app-2.js

var scores, roundScore, activePlayer, gamePlaying, checkScore;
var previousDice;
var inputScoreNumber;

init();

// Hide the dice at the Start of the Game
document.querySelector('.dice-1').style.display = 'none';
document.querySelector('.dice-2').style.display = 'none';

// Add event listener to 'Roll Dice' Button : Roll Dice Button
document.querySelector('.btn-roll').addEventListener('click', function () {
    if (gamePlaying) {
        // Roll the Dice to Get a Random Number 
        var diceOne = Math.floor(Math.random() * 6) + 1;
        console.log('Current Value of Dice One = ' + diceOne);

        var diceTwo = Math.floor(Math.random() * 6) + 1;
        console.log('Current Value of Dice Two = ' + diceTwo);

        //console.log('Current Dice Value = ' + dice);

        // Display the Dice Image and the Result
        var diceObjectOne = document.querySelector('.dice-1');
        diceObjectOne.style.display = 'block';
        diceObjectOne.src = 'dice-' + diceOne + '.png';

        var diceObjectTwo = document.querySelector('.dice-2');
        diceObjectTwo.style.display = 'block';
        diceObjectTwo.src = 'dice-' + diceTwo + '.png';

        // Update the round Score (if the rolled number is not 1)
        if (diceOne === 6 && diceTwo === 6) {
            scores[activePlayer] = 0;
            document.getElementById('score-' + activePlayer).textContent = scores[activePlayer];
            switctPlayers();
        } else if (diceOne > 1 && diceTwo > 1) {
            // Add the Scores 
            roundScore = roundScore + diceOne + diceTwo;
            document.querySelector('#current-' + activePlayer).textContent = roundScore;
        } else {

            // The Other Player Gets the Chance and your round Scroe is Set to Zero. Next Player
            switctPlayers();
        }

        //previousDice = dice;
        //console.log('Previous Dice Value = ' + previousDice);
    }

});

// New Game Button
document.querySelector('.btn-new').addEventListener('click', init);

// Hold-Button
document.querySelector('.btn-hold').addEventListener('click', function () {
    if (gamePlaying) {

        // Add the Current Score to the Global Score.
        scores[activePlayer] += roundScore;

        // Update the UI With the Global Score. Next Player
        document.getElementById('score-' + activePlayer).textContent = scores[activePlayer];

        // Test
        //console.log('Inside Hold ' + inputScoreNumber);

        if (inputScoreNumber === undefined) {
            checkScore = 50;
        } else {
            checkScore = inputScoreNumber;
        }

        // Check If a Player Has Won
        if (scores[activePlayer] >= checkScore) {
            document.querySelector('#name-' + activePlayer).textContent = 'Winner!!!';
            document.querySelector('.dice-1').style.display = 'none';
            document.querySelector('.dice-2').style.display = 'none';
            document.querySelector('.player-' + activePlayer + '-panel').classList.add('winner');
            document.querySelector('.player-' + activePlayer + '-panel').classList.remove('active');
            gamePlaying = false;
        } else {
            switctPlayers();
        }
    }
});


// Next Player Re-Usable Function

function switctPlayers() {
    // Hand over the dice to the other player
    activePlayer === 0 ? activePlayer = 1 : activePlayer = 0;
    roundScore = 0;

    // Display the Reset roundScrore to zero
    document.getElementById('current-0').textContent = '0';
    document.getElementById('current-1').textContent = '0';

    // Toogle the style for the Current Player
    document.querySelector('.player-0-panel').classList.toggle('active');
    document.querySelector('.player-1-panel').classList.toggle('active');

    document.querySelector('.dice-1').style.display = 'none';
    document.querySelector('.dice-2').style.display = 'none';
}

// Initilize Function

function init() {
    scores = [0, 0];
    roundScore = 0;
    activePlayer = 0;
    gamePlaying = true;
    // Initilize all the Values to zero at the Start of the game.
    document.getElementById('score-0').textContent = '0';
    document.getElementById('score-1').textContent = '0';
    document.getElementById('current-0').textContent = '0';
    document.getElementById('current-1').textContent = '0';

    document.getElementById('name-0').textContent = 'Player 1';
    document.getElementById('name-1').textContent = 'Player 2';

    document.querySelector('.player-0-panel').classList.remove('winner');
    document.querySelector('.player-1-panel').classList.remove('winner');
    document.querySelector('.player-0-panel').classList.remove('active');
    document.querySelector('.player-1-panel').classList.remove('active');

    document.querySelector('.player-0-panel').classList.add('active');

    // Get the Final Score from the user
    document.querySelector('.btn-outline-success').addEventListener('click', function () {
        inputScoreNumber = document.querySelector('.final-score').value;
        console.log(inputScoreNumber);
    });
}