import { Socket } from 'net'
import btc from 'better-try-catch'

export default class Consumer extends Socket {
  constructor (path, opts={}) {
    super()
    this.path = path
    this.keepAlive = opts.keepAlive ? opts.keepAlive : true
    this._ready = false
  }

  ready() {return this._ready}

  async connect (app) {

    await this.listen(app)
    console.log('consumer: listening')

    await super.connect({ path: this.path })
    console.log(`consumer: connected to ${this.path}`)
    this.setKeepAlive(this.keepAlive)

    this.on('error', (error) => {
      'client socket error \n ', error.code
    })

    return await isReady(this.ready.bind(this))

  }

  async send(packet) {
    let [err, strbuf] = btc(JSON.stringify)(packet)
    if (!err) {
      // await promisify(this.write)(strbuf)
      console.log('attempting to send')
      // console.log(await this.write(strbuf))
      let res = await new Promise((resolve, reject) => { //returning promise
        this.write(strbuf, (err) => {
          if (err) reject(err)
          else resolve('complete')
        })
      })
      console.log('send is', res)
    }
    else { console.log(`bad packet JSON syntax \n ${packet} \n${err}`)}
  }

  async listen (app) {
    this.on('data', async (buf) => {
      let [err, packet] = btc(JSON.parse)(buf.toString())
      if (!err) {
        if (packet.ready) {
          this._ready = true
          return }
        // set default packet processing - simple print to console of packet
        app.ucpp = app.ucpp || 'processPacket'
        if (!app[app.ucpp]) {
          app.ucpp = 'processPacket'
          app.processPacket =  async (packet) => {
            console.log('incoming packet from socket')
            console.dir(packet)
            return packet }
        }
        app[app.ucpp](packet) // process the packet
      }
      else { console.log(`bad packet JSON syntax \n ${buf.toString()}`)}
    })
  }

}  // end class

// wait for handshake from socket
function isReady(ready) {
  let time = 0
  return new Promise(function (resolve, reject) {
    (function waitReady(){
      if (time > 3000) return reject('timeout')
      if (ready()) return resolve('ready')
      console.log('waiting for 30ms')
      time += 30
      setTimeout(waitReady, 30)
    })()
  })
}