const commands = require('./commands')
const DB = require('@libs/database')
const api = require('@libs/api-action')

/**
 * parse text message object
 * @param {object} evt line message event object
 */
const textMessage = async (evt) => {
  let {replyToken, source, message, type} = evt
  if (type === 'leave' && 'groupId' in source && 'type' in source && source.type === 'group') {
    try {
      await leaveGroup(source.groupId)
    } catch (err) {
      console.log(err)
    }
    return
  }
  if (!source || !('type' in source) || source.type !== 'group') return
  if (!message || message.type !== 'text') return
  let {text} = message
  if (typeof text !== 'string') return
  text = text.trim()
  if (text.length === 0) return

  saveToLog(source, text).then(() => {}).catch(err => {
    console.log(err)
  })

  let result = await commands(text, source)
  if (result === null) return
  if (typeof result === 'object' && 'reply' in result) {
    console.log('reply message :::: ', result.reply)
    await api.line.replyMessage(replyToken, result.reply)
  }
}

const saveToLog = async (source, text = '') => {
  if (!source || typeof source !== 'object') return null
  if (typeof text !== 'string' || text.length === 0) return null
  let {groupId, userId} = source
  if (typeof groupId !== 'string' || groupId.length === 0) return null
  if (typeof userId !== 'string' || userId.length === 0) return null
  // connect database
  let db = await DB.connect()

  try {
    let text = `select * from "public"."line_user" where "id" = $1`
    let values = [userId]
    let user = await db.query({text, values})
    let data = null
    if (user.rowCount === 0) {
      data = api.line.getUserInfo(groupId, userId)
      if (data === null) {
        db.release()
        return null
      }
      let text = `insert into "public"."line_user" ("id", "name") values ($1, $2)`
      let values = [userId, data.displayName]
      await db.query({text, values})
    }
    text = `insert into "public"."line_message_log" ("group", "user", "message") values ($1, $2, $3)`
    values = [groupId, userId, text]
    await db.query({text, values})
  } catch (err) {
    console.log('save log error :::: ', err)
  }

  db.release()
  return null
}

const leaveGroup = async (group = '') => {
  if (typeof group !== 'string' || group.trim().length === 0) return
  let db = await DB.connect()
  let gData = await db.query({
    text: `select * from "public"."line_group" where "id" = $1`,
    values: [group]
  })
  if (gData.rowCount === 0) {
    db.release()
    return
  }
  try {
    await db.query({
      text: `delete from "public"."commands" where "group" = $1`,
      values: [group]
    })
    await db.query({
      text: `delete from "public"."key_commands" where "group" = $1`,
      values: [group]
    })
    await db.query({
      text: `delete from "public"."line_fb_rt" where "line" = $1`,
      values: [group]
    })
    await db.query({
      text: `delete from "public"."line_twitch_rt" where "line" = $1`,
      values: [group]
    })
    await db.query({
      text: `delete from "public"."line_youtube_rt" where "line" = $1`,
      values: [group]
    })
    await db.query({
      text: `delete from "public"."twitch_channel" where "id" in (
        select ch."id" from "public"."twitch_channel" ch 
        left join "line_twitch_rt" rt
        on rt."twitch" = ch."id"
        where rt."twitch" is null
      )`
    })
    await db.query({
      text: `delete from "public"."facebook_page" where "id" in (
        select ch."id" from "public"."facebook_page" ch 
        left join "line_fb_rt" rt
        on rt."twitch" = ch."id"
        where rt."twitch" is null
      )`
    })
    await db.query({
      text: `delete from "public"."youtube_channel" where "id" in (
        select ch."id" from "public"."youtube_channel" ch 
        left join "line_youtube_rt" rt
        on rt."twitch" = ch."id"
        where rt."twitch" is null
      )`
    })
    await db.query({
      text: `delete from "public"."line_group" where "id" = $1`,
      values: [group]
    })
  } catch (err) {
    console.log(err)
  }
  db.release()
}

module.exports = {
  textMessage
}