// The single client-side entry-routing rule (SD-0001 §6.5). Exhaustive: every state lands
// somewhere (BUC-4 — never stranded). Fed by one server answer (GET /api/auth/me, or the
// verify response, which share this shape). storefront is always null in SLICE-2; SLICE-3
// makes "admin" reachable.
export interface SessionState {
  account: { email: string } | null;
  storefront: { id: number; name: string } | null;
}

export type Screen = "landing" | "create-storefront" | "admin";

export function routeFor(s: SessionState): Screen {
  if (!s.account) return "landing";
  if (!s.storefront) return "create-storefront";
  return "admin";
}