// 简易同步器：与 IIS API 交互
const SyncAPI = (function () {
  const base = AppConfig.API_BASE_URL; // 例如 /Api/Events.ashx

  async function listByMonth(year, month) {
    await (window.Auth && Auth.ensure ? Auth.ensure() : Promise.resolve());
    try {
      if (window.UI && UI.appendGlobalModalLog) UI.appendGlobalModalLog('开始调用 listByMonth');
    } catch (_) {}
    const url = `${base}?year=${year}&month=${month}&_ts=${Date.now()}`;
    const resp = await fetch(url, { cache: 'no-store', credentials: 'include' });
    const j = await resp.json();
    if (!j.ok) throw new Error(j.error || 'listByMonth failed');
    try {
      const count = Array.isArray(j.data) ? j.data.length : 0;
      if (window.UI && UI.appendGlobalModalLog) UI.appendGlobalModalLog('listByMonth 返回成功，数量=' + count);
    } catch (_) {}
    return j.data || [];
  }

  async function upsertEvent(ev) {
    await (window.Auth && Auth.ensure ? Auth.ensure() : Promise.resolve());
    try {
      if (window.UI && UI.appendGlobalModalLog) UI.appendGlobalModalLog('开始调用 upsertEvent');
    } catch (_) {}
    const resp = await fetch(base, {
      method: 'POST',
      headers: { 'Content-Type': 'text/plain' },
      credentials: 'include',
      body: JSON.stringify(ev),
    });
    const j = await resp.json();
    if (!j.ok) throw new Error(j.error || 'upsert failed');
    try {
      if (window.UI && UI.appendGlobalModalLog) UI.appendGlobalModalLog('upsertEvent 返回成功');
    } catch (_) {}
  }

  async function deleteEvent(id) {
    await (window.Auth && Auth.ensure ? Auth.ensure() : Promise.resolve());
    const url = `${base}?id=${encodeURIComponent(id)}`;
    try {
      const resp = await fetch(url, { method: 'DELETE', credentials: 'include' });
      if (resp.ok) {
        const j = await resp.json();
        if (!j.ok) throw new Error(j.error || 'delete failed');
        return;
      }
      if (resp.status !== 405) {
        const t = await resp.text();
        throw new Error(t || 'delete failed');
      }
    } catch (e) {}
    const resp2 = await fetch(`${url}&_method=DELETE`, { method: 'POST', headers: { 'Content-Type': 'text/plain' }, credentials: 'include', body: '' });
    const j2 = await resp2.json();
    if (!j2.ok) throw new Error(j2.error || 'delete failed');
  }

  return { listByMonth, upsertEvent, deleteEvent };
})();

window.SyncAPI = SyncAPI;