class Bowling {
	constructor() {
    	this.scoreBoard = new Array(22);
    	this.STRIKE = 10;
    	this.SPARE = 10;
  	}

	startNewRound() {
  		this.scoreBoard.fill(0);
  		this.currentRoll = 0;
  		this.currentScore = 0;
  	}

  	printScoreBoard() {
  		//Row 1: Headers
  		for (var i = 1; i <= 10; i++) {
  			process.stdout.write(i + "\t");
  		}
  		console.log("Extra");

  		//Row 2: Round scores
  		for (var i = 0; i < this.scoreBoard.length; i=i+2) {
  			if (this.scoreBoard[i] == this.STRIKE) {
  				process.stdout.write("X\t");
  			} else if(this.scoreBoard[i] + this.scoreBoard[i+1] == this.SPARE) {
  				process.stdout.write(this.scoreBoard[i].toString() + " /\t");
  			} else {
  				process.stdout.write(this.scoreBoard[i].toString() + " " + this.scoreBoard[i+1].toString() + "\t");
  			}
  		}
  		console.log("");

  		//Row 3: Accumulated scores
  		for (var i = 0; i < 20; i=i+2) {
  			if (this.scoreBoard[i] == this.STRIKE) {
  				this.currentScore = this.currentScore + this.STRIKE + this.scoreBoard[i+2] + this.scoreBoard[i+3];
  			} else if(this.scoreBoard[i] + this.scoreBoard[i+1] == this.SPARE) {
  				this.currentScore = this.currentScore + this.SPARE + this.scoreBoard[i+2];
  			} else {
  				this.currentScore = this.currentScore + this.scoreBoard[i] + this.scoreBoard[i+1];
  			}
  			process.stdout.write(this.currentScore + "\t")
  		}
  		console.log("")
  	}

  	roll() {
  		var isEvenRoll = this.currentRoll % 2 == 0 ? true : false;
  		var availablePins = isEvenRoll ? 10 : 10 - this.scoreBoard[this.currentRoll-1];
  		var pinsDown = 0;
  		var rand = Math.random();

  		if (availablePins != 0) {
			pinsDown = (rand != 0) ? Math.floor((rand*availablePins) + 1) : 0;
  		}
  		this.scoreBoard[this.currentRoll++] = pinsDown;
  	}

  	canRollAgain() {
	  	if (this.currentRoll < 20) {
	  		return true;
	  	} else if ((this.currentRoll == 20) && (this.scoreBoard[this.currentRoll-2] == this.STRIKE)) {
	  		return true;
	  	} else if ((this.currentRoll == 21) && (this.scoreBoard[this.currentRoll-3] == this.STRIKE)) {
	  		return true;
	  	} else if (this.currentRoll == 20 && (this.scoreBoard[this.currentRoll-1] + this.scoreBoard[this.currentRoll-2] == this.SPARE)) {
	  		return true;
	  	} else {
	  		return false;
	  	}
  	}
}

var bowling = new Bowling();
bowling.startNewRound();
while (bowling.canRollAgain()) {
	bowling.roll();
}

bowling.printScoreBoard();