// frontend/lib/api.ts
export const API_BASE = process.env.NEXT_PUBLIC_API_BASE ?? (typeof window === "undefined" ? "http://localhost:31800" : "");

/** /api 프리픽스 경로를 절대 URL로. 예: apiUrl("/health") → http://localhost:31800/api/health */
export function apiUrl(path: string): string {
  const clean = path.startsWith("/") ? path : `/${path}`;
  return `${API_BASE}/api${clean}`;
}

/** 얇은 fetch 래퍼 — Phase 2 이후 본격 사용. Phase 0 스모크용 health 핑. */
export async function getJson<T>(path: string): Promise<T> {
  const res = await fetch(apiUrl(path), { headers: { Accept: "application/json" } });
  if (!res.ok) throw new Error(`GET ${path} → ${res.status}`);
  return res.json() as Promise<T>;
}