const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:4000';

export async function apiFetch<T = unknown>(path: string, init: RequestInit = {}): Promise<T> {
  const res = await fetch(`${API_BASE}${path}`, {
    credentials: 'include',
    cache: 'no-store',
    ...init,
    headers: {
      'Content-Type': 'application/json',
      ...(init.headers ?? {}),
    },
  });
  if (!res.ok) {
    let detail: unknown = undefined;
    try {
      detail = await res.json();
    } catch {}
    const err = new Error(`api_error_${res.status}`);
    (err as unknown as { detail?: unknown }).detail = detail;
    (err as unknown as { status?: number }).status = res.status;
    throw err;
  }
  return (await res.json()) as T;
}

/** Absolute API URL for a path — use for full-page navigations (OAuth redirects). */
export function apiUrl(path: string): string {
  return `${API_BASE}${path}`;
}

export function apiWebSocketURL(path: string): string {
  const httpBase = API_BASE;
  const wsBase = httpBase.replace(/^http/, 'ws');
  return `${wsBase}${path}`;
}