const qs = (selector, scope = document) => scope.querySelector(selector);
const qsa = (selector, scope = document) => [...scope.querySelectorAll(selector)];

const initHeader = () => {
  const header = qs(".site-header");
  const toggle = qs("[data-menu-toggle]");
  const panel = qs("[data-mobile-panel]");
  const page = document.body.dataset.page;
  let scrollTicking = false;

  if (page) {
    qsa(`[data-nav="${page}"]`).forEach((link) => link.classList.add("is-active"));
  }

  const updateHeader = () => {
    if (!header) return;
    header.classList.toggle("is-scrolled", window.scrollY > 24);
    scrollTicking = false;
  };

  const onScroll = () => {
    if (scrollTicking) return;
    scrollTicking = true;
    window.requestAnimationFrame(updateHeader);
  };

  updateHeader();
  window.addEventListener("scroll", onScroll, { passive: true });

  if (toggle && panel) {
    toggle.addEventListener("click", () => {
      const isOpen = panel.classList.toggle("is-open");
      document.body.classList.toggle("menu-open", isOpen);
      toggle.setAttribute("aria-expanded", String(isOpen));
      const icon = qs("[data-menu-icon]", toggle);
      if (icon) icon.setAttribute("data-lucide", isOpen ? "x" : "menu");
      if (window.lucide) window.lucide.createIcons();
    });

    qsa("a", panel).forEach((link) => {
      link.addEventListener("click", () => {
        panel.classList.remove("is-open");
        document.body.classList.remove("menu-open");
        toggle.setAttribute("aria-expanded", "false");
        const icon = qs("[data-menu-icon]", toggle);
        if (icon) icon.setAttribute("data-lucide", "menu");
        if (window.lucide) window.lucide.createIcons();
      });
    });
  }
};

const initSmoothAnchors = () => {
  const smoothMotion = window.matchMedia("(prefers-reduced-motion: no-preference)").matches && window.matchMedia("(min-width: 768px)").matches;

  qsa('a[href^="#"]').forEach((anchor) => {
    anchor.addEventListener("click", (event) => {
      const target = qs(anchor.getAttribute("href"));
      if (!target) return;
      event.preventDefault();
      target.scrollIntoView({ behavior: smoothMotion ? "smooth" : "auto", block: "start" });
    });
  });
};

const initAnimations = () => {
  const reducedMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  if (window.AOS) {
    AOS.init({
      once: true,
      duration: 560,
      easing: "ease-out-cubic",
      offset: 70,
      disable: () => window.innerWidth < 640 || reducedMotion
    });
  }
};

const initHeroReveal = () => {
  qsa(".reveal-text").forEach((item, index) => {
    item.style.animationDelay = `${Math.min(index * 70, 420)}ms`;
  });
};

const initGallery = () => {
  const buttons = qsa("[data-filter]");
  const cards = qsa("[data-category]");
  if (!buttons.length || !cards.length) return;

  buttons.forEach((button) => {
    button.addEventListener("click", () => {
      const filter = button.dataset.filter;
      buttons.forEach((item) => item.classList.remove("is-active"));
      button.classList.add("is-active");

      cards.forEach((card) => {
        const show = filter === "all" || card.dataset.category === filter;
        card.style.display = show ? "inline-block" : "none";
      });

      if (window.AOS) AOS.refreshHard();
    });
  });
};

const initImageHints = () => {
  const fallback = "assets/images/gallery/studio-fallback.svg";

  const applyFallback = (img) => {
    if (img.dataset.fallbackApplied === "true") return;
    img.dataset.fallbackApplied = "true";
    img.src = fallback;
    img.alt = img.alt || "Venus Photo Studio And Lab image preview";

    const lightboxTrigger = img.closest("[data-lightbox]");
    if (lightboxTrigger) {
      lightboxTrigger.dataset.lightbox = fallback;
    }
  };

  qsa("img").forEach((img) => {
    img.decoding = "async";

    if (!img.hasAttribute("loading") && !img.closest(".site-header")) {
      img.loading = "lazy";
    }

    img.addEventListener("error", () => applyFallback(img), { once: true });

    if (img.complete && img.naturalWidth === 0) {
      applyFallback(img);
    }
  });
};

const initLightbox = () => {
  const triggers = qsa("[data-lightbox]");
  if (!triggers.length) return;

  const lightbox = document.createElement("div");
  lightbox.className = "lightbox";
  lightbox.setAttribute("role", "dialog");
  lightbox.setAttribute("aria-modal", "true");
  lightbox.innerHTML = `
    <button class="lightbox-close" type="button" aria-label="Close preview">
      <i data-lucide="x"></i>
    </button>
    <img alt="">
  `;
  document.body.appendChild(lightbox);

  const image = qs("img", lightbox);
  const close = qs(".lightbox-close", lightbox);

  const closeLightbox = () => {
    lightbox.classList.remove("is-open");
    document.body.classList.remove("menu-open");
    image.removeAttribute("src");
    image.alt = "";
  };

  triggers.forEach((trigger) => {
    trigger.addEventListener("click", () => {
      const source = trigger.dataset.lightbox || qs("img", trigger)?.src;
      const caption = trigger.dataset.caption || qs(".gallery-caption", trigger)?.textContent?.trim() || "Venus Photo Studio And Lab gallery preview";
      if (!source) return;
      image.src = source;
      image.alt = caption;
      lightbox.classList.add("is-open");
      document.body.classList.add("menu-open");
      if (window.lucide) window.lucide.createIcons();
    });
  });

  close.addEventListener("click", closeLightbox);
  lightbox.addEventListener("click", (event) => {
    if (event.target === lightbox) closeLightbox();
  });
  window.addEventListener("keydown", (event) => {
    if (event.key === "Escape") closeLightbox();
  });
};

const initContactForm = () => {
  const form = qs("[data-contact-form]");
  const note = qs("[data-form-note]");
  if (!form || !note) return;

  form.addEventListener("submit", (event) => {
    event.preventDefault();
    note.textContent = "Thank you. Your enquiry is ready to send through the connected contact channel.";
    note.classList.remove("hidden");
    form.reset();
  });
};

const initFooterYear = () => {
  qsa("[data-year]").forEach((item) => {
    item.textContent = String(new Date().getFullYear());
  });
};

document.addEventListener("DOMContentLoaded", () => {
  initHeader();
  initSmoothAnchors();
  initHeroReveal();
  initAnimations();
  initGallery();
  initLightbox();
  initContactForm();
  initImageHints();
  initFooterYear();
  if (window.lucide) window.lucide.createIcons();
});