#!/usr/bin/env node

// Module dependencies.
const debug = require('debug')('cenos:server');
const http = require('http');
const localtunnel = require('localtunnel');

// App dependencies.
const app = require('../app');
const config = require('../config');
const db = require('../db');

// Store port in Express.
app.set('port', config.port);

// Print info.
let date = (new Date()).toISOString();
console.info(`${date.substr(0, 10)} ${date.substr(11, 8)} Starting app in mode "${config.mode}" on port ${config.port}`);

// Create HTTP server.
let server = http.createServer(app);
server.on('error', onError);
server.on('listening', onListening);

// Listen on provided port, on all network interfaces.
server.listen(config.port);

/**
 * Event listener for HTTP server "error" event.
 */
function onError(error) {
  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() {
  let addr = server.address();
  let bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);

  if (config.mode === config.MODE_DEV) {
    startPublicTunnel(addr.port);
  }
}

/**
 * Start public tunnel for development purposes.
 */
async function startPublicTunnel(port) {
  console.log('Requesting public tunnel...');

  const tunnel = await localtunnel({
    port: port,
    subdomain: 'cenos-dev-server',
  });

  console.log('Public tunnel url: ' + tunnel.url);
}

module.exports = app;