// 📦 IndexedDB Helper
function openDB() {
  return new Promise((resolve, reject) => {
    const request = indexedDB.open('directory-handle-db', 1);
    request.onupgradeneeded = () => {
      request.result.createObjectStore('handles');
    };
    request.onsuccess = () => resolve(request.result);
    request.onerror = () => reject(request.error);
  });
}

// 💾 Store a directory handle
export async function setDirectoryHandle(handle) {
  const db = await openDB();
  const tx = db.transaction('handles', 'readwrite');
  tx.objectStore('handles').put(handle, 'my-folder');
  await tx.done;
}

// 📂 Retrieve a directory handle
export async function getDirectoryHandle() {
  const db = await openDB();
  const tx = db.transaction('handles', 'readonly');
  return new Promise((resolve, reject) => {
    const getRequest = tx.objectStore('handles').get('my-folder');
    getRequest.onsuccess = () => resolve(getRequest.result);
    getRequest.onerror = () => {
      console.error('Error retrieving directory handle:', getRequest.error);
      return resolve(false);
    }
  });
}

// 🔐 Check or request permission
async function verifyPermission(handle, mode = 'readwrite') {
  const opts = { mode };
  if ((await handle.queryPermission(opts)) === 'granted') return true;
  if ((await handle.requestPermission(opts)) === 'granted') return true;
  return false;
}


// 📌 Request persistent storage
async function ensurePersistentStorage() {
  if (navigator.storage && navigator.storage.persist) {
    const granted = await navigator.storage.persist();
    console.log(granted
      ? '✅ Persistent storage granted.'
      : '⚠️ Storage may be cleared under pressure.');
  }
}