const Discord = require('discord.js');
const bot = new Discord.Client();
const fs = require('fs')
const moment = require('moment');
const mysql = require('mysql');

const con = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: "",
  database: 'j4f_tokens',
});

con.connect((err) => {
  // if (err) throw err;
  console.log('Connected to mySQL Server.');
  console.log('DATABASE = j4f_tokens');
});

bot.login('');

let userData = JSON.parse(fs.readFileSync('Storage/userData.json', 'utf8'));

const modRole = "administrator";


bot.on('message', message => {

    let sender = message.author;
    let msg = message.content.toUpperCase();
    let prefix = '$';

    if (bot.user.id === message.author.id) {return}

    let userData = JSON.parse(fs.readFileSync('Storage/userData.json', 'utf8'));

    if (!userData[sender.id + message.guild.id]) userData[sender.id + message.guild.id] = {}
    if (!userData[sender.id + message.guild.id].money) userData[sender.id + message.guild.id].money = 0;
    if (!userData[sender.id + message.guild.id].lastDaily) userData[sender.id + message.guild.id].lastDaily = "Not collected";
    if (!userData[sender.id + message.guild.id].username) userData[sender.id + message.guild.id].username = message.author.username;

    if (message.content == prefix + "ping") {
        message.channel.sendMessage('Pong!');
    }

    if (message.content == prefix + "give") {

        if (!message.member.hasPermission('ADMINISTRATOR')) return message.channel.sendMessage("You need the role '" + modRole + "' to use this command!");

    const userMention = message.mentions.users.first();

        let definedUser = '';
        if (!userMention) {
            definedUser = message.author.id;


           userData[message.author.id + message.guild.id].money + 1;
            message.channel.sendMessage("You gave " + message.author.username + " 1 extra J4Token!");

            return;
        } else {
            definedUser = firstMentioned.id;
            userData[firstMentioned.id + message.guild.id].money + 1;
            message.channel.sendMessage("You gave 1 " + definedUser + " extra J4Token!");

        }
    }
    if (message.content == prefix + 'balance') {
            let pointsFromTokenSQL = 'SELECT points FROM tokens WHERE name = ?';
            const name = [message.author.id];
            pointsFromTokenSQL = mysql.format(pointsFromTokenSQL, name);
            con.query(pointsFromTokenSQL, (err, result) => {
              let resultJsonObj = result;
              console.log(resultJsonObj);
              console.log(resultJsonObj('points'));
              const pointsReturn = resultJsonObj[0].points;
              console.log('anything')
              // const points = pointsReturn.slice(0);
                const embed = new Discord.MessageEmbed()
                  .setColor(0xa9ef27)
                  .setTitle(`**Your J4Tokens ${message.author.tag.slice(0, -5)}**`)
                  .addField('**Tokens**', (pointsReturn))

                message.channel.send({embed:{
                fields: [ { title: "J4F Tokens:", value: resultJsonObj[0].points } ]
                }
            });
          });
        }

         if (message.content == prefix + 'daily') {
             if (userData[sender.id + message.guild.id].lastDaily != moment().format('L')) {
                 userData[sender.id + message.guild.id].lastDaily = moment().format('L');
                 userData[sender.id + message.guild.id].money += 1;
                 const pointsRandom = (Math.floor(Math.random() * 18) + 5);

                 let fromUserPointsSQL = 'SELECT * FROM tokens WHERE name = ?';
                 const name = [message.author.id];
                 fromUserPointsSQL = mysql.format(fromUserPointsSQL, name);

                 let setPointsSQL = `UPDATE tokens SET points = points + 1 WHERE name = ?`;
                 setPointsSQL = mysql.format(setPointsSQL, name);

                 con.query(fromUserPointsSQL, (err0, resultName) => {
                   if (err0) throw err0;
                   if (resultName.length > 0) {
                       con.query(setPointsSQL, (err1) => {
                         if (err1) throw err1;
                     message.channel.sendMessage({embed:{
                     title:"Daily Token",
                     color: 0xa9ef27,
                     description:"You received a shiny golden j4token. (We added it to your account!)"
                 }})
                         console.log(`${message.author} got 1 points!`);
                           if (err2) throw err2;
                       });
                   } else {
                     const newUser = [
                       [`${message.author.id}`, `${message.author.tag}`, 1],
                     ];
                     con.query('INSERT INTO tokens (`name`, `username`, `points`) VALUES ?', [newUser], (err3) => {
                       if (err3) throw err3;
                       console.log('1 record inserted');
                       message.channel.sendMessage({embed:{
                         title:"Daily Token",
                         color: 0xa9ef27,
                         description:"You received a shiny golden j4token. (We added it to your account!)"
                     }})
                     });
                   }
                 });
             } else {
                 message.channel.sendMessage({embed:{
                     title:"Daily Token",
                     color: 0xa9ef27,
                     description:"Mmmm... Seems like you already got your daily J4Token. Check back in " + moment().endOf('day').fromNow() + '.'
                 }})
             }
         }

    if(message.content == prefix + "global") {

        var globalMoney = 0;
        var globalUsers = 0;
        var globalRichest = '';
        var globalRichest$ = 0;

        for (var i in userData) {
                globalMoney += userData[i].money;
                globalUsers += 1;
                if (userData[i].money > globalRichest$) {
                    globalRichest$ = userData[i].money;
                    globalRichest = userData[i].username;
                }
        }
        message.channel.sendMessage({"embed":{
                    title: "Global Overview.",
                    color: 0xa9ef27,
                    fields: [{
                        name:"J4Tokens in existence:",
                        value:globalMoney,
                        inline:true
                    }]
                }});

    }

    fs.writeFile('Storage/userData.json', JSON.stringify(userData), (err) => {
      //  if (err) console.error(err);
    });

    bot.on('ready', () => {
        console.log('Economy launched...');
    });

});

ERROR
/////////////////////////////

C:\Users\Admin\Desktop\Discord Bot J4F>node .
undefined:1



SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at Object.<anonymous> (C:\Users\Admin\Desktop\Discord Bot J4F\index.js:22:21)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Function.Module.runMain (module.js:684:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3