#!/usr/bin/env node

/**
 * Module dependencies.
 */

const app = require('../app');
const debug = require('debug')('ztncui:server');
const http = require('http');
const https = require('https');
const fs = require('fs');

const options = {
  cert: fs.readFileSync('etc/tls/fullchain.pem'),
  key: fs.readFileSync('etc/tls/privkey.pem')
}

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

const http_port = normalizePort(process.env.HTTP_PORT || '3000');
app.set('http_port', http_port);
const https_port = normalizePort(process.env.HTTPS_PORT || null);
app.set('https_port', https_port);

/**
 * Get interface address on which to listen for HTTPS requests from env.
 */
const https_host = process.env.HTTPS_HOST || null;
app.set('https_host', https_host);

/**
 * Create HTTPS server and listen on localhost only for HTTP and
 * on all network interfaces for HTTPS if HTTPS_PORT is set in env,
 * or on specific interface if HTTPS_HOST is set in env.
 */

app.listen(http_port, 'localhost');
const server = https.createServer(options, app);

if (https_port) {
  if (https_host) {
    console.log('Listening for HTTPS requests on port ' + https_port + ' on address ' + https_host);
  } else {
    console.log('Listening for HTTPS requests on port ' + https_port + ' on all interfaces');
  }
  server.listen(https_port, https_host);
}

server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

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

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

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

  return false;
}

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

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

  const bind = typeof http_port === 'string'
    ? 'Pipe ' + http_port
    : 'Port ' + http_port;

  const sbind = typeof https_port === 'string'
    ? 'Pipe ' + https_port
    : 'Port ' + https_port;

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

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

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