bot.js

const Discord = require('discord.js');
const client = new Discord.Client();

var activeMaps = ['vertigo', 'dust2', 'inferno', 'mirage', 'nuke', 'overpass', 'ancient'];
var allMaps = ['cache', 'cobble', 'inferno', 'mirage', 'nuke', 'overpass', 'train', 'vertigo', 'dust2', 'canals', 'zoo', 'biome', 'abbey', 'ancient'];
var jbmevidroTournamentMaps = ['2towers', 'caribbean_dolnma', 'crashz_dust_v2', 'desert2', 'dust2', 'grass2','nuke2020', 'poolparty', 'ramps_lego', 'redline', 'ancient'];
var pickSide = ['heads', 'tails'];
var mapPool = [];
var allowBan = false;
var bestOfSelected = false;
var bestOf;

client.on('message', message => {
    if (message.content.toLowerCase() === '!mapveto' || message.content.toLowerCase() === '!map veto' || message.content.toLowerCase() === '!veto') {
        message.reply('Enter !veto bo1  OR  !veto bo3  OR  !veto popflash pug');
        bestOfSelected = false;
        allowBan = false;
    }
    else if (message.content.toLowerCase() === '!veto popflash pug' && !allowBan && !bestOfSelected) {
        bestOf = 1;
        bestOfSelected = true;
        mapPool = allMaps.slice(0);
        message.reply('PUG Map Veto starting: Type !veto MapName to ban any of the following maps: ' + mapPool);
        allowBan = true;
    }
    else if (message.content.toLowerCase() === '!veto flipcoin' || message.content.toLowerCase() === '!veto flipacoin') {
        message.reply('the coin has landed on ' + pickSide[Math.floor(Math.random() * pickSide.length)] + '.');
    }
    else if (message.content.toLowerCase() === '!veto bo1' && !allowBan && !bestOfSelected) {
        bestOf = 1;
        bestOfSelected = true;
        allowBan = false;
        message.reply('Enter !Veto ActiveDuty OR !Veto Popflash OR !veto JB.MEVID.RO for a best of ' + bestOf + "match.");
    }
    else if (message.content.toLowerCase() === '!veto bo3' && !allowBan && !bestOfSelected) {
        bestOf = 3;
        bestOfSelected = true;
        allowBan = false;
        message.reply('Enter !Veto ActiveDuty  OR  !Veto Popflash for a best of ' + bestOf + "match.");
    }
    else if (message.content.toLowerCase() === '!veto activeduty' && !allowBan && bestOfSelected) {
        mapPool = activeMaps.slice(0);
        message.reply('Active Duty Map Veto starting: Type !veto MapName to ban any of the following maps: ' + mapPool);
        allowBan = true;
    }
    else if (message.content.toLowerCase() === '!veto popflash' && !allowBan && bestOfSelected) {
        mapPool = allMaps.slice(0);
        message.reply('Popflash Map Veto starting: Type !veto MapName to ban any of the following maps: ' + mapPool);
        allowBan = true;
    }
    else if (message.content.toLowerCase() === '!veto jb.mevid.ro' && !allowBan && bestOfSelected) {
        mapPool = jbmevidroTournamentMaps.slice(0);
        message.reply('Map Veto starting for Tournament 1v1 JB.MEVID.RO: Type !veto MapName to ban any of the following maps: ' + mapPool);
        allowBan = true;
    }
    else if (message.content.toLowerCase().indexOf('!veto maplist') === 0 && !allowBan && bestOfSelected) {
        mapPool = message.content.slice(13).split(',').map(function (m) { return m.toLowerCase().trim(); });
        message.reply('Map list:' + mapPool);
        allowBan = true;
    }
    else if (message.content.toLowerCase() === '!mapsleft' && allowBan) {
        message.reply("Maps left: " + mapPool + " (" + (mapPool.length - 1) + ")");
    }
    else if (message.content.toLowerCase() === '!veto help') {
        message.reply("Need help with the Veto Bot? Visit https://github.com/lui2k/csgo-discord-veto or contact the developer: Lui2k#3225 ");
    }
    else if (message.content.toLowerCase() === '!randommap' || message.content.toLowerCase() === '!random map') {
        message.reply(activeMaps[Math.floor(Math.random() * activeMaps.length)]);
    }
    else if (message.content.toLowerCase() === '!randompopflashmap' || message.content.toLowerCase() === '!random popflash map') {
        message.reply(allMaps[Math.floor(Math.random() * allMaps.length)]);
    }
    else if (message.content.toLowerCase().indexOf('!veto ') === 0 && allowBan) {
        var map = message.content.toLowerCase().slice(5).trim();
        if (mapPool.indexOf(map) !== -1) {
            mapPool = mapPool.filter(function (m) { return m !== map; });
            message.reply(map[0].toUpperCase() + map.slice(1) + ' removed. Maps left: ' + mapPool);
            if (mapPool.length == bestOf) {
                message.reply("you will play on " + mapPool + " (BO" + bestOf + "). Good luck, have fun!");
                allowBan = false;
                bestOfSelected = false;
            }
        }
        else {
            message.reply("Unrecognized command or map is missing from map pool '" + map + "', available maps for veto are: " + mapPool);
        }
    }
});

client.login(process.env.BOT_TOKEN);