// requirements
const Discord = require('discord.js');
const auth = require('./auth.json');
const XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;

// voice setup
var playQueue = [];
var playVolume = [];
var queueExists = false;
var channel = null;

// coin flip
function coinFlip() {
	return (Math.floor(Math.random() * 2) == 0) ? 'heads' : 'tails';
}

// 8 ball
function eightBall() {
	var answers = [
  'Maybe.', 'Certainly not.', 'I hope so.', 'Not in your wildest dreams.',
  'There is a good chance.', 'Quite likely.', 'I think so.', 'I hope not.',
  'I hope so.', 'Never!', 'Fuhgeddaboudit.', 'Ahaha! Really?!?', 'Pfft.',
  'Sorry, bucko.', 'Hell, yes.', 'Hell to the no.', 'The future is bleak.',
  'The future is uncertain.', 'I would rather not say.', 'Who cares?',
  'Possibly.', 'Never, ever, ever.', 'There is a small chance.', 'Yes!'];
  
  return answers[(Math.floor(Math.random() * answers.length))];
}

// stupid question response
function stupidQuestion() {
    var answers = [
        'What kind of dumb question is that?', 'A real question please.',
        'Is that supposed to be a question?', 'Who asked such a dumb question?',
        'How about a good question instead?', 'Only good questions please',
        'Oh god, is that a question?', 'Are you dumb because that\'s a dumb question.'];
    
        return answers[(Math.floor(Math.random() * answers.length))];
}

function noQuestion() {
    var answers = ['it helps to ask a question...', 'question plz.', 'where is the question?'];

    return answers[(Math.floor(Math.random() * answers.length))];
}

// imgur request
function imgurRequest(subreddit, page_max)
{
    var multiSubreddit = subreddit.split(',');

    var request_url = 'https://api.imgur.com/3/gallery/r/' + multiSubreddit[getRandomInt(0, multiSubreddit.length-1)] + '/time/' + getRandomInt(1,page_max);

    var req = new XMLHttpRequest();
    var returnText = "";
    
    req.onreadystatechange = function() 
    { 
       if (req.readyState == 4 && req.status == 200) 
       {
           if(req.responseText != "Not found")
            {
                var json = JSON.parse(req.responseText);
                returnText = json.data[getRandomInt(0,json.data.length-1)].link;
            }
       }
    }
    
    req.open("GET", request_url, false);   
    req.setRequestHeader('Authorization', 'Client-ID ' + auth.imgur);
    req.send();

    return returnText;
}

// subreddit request
function subredditRequest(subreddit)
{
    var multiSubreddit = subreddit.split(',');

    var redditURL = "https://www.reddit.com/r/" + multiSubreddit[getRandomInt(0, multiSubreddit.length-1)] + "/.json?show=all&count=25&limit=100";
    var req = new XMLHttpRequest();
    var returnText = "";

    req.onreadystatechange = function()
    {
        if(req.readyState == 4 && req.status == 200)
        {
            var json = JSON.parse(req.responseText);
            returnText = json.data.children[getRandomInt(0,json.data.children.length-1)].data.url;
        }
    }

    req.open("GET", redditURL, false);
    req.send();

    return returnText;
}

// redditbooru request
function redditbooruRequest(subreddit)
{
    var multiSubreddit = subreddit.split(',');

    var url = "https://" + multiSubreddit[getRandomInt(0, multiSubreddit.length-1)] + ".redditbooru.com/images/?limit=1000";
    var req = new XMLHttpRequest();
    var returnText = "";

    req.onreadystatechange = function()
    {
        if(req.readyState == 4 && req.status == 200)
        {
            var json = JSON.parse(req.responseText);
            var imageID = getRandomInt(0, json.length);
            returnText = json[imageID].cdnUrl;
        }
    }

    req.open("GET", url, false);
    req.send();

    return returnText;
}

// wolframalpha computation
function calculate(message)
{
    var url = "http://api.wolframalpha.com/v1/result?appid=" + auth.wolframalpha + "&i=" + encodeURIComponent(message);
    var req = new XMLHttpRequest();
    var returnText = "";

    req.onreadystatechange = function()
    {
        if(req.readyState == 4 && req.status == 200)
        {
            returnText = req.responseText;
        }
    }

    req.open("GET", url, false);
    req.send();

    return returnText;
}

// get random number with starting and ending number
function getRandomInt(min, max) 
{
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

// voice setup
function setupVoice(file, volume, voice_channel)
{
    playQueue.unshift(file);
    playVolume.unshift(volume);

    if(!channel)
    {
        channel = voice_channel;
    }
    if(channel instanceof Discord.VoiceChannel)
    {
        if(!queueExists)
        {
            queueExists = true;
            channel.join().then(connection =>
            {
                handlePlayQueue(connection);
            });
        }
    }
    else
    {
        playQueue.pop();
        playVolume.pop();
        channel = null;
    }
}

