app.js

/*
 GAME RULES:

 - The game has 2 players, playing in rounds
 - In each turn, a player rolls a dice as many times as he whishes. Each result get added to his ROUND score
 - BUT, if the player rolls a 1, all his ROUND score gets lost. After that, it's the next player's turn
 - The player can choose to 'Hold', which means that his ROUND score gets added to his GLBAL score. After that, it's the next player's turn
 - The first player to reach 100 points on GLOBAL score wins the game

 */

var scores, roundScore, activePlayer, gamePlaying;

// initialize the game
initial();

document.querySelector('.btn-roll').addEventListener('click', function () {
    if (gamePlaying) {
        //produce a random number
        var dice = Math.floor(Math.random() * 6) + 1;

        //picture shows result
        var diceDOM = document.querySelector('.dice');
        diceDOM.style.display = 'block';
        diceDOM.src = 'dice-' + dice + '.png';

        //add number to round score
        if (dice !== 1) {
            roundScore += dice;
            document.getElementById('current-' + activePlayer).textContent = roundScore;
        } else {
            // switch player
            switchPlayer();
        }
    }

});

document.querySelector('.btn-hold').addEventListener('click', function () {
    if (gamePlaying) {
        //add CURRENT score to GLOBAL score
        scores[activePlayer] += roundScore;

        //update the UI
        document.getElementById('score-' + activePlayer).textContent = scores[activePlayer];

        //check if the activePlayer won.
        if (scores[activePlayer] >= 20) {
            document.querySelector('#name-' + activePlayer).textContent = 'Winner';
            document.querySelector('.player-' + activePlayer + '-panel').classList.add('winner');
            document.querySelector('.player-' + activePlayer + '-panel').classList.remove('active');
            document.querySelector('.dice').style.display = 'none';
            gamePlaying = false;

        } else {
            //switch player
            switchPlayer();
        }
    }
});

document.querySelector('.btn-new').addEventListener('click', initial);


/**********************/
/* functions */
/**********************/

function switchPlayer() {
    roundScore = 0;
    activePlayer !== 0 ? activePlayer = 0 : activePlayer = 1;
    document.getElementById('current-0').textContent = '0';
    document.getElementById('current-1').textContent = '0';
    document.querySelector('.player-0-panel').classList.toggle('active');
    document.querySelector('.player-1-panel').classList.toggle('active');
    document.querySelector('.dice').style.display = 'none';
}

// document.querySelector('#current-' + activePlayer).innerHTML = '<em>' + dice + '</em>';


function initial() {
    scores = [0, 0];
    roundScore = 0;
    activePlayer = 0;
    gamePlaying = true;

    document.querySelector('.dice').style.display = 'none';
    document.getElementById('current-0').textContent = '0';
    document.getElementById('current-1').textContent = '0';
    document.getElementById('score-0').textContent = '0';
    document.getElementById('score-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');
}