const API_BASE = '/api';

export class ApiError extends Error {
  constructor(
    public status: number,
    public body: string,
  ) {
    super(`API ${status}: ${body}`);
  }
}

export async function api<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${API_BASE}${path}`, {
    credentials: 'include',
    ...init,
    headers: {
      'content-type': 'application/json',
      ...(init?.headers ?? {}),
    },
  });
  if (!res.ok) throw new ApiError(res.status, await res.text());
  return (await res.json()) as T;
}