Problem4-RollandGarros

function solve(input) {

    var playerArray = {};
    var result = [];

    for (var index in input) {
        //split and parse players and score
        var line = input[index].split(/(vs.)+/g);
        var player1 = line[0].trim();
        line = line[2].split(/(:)+/g);

        var player2 = line[0].trim();
        var score = line[2].trim().split(/\s+/g);

        //replace whitespaces between player names with a single space
        player1 = player1.replace(/\s+/g, ' ');
        player2 = player2.replace(/\s+/g, ' ');

        //set up variables for counting won and lost games, sets and matches
        var player1GamesWon = 0;
        var player2GamesWon = 0;
        var player1GamesLost = 0;
        var player2GamesLost = 0;
        var player1SetsWon = 0;
        var player2SetsWon = 0;
        var player1SetsLost = 0;
        var player2SetsLost = 0;
        var player1MatchesWon = 0;
        var player2MatchesWon = 0;
        var player1MatchesLost = 0;
        var player2MatchesLost = 0;

        //calculate the wins and losses
        for (var i in score) {
            var setScore = score[i].split('-');
            var player1Games = Number(setScore[0]);
            var player2Games = Number(setScore[1]);

            //calculate games each player has won
            player1GamesWon += player1Games;
            player2GamesWon += player2Games;

            //calculate games each player has lost
            player1GamesLost += player2Games;
            player2GamesLost += player1Games;

            //calculate won and lost sets for each player
            if (player1Games > player2Games) {
                player1SetsWon += 1;
                player2SetsLost += 1;
            } else {
                player2SetsWon += 1;
                player1SetsLost += 1;
            }
        }

        //calculate the match wins and losses
        if (player1SetsWon > player2SetsWon) {
            player1MatchesWon += 1;
            player2MatchesLost += 1;
        } else {
            player2MatchesWon += 1;
            player1MatchesLost += 1;
        }

        //create new objects for the players
        //if they don't exist
        if(!playerArray[player1]) {
            playerArray[player1] = {
                'name': player1,
                'matchesWon': 0,
                'matchesLost': 0,
                'setsWon': 0,
                'setsLost': 0,
                'gamesWon': 0,
                'gamesLost': 0
            };
        }
        if(!playerArray[player2]) {
            playerArray[player2] = {
                'name': player2,
                'matchesWon': 0,
                'matchesLost': 0,
                'setsWon': 0,
                'setsLost': 0,
                'gamesWon': 0,
                'gamesLost': 0
            };
        }

        //add the data for won and lost games, sets and matches
        //to the object of player1
        playerArray[player1].matchesWon += player1MatchesWon;
        playerArray[player1].matchesLost += player1MatchesLost;
        playerArray[player1].setsWon += player1SetsWon;
        playerArray[player1].setsLost += player1SetsLost;
        playerArray[player1].gamesWon += player1GamesWon;
        playerArray[player1].gamesLost += player1GamesLost;

        //and player2
        playerArray[player2].matchesWon += player2MatchesWon;
        playerArray[player2].matchesLost += player2MatchesLost;
        playerArray[player2].setsWon += player2SetsWon;
        playerArray[player2].setsLost += player2SetsLost;
        playerArray[player2].gamesWon += player2GamesWon;
        playerArray[player2].gamesLost += player2GamesLost;
    }

    //push the player objects in a new array
    //we will sort this array
    for (var key in playerArray) {
        result.push(playerArray[key]);
    }

    //sort function
    function compare(player1, player2) {
        //compare won matches
        if (player1.matchesWon > player2.matchesWon) {
            return -1;
        } else if (player1.matchesWon < player2.matchesWon) {
            return 1;
        //if both players have an equal number of wins
        } else if (player1.matchesWon == player2.matchesWon) {
            //compare won sets
            if (player1.setsWon > player2.setsWon) {
                return -1;
            } else if (player1.setsWon < player2.setsWon) {
                return 1;
            //if both players have won an equal number of sets
            } else if (player1.setsWon == player2.setsWon) {
                //compare won games
                if (player1.gamesWon > player2.gamesWon) {
                    return -1;
                } else if (player1.gamesWon < player2.gamesWon) {
                    return 1;
                //if the games are also equal
                } else if (player1.gamesWon == player2.gamesWon) {
                    //sort the players by their name
                    return player1.name.localeCompare(player2.name);
                }
            }
        }
    }

    //sort the result array with the function
    result.sort(compare);

    //print the result
    console.log(JSON.stringify(result));
}