let app = require('../app')
let debug = require('debug')('sw-fest-api:server')
let http = require('http')

let port = normalizePort(process.env.PORT || '3000')
app.set('port', port)

let server = http.createServer(app)

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

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

  if (isNaN(port)) {
    return val
  }

  if (port >= 0) {
    return port
  }

  return false
}

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

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

  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges')
      process.exitCode = 1
      break
    case 'EADDRINUSE':
      console.error(bind + ' is already in use')
      process.exitCode = 1
      break
    default:
      throw error
  }
}

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