document.addEventListener("DOMContentLoaded", function () {
  // Navbar scroll
  var navbar = document.getElementById("navbar");
  window.addEventListener("scroll", function () {
    if (window.scrollY > 60) navbar.classList.add("scrolled");
    else navbar.classList.remove("scrolled");
  });

  // Hero animation on load
  setTimeout(function () {
    document.getElementById("heroContent").classList.add("visible");
    document.getElementById("heroBg").classList.add("loaded");
  }, 200);

  // Scroll animations via IntersectionObserver
  var animElements = document.querySelectorAll(".fact, [data-animate]");
  animElements.forEach(function (el) {
    el.style.opacity = "0";
    el.style.transform = "translateY(30px)";
    el.style.transition = "opacity 0.8s ease, transform 0.8s ease";
  });

  if ("IntersectionObserver" in window) {
    var observer = new IntersectionObserver(
      function (entries) {
        entries.forEach(function (entry) {
          if (entry.isIntersecting) {
            entry.target.classList.add("visible");
            entry.target.style.opacity = "1";
            entry.target.style.transform = "translateY(0)";
            observer.unobserve(entry.target);
          }
        });
      },
      { rootMargin: "0px 0px -60px 0px" }
    );
    animElements.forEach(function (el) {
      observer.observe(el);
    });
  } else {
    // Fallback: show all immediately
    animElements.forEach(function (el) {
      el.classList.add("visible");
      el.style.opacity = "1";
      el.style.transform = "translateY(0)";
    });
  }

  // Floor accordion
  // Floor accordion (vanilla JS + a11y)
  document.querySelectorAll(".floor-header").forEach(function (header) {
    header.addEventListener("click", function () {
      var item = this.closest(".floor-item");
      var isOpen = item.classList.contains("open");
      var allItems = document.querySelectorAll(".floor-item");

      // Close all
      allItems.forEach(function (fi) {
        fi.classList.remove("open");
        var hdr = fi.querySelector(".floor-header");
        if (hdr) hdr.setAttribute("aria-expanded", "false");
        var body = fi.querySelector(".floor-body");
        if (body) body.style.display = "none";
      });

      // Open clicked if it was closed
      if (!isOpen) {
        item.classList.add("open");
        this.setAttribute("aria-expanded", "true");
        var body = item.querySelector(".floor-body");
        if (body) body.style.display = "block";
      }
    });
  });

  // Accordion keyboard handler (Enter/Space)
  document.querySelectorAll(".floor-header").forEach(function (header) {
    header.addEventListener("keydown", function (e) {
      if (e.key === "Enter" || e.key === " ") {
        e.preventDefault();
        this.click();
      }
    });
  });

  // Lightbox – track last focused element for focus return
  var lightboxTrigger = null;

  function openLightbox(src) {
    lightboxTrigger = document.activeElement;
    var img = document.getElementById("lightboxImg");
    // WebP fallback: if .webp fails, try original format
    img.onerror = function () {
      if (img.getAttribute('src').endsWith('.webp')) {
        img.setAttribute('src', src.replace(/\.webp$/, '.png'));
      }
    };
    img.setAttribute("src", src);
    img.setAttribute("alt", "");
    document.getElementById("lightbox").classList.add("open");
    document.body.style.overflow = "hidden";
    // Set focus to close button
    setTimeout(function () {
      document.getElementById("lightboxClose").focus();
    }, 50);
  }

  function closeLightbox() {
    document.getElementById("lightbox").classList.remove("open");
    document.body.style.overflow = "";
    // Return focus to trigger
    if (lightboxTrigger) {
      lightboxTrigger.focus();
      lightboxTrigger = null;
    }
  }

  // Lightbox – gallery grid items
  document.querySelectorAll(".grid-item").forEach(function (item) {
    item.addEventListener("click", function () {
      var src = this.dataset.img || this.querySelector("img").getAttribute("src");
      openLightbox(src);
    });
  });

  // Gallery keyboard handler (Enter/Space)
  document.querySelectorAll(".grid-item").forEach(function (item) {
    item.setAttribute("tabindex", "0");
    item.addEventListener("keydown", function (e) {
      if (e.key === "Enter" || e.key === " ") {
        e.preventDefault();
        this.click();
      }
    });
  });

