const WebSocket = require('ws')
const config = require('@config/index')
const DB = require('@libs/database')
const {
  msgSplit
} = require('./parser')

class WS {
  constructor () {
    /** @type {WebSocket} */
    this.ws = null
  }

  runBot () {
    if (!config.twitch.chat_host || !config.twitch.bot_oauth) return
    if (this.ws !== null) return
    this.ws = new WebSocket(`wss://${config.twitch.chat_host}:443`, 'irc')

    this.ws.on('open', this.handleOpen.bind(this))

    this.ws.on('message', this.handleMessage.bind(this))

    this.ws.on('error', this.handleError.bind(this))

    this.ws.on('close', this.handleExit.bind(this))
  }

  handleError (err) {
    console.log(err)
    this.ws = null
    this.runBot()
  }
  handleExit (code) {
    this.ws = null
    this.runBot()
  }
  handleMessage (data) {
    // socket message convert to string
    let d = data.toString()
    // split message with \n
    // filter array remove empty element
    // replace \r to empty
    let darr = d.split(/\n/).filter(t => t).map(t => t.replace(/\r$/, ''))

    for (let i in darr) {
      // parse message
      console.log('IRC:::: ', darr[i])
      msgSplit(this.ws, darr[i]).then(() => { /* pass */ })
    }
  }
  async handleOpen () {
    // from pool get db connection
    let db = await DB.connect()

    // login to twitch irc
    this.ws.send('PASS ' + config.twitch.bot_oauth)
    this.ws.send('NICK mtfosbot')
    this.ws.send('CAP REQ :twitch.tv/membership :twitch.tv/commands')

    // 取得要加入的頻道列表
    let text = `select "name" from "public"."twitch_channel where "join" = true`
    let result = await db.query({
      text
    })

    // release pool connection
    await db.replace()

    if (result !== null && result.rowCount > 0) {
      for (let row of result.rows) {
        if ('name' in row) {
          this.ws.send('JOIN #' + row.name)
        }
      }
    }
  }

  joinChannel (channel = null) {
    if (channel === null || typeof channel !== 'string' || channel.trim().length === 0) return null
    this.ws.send(`JOIN #${channel.trim()}`)
  }
}

module.exports = new WS()