bot.js

var Discord = require('discord.io');
var logger = require('winston');
var auth = require('./auth.json');
// Configure logger settings
logger.remove(logger.transports.Console);
logger.add(new logger.transports.Console, {
    colorize: true
});
logger.level = 'debug';
// Initialize Discord Bot
var bot = new Discord.Client({
   token: auth.token,
   autorun: true
});
bot.on('ready', function (evt) {
    logger.info('Connected');
    logger.info('Logged in as: ');
    logger.info(bot.username + ' - (' + bot.id + ')');
});

function checkScore(roll, score) {
	var level = 0;
	if (roll == 1 || roll == score) //Holy mary!
		level = 1;
	else if (roll == 100) //Holy... fuck!
		level = 6;
	else if (roll <= 5 || ((1 <= (score-roll)) && ((score-roll) <= 5)) || ((roll % 11) == 0 && roll < score)) // Critical!
		level = 2;
	else if (roll < score) // OK!
		level = 3;
	else if (roll > 95 || ((1 <= (roll-score)) && ((roll-score) <= 5)) || ((roll % 11) == 0 && roll > score)) // Oh no!
		level = 5;
	else if (roll > score)// OK!
		level = 4;
	return level;
}

function getResult(level) {
	var ret = '';
	switch (level) {
		case (1):
			ret = "**CRITICAL SUCCESS!**";
			break;
		case (2):
			ret = "**Good success**";
			break;
		case (3):
			ret = "**Success**";
			break;
		case (4):
			ret = "**Failure**";
			break;
		case (5):
			ret = "**Bad failure**";
			break;
		case (6):
			ret = "**CRITICAL FAILURE!**";
			break;
	}
	return ret;
}

bot.on('message', function (user, userID, channelID, message, evt) {
    // Our bot needs to know if it will execute a command
    // It will listen for messages that will start with `!`
    if (message.substring(0, 1) == '!') {
        var args = message.substring(1).split(' ');
        var cmd = args[0];
       
        args = args.splice(1);
        switch(cmd) {
            // !roll
            case 'roll':
		var skill = args[0];
		var score = args[1];
		var roll = Math.floor(Math.random() * 100) + 1; //Return a number between 1 and 100
		var message_flipFlop = '';

		if (skill == undefined || skill == '') {
			var skill = 'unknown';
		}

		if (score != undefined && score != '') {
			var level = checkScore(roll, score);
		}

		if (skill.substring(0, 1) == '*') { //Favorite skill, I can flip-flop
			skill = skill.substring(1) + ' (favorite)';
			if (roll >= 10 || roll < 100) { // Try to flip-flop it
				var roll_flipFlop = (roll % 10) * 10 + Math.floor(roll/10);
				var level_flipFlop = checkScore(roll_flipFlop, score);
				if (level_flipFlop < level) { // Better flip-flopped!
					level = level_flipFlop;
					message_flipFlop = '. Flip-flop into ' + roll_flipFlop;
				}
			}
		}

		// Basic message
		var message = user + " rolled " + roll + " for " + skill;

		bot.sendMessage({
			to: channelID,
			message: '`' + message + message_flipFlop + '` ' + getResult(level)
		});
		break;
						
		case '1d10':
			var skill = args[0];
			var roll = Math.floor((Math.random() + 0.1) * 10) ; //Return a number between 1 and 10

			// Basic message
			var message = user + " rolled " + roll;

			// In case of additional information, I write it down
			if (skill != undefined && skill != '') {
				message += ' for ' + skill;
			}

			bot.sendMessage({
				to: channelID,
				message: '`' + message + '`'
			});
		break;
         }
     }
});