/** Participant SPA host — never marketing apex (eventbuzz.live). */
function eventbuzzPublicBase(): string {
  const fromEnv =
    (typeof import.meta.env.VITE_EVENTBUZZ_PUBLIC_URL === "string" &&
      import.meta.env.VITE_EVENTBUZZ_PUBLIC_URL.trim()) ||
    "";
  const raw = (fromEnv || (import.meta.env.DEV ? "http://localhost:5174" : "https://join.eventbuzz.live")).replace(
    /\/+$/,
    "",
  );
  try {
    const u = new URL(raw);
    if (u.hostname === "eventbuzz.live" || u.hostname === "www.eventbuzz.live") {
      u.hostname = "join.eventbuzz.live";
      return u.origin;
    }
  } catch {
    /* keep raw */
  }
  return raw;
}

export function aiAvatarVisitorUrl(uploadToken: string): string {
  const base = eventbuzzPublicBase();
  return `${base}/ai-avatar/${encodeURIComponent(uploadToken)}`;
}