const express = require('express');
const app = express();
const port = 2428;

const server = app.listen(port, () => console.log(`ARNweb API running on port ${port}`))

var io = require('socket.io').listen(server, { path: '/chat/socket.io' })
var striptags = require('striptags');
var MarkdownIt = require('markdown-it'),
    md = new MarkdownIt();
var users = [];

const os = require("os");
const si = require('systeminformation');
var sysInfo;

const gameQuery = require('game-server-query');
const fs = require('fs');
let rawdata = fs.readFileSync(__dirname + "/node_modules/game-server-query/games.json");
const games = JSON.parse(rawdata);

// Request documentation
app.get('/', (req, res) =>
    res.sendFile(__dirname + "/index.html")
);

// Function for easy server broadcasts
function serverMsg(content) {
    return {
        'username': 'Server',
        'mailHash': '470965550d3f019830c421f0535d9268',
        'message': content
    }
}

// Socket.io server side
io.on('connection', function (socket) {
    // Send identification request to client
    socket.emit('user_identify');

    // Bind username and mailhash to client
    socket.on('user_login', function (user) {
        socket.username = user.username;
        socket.mailHash = user.mailHash;
        if (users.length > 0) {
            socket.emit('message_receive', serverMsg(`Hello ${socket.username}, welcome to ARNweb Chat. The following people are currently online: ${users.join(', ')}`));
        } else {
            socket.emit('message_receive', serverMsg(`Hello ${socket.username}, welcome to ARNweb Chat. You are the only one here at the moment`));
        }

        io.emit('message_receive', serverMsg(`${socket.username} has connected`));
        users.push(socket.username);
    });

    // Send disconnect broadcast to all clients
    socket.on('disconnect', function () {
        io.emit('message_receive', serverMsg(`${socket.username} has disconnected`));
        users.splice(users.indexOf(socket.username), 1);
    });

    // Handle messages
    socket.on('message_send', function (message) {
        // Build message data for clients
        var message = striptags(message, '<br />');
        if (message !== '') {
            message = md.render(message);
            message = message.replace(/\r?\n/g, '<br />');
            var msg = {
                'username': socket.username,
                'mailHash': socket.mailHash,
                'message': message
            }
            // Send message to clients
            io.emit('message_receive', msg);
        } else {
            socket.emit('message_receive', serverMsg(`Empty messages will not be sent.`));
        }
    });
});


// Chat socket and info
app.get('/chat/', function (req, res) {
    // Server browser
    res.json({
        "status": "online",
        "users": users
    });
});

// System info
app.get('/system/', function (req, res) {
    var time = new Date();
    sysInfo = {
        "hostname": os.hostname(),
        "type": os.type(),
        "load": os.loadavg(),
        "time": si.time()
    };
    si.cpuTemperature(function (data) {
        sysInfo["temp"] = data;
    });
    si.mem(function (data) {
        sysInfo["mem"] = data;
        res.json(sysInfo);
    });
});

app.get('/css/:stylesheet', function (req, res) {
    res.sendFile(__dirname + '/css/' + req.params.stylesheet);
})

// Game servers
app.get('/:type/:host', function (req, res) {
    if (games[req.params.type] != undefined) {
        gameQuery(
            {
                type: req.params.type,
                host: req.params.host
            },
            function (state) {
                res.json(state);
            }
        );
    } else {
        res.json({ "error": "Error: Game type unknown." });
    }
});