// voice queue
function handlePlayQueue(connection)
{
    if (playQueue.length == 0)
    {
        return;
    }

    currentCommand = playQueue[0];
    const dispatcher = connection.playFile(currentCommand)
    dispatcher.on("end", () => 
    {
        playQueue.pop();
        playVolume.pop();

        if(playQueue.length == 0)
        {
            queueExists = false;
            if(channel != null)
            {
                channel.leave();
                channel = null;
            }
        }
        else
        {
            handlePlayQueue(connection);
        }
    });
    dispatcher.setVolume(playVolume[0]);
}

// discord setup
const client = new Discord.Client();

client.on('ready', () => {
    console.log('Bot is ready');
});

// commands
client.on('message', message => {
    if (message.content.substring(0, 2) == 'b.' || message.content.substring(0, 2) == 'B.') {
        var args = message.content.substring(2).split(' ');
        var cmd = args[0];
       
        switch(cmd)
        {
            // Reply commands
            case 'coinflip':
            case 'coin':
                message.channel.send(message.author + ' flipped a coin, it landed on **' + coinFlip() + '!**');
                break;
            case '8ball':
                if(message.content.substring(8).length > 0)
                {
                    message.channel.send(message.author + ' asked: *' + message.content.substring(8) + '*\n' +
                                        'The magic 8 ball says: **' + eightBall() + '**');
                }
                else
                {
                    message.reply(noQuestion());
                }
                break;
            case 'compute':
            case 'convert':
                if(message.content.substring(10).length > 0)
                {
                    var response = calculate(message.content.substring(10));
                    if(response == "")
                    {
                        response = stupidQuestion();
                    }
                    message.channel.send(message.author + ' wants to compute: *' + message.content.substring(10) + '*\n' +
                    'The result is: **' + response + '**')
                }
                else
                {
                    message.reply(noQuestion());
                }
                break;
            case 'calculate':
                if(message.content.substring(12).length > 0)
                {
                    var response = calculate(message.content.substring(12));
                    if(response == "")
                    {
                        response = stupidQuestion();
                    }
                    message.channel.send(message.author + ' wants to compute: *' + message.content.substring(12) + '*\n' +
                    'The result is: **' + response + '**')
                }
                else
                {
                    message.reply(noQuestion());
                }
                break;
            
            // SFW Generic Image commands
            case 'bun':
            case 'bunny':
            case 'bunnies':
                message.channel.send(imgurRequest('rabbits',5));
                break;
            case 'dankmeme':
            case 'dankmemes':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? subredditRequest('dankmemes') : imgurRequest('dankmemes', 5));
                break;

            // SFW Anime Image commands
            case 'meirl':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? subredditRequest('anime_irl') : imgurRequest('anime_irl', 5));
                break;
            case 'moe':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? redditbooruRequest('awwnime') : imgurRequest('awwnime', 5));
                break;
            case 'moe-boys':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? subredditRequest('cuteanimeboys') : imgurRequest('cuteanimeboys', 1));
                break;
            case 'hotguys':
                message.channel.send(redditbooruRequest('bishounen'));
                break;
            case 'kgirls':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? redditbooruRequest('kpics') : imgurRequest('kpics', 5));
                break;
            case 'kboys':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? imgurRequest('kfanservice',1) : ((Math.floor(Math.random() * 2) == 0) ? imgurRequest('kpecs',1) : imgurRequest('cutekboys', 1)));
                break;

            // NSFW
            case 'lewd':
                message.channel.send(redditbooruRequest('pantsu'));
                break;
            case 'ecchi':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? subredditRequest('ecchi') : imgurRequest('ecchi', 5));
                break;
            case 'hentai':
                message.channel.send((Math.floor(Math.random() * 2) == 0) ? imgurRequest('hentai', 5) : imgurRequest('Sukebei', 5));
                break;
            case 'yaoi':
                message.channel.send(imgurRequest('yaoi', 5));
                break;    
            case 'yuri':
                message.channel.send(imgurRequest('yuri', 5));
                break;
            case 'neko':
                message.channel.send(imgurRequest('yuri', 5));
                break;

            // Voice commands
            case 'join':
                channel = message.member.voiceChannel;
                channel.join();
                break;
            case 'leave':
            case 'stop':
            case 'skip':
                if(channel != null)
                {
                    channel.leave();
                    channel = null;
                }
                playQueue = [];
                break;
            case 'airhorn':
                setupVoice('voice/mlg-airhorn.mp3', 0.4, message.member.voiceChannel); 
                break;
            case 'quiethorn':
                setupVoice('voice/mlg-airhorn.mp3', 0.03, message.member.voiceChannel); 
                break;
            case 'weed':
                setupVoice('voice/smoke-weed.mp3', 0.2, message.member.voiceChannel); 
                break;
            case 'damnson':
                setupVoice('voice/damnson.mp3', 0.35, message.member.voiceChannel); 
                break;
            case 'wombo':
                setupVoice('voice/wombocombo.mp3', 0.06, message.member.voiceChannel); 
                break;
            case 'cena':
                setupVoice('voice/cena.mp3', 0.10, message.member.voiceChannel); 
                break;
            case 'triple':
                setupVoice('voice/triple.mp3', 0.20, message.member.voiceChannel); 
                break;
        }

    }
});

// login
client.login(auth.token);