export const API_BASE = (process.env.NEXT_PUBLIC_API_BASE_URL || "").replace(/\/$/, "");

export function apiUrl(path: string): string {
  if (/^https?:\/\//i.test(path)) return path;
  const normalizedPath = path.startsWith("/") ? path : `/${path}`;
  if (API_BASE.endsWith("/api") && normalizedPath.startsWith("/api/")) {
    return `${API_BASE}${normalizedPath.slice(4)}`;
  }
  return `${API_BASE}${normalizedPath}`;
}

export async function apiFetch<T>(
  path: string,
  init?: RequestInit
): Promise<T> {
  const res = await fetch(apiUrl(path), {
    credentials: "include",
    ...init,
    headers:
      init?.body instanceof FormData
        ? init.headers
        : {
            "Content-Type": "application/json",
            ...(init?.headers || {}),
          },
  });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    throw new Error(data?.detail || data?.error || `HTTP ${res.status}`);
  }
  return data as T;
}