// Where the SPA reaches the Fastify backend.
//
// In a browser (dev via the Vite proxy, or prod where Fastify serves the built
// SPA) this is EMPTY — requests stay relative (`/api/...`) and same-origin, so
// nothing changes. The Tauri desktop shell (apps/desktop) serves the bundled
// SPA from `tauri://localhost`, which has no backend and no proxy; there we set
// VITE_API_BASE to the appliance's Fastify origin (e.g. http://127.0.0.1:3000)
// at build time so /api and the live WS feed resolve to the real server.
//
// Keep this the SINGLE source for the backend origin — api.ts and the live-feed
// WebSocket both read it, so the web app and the desktop shell stay identical
// except for this one build-time value.

/** Backend HTTP origin, no trailing slash. Empty string = same-origin/relative. */
export const API_BASE: string = (import.meta.env.VITE_API_BASE ?? "").replace(/\/$/, "");

/** Resolve an API path to a full URL (or a relative path when API_BASE is empty). */
export function apiUrl(path: string): string {
  return API_BASE ? `${API_BASE}${path}` : path;
}

/** Build the ws:// or wss:// URL for the backend's live feed. Uses API_BASE when
 *  set (Tauri), else the page origin (browser). */
export function wsUrl(path: string): string {
  if (API_BASE) {
    return `${API_BASE.replace(/^http/, "ws")}${path}`;
  }
  const proto = window.location.protocol === "https:" ? "wss:" : "ws:";
  return `${proto}//${window.location.host}${path}`;
}