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#!/usr/bin/env node

/*

Surakarta-Online: Realtime game hosting of Surakarta using Node.js
Copyright (C) 2018-2022 CrabAss

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/

/**
 * Module dependencies.
 */

const app = require('../app')
const debug = require('debug')('Surakarta-Online:server')
const http = require('http')

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

const port = normalizePort(process.env.PORT || '2100')
app.set('port', port)
app.disable('x-powered-by')

/**
 * Create HTTP server.
 */

const server = http.createServer(app)

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

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

const io = require('socket.io')(server, { path: '/g/socket' })
const socketHandler = require('../socketHandler')(io, app, err => onError(err))

/**
 * 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 server "error" event.
 */

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

  const 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)
    case 'EADDRINUSE':
      console.error(bind + ' is already in use')
      process.exit(1)
    default:
      throw error
  }
}

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

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

module.exports = server