(function () {
  'use strict';

  function debounce(fn, delay) {
    var t;
    return function () {
      var ctx = this;
      var args = arguments;
      clearTimeout(t);
      t = setTimeout(function () { fn.apply(ctx, args); }, delay);
    };
  }

  function createDropdownEl() {
    var el = document.createElement('div');
    el.className = 'searchDropdown';
    el.hidden = true;
    el.setAttribute('role', 'listbox');
    return el;
  }

  function attachToInput(input) {
    if (!input || input.dataset.autocompleteBound === '1') return;
    input.dataset.autocompleteBound = '1';

    // wrapper for positioning
    var wrapper = input.closest('.nav__searchField');
    if (!wrapper) return;
    wrapper.classList.add('nav__searchField--hasDropdown');

    // dropdown
    var dropdown = createDropdownEl();
    wrapper.appendChild(dropdown);

    var activeIndex = -1;
    var items = [];
    var abortController = null;

    function close() {
      dropdown.hidden = true;
      dropdown.innerHTML = '';
      dropdown.classList.remove('is-open');
      activeIndex = -1;
      items = [];
    }

    function open() {
      dropdown.hidden = false;
      dropdown.classList.add('is-open');
    }

    function setStatus(text) {
      dropdown.innerHTML = '';
      var row = document.createElement('div');
      row.className = 'searchDropdown__status';
      row.textContent = text;
      dropdown.appendChild(row);
      open();
    }

    function render(list) {
      dropdown.innerHTML = '';
      items = list || [];
      activeIndex = -1;

      if (!items.length) {
        setStatus('Keine Produkte gefunden.');
        return;
      }

      for (var i = 0; i < items.length; i++) {
        (function (idx) {
          var it = items[idx];

          var a = document.createElement('a');
          a.className = 'searchDropdown__item';
          a.href = it.url;
          a.setAttribute('role', 'option');
          a.tabIndex = -1;

          var img = document.createElement('img');
          img.className = 'searchDropdown__img';
          img.alt = '';
          img.loading = 'lazy';
          img.decoding = 'async';
          img.src = it.imagePath && it.imagePath.length ? it.imagePath : 'assets/images/placeholder.png';

          var meta = document.createElement('div');
          meta.className = 'searchDropdown__meta';

          var title = document.createElement('div');
          title.className = 'searchDropdown__title';
          title.textContent = it.model || '';

          var desc = document.createElement('div');
          desc.className = 'searchDropdown__desc';
          desc.textContent = it.description || '';

          meta.appendChild(title);
          meta.appendChild(desc);

          a.appendChild(img);
          a.appendChild(meta);

          a.addEventListener('mouseenter', function () {
            setActive(idx);
          });

          dropdown.appendChild(a);
        })(i);
      }

      open();
    }

    function setActive(idx) {
      var children = dropdown.querySelectorAll('.searchDropdown__item');
      for (var i = 0; i < children.length; i++) {
        children[i].classList.toggle('is-active', i === idx);
      }
      activeIndex = idx;
    }

    function fetchResults(q) {
      if (abortController) {
        abortController.abort();
      }
      abortController = new AbortController();

      var url = 'api/search_products.php?q=' + encodeURIComponent(q) + '&limit=8';

      setStatus('Suche…');

      fetch(url, { signal: abortController.signal, headers: { 'Accept': 'application/json' } })
        .then(function (r) {
          if (!r.ok) throw new Error('HTTP ' + r.status);
          return r.json();
        })
        .then(function (data) {
          render((data && data.items) ? data.items : []);
        })
        .catch(function (err) {
          if (err && err.name === 'AbortError') return;
          setStatus('Fehler bei der Suche.');
        });
    }

    var debounced = debounce(function () {
      var q = (input.value || '').trim();
      if (q.length < 1) {
        close();
        return;
      }
      fetchResults(q);
    }, 180);

    input.addEventListener('input', debounced);

    input.addEventListener('focus', function () {
      var q = (input.value || '').trim();
      if (q.length >= 1) {
        fetchResults(q);
      }
    });

    input.addEventListener('keydown', function (e) {
      if (dropdown.hidden) return;

      if (e.key === 'Escape') {
        close();
        return;
      }

      var max = items.length - 1;
      if (max < 0) return;

      if (e.key === 'ArrowDown') {
        e.preventDefault();
        var next = activeIndex + 1;
        if (next > max) next = 0;
        setActive(next);
      } else if (e.key === 'ArrowUp') {
        e.preventDefault();
        var prev = activeIndex - 1;
        if (prev < 0) prev = max;
        setActive(prev);
      } else if (e.key === 'Enter') {
        if (activeIndex >= 0) {
          var links = dropdown.querySelectorAll('.searchDropdown__item');
          if (links[activeIndex]) {
            e.preventDefault();
            window.location.href = links[activeIndex].href;
          }
        }
      }
    });

    document.addEventListener('click', function (e) {
      if (wrapper.contains(e.target)) return;
      close();
    });

    // prevent blur-close when clicking inside dropdown until navigation happens
    dropdown.addEventListener('mousedown', function (e) {
      e.preventDefault();
    });
  }

  function init() {
    var inputs = document.querySelectorAll('input.nav__searchInput[name="search"]');
    for (var i = 0; i < inputs.length; i++) {
      attachToInput(inputs[i]);
    }
  }

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