const Router = require('koa-router')
const r = new Router()
// const koaBody = require('koa-body')
const rawBody = require('raw-body')
const {
  verifyLine
} = require('../../libs/middleware')
const {
  textMessage
} = require('../../libs/line-message')

const getRaw = async (c, n) => {
  let raw = await rawBody(c.req, {
    length: c.request.length,
    limit: '5mb',
    encoding: c.request.charset
  })
  c.request.raw = raw
  let txt = raw instanceof Buffer ? raw.toString() : raw
  if (c.request.type === 'application/json') {
    try {
      c.request.body = JSON.parse(txt)
    } catch (err) {
      c.request.body = txt
    }
  }
  return n()
}

r.post('/', getRaw, verifyLine, async (c, n) => {
  console.log(JSON.stringify(c.request.body, null, 2))
  if (!('events' in c.request.body)) return c.throw(400, 'data struct error')
  let evt = c.request.body.events || []
  evt.forEach(t => {
    let type = t.type
    switch (type) {
      case 'message':
        textMessage(t).catch(err => {
          console.log(err)
        })
        break
    }
  })
  c.body = 'success'
  c.status = 200
})

module.exports = r