import * as ioclient from 'socket.io-client'

export type SocketClient = SocketIOClient.Socket & { onJson(eventName: string): Promise<any> }

export namespace SocketioClient {
  export function connect(url: string, opts = {}): SocketClient {
    console.info(`» SocketIO Client is used "${url}"`)
    const socket = ioclient.connect(url, Object.assign({ transports: ['websocket'] }, opts))
    socket.onJson = (eventName: string) => {
      return new Promise((resolve, reject) => {
        socket.on(eventName, (msg) => {
          try {
            resolve(msg ? JSON.parse(msg) : null)
          } catch (e) {
            reject(e)
          }
        })
      })
    }
    return socket
  }
}