import * as plugins from './smartsocket.plugins.js';
import * as pluginsTyped from './smartsocket.pluginstyped.js';

// used in case no other server is supplied
import { Smartsocket } from './smartsocket.classes.smartsocket.js';
import { logger } from './smartsocket.logging.js';

/**
 * class socketServer
 * handles the attachment of socketIo to whatever server is in play
 */
export class SocketServer {
  private smartsocket: Smartsocket;
  private httpServerDeferred: plugins.smartpromise.Deferred<any>;
  private httpServer: pluginsTyped.http.Server | pluginsTyped.https.Server;
  
  /**
   * wether httpServer is standalone
   */
  private standaloneServer = false;

  constructor(smartSocketInstance: Smartsocket) {
    this.smartsocket = smartSocketInstance;
  }

  /**
   * starts the server with another server
   * also works with an express style server
   */
  public async setExternalServer(
    serverType: 'smartexpress',
    serverArg: pluginsTyped.smartexpress.Server
  ) {
    this.httpServerDeferred = plugins.smartpromise.defer();
    await serverArg.startedPromise;
    this.httpServer = serverArg.httpServer;
    this.httpServerDeferred.resolve();
  }

  /**
   * gets the server for socket.io
   */
  public async getServerForSocketIo() {
    if (this.httpServerDeferred) {
      await this.httpServerDeferred.promise;
    }
    if (this.httpServer) {
      return this.httpServer;
    } else {
      const httpModule = await this.smartsocket.smartenv.getSafeNodeModule('http');
      this.httpServer = new httpModule.Server();
      this.standaloneServer = true;
      return this.httpServer;
    }
  }

  /**
   * starts listening to incoming sockets:
   */
  public async start() {
    const done = plugins.smartpromise.defer();

    // handle http servers
    // in case an external server has been set "this.standaloneServer" should be false
    if (this.httpServer && this.standaloneServer) {
      if (!this.smartsocket.options.port) {
        logger.log('error', 'there should be a port specifed for smartsocket!');
        throw new Error('there should be a port specified for smartsocket');
      }
      this.httpServer.listen(this.smartsocket.options.port, () => {
        logger.log(
          'success',
          `Server started in standalone mode on ${this.smartsocket.options.port}`
        );
        done.resolve();
      });
    } else {
      done.resolve();
    }

    // nothing else to do if express server is set
    await done.promise;
    return;
  }

  /**
   * closes the server
   */
  public async stop() {
    if (this.httpServer) {
      this.httpServer.close();
    }
  }
}