import { useRef } from 'react';
import { getAssets } from '../../../../lib/api';
import type { Asset } from '../../../../lib/types';

/** Shared, lazily-populated asset list (used by autocomplete + upload). */
export function useAssetCache() {
  const cacheRef = useRef<Asset[] | null>(null);

  async function getCachedAssets(): Promise<Asset[]> {
    if (cacheRef.current) return cacheRef.current;
    const assets = await getAssets();
    cacheRef.current = assets;
    return assets;
  }

  // Mirrors the original behaviour: prepend only if the cache is already
  // warm; if it's cold, leave it null so the next read refetches.
  function prepend(newAssets: Asset[]) {
    if (newAssets.length === 0) return;
    cacheRef.current = cacheRef.current ? [...newAssets, ...cacheRef.current] : null;
  }

  function invalidate() {
    cacheRef.current = null;
  }

  return { getCachedAssets, prepend, invalidate };
}