Emanuele Feronato

var game;
var tileSize = 50;
var fieldSize = 6;
var tileTypes = 6
var movingRow;
var movingCol;
var tileArray = [];
var startX;
var startY;
var distX;
var distY;
var dragDirection = "";
var tempTile;

window.onload = function() {	        
	game = new Phaser.Game(300, 300);
	game.state.add("PlayGame", playGame)
	game.state.start("PlayGame");
}

var playGame = function(game){}
playGame.prototype = {
	preload: function(){
          game.load.spritesheet("tiles", "tiles.png", tileSize, tileSize);
          game.scale.scaleMode = Phaser.ScaleManager.SHOW_ALL;
     	game.scale.setScreenSize = true;
          game.scale.pageAlignHorizontally = true;
          game.scale.pageAlignVertically = true;
	},
	create: function(){
          for(var i = 0; i < fieldSize; i++){
			tileArray[i] = [];
			for(j = 0; j < fieldSize; j++){
				var randomTile = Math.floor(Math.random() * tileTypes);
				theTile = game.add.sprite(j * tileSize, i * tileSize, "tiles");
				theTile.frame = randomTile;
				theTile.value = randomTile;
				tileArray[i][j] = theTile;	
			}
		}
		tempTile = game.add.sprite(0, 0, "tiles");
		tempTile.visible = false;
		game.input.onDown.add(pickTile, this);
	}
}

function pickTile(){
	startX = game.input.worldX;
	startY = game.input.worldY;
	movingRow = Math.floor(startY / tileSize);
	movingCol = Math.floor(startX / tileSize);
	dragging = true;
	game.input.onDown.remove(pickTile, this);
	game.input.onUp.add(releaseTile, this);
     game.input.addMoveCallback(moveTile, this);
}

function moveTile(){
	distX = game.input.worldX - startX;
	distY = game.input.worldY - startY;
     switch(dragDirection){
		case "":
			var dist = distX * distX + distY * distY;
			if(dist > 25) {
				var dragAngle = Math.abs(Math.atan2(distY, distX));
				if((dragAngle > Math.PI / 4 && dragAngle < 3 * Math.PI / 4)) {
   					dragDirection = "vertical";
				}
				else {
   					dragDirection = "horizontal";
				}
			}
		break;
		case "horizontal":
			tempTile.visible = false;
			tempTile.y = movingRow * tileSize;
			var deltaX = (Math.floor(distX / tileSize) % fieldSize);
			if (deltaX >= 0) {									
				tempTile.frame = tileArray[movingRow][fieldSize - 1 - deltaX].value;
			}
			else{
				deltaX=deltaX * -1 -1;
				tempTile.frame = tileArray[movingRow][deltaX].value;		
			}
			for(var i = 0; i < fieldSize; i++){
				tileArray[movingRow][i].x = (i * tileSize + distX) % (tileSize * fieldSize);
				if (tileArray[movingRow][i].x < 0) {
   					tileArray[movingRow][i].x += tileSize * fieldSize;
				}
                    if(distX % tileSize > 0){
                    	tempTile.visible = true;
                         tempTile.x = distX % tileSize - tileSize;
                    }
                    if(distX % tileSize < 0){
                    	tempTile.visible = true;
                         tempTile.x = distX % tileSize;
                    } 
			}
		break;
		case "vertical":
			tempTile.visible = false;
			tempTile.x = movingCol * tileSize;
			var deltaY = (Math.floor(distY / tileSize) % fieldSize);
			if (deltaY >= 0) {									
				tempTile.frame = tileArray[fieldSize - 1 - deltaY][movingCol].value;
			}
			else{
				deltaY = deltaY * -1 -1;
				tempTile.frame = tileArray[deltaY][movingCol].value;		
			}
			for(var i = 0; i < fieldSize; i++){
				tileArray[i][movingCol].y = (i * tileSize + distY) % (tileSize * fieldSize);
				if (tileArray[i][movingCol].y < 0) {
   					tileArray[i][movingCol].y += tileSize * fieldSize;
				}
                    if(distY % tileSize > 0){
                    	tempTile.visible = true;
                         tempTile.y = distY % tileSize - tileSize;
                    }
                    if(distY % tileSize < 0){
                    	tempTile.visible = true;
                         tempTile.y = distY % tileSize;
                    }   
			}
		break;
	} 
}
	
	
function releaseTile(){
	switch(dragDirection){
		case "horizontal":
			var shiftAmount = Math.floor(distX / (tileSize / 2));
			shiftAmount = Math.ceil(shiftAmount / 2) % fieldSize;
			var tempArray = [];
			if(shiftAmount > 0){
				for(var i = 0; i < fieldSize; i++){
					tempArray[(shiftAmount + i) % fieldSize] = tileArray[movingRow][i].value;
				}
			}
			else{
				shiftAmount *= -1;
				for(var i = 0; i < fieldSize; i++){
					tempArray[i] = tileArray[movingRow][(shiftAmount + i) % fieldSize].value;
				}
			}
			for(i = 0; i < fieldSize; i++){
				tileArray[movingRow][i].value = tempArray[i];
				tileArray[movingRow][i].frame = tempArray[i];
				tileArray[movingRow][i].x = i * tileSize;
			}
		break;
		case "vertical":
			var shiftAmount = Math.floor(distY / (tileSize / 2));
				shiftAmount = Math.ceil(shiftAmount / 2) % fieldSize;
				var tempArray = [];
				if(shiftAmount > 0){
					for(var i = 0; i < fieldSize; i++){
						tempArray[(shiftAmount + i) % fieldSize] = tileArray[i][movingCol].value;
					}
				}
				else{
					shiftAmount *= -1;
					for(var i = 0; i < fieldSize; i++){
						tempArray[i] = tileArray[(shiftAmount + i) % fieldSize][movingCol].value;
					}
				}
				for(var i = 0; i < fieldSize; i++){
					tileArray[i][movingCol].value = tempArray[i];
					tileArray[i][movingCol].frame = tempArray[i];
					tileArray[i][movingCol].y= i * tileSize;
			}
		break;	
	}
	dragDirection = "";
	tempTile.visible = false;
	game.input.onUp.remove(releaseTile, this);
     game.input.deleteMoveCallback(moveTile, this);  
	game.input.onDown.add(pickTile, this);
}