const Router = require('koa-router')
const r = new Router()
const config = require('../config')
const qs = require('querystring')
const request = require('request')

r.get('/', async (c, n) => {
  await c.render('index')
})

r.get('/chat_login', async (c, n) => {
  let url = config.twitch.auth_url

  let qsObj = {
    client_id: config.twitch.client_id,
    redirect_uri: config.twitch.redirect_uri,
    response_type: 'code',
    scope: 'chat_login'
  }
  let qsStr = qs.stringify(qsObj)
  let toUrl = `${url}?${qsStr}`

  c.redirect(toUrl)
})

r.get('/login', async (c, n) => {
  let url = config.twitch.auth_url

  let qsObj = {
    client_id: config.twitch.client_id,
    redirect_uri: config.twitch.redirect_uri,
    response_type: 'code',
    scope: 'user_read'
  }
  let qsStr = qs.stringify(qsObj)
  let toUrl = `${url}?${qsStr}`

  c.redirect(toUrl)
})

r.get('/twitch/oauth', async (c, n) => {
  let code = c.query.code || ''
  if (!code) {
    await c.render('test', {
      data: {
        msg: 'code not found'
      }
    })
    return
  }

  let url = config.twitch.token_url
  let qsObj = {
    client_id: config.twitch.client_id,
    client_secret: config.twitch.secret,
    code,
    grant_type: 'authorization_code',
    redirect_uri: config.twitch.redirect_uri
  }
  let qsStr = qs.stringify(qsObj)
  let toUrl = `${url}?${qsStr}`

  let body = await new Promise((resolve, reject) => {
    request.post(toUrl, (err, res, body) => {
      if (err) {
        reject(err)
        return
      }
      try {
        resolve(JSON.parse(body))
      } catch (err) {
        resolve(body)
      }
    })
  })

  let opts = {
    url: 'https://api.twitch.tv/kraken/user',
    headers: {
      'Client-ID': config.twitch.client_id,
      'Authorization': 'OAuth ' + body.access_token
    },
    method: 'get'
  }

  let userProfile = await new Promise((resolve) => {
    request(opts, (err, res, body) => {
      console.log('get profile', body)
      if (err) {
        resolve(null)
        return
      }
      try {
        body = JSON.parse(body)
      }catch (err){}
      resolve(body)
    })
  })

  await c.render('test', { data: { body, userProfile } })
})

module.exports = r