// Module-level memo of decrypted-attachment data URLs by handle id.
// Survives screen unmounts (e.g. user pops in and out of a conversation)
// but evicts on app restart — good enough for Phase 2; an LRU + disk
// cache is a later polish.

const cache = new Map<string, string>();

export function getCachedAttachment(id: string): string | undefined {
  return cache.get(id);
}

export function setCachedAttachment(id: string, dataUrl: string): void {
  cache.set(id, dataUrl);
}

export function clearAttachmentCache(): void {
  cache.clear();
}