(function () {
  'use strict';

  var script = document.currentScript || (function () {
    var scripts = document.getElementsByTagName('script');
    return scripts[scripts.length - 1];
  }());
  var appId = script && script.getAttribute('data-app') || 'O01St67R';
  var siteName = script && script.getAttribute('data-site') || '';
  var endpoint = script && script.getAttribute('data-endpoint') || new URL('api/collect.php', script && script.src || window.location.href).href;
  var startedAt = Date.now();
  var lastReportedStay = 0;

  function uuid() {
    if (window.crypto && crypto.randomUUID) {
      return crypto.randomUUID();
    }
    return String(Date.now()) + '-' + Math.random().toString(16).slice(2);
  }

  function storageValue(key, fallbackFactory) {
    try {
      var value = localStorage.getItem(key);
      if (!value) {
        value = fallbackFactory();
        localStorage.setItem(key, value);
      }
      return value;
    } catch (error) {
      return fallbackFactory();
    }
  }

  function sessionValue(key, fallbackFactory) {
    try {
      var value = sessionStorage.getItem(key);
      if (!value) {
        value = fallbackFactory();
        sessionStorage.setItem(key, value);
      }
      return value;
    } catch (error) {
      return fallbackFactory();
    }
  }

  function channelId(url) {
    var text = String(url || '');
    var compositePathMatch = text.match(/(?:^|\/)(\d+_[a-f0-9]{16,64})(?=\/|$|\?|#)/i);
    var compositeLooseMatch = text.match(/(?:^|[^a-z0-9_])(\d+_[a-f0-9]{16,64})(?=$|[^a-z0-9_])/i);
    var pathMatch = text.match(/(?:^|\/)([a-f0-9]{32})(?=\/|$|\?|#)/i);
    var looseMatch = text.match(/[a-f0-9]{32}/i);
    return (compositePathMatch ? compositePathMatch[1] : (compositeLooseMatch ? compositeLooseMatch[1] : (pathMatch ? pathMatch[1] : (looseMatch ? looseMatch[0] : '')))).toLowerCase();
  }

  function payload(type, extra) {
    var data = {
      app: appId,
      eventId: uuid(),
      site: siteName,
      type: type,
      url: location.href,
      title: document.title || '',
      referrer: document.referrer || '',
      channel: channelId(location.href),
      visitorId: storageValue('simple_stats_visitor_id', uuid),
      sessionId: sessionValue('simple_stats_session_id', uuid),
      screen: [screen.width, screen.height, window.devicePixelRatio || 1].join('x'),
      language: navigator.language || ''
    };

    for (var key in extra || {}) {
      if (Object.prototype.hasOwnProperty.call(extra, key)) {
        data[key] = extra[key];
      }
    }
    return data;
  }

  function send(data, useBeacon) {
    var body = JSON.stringify(data);
    if (useBeacon && navigator.sendBeacon) {
      try {
        var blob = new Blob([body], { type: 'text/plain;charset=UTF-8' });
        if (navigator.sendBeacon(endpoint, blob)) {
          return;
        }
      } catch (error) {}
    }

    try {
      fetch(endpoint, {
        method: 'POST',
        mode: 'cors',
        credentials: 'omit',
        keepalive: !!useBeacon,
        headers: { 'Content-Type': 'text/plain;charset=UTF-8' },
        body: body
      }).catch(function () {});
    } catch (error) {
      var image = new Image();
      image.src = endpoint + '?' + new URLSearchParams(data).toString();
    }
  }

  function elapsedSeconds() {
    return Math.max(1, Math.round((Date.now() - startedAt) / 1000));
  }

  function sendStay(useBeacon) {
    var seconds = elapsedSeconds();
    if (seconds <= lastReportedStay) {
      return;
    }
    lastReportedStay = seconds;
    send(payload('stay', {
      staySeconds: seconds
    }), !!useBeacon);
  }

  function startStayHeartbeat() {
    window.setTimeout(function () {
      sendStay(false);
    }, 1000);

    window.setInterval(function () {
      if (!document.hidden) {
        sendStay(false);
      }
    }, 5000);
  }

  send(payload('pageview'), false);
  startStayHeartbeat();
  document.addEventListener('visibilitychange', function () {
    if (document.visibilityState === 'hidden') {
      sendStay(true);
    }
  });
  window.addEventListener('pagehide', function () {
    sendStay(true);
  });
  window.addEventListener('beforeunload', function () {
    sendStay(true);
  });
}());