/* Zoeken in de bovenbalk: live resultaten (search_live) onder het veld; Enter opent de volledige zoekpagina.
 * Pijltjes lopen door de resultaten, Escape sluit, "/" springt naar het zoekveld. */
(() => {
  const esc = (s) => String(s ?? '').replace(/[&<>"']/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' })[c]);

  document.querySelectorAll('form.tsearch').forEach((form) => {
    const input = form.querySelector('input[name=q]');
    const box = form.querySelector('.tsearch-results');
    let timer = null, ctrl = null, last = '';

    const items = () => [...box.querySelectorAll('a')];
    const close = () => { box.classList.remove('open'); input.setAttribute('aria-expanded', 'false'); };
    const open = () => { if (box.innerHTML) { box.classList.add('open'); input.setAttribute('aria-expanded', 'true'); } };

    const render = (data) => {
      box.innerHTML = data.groups.length
        ? data.groups.map((g) => `<div class="ts-group">${esc(g.label)}</div>` + g.items.map((i) =>
            `<a class="ts-item" role="option" href="${esc(i.url)}">${esc(i.title)}${i.sub ? `<small>${esc(i.sub)}</small>` : ''}</a>`).join('')).join('')
          + `<a class="ts-all" href="${esc(data.url)}">Alle resultaten voor “${esc(data.q)}”</a>`
        : `<div class="ts-empty">Niets gevonden voor “${esc(data.q)}”.</div>`;
      open();
    };

    input.addEventListener('input', () => {
      clearTimeout(timer);
      const v = input.value.trim();
      if (v.length < 2) { box.innerHTML = ''; close(); return; }
      timer = setTimeout(() => {
        if (v === last && box.innerHTML) { open(); return; }
        if (ctrl) ctrl.abort();
        ctrl = new AbortController();
        fetch(`${form.dataset.live}?q=${encodeURIComponent(v)}`, { signal: ctrl.signal, headers: { Accept: 'application/json' } })
          .then((r) => (r.ok ? r.json() : null))
          .then((d) => { if (d && input.value.trim() === v) { last = v; render(d); } })
          .catch(() => {});
      }, 180);
    });

    form.addEventListener('keydown', (e) => {
      const list = items(), at = list.indexOf(document.activeElement);
      if (e.key === 'ArrowDown' && list.length) { e.preventDefault(); open(); list[Math.min(at + 1, list.length - 1)].focus(); }
      else if (e.key === 'ArrowUp' && list.length) { e.preventDefault(); (at <= 0 ? input : list[at - 1]).focus(); }
      else if (e.key === 'Escape') { close(); input.focus(); }
    });
    input.addEventListener('focus', () => { if (input.value.trim().length >= 2) open(); });
    document.addEventListener('click', (e) => { if (!form.contains(e.target)) close(); });

    // mobiel: het veld krijgt de focus zodra het uitklapmenu opengaat
    const toggle = form.closest('.dropdown')?.querySelector('[data-bs-toggle="dropdown"]');
    if (toggle) toggle.addEventListener('shown.bs.dropdown', () => input.focus());
  });

  document.addEventListener('keydown', (e) => {
    if (e.key !== '/' || e.ctrlKey || e.metaKey || e.altKey || e.target.closest('input, textarea, select, [contenteditable]')) return;
    const input = [...document.querySelectorAll('form.tsearch input[name=q]')].find((i) => i.offsetParent);
    if (input) { e.preventDefault(); input.focus(); input.select(); }
  });
})();