const fs = require('fs');
var express = require('express');
var app = express();
var router = express.Router();
var upload = require('./app/config/multer.config.js');
 
const {Docker} = require('node-docker-api');
 
const docker = new Docker({ socketPath: '/var/run/docker.sock' });

global.__basedir = __dirname;

app.use(express.static('resources'));

var http = require('http').createServer(app);
var io = require('socket.io')(http);

var docker_build = (socket, sessionID) => {
    console.log('[server][start]', sessionID);
    socket.emit('start')
    path = process.cwd()
    fs.mkdir(path + '/output/' + sessionID.toString(), () => {
        socket.emit('update', 'Output directort created.')
    })
    docker.container.create({
        Image: 'python:3.8',
        Cmd: [ '/bin/bash', '-c', 'cd /tsp && pip install -r requirements.txt && python main.py data/simple/ulysses16.tsp && cp output/* /output' ],
        HostConfig: {
            Binds: [
                path.toString() + '/com2014-template:/tsp',
                path.toString() + "/output/" + sessionID.toString() + "/output"
            ]
        }
      })
    .then(container => container.start())
    .then(container => container.logs({
        follow: true,
        stdout: true,
        stderr: true
    }))
    .then(stream => {
        stream.on('data', info => socket.emit('update', new Buffer.from(info).toString('ascii')))
        stream.on('error', err => console.log(err))
    })
    .catch(error => console.log(error));
};

var clients = 0;

io.on('connection', (socket) => {
    const sessionID = socket.id;
    console.log('[client][connection]', sessionID);
    clients = clients + 1;
    io.sockets.emit('users_count', clients);

    socket.on('disconnect', () => {
        clients = clients - 1;
        console.log('[client][disconnect]', sessionID)
        io.sockets.emit('users_count', clients);
    });

    socket.on('build', () => {
        console.log('[client][build]', sessionID);
        docker_build(socket, sessionID);
    });

});

require('./app/routers/file.router.js')(app, router, upload);

// Create a Server
var server = http.listen(8081, () => {
 
    var host = server.address().address
    var port = server.address().port
 
    console.log("App listening at http://%s:%s", host, port); 
})