let languageSelectorButton = document.getElementById('language-selector-button');
let languageSelector = document.getElementById('language-selector');
let selecting = false;

function addReplaceLangCode(url, langCode) {
    let a = window.location;
    let path = a.pathname.split('/');
    path.shift();
  
    if(path[0].length == 2) {
      path[0] = langCode;
    }else{
      path.unshift(langCode);
    }
    return a.protocol + '//' +
      a.host + '/' + path.join('/') + 
      (a.search != '' ?  a.search : '') + 
      (a.hash != '' ?  a.hash : '');
  }

function update() {
    let langCode = languageSelector.value;
    let url = addReplaceLangCode(window.location.href, langCode);
    window.location = url;
}
languageSelector.addEventListener('click', function() {
    if (selecting) {
        update();
        selecting = false;
    } else {
        selecting = true;
    }
});