var isMoving = false, diskOrigin, diskDestiny, movements;
var nWrongMoves = 0;
var moves = [], totalMoves = []; //vector to save movements
var acertou=0;
var optimalSolution;
var redo = false, undo = false;
var textDict = {disk0: "stroked0",
								disk1: "stroked1",
								disk2: "stroked2",
								disk3: "stroked3",
								disk4: "stroked4",
								disk5: "stroked5",
								stroked0: "disk0",
								stroked1: "disk1",
								stroked2: "disk2",
								stroked3: "disk3",
								stroked4: "disk4",
								stroked5: "disk5"}
//To know which tower was selected
function getTower (id){
	switch(id){
		case 0:
			return towerA;
		case 1:
			return towerB;
		case 2:
			return towerC;
	}
}

function selectA (){
  if (!isMoving){
    if(towerA.length>0){
      diskOrigin = 0;
      isMoving = true;
      towerA[towerA.length-1].setTexture(textDict[towerA[towerA.length-1].texture.key]);
    }
  } else{
    if(diskOrigin!=0){
      moveFromTo(diskOrigin, 0);
    } else{
      towerA[towerA.length-1].setTexture(textDict[towerA[towerA.length-1].texture.key]);
      isMoving=false;
			nMoves.text++;
    }
  }
}

function selectB (){
  if (!isMoving){
    if(towerB.length>0){
      diskOrigin = 1;
      isMoving = true;
      towerB[towerB.length-1].setTexture(textDict[towerB[towerB.length-1].texture.key]);
    }
  } else{
    if(diskOrigin!=1){
      moveFromTo(diskOrigin, 1);
    } else{
      towerB[towerB.length-1].setTexture(textDict[towerB[towerB.length-1].texture.key]);
      isMoving=false;
			nMoves.text++;
    }
  }
}

function selectC (){
  if (!isMoving){
    if(towerC.length>0){
      diskOrigin = 2;
      isMoving = true;
      towerC[towerC.length-1].setTexture(textDict[towerC[towerC.length-1].texture.key]); //levantar o disco
    }
  } else{
    if(diskOrigin!=2){
      moveFromTo(diskOrigin, 2);
    } else{
      towerC[towerC.length-1].setTexture(textDict[towerC[towerC.length-1].texture.key]);
      isMoving=false;
			nMoves.text++;
    }
  }
}


function  moveFromTo (origin, destiny){
  var originTower = getTower(origin), destinyTower = getTower(destiny);
  var topDiskOrigin = originTower[originTower.length-1], topDiskDestiny;
	if (!undo && !redo)	{
		topDiskOrigin.setTexture(textDict[topDiskOrigin.texture.key]);
	}
  if (destinyTower.length>0){
		//movement to a tower with a disk in it
    topDiskDestiny = destinyTower[destinyTower.length-1];
    if(topDiskOrigin.displayWidth<=topDiskDestiny.displayWidth){
			topDiskOrigin.x += 435*(destiny-origin);
			topDiskOrigin.y += 28*(originTower.length-destinyTower.length-1);
			originTower.pop();
			destinyTower.push(topDiskOrigin);
			//control variables
			nMoves.text++;
			totalMoves.push(origin+"  "+destiny);
			if (!undo){
				//if it is either a redo or a new move we must add new moves to the current sequence for possible 'undos'
				if(!redo){
					//if it is a new move, we clean all possible "redos"
					moves.splice(nCurrentMoves, moves.length- nCurrentMoves);
					moves.push(origin+"  "+destiny);
				}
				nCurrentMoves++;
				undoButton.setInteractive({useHandCursor: true});
				undoButton.setTexture('undo');
				if(nCurrentMoves==moves.length){
					redoButton.disableInteractive();
					redoButton.setTexture('redoDisabled');
				}
				redo=false;
			}else{
				nCurrentMoves--;
				undo=false;
				redoButton.setInteractive({useHandCursor: true});
				redoButton.setTexture('redo');
				if(nCurrentMoves==0){
					undoButton.disableInteractive();
					undoButton.setTexture('undoDisabled');
				}
			}
    }
  }else{
		//move to a tower without a disk in it
    topDiskOrigin.x += 435*(destiny-origin);
		topDiskOrigin.y += 28*(originTower.length-destinyTower.length-1);
		originTower.pop();
		destinyTower.push(topDiskOrigin);
		//control variables
		nMoves.text++;
		totalMoves.push(origin+"  "+destiny);
		if (!undo){
			//if it is either a redo or a new move we must add new moves to the current sequence for possible 'undos'
			if(!redo){
				//if it is a new move, we clean all possible "redos" and add the new move to the list
				moves.splice(nCurrentMoves, moves.length- nCurrentMoves);
				moves.push(origin+"  "+destiny);
			}
			nCurrentMoves++;
			if(nCurrentMoves==moves.length){
				redoButton.disableInteractive();
				redoButton.setTexture('redoDisabled');
			}
			undoButton.setInteractive({useHandCursor: true});
			undoButton.setTexture('undo');
			redo=false;
		}else{
			nCurrentMoves--;
			undo=false;
			redoButton.setInteractive({useHandCursor: true});
			redoButton.setTexture('redo');
			if(nCurrentMoves==0){
				undoButton.disableInteractive();
				undoButton.setTexture('undoDisabled');
			}
		}
  }
	movements+=origin+" "+destiny+"\n"
  isMoving=false;
	if (towerC.length == diskQntity){
		gameWonMsg.text = "Você terminou de mover a torre!!! Parabéns!!"
	}else{
		gameWonMsg.text ='';
	}
}

function redoMove(){
	if (nCurrentMoves < moves.length){
		var res = moves[nCurrentMoves].split("  ");
		redo=true;
		moveFromTo(parseInt(res[0]), parseInt(res[1]));
		if(nCurrentMoves==moves.length) redoButton.setInteractive({useHandCursor: false});
	}
}

function undoMove(){
	if(nCurrentMoves>0){
		var res = moves[nCurrentMoves-1].split("  ");
		undo=true;
		moveFromTo(parseInt(res[1]), parseInt(res[0]));
		if(nCurrentMoves==0) undoButton.setInteractive({useHandCursor: false});
		redoButton.setInteractive({useHandCursor: true});
	}
}