// Shared client-side news search over /search.json (no dependencies, no modules).
// Used by the homepage hero (live suggestions) and /search (full results).
(function () {
  window.newsSearch = function (opts) {
    const input = document.getElementById(opts.input);
    const list = document.getElementById(opts.list);
    const status = document.getElementById(opts.status);
    let index = null;
    let timer;
    // First title match wrapped in <mark> (Starlight search pattern) — built
    // from text nodes, never innerHTML.
    function highlight(text, q) {
      const i = text.toLowerCase().indexOf(q);
      if (i < 0) return [text];
      const mark = document.createElement('mark');
      mark.textContent = text.slice(i, i + q.length);
      return [text.slice(0, i), mark, text.slice(i + q.length)];
    }
    async function run() {
      const q = input.value.trim().toLowerCase();
      list.innerHTML = '';
      if (q.length < 2) { status.textContent = opts.hint || ''; return; }
      if (!index) index = await (await fetch('/search.json')).json();
      const hits = index
        .filter((p) => (p.title + ' ' + p.description + ' ' + p.category).toLowerCase().includes(q))
        .slice(0, opts.limit);
      const unit = opts.unit || 'result';
      status.textContent = hits.length
        ? hits.length + ' ' + unit + (hits.length === 1 ? '' : 's') + ' for “' + input.value.trim() + '”'
        : 'No results for “' + input.value.trim() + '” — try a shorter or different term.';
      for (const p of hits) {
        const li = document.createElement('li');
        const a = document.createElement('a');
        a.href = '/news/' + encodeURIComponent(p.slug);
        a.append(...highlight(p.title, q));
        const small = document.createElement('small');
        small.textContent = p.date;
        li.append(a, small);
        list.append(li);
      }
    }
    input.addEventListener('input', () => { clearTimeout(timer); timer = setTimeout(run, 150); });
    return run; // callers may run() immediately (e.g. /search?q=…)
  };
})();