/* Sandbar website analytics. Add to a page:
   <script defer src="https://sandbar.example.com/script.js" data-website="WEBSITE_ID"></script>
   It sets no cookies and stores nothing in the browser. It sends the page path, the referrer, the
   language and the browser's own user agent, and it honors Do Not Track.
   Options on the tag: data-hash (count #hash changes as pages), data-auto="false" (send nothing
   until you call sandbar.view() yourself). Custom events: sandbar.track("signup", {plan: "pro"}). */
(function () {
  var tag = document.currentScript;
  if (!tag) return;
  var site = tag.getAttribute('data-website');
  if (!site) return;
  var base = tag.src.replace(/\/script\.js(\?.*)?$/, '');
  var dnt = navigator.doNotTrack === '1' || window.doNotTrack === '1' || navigator.msDoNotTrack === '1';
  var withHash = tag.hasAttribute('data-hash');
  var last = '';
  var first = true;

  function send(body) {
    if (dnt) return;
    body.website = site;
    body.hostname = location.hostname;
    body.language = navigator.language || '';
    var json = JSON.stringify(body);
    // text/plain keeps this a "simple" cross-origin request, so no preflight is needed
    try {
      if (navigator.sendBeacon && navigator.sendBeacon(base + '/api/send', new Blob([json], { type: 'text/plain' }))) return;
    } catch (e) { /* fall through to fetch */ }
    try {
      fetch(base + '/api/send', { method: 'POST', body: json, headers: { 'Content-Type': 'text/plain' }, keepalive: true, mode: 'cors', credentials: 'omit' });
    } catch (e) { /* analytics must never break the page */ }
  }

  function view() {
    var path = location.pathname + (withHash ? location.hash : '');
    if (path === last) return;
    last = path;
    send({ path: path, referrer: first ? document.referrer : '' });
    first = false;
  }

  function hook(name) {
    var orig = history[name];
    if (!orig) return;
    history[name] = function () {
      var r = orig.apply(this, arguments);
      setTimeout(view, 0);
      return r;
    };
  }
  hook('pushState');
  hook('replaceState');
  window.addEventListener('popstate', function () { setTimeout(view, 0); });
  if (withHash) window.addEventListener('hashchange', function () { setTimeout(view, 0); });

  window.sandbar = {
    view: view,
    track: function (name, data) {
      if (!name) return;
      send({ path: location.pathname, event: String(name).slice(0, 80), data: data });
    }
  };

  if (tag.getAttribute('data-auto') === 'false') return;
  if (document.readyState === 'complete') view();
  else window.addEventListener('load', view);
})();