#!/usr/bin/env node

/**
 * Module dependencies.
 */

const appInit = require('../app');
const debug = require('debug')('whooshy:server');
const http = require('http');
const yaml = require('js-yaml');
const fsx = require('fs-extra');

let settings = {};

try {
  settings = yaml.safeLoad(fsx.readFileSync('default-config.yaml'));

  if (fsx.existsSync('config.yaml'))
    Object.assign(settings, yaml.safeLoad(fsx.readFileSync('config.yaml')));
} catch (err) {
  console.error(err);
}

/**
 * Get port from environment and store in Express.
 */

let port = normalizePort(process.env.PORT || settings.port || '3000');

appInit().then((app) => {
  app.set('port', port);

  /**
   * Create HTTP server.
   */

  let server = http.createServer(app);

  /**
   * Listen on provided port, on all network interfaces.
   */

  server.listen(port);
  server.on('error', (error) => onError(error, server));
  server.on('listening', () => onListening(server));

  /**
   * Normalize a port into a number, string, or false.
   */
}).catch((err) => {
  console.error(err.message);
  console.error(err.stack);
});

function normalizePort(val) {
  let port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error, server) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  let bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening(server) {
  let addr = server.address();
  let bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}