const Koa = require('koa')
const Router = require('koa-router')
const koaLogger = require('koa-logger')
const fbparser = require('./facebook-parser')

const verifyKey = process.env.API_KEY || 'mtfos'

const app = new Koa()
const server = app.listen(3000, () => {
  console.log(`server start on port ${server.address().port}`)
})

const rootRouter = new Router()

app.use(koaLogger())
app.use(rootRouter.allowedMethods())
app.use(rootRouter.routes())

rootRouter.get('/getpost', async (c, n) => {
  let key = c.get('x-mtfos-key')
  if (key !== verifyKey) c.throw(403, 'verify key not match')
  let fbid = c.query.fbpage || ''
  if (typeof fbid !== 'string' || fbid.trim().length === 0) c.throw(400, 'facebook page id format error')
  fbid = decodeURIComponent(fbid.trim())

  let postData = await fbparser.getLastPost(fbid)

  let resData = {}
  if (postData !== null) {
    resData.page = fbid
    resData.postid = postData.id
    resData.text = postData.txt
    resData.time = parseInt(postData.time)
    resData.link = postData.link
  }

  postData = null

  c.body = {
    post: resData
  }
})

module.exports = server