const form = document.querySelector('#review-form');
const statusBox = document.querySelector('#status');
const resultBox = document.querySelector('#result');
const button = form.querySelector('button');

form.addEventListener('submit', async (event) => {
  event.preventDefault(); button.disabled = true; resultBox.hidden = true;
  statusBox.className = 'status'; statusBox.textContent = 'Odczytuję dokładne liczniki…';
  try {
    const response = await fetch('/api/reviews', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({url: document.querySelector('#maps-url').value})});
    const data = await response.json();
    if (!response.ok) throw new Error(data.error || 'Nie udało się pobrać danych.');
    document.querySelector('#total').textContent = data.total.toLocaleString('pl-PL');
    document.querySelector('#average').textContent = data.average.toLocaleString('pl-PL', {minimumFractionDigits: 2});
    const max = Math.max(...Object.values(data.ratings), 1);
    const rows = Object.entries(data.ratings).map(([stars, count]) => {
      const row = document.createElement('div'); row.className = 'rating-row';
      const label = document.createElement('span'); label.textContent = `${stars} ★`;
      const bar = document.createElement('div'); bar.className = 'bar';
      const fill = document.createElement('i'); fill.style.width = `${count / max * 100}%`; bar.append(fill);
      const value = document.createElement('strong'); value.textContent = count.toLocaleString('pl-PL');
      row.append(label, bar, value); return row;
    });
    document.querySelector('#ratings').replaceChildren(...rows);
    statusBox.textContent = ''; resultBox.hidden = false;
  } catch (error) { statusBox.className = 'status error'; statusBox.textContent = error.message; }
  finally { button.disabled = false; }
});