@cycxllin/cmpt315-a2/biggestLoser.js

Fulfills CMPT 315 Assignment 2, MacEwan University Winter 2024.

/*
Finds the player with the most loser points.
    If a player is the winner, the loser_points are subtracted, and if a player is a loser, 
    then the loser_points are added. Find the player with the largest tally of loser_points.
Requires: participants.js (function which creates a list of participants)
Parameters: Parameters: array of matches where each match is a dictionary containing the
    following key: values
        winner: string
        loser: string
        loser-points: number
Returns: string of player with the most loser points
*/
const participants = require('./participants.js');

function biggestLoser(matches) {
    if (Array.isArray(matches)){
        const points = {};

        // make list of players and add to points object as keys
        players = participants(matches);

        players.forEach(player => {
            points[player] = 0;
        });

        // update points for each match
        matches.forEach(match =>{
            let winner = match.winner;
            let loser = match.loser;
            let loser_points = match.loser_points;

            // update points
            points[winner] = points[winner] - loser_points;
            points[loser] = points[loser] + loser_points;
        });

        // Find the biggest loser
        let bLoser = players[0]

        players.forEach(player => {
            if (points[player] > points[bLoser]){
                bLoser = player;
            }
        });

        return bLoser;

    } else {
        console.error("Error: Parameter passed is not an array");
        return -1;
    }
}

module.exports = biggestLoser;