const BASE =
  (import.meta.env.VITE_API_BASE as string | undefined) || "/api";
export const API_BASE = BASE.replace(/\/$/, "");

async function parseError(res: Response): Promise<string> {
  try {
    const data = await res.json();
    return data?.detail || res.statusText;
  } catch {
    return res.statusText;
  }
}

export async function request<T>(
  path: string,
  options: RequestInit = {},
): Promise<T> {
  const url = `${API_BASE}${path}`;
  const res = await fetch(url, {
    credentials: "same-origin",
    ...options,
  });
  if (!res.ok) {
    throw new Error(await parseError(res));
  }
  if (res.status === 204) return null as T;
  const contentType = res.headers.get("content-type") || "";
  if (contentType.includes("application/json")) {
    return (await res.json()) as T;
  }
  return (await res.text()) as T;
}

export async function postForm<T>(path: string, data: FormData): Promise<T> {
  return request<T>(path, { method: "POST", body: data });
}

export async function postJson<T>(
  path: string,
  body: unknown,
): Promise<T> {
  return request<T>(path, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
}

export async function putJson<T>(path: string, body: unknown): Promise<T> {
  return request<T>(path, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
}