const EventEmitter = require('events');

const { createLog } = require('./logger');
const constants = require('./constants');
const Socket = require('./Socket');
const ConnectingSocket = require('./ConnectingSocket');

const handshakeLog = createLog([ 'Wormhole', 'Handshake' ]);

class Wormhole extends EventEmitter {
    constructor({ urls=[ '/bruh' ], httpServer }) {
        super();

        this._urls = urls;
        this._httpServer = httpServer;

        this._sockets = [];

        this._httpServer.on('request', (req, res) => {
            if (req.method === 'GET' && req.url && this._urls.includes(req.url)) {
                // TODO: check for origin header
                handshakeLog(`Got connection request to ${req.url}`);

                const websocketKey = req.headers['sec-websocket-key'];
                const upgradeHeader = req.headers['upgrade'];
                const websocketVersion = req.headers['sec-websocket-version'];

                let socket = new Socket({ socket: res.socket, initalState: constants.states.CONNECTING });
                let connectingSocket = new ConnectingSocket({ res, socket, upgradeHeader, websocketKey, websocketVersion });
                
                const connectionFunctions = connectingSocket.connectionFunctions();
                if (!connectionFunctions) return connectingSocket.rejectConnection(400);
                
                const { accept, reject } = connectionFunctions;

                this.emit('connect', { connectingSocket, accept, reject });
            }
        });
    }
}

module.exports = Wormhole;