//copied from https://stackoverflow.com/questions/5999118/how-can-i-add-or-update-a-query-string-parameter
export function updateQueryString(
  key: string,
  value?: string | null,
  url?: string
): string {
  if (!url) url = window.location.href;
  const re = new RegExp('([?&])' + key + '=.*?(&|#|$)(.*)', 'gi');
  let hash;

  if (re.test(url)) {
    if (typeof value !== 'undefined' && value !== null) {
      return url.replace(re, '$1' + key + '=' + value + '$2$3');
    } else {
      hash = url.split('#');
      url = hash[0].replace(re, '$1$3').replace(/(&|\?)$/, '');
      if (typeof hash[1] !== 'undefined' && hash[1] !== null) {
        url += '#' + hash[1];
      }
      return url;
    }
  } else {
    if (typeof value !== 'undefined' && value !== null) {
      const separator = url.includes('?') ? '&' : '?';
      hash = url.split('#');
      url = hash[0] + separator + key + '=' + value;
      if (typeof hash[1] !== 'undefined' && hash[1] !== null) {
        url += '#' + hash[1];
      }
      return url;
    } else {
      return url;
    }
  }
}