(() => {
  const config = window.SOSTAVIKA_LANDING_CONFIG || {};
  const localFallback = {
    scan: "index.html#scan",
    search: "index.html#search",
    privacy: "privacy.html",
    about: "about.html"
  };
  const isLocalPreview =
    window.location.protocol === "file:" ||
    window.location.hostname === "localhost" ||
    window.location.hostname === "127.0.0.1" ||
    window.location.hostname === "";
  const routeMap = {
    scan: isLocalPreview ? localFallback.scan : config.scanUrl || "/scan",
    search: isLocalPreview ? localFallback.search : config.searchUrl || "/search",
    privacy: isLocalPreview ? localFallback.privacy : config.privacyUrl || "/privacy",
    about: isLocalPreview ? localFallback.about : config.aboutUrl || "/about"
  };

  const COOKIE_NAME = "sostavika_cookie_consent_v2";
  const COOKIE_MAX_AGE = 60 * 60 * 24 * 180;
  const COOKIE_VALUES = new Set(["essential", "analytics"]);

  const getCookie = (name) => {
    const prefix = `${encodeURIComponent(name)}=`;
    const item = document.cookie.split("; ").find((entry) => entry.startsWith(prefix));
    return item ? decodeURIComponent(item.slice(prefix.length)) : "";
  };

  const getConsent = () => {
    const value = getCookie(COOKIE_NAME);
    return COOKIE_VALUES.has(value) ? value : "";
  };

  let cookieConsent = getConsent();

  const updateAnalyticsConsent = (value, mode = "update") => {
    const allowed = value === "analytics";
    window.SOSTAVIKA_ANALYTICS_ALLOWED = allowed;
    if (typeof window.gtag === "function") {
      window.gtag("consent", mode, {
        analytics_storage: allowed ? "granted" : "denied",
        ad_storage: "denied",
        ad_user_data: "denied",
        ad_personalization: "denied"
      });
    }
    window.dispatchEvent(
      new CustomEvent("sostavika:cookie-consent", {
        detail: { analytics: allowed, value: value || "unset" }
      })
    );
  };

  updateAnalyticsConsent(cookieConsent, "default");

  const setConsent = (value) => {
    if (!COOKIE_VALUES.has(value)) return;
    const secure = window.location.protocol === "https:" ? "; Secure" : "";
    document.cookie = `${encodeURIComponent(COOKIE_NAME)}=${encodeURIComponent(value)}; Max-Age=${COOKIE_MAX_AGE}; Path=/; SameSite=Lax${secure}`;
    cookieConsent = value;
    updateAnalyticsConsent(cookieConsent);
  };

  document.querySelectorAll("[data-landing-link]").forEach((link) => {
    const key = link.getAttribute("data-landing-link");
    if (!routeMap[key]) return;
    const hash = link.hash || "";
    link.setAttribute("href", `${routeMap[key]}${hash}`);
  });

  document.querySelectorAll("[data-home-anchor]").forEach((link) => {
    const anchor = link.getAttribute("data-home-anchor");
    const root = isLocalPreview ? "landing.html" : "/";
    link.setAttribute("href", `${root}#${anchor}`);
  });

  const trackEvent = (eventName, params = {}) => {
    if (!eventName || cookieConsent !== "analytics") return;
    if (typeof window.gtag === "function") {
      window.gtag("event", eventName, params);
      return;
    }
    window.dataLayer = window.dataLayer || [];
    window.dataLayer.push({ event: eventName, ...params });
  };

  const cookieUi = document.createElement("div");
  cookieUi.innerHTML = `
    <aside class="cookie-banner" data-cookie-banner hidden aria-labelledby="cookie-banner-title">
      <div class="cookie-banner__inner">
        <div>
          <h2 id="cookie-banner-title">Настройки cookies</h2>
          <p>Обязательные cookies запоминают ваш выбор. Аналитика включается только с вашего согласия. <a href="${routeMap.privacy}">Политика приватности</a></p>
        </div>
        <div class="cookie-banner__actions">
          <button class="btn btn--light" type="button" data-cookie-essential>Только обязательные</button>
          <button class="btn btn--light" type="button" data-cookie-customize>Настроить</button>
          <button class="btn btn--dark" type="button" data-cookie-accept>Разрешить аналитику</button>
        </div>
      </div>
    </aside>
    <dialog class="cookie-dialog" data-cookie-dialog aria-labelledby="cookie-dialog-title">
      <div class="cookie-dialog__head">
        <div>
          <h2 id="cookie-dialog-title">Настройки приватности</h2>
        </div>
        <button class="menu-close" type="button" data-cookie-close>Закрыть</button>
      </div>
      <p>Обязательные cookies нужны для работы сайта. Аналитика включается только с вашего согласия.</p>
      <div class="cookie-options">
        <div class="cookie-option">
          <div><strong>Обязательные</strong><span>Хранят выбранные настройки 180 дней.</span></div>
          <span class="cookie-required" aria-label="Всегда включены">Всегда включены</span>
        </div>
        <label class="cookie-option">
          <div><strong>Аналитика</strong><span>Помогает понять, как используется сайт.</span></div>
          <input type="checkbox" data-cookie-analytics />
        </label>
      </div>
      <div class="cookie-dialog__actions">
        <a class="text-link" href="${routeMap.privacy}">Политика приватности</a>
        <button class="btn btn--dark" type="button" data-cookie-save>Сохранить выбор</button>
      </div>
    </dialog>
  `;
  document.body.append(...cookieUi.children);

