$(document).ready( ->

  $('#nav-toggle').on('click', toggleNav)
  if getCookie('navCollapsed') == 'true'
    $('body').addClass('collapsed')

)

toggleNav = () ->
  bodyElem = $('body')
  if bodyElem.hasClass('collapsed')
    bodyElem.removeClass('collapsed')
    setCookie('navCollapsed', 'false')
  else
    bodyElem.addClass('collapsed')
    setCookie('navCollapsed', 'true')

getCookie = (cName) ->
  name = cName + '='
  cDecoded = decodeURIComponent(document.cookie)
  #to be careful
  cArr = cDecoded.split('; ')
  res = undefined
  cArr.forEach (val) ->
    if val.indexOf(name) == 0
      res = val.substring(name.length)
    return
  res

setCookie = (cName, cValue, expDays = 30) ->
  date = new Date
  date.setTime date.getTime() + expDays * 24 * 60 * 60 * 1000
  expires = 'expires=' + date.toUTCString()
  document.cookie = cName + '=' + cValue + '; ' + expires + '; path=/'
  return