
					return;
				}
			}
		}
	}
};
game.up = function () {
	currentDragNode = undefined;
};
//Debug method
game.update = function () {
	board.resolve();
};