////////////////////////////////////////////////////////////////////////////////
///////////////// Preferred Client Library programming language  ///////////////
////////////////////////////////////////////////////////////////////////////////

function getVisitedApiLib () {
  const path = window.location.pathname.match(
    /client-libraries\/((?:v[0-9]|flight)\/)?([a-zA-Z0-9]*)/
  );
  return path && path.length && path[2];
}

function isApiLib () {
  return /\/client-libraries\//.test(window.location.pathname);
}

// Set the user's programming language (client library) preference.
function setApiLibPreference (preference) {
  setPreference('api_lib', preference);
}

// Retrieve the user's programming language (client library) preference.
function getApiLibPreference () {
  return getPreference('api_lib') || '';
}

// When visit a client library page, set the api_lib preference
if (isApiLib()) {
  var selectedApiLib = getVisitedApiLib();
  setPreference('api_lib', selectedApiLib);
}

// Activate code-tabs based on the cookie then override with query param.
var tab = getApiLibPreference();
['.tabs, .code-tabs'].forEach(
  selector => activateTabs(selector, tab),
  updateBtnURLs(tab)
);