'use strict'

const yargs = require('yargs')
const express = require('express')
const request = require('request')
const uuid = require('node-uuid')
const querystring = require('querystring')
const opener = require('opener')

let argv = require('yargs')
             .option('client_id', {
                alias: 'id',
                type: 'string',
                required: true
             })
             .option('client_secret', {
                alias: 'secret',
                type: 'string',
                required: true
             })
             .option('auth_url', {
                alias: 'auth',
                type: 'string',
                default: 'auth.getmondo.co.uk'
             })
             .option('api_domain', {
                alias: 'api',
                type: 'string',
                default: 'api.getmondo.co.uk'
             })
             .option('state', {
                type: 'string'
             })
             .option('port', {
                alias: 'p',
                type: 'number',
                default: 0
             })
             .option('exit', {
                alias: 'x',
                type: 'boolean',
                default: true
             })
             .argv

const client_id = argv.client_id
const client_secret = argv.client_secret

const auth_url = `https://${argv.auth_url}`
const api_domain = `https://${argv.api_domain}`
const api_token_url = '/oauth2/token'

const app = express()
const server  = require('http').createServer(app)

const exit_immediately = argv.exit
let port = argv.port
let state = argv.state


function getRootAddress(url) {
    url = url || ''
    return `http://localhost:${port}${url}`
}

function getAuthAddress() {
    return getRootAddress('/mondo')
}

app.use('/mondo', (req, res) => {
  if (req.query.state !== state) {
    res.json({
      error: 'State does not match',
      state: state,
      query: req.query
    })
  }
  request({
    uri: `${api_domain}${api_token_url}`,
    method: 'POST',
    json: true,
    form: {
      grant_type: 'authorization_code',
      client_id: client_id,
      client_secret: client_secret,
      redirect_uri: getAuthAddress(),
      code: req.query.code
    }
  }, (err, data) => {
    if (err) {
      res.status(500)
      res.json(err)
    }
    if (data) {
      res.json(data.body)
    }
    if (exit_immediately) {
      process.exit()
    }
  })
})

app.use('/', (req, res) => {
  state = req.query.state || uuid.v4()
  let params = {
    client_id: client_id,
    redirect_uri: getAuthAddress(),
    response_type: 'code',
    state: state
  }
  let qs = querystring.stringify(params)
  res.redirect(`${auth_url}?${qs}`)
})

server.listen(port, function() {
  console.log('Mondo auth process started')
  port = server.address().port
  opener(getRootAddress())
})