async function apiFetch(path, options) {
  const opts = options || {};
  const headers = Object.assign({}, opts.headers || {});
  if (opts.body && !headers['Content-Type']) {
    headers['Content-Type'] = 'application/json';
  }
  const response = await fetch(path, {
    method: opts.method || 'GET',
    headers: headers,
    body: opts.body ? JSON.stringify(opts.body) : undefined,
    credentials: 'same-origin'
  });
  let data = null;
  try {
    data = await response.json();
  } catch (e) {
    data = {};
  }
  if (!response.ok) {
    const error = new Error((data && data.error) || '请求失败: ' + response.status);
    error.status = response.status;
    throw error;
  }
  return data;
}

function apiGetMe() {
  return apiFetch('/api/me');
}

function apiLogin(username, password) {
  return apiFetch('/api/login', { method: 'POST', body: { username: username, password: password } });
}

function apiRegister(username, password, displayName) {
  return apiFetch('/api/register', { method: 'POST', body: { username: username, password: password, displayName: displayName } });
}

function apiLogout() {
  return apiFetch('/api/logout', { method: 'POST' });
}

function apiChangePassword(data) {
  return apiFetch('/api/change-password', { method: 'POST', body: data });
}

function apiGetEntries() {
  return apiFetch('/api/entries');
}

function apiAddEntry(data) {
  return apiFetch('/api/entries', { method: 'POST', body: data });
}

function apiUpdateEntry(id, data) {
  return apiFetch('/api/entries/' + id, { method: 'PUT', body: data });
}

function apiDeleteEntry(id) {
  return apiFetch('/api/entries/' + id, { method: 'DELETE' });
}

function apiGetStats() {
  return apiFetch('/api/entries/stats');
}

function apiGetVocabulary() {
  return apiFetch('/api/vocabulary');
}

function apiAddVocabulary(data) {
  return apiFetch('/api/vocabulary', { method: 'POST', body: data });
}

function apiDeleteVocabulary(id) {
  return apiFetch('/api/vocabulary/' + id, { method: 'DELETE' });
}

function apiGetTranslationSettings() {
  return apiFetch('/api/settings/translation');
}

function apiSaveTranslationSettings(data) {
  return apiFetch('/api/settings/translation', { method: 'PUT', body: data });
}

function apiTranslate(data) {
  return apiFetch('/api/translate', { method: 'POST', body: data });
}

function apiAdminUsers() {
  return apiFetch('/api/admin/users');
}

function apiAdminCreateUser(data) {
  return apiFetch('/api/admin/users', { method: 'POST', body: data });
}

function apiAdminSetStatus(id, isActive) {
  return apiFetch('/api/admin/users/' + id + '/status', { method: 'PUT', body: { isActive: isActive } });
}

function apiAdminDeleteUser(id) {
  return apiFetch('/api/admin/users/' + id, { method: 'DELETE' });
}

function apiAdminResetPassword(id, password) {
  return apiFetch('/api/admin/users/' + id + '/password', { method: 'PUT', body: { password: password } });
}