// Import Modules
import express from 'express'; // Express framework
import dotenv from 'dotenv'; //Dotenv library
import '@babel/polyfill'; // Regenator runtime
import log from './logger'; // Custom logger
import db from './db'; // Custom database
import routes from './routes'; // Routes file
import {
  ALLOW_ORIGIN,
  ALLOW,
  ALLOW_HEADERS,
  ALLOW_METHODS,
  ALLOW_WILDCARD,
  REST_HEADERS_OPTIONS,
  REST_METHODS,
} from './constants'; // Request headers

// Load env vars
dotenv.config();

// import Exprees
const app = express();
// import Body-parser
const bodyParser = require('body-parser');

// Get the application PORT from our env var
const {
  PORT,
} = process.env;

// Define the elements that will use our middleware

// Define request headers, this will avoid CORS missconfiguration
app.use((req, res, next) => {
  res.header(ALLOW_ORIGIN, ALLOW_WILDCARD);
  res.header(ALLOW_HEADERS, REST_HEADERS_OPTIONS);
  res.header(ALLOW_METHODS, REST_METHODS);
  res.header(ALLOW, REST_METHODS);
  next();
});
// Avoid nested objects
app.use(bodyParser.urlencoded({ extended: false }));
// Read only JSON requests
app.use(bodyParser.json());
// Our API routes
app.use(routes);

// Our application will start in the defined port
app.listen(PORT, () => {
  // Connect to database
  db();
  // Log that the application is running
  log(`Node app is running on port ${PORT}`);
});

// Export our API
export default { app };