(() => {
  document.documentElement.classList.add('js-enabled');
  const feedback = document.getElementById('download-feedback');
  const report = (message) => {
    if (feedback) { feedback.textContent = message; feedback.hidden = false; }
  };
  const post = async (path, body = {}) => {
    const response = await fetch(path, {
      method: 'POST', credentials: 'same-origin',
      headers: {'Content-Type': 'application/json'}, body: JSON.stringify(body),
    });
    const payload = await response.json();
    if (!response.ok) throw new Error(payload.message || 'The request could not be completed.');
    return payload;
  };
  document.querySelectorAll('[data-auto-submit] select').forEach(select => {
    select.addEventListener('change', () => select.form.requestSubmit());
  });
  document.querySelectorAll('[data-artifact-select]').forEach(select => {
    select.addEventListener('change', () => {
      const option = select.selectedOptions[0];
      const panel = select.closest('.platform-panel');
      panel.querySelector('[data-file-info]').textContent = option.dataset.format + ' · ' + option.dataset.size;
      panel.querySelector('[data-system-info]').textContent = option.dataset.system;
      const download = panel.querySelector('[data-latest-download]');
      download.href = option.value;
      download.setAttribute('aria-label', 'Download ' + option.dataset.file);
      download.lastChild.textContent = 'Download ' + option.dataset.format;
    });
  });
  const osText = navigator.userAgentData?.platform || navigator.platform || navigator.userAgent;
  const os = /mac/i.test(osText) ? 'macos' : /win/i.test(osText) ? 'windows' : /linux/i.test(osText) ? 'linux' : null;
  const recommended = os && document.querySelector('[data-platform="' + os + '"]');
  if (recommended && recommended.querySelector('[data-latest-download]')) {
    recommended.classList.add('is-recommended');
    recommended.querySelector('[data-recommendation]').textContent = 'Recommended for this device';
  }
  const form = document.getElementById('private-download-form');
  if (form) form.addEventListener('submit', async event => {
    event.preventDefault();
    const input = document.getElementById('access-key');
    const error = document.getElementById('key-error');
    const submit = form.querySelector('button');
    error.hidden = true; submit.disabled = true;
    submit.setAttribute('aria-busy', 'true');
    try {
      const result = await post('/downloads/private', {access_key: input.value.trim()});
      input.value = '';
      window.location.assign(result.location);
    } catch (failure) {
      error.textContent = failure.message; error.hidden = false;
    } finally {
      submit.disabled = false; submit.removeAttribute('aria-busy');
    }
  });
  document.querySelectorAll('[data-clear-key], [data-logout]').forEach(button => {
    button.addEventListener('click', async () => {
      button.disabled = true;
      try {
        await post('/downloads/private/clear');
        if (button.hasAttribute('data-logout')) await post('/auth/v2/web/logout');
        window.location.assign('/downloads');
      } catch (failure) { report(failure.message); button.disabled = false; }
    });
  });
})();