import { expose } from '@pushrocks/smartspawn';
import * as plugins from './smartproxy.plugins';
import { SmartproxyRouter } from './smartproxy.classes.router';

export class ProxyWorker {
  public hostCandidates: plugins.tsclass.network.IReverseProxyConfig[] = [];
  public httpsServer: plugins.https.Server; // | plugins.http.Server;
  public port = 8001;
  public router = new SmartproxyRouter();

  public async setPort(portArg: number) {
    this.port = portArg;
  }

  /**
   * starts the proxyInstance
   */
  public async start() {
    this.httpsServer = plugins.https.createServer(async (req, res) => {
      const destinationConfig = this.router.routeReq(req);
      const response = await plugins.smartrequest.request(
        `http://${destinationConfig.destinationIp}:${destinationConfig.destinationPort}${req.url}`,
        {
          method: req.method,
          headers: req.headers
        },
        true // lets make this streaming
      );
      res.statusCode = response.statusCode;
      for (const header of Object.keys(response.headers)) {
        res.setHeader(header, response.headers[header]);
      }
      response.on('data', data => {
        res.write(data);
      });
      response.on('end', () => {
        res.end();
      });
    });

    const Websocket = await import('ws');

    // Enable websockets
    const wss = new plugins.ws.Server({ server: this.httpsServer });
    wss.on('connection', function connection(ws) {
      const wscConnected = plugins.smartpromise.defer();
      
      const wsc = new Websocket.default(`${ws.url}`);
      wsc.on('open', () => {
        wscConnected.resolve();
      });

      ws.on('message', async message => {
        await wscConnected.promise;
        wsc.emit('message', message);
      });
      wsc.on('message', message => {
        ws.emit('message', message);
      });

      // handle closing
      ws.on('close', message => {
        wsc.close();
      });
      wsc.on('close', message => {
        ws.close();
      });
    });

    this.httpsServer.listen(this.port);
    console.log(`OK: now listening for new connections on port ${this.port}`);
  }

  public async updateCandidates(arrayOfReverseCandidates: plugins.tsclass.IReverseProxyConfig[]) {
    this.hostCandidates = arrayOfReverseCandidates;
    this.router.setNewCandidates(arrayOfReverseCandidates);
    for (const hostCandidate of this.hostCandidates) {
      this.httpsServer.addContext(hostCandidate.hostName, {
        cert: hostCandidate.publicKey,
        key: hostCandidate.privateKey
      });
    }
  }

  public async stop() {
    const done = plugins.smartpromise.defer();
    this.httpsServer.close(() => {
      done.resolve();
    });
    await done.promise;
  }
}

const proxyWorkerInstance = new ProxyWorker();

// the following is interesting for the master process only
const proxyWorkerCalls = {
  stop: async () => {
    await proxyWorkerInstance.stop();
  },
  start: async () => {
    await proxyWorkerInstance.start();
  },
  updateReverseConfigs: async (configArray: plugins.tsclass.network.IReverseProxyConfig[]) => {}
};

export type TProxyWorkerCalls = typeof proxyWorkerCalls;
expose(proxyWorkerCalls);
console.log('ProxyWorker initialized');