/**
 * Ws server side
 * Hot reload from preload script during development
 */
import WebSocket from 'ws'
import chalk from 'chalk'
import pkg from '../package.json'


export interface CreateWsServerOptions { }

export interface WssServer {
  wss: WebSocket.Server
  instance: WebSocket | null
}

const TAG = '[ws.ts]'

export function createWsServer(options: CreateWsServerOptions = {}): WssServer {
  const port = pkg.env.PORT_WS
  const host = pkg.env.HOST // '127.0.0.1'
  const wss = new WebSocket.Server({ host, port })
  const wssInstance: WssServer = { wss, instance: null }

  console.log(TAG, 'Wss run at - ' + chalk.yellow(`ws://${host}:${port}`))

  wss.on('connection', ws => {
    console.log(TAG, chalk.yellow(`wss.on('connection')`))

    wssInstance.instance = ws
    ws.on('message', message => {
      console.log(TAG, `ws.on('message'):`, message.toString())
    })

    ws.send(formatWsSendData({ cmd: 'message', data: 'connected.' }))
  })

  wss.on('close', () => {
    console.log(TAG, chalk.gray(`wss.on('close')`))

    wssInstance.instance = null
  })

  return wssInstance
}

export function formatWsSendData(json: { cmd: string, data?: any }) {
  return JSON.stringify(json)
}