/**
 * Loads shared nav/footer and applies active menu + copyright year.
 * Requires pages to be served over HTTP (see server.js).
 */
(function () {
  var NAV_URL = "/components/nav.html";
  var FOOTER_URL = "/components/footer.html";

  function normalizePath(pathname) {
    if (!pathname) return "/";
    var p = pathname.split("?")[0].split("#")[0];
    try {
      p = decodeURIComponent(p);
    } catch (e) {
      /* ignore */
    }
    if (p.endsWith("/index.html")) {
      p = p.slice(0, -"/index.html".length) || "/";
    }
    if (p.length > 1 && p.endsWith("/")) {
      p = p.slice(0, -1);
    }
    return p.toLowerCase();
  }

  function hrefToPath(href) {
    if (!href || href === "#" || href.indexOf("javascript:") === 0) return null;
    try {
      var url = new URL(href, window.location.origin);
      if (url.origin !== window.location.origin) return null;
      return normalizePath(url.pathname);
    } catch (e) {
      return null;
    }
  }

  function pathsMatch(current, target) {
    if (!target) return false;
    if (current === target) return true;
    if (
      (current === "/" || current === "/index.html") &&
      (target === "/" || target === "/index.html")
    ) {
      return true;
    }
    return false;
  }

  function highlightActiveNav(container) {
    var current = normalizePath(window.location.pathname);
    var links = container.querySelectorAll("a[href]");

    links.forEach(function (anchor) {
      var target = hrefToPath(anchor.getAttribute("href"));
      if (!pathsMatch(current, target)) return;

      anchor.classList.add("active");
      var item = anchor.closest(".nav-item");
      if (item) item.classList.add("active");

      if (anchor.classList.contains("dropdown-item")) {
        var parentItem = anchor.closest(".nav-item.dropdown");
        if (parentItem) {
          parentItem.classList.add("active");
          var toggle = parentItem.querySelector(".nav-link.dropdown-toggle");
          if (toggle) toggle.classList.add("active");
        }
      }
    });
  }

  function updateCopyrightYear(root) {
    var year = String(new Date().getFullYear());
    root.querySelectorAll("#current-year").forEach(function (el) {
      el.textContent = year;
    });
  }

  function fetchText(url) {
    return fetch(url, { credentials: "same-origin" }).then(function (res) {
      if (!res.ok) throw new Error("Failed to load " + url + " (" + res.status + ")");
      return res.text();
    });
  }

  function injectHtml(containerId, html) {
    var el = document.getElementById(containerId);
    if (!el) return null;
    el.innerHTML = html;
    return el;
  }

  function initLayout() {
    var navContainer = document.getElementById("nav-container");
    var footerContainer = document.getElementById("footer-container");
    if (!navContainer && !footerContainer) return;

    var tasks = [];
    if (navContainer) tasks.push(fetchText(NAV_URL));
    else tasks.push(Promise.resolve(null));
    if (footerContainer) tasks.push(fetchText(FOOTER_URL));
    else tasks.push(Promise.resolve(null));

    Promise.all(tasks)
      .then(function (parts) {
        var navHtml = parts[0];
        var footerHtml = parts[1];
        if (navHtml) {
          var navRoot = injectHtml("nav-container", navHtml);
          if (navRoot) highlightActiveNav(navRoot);
        }
        if (footerHtml) {
          var footerRoot = injectHtml("footer-container", footerHtml);
          if (footerRoot) updateCopyrightYear(footerRoot);
        }
        if (navHtml && window.jQuery && window.jQuery.fn.dropdown) {
          window.jQuery("#nav-container [data-toggle=\"dropdown\"]").dropdown();
        }
        document.dispatchEvent(new CustomEvent("aifo:layout-ready"));
      })
      .catch(function (err) {
        console.error("[layout.js]", err);
      });
  }

  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", initLayout);
  } else {
    initLayout();
  }
})();