async function request(url, options = {}) {
  const response = await fetch(url, {
    ...options,
    headers: {
      'content-type': 'application/json',
      ...(options.headers || {}),
    },
  });
  const data = await response.json().catch(() => ({}));
  if (!response.ok || data?.success === false) {
    const error = new Error(data?.error || `Запрос ${url} завершился ошибкой ${response.status}`);
    error.status = response.status;
    throw error;
  }
  return data;
}

export const api = {
  state: () => request('/api/state'),
  subscription: {
    validate: (url, signal) => request('/api/subscription/validate', {
      method: 'POST',
      body: JSON.stringify({ url }),
      signal,
    }),
    fetch: (url) => request('/api/subscription/fetch', {
      method: 'POST',
      body: JSON.stringify({ url }),
    }),
    refresh: () => request('/api/subscription/refresh', { method: 'POST' }),
    forget: () => request('/api/subscription', { method: 'DELETE' }),
  },
  apply: (selectedTag) => request('/api/apply', {
    method: 'POST',
    body: JSON.stringify({ selectedTag }),
  }),
  gatewayAuto: {
    setEnabled: (enabled) => request('/api/gateway-auto', {
      method: 'POST',
      body: JSON.stringify({ enabled }),
    }),
  },
  singbox: {
    stop: () => request('/api/singbox/stop', { method: 'POST' }),
    restart: () => request('/api/singbox/restart', { method: 'POST' }),
  },
  servers: {
    pingAll: () => request('/api/servers/ping-all', { method: 'POST' }),
  },
};