const dbPool = require('./database')
const config = require('../config')
/**
 * @param {WebSocket} ws
 * @param {string} msg
 */
const msgSplit = async function (ws, msg) {
  if (!msg || typeof msg !== 'string') return null
  let txtarr = msg.split(' ')

  if (txtarr.length > 2) {
    // server heartbeat message
    if (/^ping$/i.test(txtarr[0])) {
      // reply server heartbeat
      ws.send(`PONG ${txtarr[1]}`)
      return
    }
    // chat message
    if (/^privmsg$/i.test(txtarr[1])) {
      // message format
      // :user!user@user.tmi.twitch.tv PRIVMSG #channel :message
      let user = txtarr[0].split('!')[0].substr(1)
      if (user === config.twitch.bot_account) return
      let channel = txtarr[2]

      // get message
      txtarr = txtarr.slice(3, txtarr.length)
      // remove message first :
      let m = txtarr.join(' ').substr(1)

      let result = await parseCMD(user, channel, m)
      if (result && typeof result === 'string') {
        ws.send(`PRIVMSG ${channel} :${result}`)
      }
    }
  }
}

/**
 *
 * @param {string} user
 * @param {string} channel
 * @param {string} msg
 */
const parseCMD = async function (user, channel, msg) {
  let db = await dbPool.connect()
  let m = null
  try {
    let txt = msg.trim().split(' ')
    // get channel name without hashtag
    let ch = channel[0] === '#' ? channel.substr(1) : channel
    if (txt.length < 1) {
      await db.end()
      return null
    }
    // add cmd
    if (/^!\+/.test(txt[0])) {
      let cmd = txt[0].substr(2)
      let tmpmsg = txt.slice(1, txt.length).join(' ')
      let query = `insert into "public"."commands" ("command", "channel", "message") values
        ($1, $2, $3) 
        on conflict ("command", "channel") do update set 
          "message" = $3, 
          "active" = true,
          "mtime" = now()`
      let param = [cmd, ch, tmpmsg]
      await db.query(query, param)
      m = `command "${cmd}" has added`
      // remove cmd
    } else if (/^!-/.test(txt[0])) {
      let cmd = txt[0].substr(2)
      let query = `update "public"."commands" set "active" = $1, "mtime" = now() where "command" = $2 and "channel" = $3`
      let param = [false, cmd, ch]
      await db.query(query, param)
      m = `command "${cmd}" has removed`
      // run cmd
    } else if (/^!/.test(txt[0])) {
      let cmd = txt[0].substr(1)
      let query = `select "message", "command" from "public"."commands" where "command" = $1 and "channel" = $2 and "active" = $3 limit 1`
      let param = [cmd, ch, true]
      let result = await db.query(query, param)
      if (result === null || result.rows.length === 0) return null
      m = result.rows[0].message
    }
  } catch (err) {
    console.error(err)
  } finally {
    await db.end()
  }

  return m
}

module.exports = {
  msgSplit
}