/**
 * Home hero carousel — autoplay + dot navigation + mobile swipe
 */
(function () {
  var AUTOPLAY_MS = 5000;
  var SWIPE_THRESHOLD = 48;
  var MOBILE_MQ = '(max-width: 991.98px)';

  function initHomeHeroCarousel(root) {
    if (root.getAttribute('data-carousel-ready') === 'true') return;
    root.setAttribute('data-carousel-ready', 'true');

    var slides = root.querySelectorAll('[data-home-hero-slide]');
    var dots = root.querySelectorAll('[data-home-hero-dot]');
    var viewport = root.querySelector('.home-hero-carousel__viewport');
    if (!slides.length) return;

    var index = 0;
    var timer = null;
    var touchStartX = 0;
    var touchStartY = 0;
    var touchTracking = false;

    function setSlide(nextIndex) {
      index = (nextIndex + slides.length) % slides.length;

      slides.forEach(function (slide, i) {
        var active = i === index;
        slide.classList.toggle('is-active', active);
        slide.setAttribute('aria-hidden', active ? 'false' : 'true');
      });

      dots.forEach(function (dot, i) {
        var active = i === index;
        dot.classList.toggle('is-active', active);
        dot.setAttribute('aria-selected', active ? 'true' : 'false');
      });
    }

    function startAutoplay() {
      stopAutoplay();
      timer = window.setInterval(function () {
        setSlide(index + 1);
      }, AUTOPLAY_MS);
    }

    function stopAutoplay() {
      if (timer) {
        window.clearInterval(timer);
        timer = null;
      }
    }

    function isMobileSwipeEnabled() {
      return window.matchMedia(MOBILE_MQ).matches;
    }

    function bindTouchSwipe() {
      if (!viewport || viewport.getAttribute('data-swipe-ready') === 'true') return;
      viewport.setAttribute('data-swipe-ready', 'true');

      viewport.addEventListener(
        'touchstart',
        function (e) {
          if (!isMobileSwipeEnabled() || !e.touches.length) return;
          touchStartX = e.touches[0].clientX;
          touchStartY = e.touches[0].clientY;
          touchTracking = true;
          stopAutoplay();
        },
        { passive: true }
      );

      viewport.addEventListener(
        'touchend',
        function (e) {
          if (!touchTracking) return;
          touchTracking = false;

          if (!isMobileSwipeEnabled()) {
            startAutoplay();
            return;
          }

          var touch = e.changedTouches[0];
          if (!touch) {
            startAutoplay();
            return;
          }

          var dx = touch.clientX - touchStartX;
          var dy = touch.clientY - touchStartY;

          if (Math.abs(dx) < SWIPE_THRESHOLD || Math.abs(dx) <= Math.abs(dy)) {
            startAutoplay();
            return;
          }

          if (dx < 0) {
            setSlide(index + 1);
          } else {
            setSlide(index - 1);
          }
          startAutoplay();
        },
        { passive: true }
      );

      viewport.addEventListener(
        'touchcancel',
        function () {
          touchTracking = false;
          startAutoplay();
        },
        { passive: true }
      );
    }

    dots.forEach(function (dot) {
      dot.addEventListener('click', function () {
        var target = Number(dot.getAttribute('data-home-hero-dot'));
        if (Number.isNaN(target)) return;
        setSlide(target);
        startAutoplay();
      });
    });

    root.addEventListener('mouseenter', stopAutoplay);
    root.addEventListener('mouseleave', startAutoplay);
    root.addEventListener('focusin', stopAutoplay);
    root.addEventListener('focusout', function (e) {
      if (!root.contains(e.relatedTarget)) startAutoplay();
    });

    bindTouchSwipe();
    setSlide(0);
    startAutoplay();
  }

  function boot() {
    document.querySelectorAll('[data-home-hero-carousel]').forEach(initHomeHeroCarousel);
  }

  window.AifoHomeHeroCarouselInit = initHomeHeroCarousel;

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', boot);
  } else {
    boot();
  }

  document.addEventListener('aifo:home-hero-carousel-reload', boot);
})();