  const cookieBanner = document.querySelector("[data-cookie-banner]");
  const cookieDialog = document.querySelector("[data-cookie-dialog]");
  const analyticsToggle = document.querySelector("[data-cookie-analytics]");
  let cookieReturnFocus = null;

  const hideCookieBanner = () => {
    if (cookieBanner) cookieBanner.hidden = true;
  };

  const chooseConsent = (value) => {
    setConsent(value);
    hideCookieBanner();
    if (cookieDialog && cookieDialog.open) cookieDialog.close();
  };

  const openCookieSettings = (opener) => {
    if (!cookieDialog) return;
    cookieReturnFocus = opener || document.activeElement;
    if (analyticsToggle) analyticsToggle.checked = cookieConsent === "analytics";
    cookieDialog.showModal();
    window.requestAnimationFrame(() => {
      if (analyticsToggle) analyticsToggle.focus();
    });
  };

  document.querySelector("[data-cookie-essential]")?.addEventListener("click", () => chooseConsent("essential"));
  document.querySelector("[data-cookie-accept]")?.addEventListener("click", () => chooseConsent("analytics"));
  document.querySelector("[data-cookie-customize]")?.addEventListener("click", (event) => openCookieSettings(event.currentTarget));
  document.querySelector("[data-cookie-save]")?.addEventListener("click", () => {
    chooseConsent(analyticsToggle && analyticsToggle.checked ? "analytics" : "essential");
  });
  document.querySelector("[data-cookie-close]")?.addEventListener("click", () => cookieDialog?.close());

  document.querySelectorAll("[data-cookie-settings-open]").forEach((button) => {
    button.addEventListener("click", () => openCookieSettings(button));
  });

  if (cookieDialog) {
    cookieDialog.addEventListener("click", (event) => {
      if (event.target === cookieDialog) cookieDialog.close();
    });
    cookieDialog.addEventListener("close", () => {
      if (cookieReturnFocus && typeof cookieReturnFocus.focus === "function") cookieReturnFocus.focus();
      cookieReturnFocus = null;
    });
  }

  if (!cookieConsent && cookieBanner) cookieBanner.hidden = false;

  document.querySelectorAll("[data-analytics-event]").forEach((link) => {
    link.addEventListener("click", () => {
      trackEvent(link.getAttribute("data-analytics-event"), {
        link_url: link.href,
        link_text: link.textContent.trim()
      });
    });
  });

  const skipLink = document.querySelector(".skip-link");
  const main = document.querySelector("#main");
  if (skipLink && main) {
    skipLink.addEventListener("click", (event) => {
      event.preventDefault();
      main.scrollIntoView({ block: "start" });
      window.history.replaceState(null, "", "#main");
      window.requestAnimationFrame(() => {
        main.focus({ preventScroll: true });
      });
    });
  }

  const menuToggle = document.querySelector(".menu-toggle");
  const menu = document.querySelector("#mobile-menu");
  const menuClose = menu ? menu.querySelector("[data-menu-close]") : null;
  let menuReturnFocus = null;

  const closeMenu = () => {
    if (!menu || !menu.open) return;
    menu.close();
  };

  if (menuToggle && menu) {
    menuToggle.addEventListener("click", () => {
      if (menu.open) {
        closeMenu();
        return;
      }
      menuReturnFocus = document.activeElement;
      menuToggle.setAttribute("aria-expanded", "true");
      document.body.classList.add("menu-open");
      menu.showModal();
      if (menuClose) menuClose.focus();
    });

    if (menuClose) menuClose.addEventListener("click", closeMenu);

    menu.addEventListener("click", (event) => {
      if (event.target === menu) closeMenu();
    });

    menu.addEventListener("keydown", (event) => {
      if (event.key !== "Escape") return;
      event.preventDefault();
      closeMenu();
    });

    menu.addEventListener("close", () => {
      menuToggle.setAttribute("aria-expanded", "false");
      document.body.classList.remove("menu-open");
      if (menuReturnFocus && typeof menuReturnFocus.focus === "function") {
        menuReturnFocus.focus();
      }
      menuReturnFocus = null;
    });

    menu.querySelectorAll("a").forEach((link) => {
      link.addEventListener("click", closeMenu);
    });

    window.addEventListener("resize", () => {
      if (window.innerWidth > 1024) closeMenu();
    });
  }
})();