scrabble-game/ui/src/lib/lobbycache.ts

// In-memory lobby snapshot, the lobby counterpart of gamecache.ts. The lobby re-fetches
// its lists on every entry, so without a cache the screen renders blank and "draws in"
// during the back-slide from a game. Caching the last lists lets the lobby render
// instantly (before/under the transition) and refresh in the background. Process-memory
// only; cleared on logout.

import type { AccountRef, GameView, Invitation } from './model';

interface LobbySnapshot {
  games: GameView[];
  invitations: Invitation[];
  incoming: AccountRef[];
}

let snapshot: LobbySnapshot | null = null;

/** getLobby returns the last lobby lists, or null before the first load. */
export function getLobby(): LobbySnapshot | null {
  return snapshot;
}

/** setLobby stores the latest lobby lists. */
export function setLobby(s: LobbySnapshot): void {
  snapshot = s;
}

/** clearLobby drops the cached lobby (called on logout). */
export function clearLobby(): void {
  snapshot = null;
}