(function () {
  "use strict";

  var script = document.currentScript;
  var siteId = script && script.getAttribute("data-site-id");
  if (!siteId) return;

  var endpoint = "https://ya-stats.ru/api/pixel/event";
  var visitorKey = "ys_pixel_visitor_" + siteId;
  var sessionKey = "ys_pixel_session_" + siteId;
  var sessionTimeout = 30 * 60 * 1000;
  var lastPage = "";

  function id(prefix) {
    if (window.crypto && typeof window.crypto.randomUUID === "function") return window.crypto.randomUUID();
    return prefix + Math.random().toString(36).slice(2) + Date.now().toString(36);
  }

  function storageGet(storage, key) {
    try { return storage.getItem(key); } catch (_) { return null; }
  }

  function storageSet(storage, key, value) {
    try { storage.setItem(key, value); } catch (_) {}
  }

  var visitorId = storageGet(window.localStorage, visitorKey) || id("v_");
  storageSet(window.localStorage, visitorKey, visitorId);
  var now = Date.now();
  var savedSession = null;
  try { savedSession = JSON.parse(storageGet(window.sessionStorage, sessionKey) || "null"); } catch (_) {}
  var newSession = !savedSession || !savedSession.id || now - Number(savedSession.last || 0) > sessionTimeout;
  var sessionId = newSession ? id("s_") : savedSession.id;
  var sessionStartedAt = newSession ? now : Number(savedSession.started || now);
  storageSet(window.sessionStorage, sessionKey, JSON.stringify({ id: sessionId, last: now, started: sessionStartedAt }));

  function queryValue(name) {
    return new URLSearchParams(window.location.search).get(name) || "";
  }

  function queryTerm() {
    return queryValue("utm_term") || queryValue("keyword") || queryValue("text") || queryValue("q");
  }

  function deviceType() {
    var width = window.innerWidth || 1024;
    return width < 768 ? "mobile" : width < 1100 ? "tablet" : "desktop";
  }

  function browserName() {
    var ua = navigator.userAgent || "";
    if (/Edg\//.test(ua)) return "Edge";
    if (/YaBrowser/.test(ua)) return "Yandex";
    if (/Chrome\//.test(ua)) return "Chrome";
    if (/Firefox\//.test(ua)) return "Firefox";
    if (/Safari\//.test(ua)) return "Safari";
    return "Other";
  }

  function osName() {
    var ua = navigator.userAgent || "";
    if (/Android/.test(ua)) return "Android";
    if (/iPhone|iPad|iPod/.test(ua)) return "iOS";
    if (/Windows/.test(ua)) return "Windows";
    if (/Mac OS/.test(ua)) return "macOS";
    if (/Linux/.test(ua)) return "Linux";
    return "Other";
  }

  function send(eventName, metadata) {
    if (!eventName || eventName.length > 80) return;
    var url = window.location.href.slice(0, 2000);
    var payload = {
      event_id: id("e_"), site_id: siteId, visitor_id: visitorId, session_id: sessionId,
      event_name: String(eventName).slice(0, 80), page_url: url, pathname: window.location.pathname,
      referrer: document.referrer || "", utm_source: queryValue("utm_source"),
      utm_medium: queryValue("utm_medium"), utm_campaign: queryValue("utm_campaign"),
      utm_content: queryValue("utm_content"), utm_term: queryTerm(),
      device_type: deviceType(), browser: browserName(), os: osName(), metadata: metadata || {}
    };
    storageSet(window.sessionStorage, sessionKey, JSON.stringify({ id: sessionId, last: Date.now(), started: sessionStartedAt }));
    var serialized = JSON.stringify(payload);
    try {
      if (navigator.sendBeacon) {
        // text/plain keeps the beacon a simple cross-origin request and avoids a CORS preflight.
        var blob = new Blob([serialized], { type: "text/plain;charset=UTF-8" });
        if (navigator.sendBeacon(endpoint, blob)) return;
      }
    } catch (_) {}
    try {
      fetch(endpoint, { method: "POST", headers: { "Content-Type": "text/plain;charset=UTF-8" }, body: serialized, keepalive: true });
    } catch (_) {}
  }

  function pageView() {
    var current = window.location.href;
    if (current === lastPage) return;
    lastPage = current;
    send("page_view");
  }

  if (newSession) send("session_start");
  send("page_view");
  lastPage = window.location.href;

  function sendHeartbeat() {
    send("session_heartbeat", { duration_seconds: Math.max(0, Math.floor((Date.now() - sessionStartedAt) / 1000)) });
  }

  window.setInterval(function () {
    if (document.visibilityState !== "hidden") sendHeartbeat();
  }, 15000);
  document.addEventListener("visibilitychange", function () {
    if (document.visibilityState === "hidden") sendHeartbeat();
  });

  document.addEventListener("click", function (event) {
    var target = event.target && event.target.closest ? event.target.closest("a,button,[role='button']") : null;
    if (!target) return;
    var href = target.getAttribute("href") || "";
    if (/^tel:/i.test(href)) send("phone_click");
    else if (/^mailto:/i.test(href)) send("email_click");
    else if (/(wa\.me|api\.whatsapp\.com)/i.test(href)) send("whatsapp_click");
    else if (/(t\.me|telegram\.me)/i.test(href)) send("telegram_click");
    else if (target.tagName.toLowerCase() === "button") send("button_click", { label: (target.textContent || "").trim().slice(0, 120) });
    else if (href && /^https?:/i.test(href) && new URL(href, window.location.href).origin !== window.location.origin) send("external_link_click");
  }, { passive: true });

  document.addEventListener("submit", function () { send("form_submit"); }, { passive: true });
  ["pushState", "replaceState"].forEach(function (method) {
    var original = window.history[method];
    if (!original) return;
    window.history[method] = function () {
      var result = original.apply(this, arguments);
      window.setTimeout(pageView, 0);
      return result;
    };
  });
  window.addEventListener("popstate", pageView);

  window.yaStatsPixel = window.yaStatsPixel || {};
  window.yaStatsPixel.track = send;
})();