Pong Score Tracker

pong.js

var pong = {};

// Flags
// Player 0, Player 1 scores :)
pong.score = [0, 0];
// We'll use this flag to set first serve
pong.gameStart = false;
pong.currentlyServing = 0;

// Scoring functions
pong.increaseScore = function(player) {
    // If game hasn't started, first button press sets serve
    if (pong.gameStart === false) {
        pong.currentlyServing = player;
        pong.score = [0,0];
        pong.gameStart = true;
        console.log('Starting game and setting serve to player ' + player);
    } else {
        pong.score[player] = pong.score[player] + 1;
        console.log('point for player ' + player);
    }

    // Update current server upon every score
    pong.currentlyServing = pong.calculateCurrentServer(pong.score, pong.currentlyServing);

    // Let the game continue if we're in deuce
    if (pong.scoreIsDeuce(pong.score)) {
        console.log('Deuces!');
        if (Math.abs(pong.score[0] - pong.score[1]) === 2) {
            pong.gameStart = false;
            pong.announceGameWinner(pong.score);
            return false;
        }
    } else {
        // If not in deuce, let's end the game on 11
        if (pong.score[0] === 11 || pong.score[1] === 11) {
            pong.gameStart = false;
            pong.announceGameWinner(pong.score);
            return false;
        }
    }

    var data = {
        score: pong.score,
        serving: pong.currentlyServing
    }

    console.log('score: ' + pong.score[0] + ' - ' + pong.score[1]);
    console.log('serving: Player ' + pong.currentlyServing);

    // return data;
}

pong.scoreIsDeuce = function(score) {
    if (score[0] + score[1] >= 21) return true;
}

pong.calculateGameWinner = function(score) {
    return score.indexOf(Math.max.apply(Math, score));
}

pong.calculateGameLoser = function(score) {
    return score.indexOf(Math.min.apply(Math, score));
}

pong.announceGameWinner = function(score) {
    console.log('game over! Player ' + pong.calculateGameWinner(pong.score) + ' won ' + pong.score[pong.calculateGameWinner(pong.score)] + ' to ' + pong.score[pong.calculateGameLoser(pong.score)] + '.');
}

pong.calculateCurrentServer = function(score, currentlyServing) {
    // Otherwise, we have to flip first server to trick this
    if (score[0] + score[1] === 0) {
        console.log('starting game, set current server');
        return currentlyServing;
    }

    // Gotta change servers every point on deuce
    if (pong.scoreIsDeuce(score)) {
        if (currentlyServing === 0) {
            return 1;
        } else {
            return 0;
        }
    } else {
        // Alternate serve every 2 points
        if ((score[0] + score[1]) % 2 === 0) {
            console.log('serve change detected!');
            if (currentlyServing === 0) {
                return 1;
            } else {
                return 0;
            }
        } else {
            return currentlyServing;
        }
    }
}