/*
 * server.js
 * This file is the core of your bot
 *
 * It creates a little server using express
 * So, your bot can be triggered throught "/" route
 *
 * This file was made for locally testing your bot
 * You can test it by running this command
 * curl -X "POST" "http://localhost:5000" -d '{"text": "YOUR_TEXT"}' -H "Content-Type: application/json; charset=utf-8"
 * You might modify the server port ^^^^  depending on your configuration in config.js file
 */

const express = require('express')
const bodyParser = require('body-parser')

// Load configuration
require('./config')
const bot = require('./bot')

// Start Express server
const app = express()
app.set('port', process.env.PORT || 5000)
app.use(bodyParser.json())

// Handle / route
app.use('/', (request, response) => {
  bot.reply(request, response)
    .then(success => {
      console.log(success)
      if (!response.headersSent) { response.status(200) }
    }).catch(error => {
      console.log('Error in your bot:', error)
      if (!response.headersSent) { response.sendStatus(400) }
    })
})

if (!process.env.REQUEST_TOKEN) {
  console.log('ERROR: process.env.REQUEST_TOKEN variable in src/config.js file is empty ! You must fill this field with the request_token of your bot before launching your bot locally')

  process.exit(0)
} else {
  // Run Express server, on right port
  app.listen(app.get('port'), () => {
    console.log('Our bot is running on port', app.get('port'))
  })
}