const http = require('http');

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

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

class Wormhole {
    constructor({ urls=[ '/bruh' ], port=8080 }) {
        this._urls = urls;
        this._port = port;

        this._httpServer = http.createServer((req, res) => {
            if (req.method === 'GET' && req.url && this._urls.includes(req.url)) {
                handshakeLog(`Got connection request to ${req.url} on port ${this._port}`);

                const failConnection = (status=400) => {
                    res.writeHead(status);
                    res.end();

                    console.trace();
                };

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

                if (upgradeHeader !== constants.upgradeHeaderRequirement) return failConnection();
                if (websocketVersion !== constants.websocketVersionRequirement) return failConnection();

                const websocketAccept = handshake.generateWebsocketAcceptValue(websocketKey);

                handshakeLog(websocketKey, websocketAccept);

                if (websocketAccept) {
                    res.writeHead(101, {
                        'Upgrade': 'websocket',
                        'Connection': 'Upgrade',
                        'Sec-WebSocket-Accept': websocketAccept
                    });
                    res.end();

                    const socket = new Socket({ socket: res.socket, initalState: 'CONNECTED' });

                    return true;
                }

                return failConnection();
            }
        });

        this._httpServer.listen(port);
    }
}

module.exports = Wormhole;