window.$ = (id) => document.getElementById(id);

window.escapeHtml = (s) => String(s == null ? '' : s).replace(/[&<>"']/g, (c) => ({
  '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;'
}[c]));

// 结果会被插进 style="..."，cover 来自第三方接口，属不可信输入。
// 既要防 CSS 串逃逸（引号、反斜杠、括号），也要防 HTML 属性逃逸（交给 escapeHtml）。
window.coverStyle = (cover) => {
  if (!cover) return '';
  const raw = String(cover);
  const url = /^(https?:|data:)/i.test(raw) ? raw : 'file:///' + raw.replace(/\\/g, '/');
  if (/[\r\n]/.test(url)) return '';
  const css = url.replace(/[\\'"()]/g, (c) => '\\' + c);
  return window.escapeHtml(`background-image:url('${css}')`);
};

window.copyText = async (btn, text) => {
  await window.api.copy(text);
  const orig = btn.textContent;
  btn.textContent = '已复制 ✓';
  btn.classList.add('copied');
  setTimeout(() => { btn.textContent = orig; btn.classList.remove('copied'); }, 1500);
};

window.formatDate = (ts) => {
  if (!ts) return '';
  const d = new Date(ts);
  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
};

window.getEnabledSources = () => {
  let ids = null;
  try {
    const raw = localStorage.getItem('enabledSources');
    if (raw) ids = JSON.parse(raw);
  } catch (e) { /* ignore */ }
  return ids;
};

window.setEnabledSources = (ids) => {
  localStorage.setItem('enabledSources', JSON.stringify(ids));
};

// 通用弹窗: 返回 Promise<{ok, values}|null>
window.openModal = (title, bodyHtml, onOk) => {
  const modal = $('modal');
  $('modalTitle').textContent = title;
  $('modalBody').innerHTML = bodyHtml;
  modal.classList.remove('hidden');
  return new Promise((resolve) => {
    const close = (result) => {
      modal.classList.add('hidden');
      $('modalOk').onclick = null;
      $('modalCancel').onclick = null;
      resolve(result);
    };
    $('modalCancel').onclick = () => close(null);
    $('modalOk').onclick = async () => {
      const r = onOk ? await onOk() : true;
      if (r !== false) close(r);
    };
  });
};

window.confirmModal = (title, text) => window.openModal(title, `<p>${escapeHtml(text)}</p>`);