$(function () {
  // Navbar scroll
  $(window).on("scroll", function () {
    if ($(this).scrollTop() > 60) $("#navbar").addClass("scrolled");
    else $("#navbar").removeClass("scrolled");
  });

  // Hero animation on load
  setTimeout(function () {
    $("#heroContent").addClass("visible");
    $("#heroBg").addClass("loaded");
  }, 200);

  // Scroll animations
  function checkVisible() {
    $(".fact, [data-animate]").each(function () {
      var el = $(this);
      var top = el.offset().top;
      var windowBottom = $(window).scrollTop() + $(window).height();
      if (windowBottom > top + 60) {
        el.addClass("visible");
        el.css({ opacity: 1, transform: "translateY(0)" });
      }
    });
  }
  $("[data-animate]").css({
    opacity: 0,
    transform: "translateY(30px)",
    transition: "opacity 0.8s ease, transform 0.8s ease",
  });
  $(window).on("scroll", checkVisible);
  checkVisible();

  // Floor accordion
  $(".floor-header").on("click", function () {
    var item = $(this).closest(".floor-item");
    var isOpen = item.hasClass("open");
    $(".floor-item").removeClass("open");
    $(".floor-header").attr("aria-expanded", "false");
    $(".floor-body").slideUp(300);
    if (!isOpen) {
      item.addClass("open");
      $(this).attr("aria-expanded", "true");
      item.find(".floor-body").slideDown(300);
    }
  });

  // Accordion keyboard handler (Enter/Space)
  $(".floor-header").on("keydown", function (e) {
    if (e.key === "Enter" || e.key === " ") {
      e.preventDefault();
      $(this).trigger("click");
    }
  });

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

  function openLightbox(src) {
    lightboxTrigger = document.activeElement;
    $("#lightboxImg").attr("src", src).attr("alt", "");
    $("#lightbox").addClass("open");
    $("body").css("overflow", "hidden");
    // Set focus to close button
    setTimeout(function () {
      $("#lightboxClose").focus();
    }, 50);
  }

  function closeLightbox() {
    $("#lightbox").removeClass("open");
    $("body").css("overflow", "");
    // Return focus to trigger
    if (lightboxTrigger) {
      $(lightboxTrigger).focus();
      lightboxTrigger = null;
    }
  }

  // Lightbox – gallery grid items
  $(document).on("click", ".grid-item", function () {
    var src = $(this).data("img") || $(this).find("img").attr("src");
    openLightbox(src);
  });

  // Lightbox – floor plan images in Raumaufteilung
  $(document).on("click", ".floor-plan img[data-img]", function () {
    var src = $(this).data("img");
    openLightbox(src);
  });

  // Lightbox close handlers
  $("#lightboxClose").on("click", function () {
    closeLightbox();
  });
  $("#lightbox").on("click", function (e) {
    if (e.target === this) {
      closeLightbox();
    }
  });

  // Escape key to close lightbox
  $(document).on("keydown", function (e) {
    if (e.key === "Escape" && $("#lightbox").hasClass("open")) {
      closeLightbox();
    }
  });

  // Focus trap for lightbox
  $("#lightbox").on("keydown", function (e) {
    if (e.key !== "Tab") return;

    var focusable = $(this).find("button, [href], input, select, textarea, [tabindex]:not([tabindex='-1'])").filter(":visible");
    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();
      }
    }
  });

  // Gallery keyboard handler (Enter/Space)
  $(document).on("keydown", ".grid-item", function (e) {
    if (e.key === "Enter" || e.key === " ") {
      e.preventDefault();
      $(this).trigger("click");
    }
  });

  // Form submit – opens email client with pre-filled mailto: link
  $("#contactForm").on("submit", function (e) {
    e.preventDefault();

    var fname = $("#fname").val().trim();
    var lname = $("#lname").val().trim();
    var email = $("#email").val().trim();
    var phone = $("#phone").val().trim();
    var interest = $("#interest").val();
    var message = $("#message").val().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
    $("#contactForm").hide();
    $("#formSuccess").fadeIn(400);
  });
});