/**
 * Centralized API configuration.
 * This setup allows the client to communicate with a backend server on a different domain,
 * which is necessary for the planned Hugging Face Space architecture where the client and server
 * are in separate spaces.
 */

// Use VITE_API_SERVER_URL from the .env file to specify the backend server URL.
// For local development, this can point to the local Python server (e.g., "http://127.0.0.1:8000").
// For production, this will be the URL of your private Hugging Face Space (e.g., "https://your-private-space.hf.space").
const API_BASE_URL = import.meta.env.VITE_API_SERVER_URL || "";

/**
 * Constructs a full URL for an API endpoint or a server-hosted resource.
 * If VITE_API_SERVER_URL is set, it prepends it to the path.
 * Otherwise, it returns the path as-is, assuming a same-origin request (useful for proxies).
 * @param {string} path - The relative path of the API endpoint (e.g., '/api/upload' or '/data/converted/.../tileset.json').
 * @returns {string} The full URL.
 */
export function getApiUrl(path) {
  // If the path is already a full URL, return it directly.
  if (path.startsWith("http://") || path.startsWith("https://")) {
    return path;
  }
  const formattedPath = path.startsWith("/") ? path : `/${path}`;
  return `${API_BASE_URL}${formattedPath}`;
}

/**
 * A wrapper for the native fetch function. This is a convenient place to inject
 * authentication headers or perform other request modifications in the future.
 * @param {string} url - The URL to fetch.
 * @param {object} options - The options for the fetch call.
 * @returns {Promise<Response>} The fetch promise.
 */
export function fetchWithAuth(url, options) {
  // Future logic for adding auth tokens can go here.
  return fetch(url, options);
}