import * as plugins from './smartuniverse.plugins';

import { Handler, Route, Server } from '@pushrocks/smartexpress';
import { UniverseCache, UniverseChannel, UniverseMessage } from './';

import * as paths from './smartuniverse.paths';

import * as interfaces from './interfaces';
import { UniverseConnection } from './smartuniverse.classes.universeconnection';

export interface ISmartUniverseConstructorOptions {
  messageExpiryInMilliseconds: number;
  externalServer?: plugins.smartexpress.Server;
}

/**
 * main class that setups a Universe
 */
export class Universe {
  // subinstances
  public universeCache: UniverseCache;

  // options
  private options: ISmartUniverseConstructorOptions;

  /**
   * the smartexpress server used
   */
  private smartexpressServer: plugins.smartexpress.Server;

  /**
   * the smartsocket used
   */
  private smartsocket: plugins.smartsocket.Smartsocket;

  constructor(optionsArg: ISmartUniverseConstructorOptions) {
    this.options = optionsArg;
    this.universeCache = new UniverseCache(this, this.options.messageExpiryInMilliseconds);
  }

  /**
   * stores the version of the universe server running
   * this is done since the version is exposed through the api and multiple fs actions are avoided this way.
   */
  private universeVersionStore: string;

  /**
   * get the currently running version of smartuniverse
   */
  public getUniverseVersion() {
    if (this.universeVersionStore) {
      return this.universeVersionStore;
    } else {
      const packageJson = plugins.smartfile.fs.toObjectSync(paths.packageJson);
      this.universeVersionStore = packageJson.version;
      return this.universeVersionStore;
    }
  }

  /**
   * adds a channel to the Universe
   */
  public addChannel(nameArg: string, passphraseArg: string) {
    const newChannel = UniverseChannel.createChannel(this, nameArg, passphraseArg);
    return newChannel;
  }

  /**
   * returns a channel
   */
  public getChannel(channelNameArg: string) {
    return this.universeCache.channelMap.find(channelArg => {
      return channelArg.name === channelNameArg;
    });
  }

  /**
   * initiates a server
   */
  public async start(portArg: number) {
    // lets create the base smartexpress server
    if (!this.options.externalServer) {
      this.smartexpressServer = new plugins.smartexpress.Server({
        cors: true,
        defaultAnswer: async () => {
          return `smartuniverse server ${this.getUniverseVersion()}`;
        },
        forceSsl: false,
        port: portArg
      });
    } else {
      console.log('Universe is using externally supplied server');
      this.smartexpressServer = this.options.externalServer;
    }

    // add websocket upgrade
    this.smartsocket = new plugins.smartsocket.Smartsocket({});

    // add a role for the clients
    const ClientRole = new plugins.smartsocket.SocketRole({
      name: 'UniverseClient',
      passwordHash: plugins.smarthash.sha256FromStringSync('UniverseClient') // authentication happens on another level
    });

    // add the role to smartsocket
    this.smartsocket.addSocketRoles([ClientRole]);

    const socketFunctionSubscription = new plugins.smartsocket.SocketFunction<
      interfaces.ISocketRequest_SubscribeChannel
    >({
      allowedRoles: [ClientRole], // there is only one client role, Authentication happens on another level
      funcName: 'subscribeChannel',
      funcDef: async (dataArg, socketConnectionArg) => {
        const universeConnection = new UniverseConnection({
          universe: this,
          socketConnection: socketConnectionArg,
          authenticationRequests: [dataArg]
        });
        await UniverseConnection.addConnectionToCache(this, universeConnection);
        return {
          subscriptionStatus: 'subscribed'
        };
      }
    });

    const socketFunctionProcessMessage = new plugins.smartsocket.SocketFunction({
      allowedRoles: [ClientRole], // there is only one client role, Authentication happens on another level
      funcName: 'processMessage',
      funcDef: async (dataArg: interfaces.IUniverseMessage, socketConnectionArg) => {
        const universeConnection = UniverseConnection.findUniverseConnectionBySocketConnection(
          this.universeCache,
          socketConnectionArg
        );
        if (universeConnection) {
          plugins.smartlog.defaultLogger.log(
            'ok',
            'found UniverseConnection for socket for incoming message'
          );
        } else {
          plugins.smartlog.defaultLogger.log(
            'warn',
            'found no Authorized channel for incoming message'
          );
          return {
            error: 'You need to authenticate for a channel'
          };
        }
        const unauthenticatedMessage = UniverseMessage.createMessageFromPayload(
          socketConnectionArg,
          dataArg
        );
        const foundChannel = await UniverseChannel.authorizeAMessageForAChannel(
          this.universeCache,
          unauthenticatedMessage
        );
        if (foundChannel && unauthenticatedMessage.authenticated) {
          const authenticatedMessage = unauthenticatedMessage;
          await this.universeCache.addMessage(authenticatedMessage);
        }
      }
    });

    // add socket functions
    this.smartsocket.addSocketFunction(socketFunctionSubscription);
    this.smartsocket.addSocketFunction(socketFunctionProcessMessage);

    // start the server
    if (!this.options.externalServer) {
      await this.smartexpressServer.start();
    }

    // add smartsocket to the running smartexpress app
    await this.smartsocket.setExternalServer('smartexpress', this.smartexpressServer);
    await this.smartsocket.start();
    plugins.smartlog.defaultLogger.log('success', 'started universe');
  }

  /**
   * stop everything
   */
  public async stopServer() {
    await this.smartsocket.stop();
    if (!this.options.externalServer) {
      await this.smartexpressServer.stop();
    }
  }
}