import _ from 'lodash';
import { HandlerBase } from '../handler-base';
import { Application } from '../../app';
import { EventEmitter } from 'events';
import { Message, MessageType } from './interfaces';
import { mikudos } from '../../namespace';
import Debug from 'debug';
const debug = Debug('mikudos:pusher');

export class PUSHER_HANDLER extends HandlerBase {
  private pusherRequest?: any;
  private userIdPath: string;
  // !TODO: change default mode
  private syncMode: string;
  private groupId: string;
  constructor(
    public app: Application,
    {
      eventPath = 'pusher',
      userIdPath = 'id',
      syncMode = 'group',
      groupId = 'test-group',
    } = {},
    private pusherService: any,
  ) {
    super(eventPath);
    this.userIdPath = userIdPath;
    this.syncMode = syncMode;
    this.groupId = groupId;
    this.initDuplexRequest();
  }

  register(socket: mikudos.Socket) {
    debug(`register json-rpc service with auth`);
    if (!socket.mikudos?.user?.[this.userIdPath])
      console.error(
        'socket without authenticated user can not register pusher event',
      );
    let channelId = String(socket.mikudos.user[this.userIdPath]);
    socket.on(`${this.eventPath}`, (data: Message) => {
      // check data type
      if (data.messageType !== MessageType.RECEIVED) return;
      data.messageType = MessageType.RECEIVED;
      data.channelId = channelId;
      this.pusherRequest.write(data);
    });
    this.pusherRequest.write({
      channelId: channelId,
      messageType: MessageType.REQUEST,
    });
  }

  initDuplexRequest() {
    debug('init new pusher stream Request');
    this.pusherRequest = this.pusherService.GateStream(
      this.syncMode === 'group'
        ? {
            group: this.groupId,
          }
        : {},
    );
    this.pusherRequest.removeAllListeners();
    this.pusherRequest.on('data', async (data: Message) => {
      debug('new pusher message', data);
      if (!data.channelId) return;
      if (await this.app.isIORoomEmpty(data.channelId)) {
        // 对应组内没有用户
        data.messageType = MessageType.UNRECEIVED;
        this.pusherRequest.write(data);
      } else {
        // 将消息发送给组内用户
        this.app.io.to(data.channelId).emit(`${this.eventPath}`, data);
      }
    });
    this.pusherRequest.on('end', (data: any) => {
      debug('pusher request ended:', data);
      this.initDuplexRequest();
    });
    this.pusherRequest.on('error', (data: any) => {
      debug('pusher request error:', data);
      this.initDuplexRequest();
    });
  }
}