document.addEventListener('DOMContentLoaded', function () {
  var menuButton = document.querySelector('.menu-toggle');
  var nav = document.querySelector('.nav');
  if (menuButton && nav) menuButton.addEventListener('click', function () { nav.classList.toggle('open'); });

  var slides = Array.from(document.querySelectorAll('.slide'));
  if (slides.length) {
    var index = slides.findIndex(function (s) { return s.classList.contains('active'); });
    if (index < 0) index = 0;
    function show(next) {
      slides[index].classList.remove('active');
      index = (next + slides.length) % slides.length;
      slides[index].classList.add('active');
    }
    var prev = document.querySelector('.slide-arrow.left');
    var next = document.querySelector('.slide-arrow.right');
    if (prev) prev.addEventListener('click', function () { show(index - 1); });
    if (next) next.addEventListener('click', function () { show(index + 1); });
    setInterval(function () { show(index + 1); }, 6000);
  }

  var officeDataEl = document.getElementById('office-data');
  if (officeDataEl) {
    var officeData = JSON.parse(officeDataEl.textContent);
    var officeLinks = Array.from(document.querySelectorAll('[data-office]'));
    function selectOffice(id) {
      var data = officeData[id] || officeData.sydney;
      officeLinks.forEach(function (a) { a.classList.toggle('active', a.dataset.office === id); });
      document.getElementById('office-title').textContent = 'Wind Engineering & Wind Tunnel Testing Specialists - ' + data[0];
      document.getElementById('office-copy').textContent = data[1];
      document.getElementById('office-phone').textContent = data[2];
      document.getElementById('office-phone-link').href = 'tel:' + data[2].replace(/[^+0-9]/g, '');
      document.getElementById('office-address').textContent = data[3];
      document.getElementById('office-map').href = 'https://maps.google.com/?q=' + encodeURIComponent(data[3]);
    }
    officeLinks.forEach(function (a) { a.addEventListener('click', function () { selectOffice(a.dataset.office); }); });
    selectOffice((location.hash || '#sydney').slice(1));
  }
});

// Homepage news carousel: shows three desktop tiles, one mobile tile.
document.addEventListener('DOMContentLoaded', function () {
  var tiles = Array.from(document.querySelectorAll('[data-news-slide]'));
  var dotsWrap = document.querySelector('.news-dots');
  if (!tiles.length || !dotsWrap) return;
  var current = 0;
  function visibleCount() { return window.matchMedia('(max-width: 900px)').matches ? 1 : 3; }
  function pageCount() { return Math.max(1, tiles.length - visibleCount() + 1); }
  function drawDots() {
    dotsWrap.innerHTML = '';
    for (var i = 0; i < pageCount(); i += 1) {
      var dot = document.createElement('button');
      dot.type = 'button';
      dot.className = 'news-dot';
      dot.setAttribute('aria-label', 'Show news set ' + (i + 1));
      dot.dataset.index = String(i);
      dot.addEventListener('click', function () { showNews(Number(this.dataset.index)); });
      dotsWrap.appendChild(dot);
    }
  }
  function showNews(next) {
    current = (next + pageCount()) % pageCount();
    var count = visibleCount();
    tiles.forEach(function (tile, i) { tile.classList.toggle('visible', i >= current && i < current + count); });
    Array.from(dotsWrap.children).forEach(function (dot, i) { dot.classList.toggle('active', i === current); });
  }
  var prev = document.querySelector('.news-prev');
  var next = document.querySelector('.news-next');
  if (prev) prev.addEventListener('click', function () { showNews(current - 1); });
  if (next) next.addEventListener('click', function () { showNews(current + 1); });
  window.addEventListener('resize', function () { drawDots(); showNews(Math.min(current, pageCount() - 1)); });
  drawDots();
  showNews(0);
});