#!/usr/bin/env node

/**
 * Module dependencies.
 */

var app = require('../app');
var debug = require('debug')('webrtc-poc:server');
var http = require('http');
var socketio = require('socket.io');
var Turn = require('node-turn');

/**
 * Get port from environment and store in Express.
 */

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

/**
 * Create HTTP server.
 */

var server = http.createServer(app);
var io = socketio(server);

/**
 * Handle signaling events
 */
io.on('connection', socket => {
    console.log('Socket connected:', socket.id, 'at',
        socket.request.connection.remoteAddress);
    socket.on('disconnect', () => {
        console.log('Socket disconnected:', socket.id, 'at', socket.request.connection.remoteAddress)
    });
    // Broadcast the client's offer
    socket.on('join-offer', offer => {
        console.log('Broadcast join-offer event from', socket.id);
        socket.broadcast.emit('join-offer', offer);
    });
    socket.on('join-answer', answer => {
        let dstSocket = JSON.parse(answer).dst;
        console.log('Relaying join-answer event from', socket.id, 'to', dstSocket);
        io.sockets.sockets.get(dstSocket).emit('join-answer', answer);
    });
    socket.on('join', info => {
        console.log('Broadcast join event from', socket.id);
        socket.broadcast.emit('join', info);
    });
    socket.on('leave', id => {
        socket.broadcast.emit('leave', id);
    });
});

var turn_server = new Turn();
turn_server.start();

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
    var port = parseInt(val, 10);

    if (isNaN(port)) {
        // named pipe
        return val;
    }

    if (port >= 0) {
        // port number
        return port;
    }

    return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
    if (error.syscall !== 'listen') {
        throw error;
    }

    var bind = typeof port === 'string'
        ? 'Pipe ' + port
        : 'Port ' + port;

    // handle specific listen errors with friendly messages
    switch (error.code) {
        case 'EACCES':
            console.error(bind + ' requires elevated privileges');
            process.exit(1);
            break;
        case 'EADDRINUSE':
            console.error(bind + ' is already in use');
            process.exit(1);
            break;
        default:
            throw error;
    }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
    var addr = server.address();
    var bind = typeof addr === 'string'
        ? 'pipe ' + addr
        : 'port ' + addr.port;
    debug('Listening on ' + bind);
}