/**
 * add group to database
 * @param {string} txt command body format => groupName notifyEnable(0,1)
 * @param {object} source
 * @param {object} db
 */
const addGroup = async (txt, source = {}, db) => {
  if (!db) return null
  if (!('type' in source) || !('groupId' in source) || !('userId' in source)) return null
  let {groupId, userId} = source
  let arr = txt.split(' ')
  if (arr.length < 2 || !isFinite(arr[1])) return null
  let name = arr[0]
  let notify = arr[1]
  if (typeof notify === 'string') notify = parseInt(notify)
  if (notify !== 0 && notify !== 1) return null
  let text = `select "id" from "public"."line_group" where "id" = $1`
  let values = [groupId]
  let result = await db.query({
    text,
    values
  })
  if (result.rowCount > 0) {
    let reply = 'group exists'
    return { reply }
  }
  text = `insert into "public"."line_group" ("id", "name", "notify", "owner", "ctime", "mtime") values ($1, $2, $3, $4, now(), now())`
  values = [groupId, name, (notify === 1), userId]
  await db.query({
    text,
    values
  })
  let reply = 'add success'
  return { reply }
}

/**
 * add facebook page notify to group
 * @param {string} txt command body format => pageid tmpl
 * @param {object} source
 * @param {object} db
 */
const addPage = async (txt, source = {}, db) => {
  if (!db) return null
  if (!('type' in source) || !('groupId' in source) || !('userId' in source)) return null
  let {groupId, userId} = source
  let arr = txt.split(' ')
  if (arr.length < 3) return null
  let page = arr[0]
  let tmpl = arr.slice(1).join(' ')
  let text = `select "id","owner" from "public"."line_group" where "id" = $1`
  let values = [groupId]
  let result = await db.query({
    text,
    values
  })
  if (result.rowCount === 0) {
    let reply = 'group not register'
    return { reply }
  }
  if (result.rows[0].owner !== userId) {
    let reply = 'not owner'
    return { reply }
  }
  // check page exists
  text = `select "id" from "public"."facebook_page" where "id"=$1`
  values = [page]
  let fb = await db.query({
    text,
    values
  })
  // if no page data insert page data and insert rt
  if (fb.rowCount === 0) {
    text = `insert into "public"."facebook_page" ("id", "lastpost", "ctime", "mtime") values 
      ($1, '', now(), now())`
    values = [page]
    await db.query({
      text,
      values
    })
    text = `insert into "public"."line_fb_rt" ("line", "facebook", "tmpl") values ($1, $2, $3)`
    values = [groupId, page, tmpl]
    await db.query({
      text,
      values
    })
  } else {
    // check rt exists
    text = `select rt.* from "public"."line_fb_rt" rt 
      left join "public"."line_group" line
      on line."id" = rt."line"
      left join "public"."facebook_page" fb
      on fb."id" = rt."facebook"
      where 
      fb."id" = $1
      and line."id" = $2`
    values = [page, groupId]
    let rt = await db.query({
      text,
      values
    })
    if (rt.rowCount === 0) {
      text = `insert into "public"."line_fb_rt" ("line", "facebook", "tmpl") values ($1, $2, $3)`
      values = [groupId, page, tmpl]
      await db.query({
        text,
        values
      })
    }
  }

  let reply = 'add page success'
  return { reply }
}

module.exports = {
  addgroup: addGroup,
  addpage: addPage
}