'use strict';

const { Server } = require('socket.io');
const is = require('is-type-of');
const Log = require('../log');
const Conf = require('../config/cache');
const Ps = require('../ps');
const Channel = require('../const/channel');

/**
 * socket server
 */
class SocketServer {
  constructor (app) {
    this.app = app;
    this.socket = undefined;
    const options = Conf.getValue('socketServer');

    if (options.enable == false) {
      return;
    }

    let port = Ps.getSocketPort();
    if (!port) {
      throw new Error('[ee-core] [socket/socketServer] socekt port required, and must be a number !');
    }

    Log.coreLogger.info('[ee-core] [socket/socketServer] port is:', port);

    this.io = new Server(port, options);
    this.connec(options);
  }

  connec (opt = {}) {
    const app = this.app;
    this.io.on('connection', (socket) => {
      const channel = opt.channel || Channel.socketIo.partySoftware;
      this.socket = socket;
      socket.on(channel, async (message, callback) => {
        Log.coreLogger.info('[ee-core] [socket/socketServer] socket id:' + socket.id + ' message cmd: ' + message.cmd);

        try {
          // 找函数
          const cmd = message.cmd;
          const args = message.args || message.params;
          let fn = null;
          if (is.string(cmd)) {
            const actions = cmd.split('.');
            let obj = app;
            actions.forEach(key => {
              obj = obj[key];
              if (!obj) throw new Error(`class or function '${key}' not exists`);
            });
            fn = obj;
          }
          if (!fn) throw new Error('function not exists');

          const result = await fn.call(app, args);
          if (callback) {
            callback(result);
          }
        } catch (err) {
          Log.coreLogger.error('[ee-core] [socket/socketServer] throw error:', err);
        }
      });
    });
  }
}

module.exports = SocketServer;