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

import { Objectmap } from '@pushrocks/lik';
import { Observable } from 'rxjs';
import { Smartsocket, SmartsocketClient } from '@pushrocks/smartsocket';
import * as url from 'url';

import * as interfaces from './interfaces';

import { ClientUniverseChannel, ClientUniverseMessage } from './';
import { ClientUniverseCache } from './smartuniverse.classes.clientuniversecache';

export interface IClientOptions {
  serverAddress: string;
  autoReconnect: boolean;
}

/**
 * this class is for client side only!!!
 * allows connecting to a universe server
 */
export class ClientUniverse {
  public options: IClientOptions;
  public smartsocketClient: plugins.smartsocket.SmartsocketClient;
  public messageRxjsSubject = new plugins.smartrx.rxjs.Subject<ClientUniverseMessage<any>>();
  public clientUniverseCache = new ClientUniverseCache();

  constructor(optionsArg: IClientOptions) {
    this.options = optionsArg;
  }

  /**
   * adds a channel to the channelcache
   * TODO: verify channel before adding it to the channel cache
   */
  public addChannel(channelNameArg: string, passphraseArg: string) {
    const existingChannel = this.getChannel(channelNameArg);

    if (existingChannel) {
      throw new Error('channel exists');
    }

    // lets create the channel
    const clientUniverseChannel = ClientUniverseChannel.createClientUniverseChannel(
      this,
      channelNameArg,
      passphraseArg
    );
    return clientUniverseChannel;
  }

  /**
   * gets a channel from the channelcache
   * @param channelName
   * @param passphraseArg
   */
  public getChannel(channelName: string): ClientUniverseChannel {
    const clientUniverseChannel = this.clientUniverseCache.channelMap.find(channel => {
      return channel.name === channelName;
    });
    return clientUniverseChannel;
  }

  /**
   * remove a a achannel
   * @param messageArg
   */
  public removeChannel(channelNameArg, notifyServer = true) {
    const clientUniverseChannel = this.clientUniverseCache.channelMap.findOneAndRemove(
      channelItemArg => {
        return channelItemArg.name === channelNameArg;
      }
    );
  }

  public async start() {
    await this.checkConnection();
  }

  public async stop() {
    await this.disconnect('triggered');
  }

  /**
   * checks the connection towards a universe server
   * since password validation is done through other means, a connection should always be possible
   */
  public async checkConnection(): Promise<void> {
    if (!this.smartsocketClient) {
      const parsedURL = url.parse(this.options.serverAddress);
      const socketConfig: plugins.smartsocket.ISmartsocketClientOptions = {
        alias: 'universeclient',
        password: 'UniverseClient',
        port: parseInt(parsedURL.port, 10),
        role: 'UniverseClient',
        url: parsedURL.protocol + '//' + parsedURL.hostname
      };
      this.smartsocketClient = new SmartsocketClient(socketConfig);

      this.smartsocketClient.eventSubject.subscribe(async eventArg => {
        switch(eventArg) {
          case 'disconnected':
            this.disconnect('upstreamEvent');
        }
      });

      // lets define some basic actions

      /**
       * should handle a forced unsubscription by the server
       */
      const socketFunctionUnsubscribe = new plugins.smartsocket.SocketFunction({
        funcName: 'unsubscribe',
        allowedRoles: [],
        funcDef: async (dataArg: interfaces.IServerUnsubscribeActionPayload) => {
          const channel = this.clientUniverseCache.channelMap.find(channelArg => {
            return channelArg.name === dataArg.name;
          });
          if (channel) {
            channel.unsubscribe();
          }
          return {};
        }
      });

      /**
       * handles message reception
       */
      const socketFunctionProcessMessage = new plugins.smartsocket.SocketFunction<
        interfaces.ISocketRequest_ProcessMessage
      >({
        funcName: 'processMessage',
        allowedRoles: [],
        funcDef: async messageDescriptorArg => {
          plugins.smartlog.defaultLogger.log('info', 'Got message from server');
          const clientUniverseMessage = ClientUniverseMessage.createMessageFromMessageDescriptor(
            messageDescriptorArg
          );
          this.messageRxjsSubject.next(clientUniverseMessage);

          // lets find the corresponding channel
          const targetChannel = this.getChannel(clientUniverseMessage.targetChannelName);
          if (targetChannel) {
            await targetChannel.emitMessageLocally(clientUniverseMessage);
            return {
              messageStatus: 'ok'
            };
          } else {
            return {
              messageStatus: 'channel not found'
            };
          }
        }
      });

      // add functions
      this.smartsocketClient.addSocketFunction(socketFunctionUnsubscribe);
      this.smartsocketClient.addSocketFunction(socketFunctionProcessMessage);

      await this.smartsocketClient.connect();
      plugins.smartlog.defaultLogger.log('info', 'universe client connected successfully');
      await this.clientUniverseCache.channelMap.forEach(async clientUniverseChannelArg => {
        await clientUniverseChannelArg.populateSubscriptionToServer();
      });
    }
  }

  public async disconnect(reason: 'upstreamEvent' | 'triggered' = 'triggered', tryReconnect = false) {
    if (reason === 'triggered') {
      const smartsocketToDisconnect = this.smartsocketClient;
      this.smartsocketClient = null; // making sure the upstreamEvent does  not interfere
      await smartsocketToDisconnect.disconnect();
    }
    if (this.options.autoReconnect && reason === 'upstreamEvent' && this.smartsocketClient) {
      await plugins.smartdelay.delayForRandom(5000, 20000);
      this.smartsocketClient = null;
      this.checkConnection();
    }
  }
}