/**
 * Wrapper around fetch that prepends the Next.js basePath so API calls
 * reach the correct backend when deployed under a sub-path (/ppt-tool).
 *
 * Must match basePath in next.config.mjs.
 * Usage: apiFetch('/api/v1/...', options)  — identical to fetch(), just works.
 */
const BASE_PATH = '/ppt-tool';

const PREFIXED_PATHS = ['/api/', '/app_data/', '/static/'];

function needsBasePath(path: string): boolean {
  return PREFIXED_PATHS.some((p) => path.startsWith(p));
}

export function apiFetch(path: string, init?: RequestInit): Promise<Response> {
  const url = needsBasePath(path) ? `${BASE_PATH}${path}` : path;
  return fetch(url, init);
}

/** Returns the full URL with basePath — use for EventSource and other non-fetch calls. */
export function apiUrl(path: string): string {
  return needsBasePath(path) ? `${BASE_PATH}${path}` : path;
}