  // Lightbox – floor plan images in Raumaufteilung
  document.querySelectorAll(".floor-plan img[data-img]").forEach(function (img) {
    img.addEventListener("click", function () {
      openLightbox(this.dataset.img);
    });
  });



  document.getElementById("lightboxClose").addEventListener("click", closeLightbox);
  document.getElementById("lightbox").addEventListener("click", function (e) {
    if (e.target === this) closeLightbox();
  });
  document.addEventListener("keydown", function (e) {
    if (e.key === "Escape") closeLightbox();
  });

  // Focus trap for lightbox
  document.getElementById("lightbox").addEventListener("keydown", function (e) {
    if (e.key !== "Tab") return;

    var focusable = this.querySelectorAll("button, [href], input, select, textarea, [tabindex]:not([tabindex='-1'])");
    focusable = Array.from(focusable).filter(function (el) { return el.offsetParent !== null; });
    if (focusable.length === 0) return;

    var first = focusable[0];
    var last = focusable[focusable.length - 1];

    if (e.shiftKey) {
      if (document.activeElement === first) {
        e.preventDefault();
        last.focus();
      }
    } else {
      if (document.activeElement === last) {
        e.preventDefault();
        first.focus();
      }
    }
  });

  // Form submit is handled server-side by PHP – no JS intervention needed.
  // Form submit – opens email client with pre-filled mailto: link
  document.getElementById("contactForm").addEventListener("submit", function (e) {
    e.preventDefault();

    var fname = document.getElementById("fname").value.trim();
    var lname = document.getElementById("lname").value.trim();
    var email = document.getElementById("email").value.trim();
    var phone = document.getElementById("phone").value.trim();
    var interest = document.getElementById("interest").value;
    var message = document.getElementById("message").value.trim();

    var subject = "Kontaktanfrage: " + interest;
    var body = "Von: " + fname + " " + lname + "\n";
    body += "E-Mail: " + email + "\n";
    if (phone) body += "Telefon: " + phone + "\n";
    body += "Anliegen: " + interest + "\n\n";
    body += message;

    var mailto =
      "mailto:mki@kies-media.de" +
      "?subject=" + encodeURIComponent(subject) +
      "&body=" + encodeURIComponent(body);

    window.location.href = mailto;

    // Show success message
    this.style.display = "none";
    var success = document.getElementById("formSuccess");
    success.style.display = "block";
    success.style.opacity = "0";
    success.style.transition = "opacity 0.4s ease";
    requestAnimationFrame(function () {
      success.style.opacity = "1";
    });
  });
});

// Mobile hamburger menu (vanilla JS)
(function () {
  var hamburger = document.querySelector(".nav-hamburger");
  var nav = document.getElementById("navbar");
  var overlay = document.querySelector(".nav-mobile-overlay");
  var links = nav ? nav.querySelectorAll(".nav-links a") : [];

  function toggleMenu() {
    var isOpen = hamburger.classList.toggle("active");
    nav.classList.toggle("mobile-open", isOpen);
  if (overlay) overlay.classList.toggle("active", isOpen);
    hamburger.setAttribute("aria-expanded", isOpen);
    document.body.style.overflow = isOpen ? "hidden" : "";
  }

  function closeMenu() {
    hamburger.classList.remove("active");
    nav.classList.remove("mobile-open");
    if (overlay) overlay.classList.remove("active");
    hamburger.setAttribute("aria-expanded", "false");
    document.body.style.overflow = "";
  }

  if (hamburger) {
    hamburger.addEventListener("click", toggleMenu);
  }

  if (overlay) {
    overlay.addEventListener("click", closeMenu);
  }

  links.forEach(function (link) {
    link.addEventListener("click", closeMenu);
  });

  document.addEventListener("keydown", function (e) {
    if (e.key === "Escape") closeMenu();
  });

  // Close on resize to desktop
  window.addEventListener("resize", function () {
    if (window.innerWidth > 900) closeMenu();
  });
})();