/** 全局认证 fetch 客户端 */

let tokenGetter: () => string | null = () => null;

export function setTokenGetter(fn: () => string | null) {
  tokenGetter = fn;
}

export async function fetchJson<T>(url: string, options?: RequestInit): Promise<T> {
  const token = tokenGetter();
  const res = await fetch(url, {
    ...options,
    headers: {
      ...options?.headers,
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
    },
  });
  if (res.status === 401) {
    window.dispatchEvent(new CustomEvent('auth:unauthorized'));
    throw new Error('Unauthorized');
  }
  if (!res.ok) throw new Error(`API error: ${res.status} ${res.statusText}`);
  return res.json();
}