// 📦 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
  async function storeDirectoryHandle(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
  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 = () => reject(getRequest.error);
    });
  }
  
  // 🔐 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;
  }
  
  // 🧠 List contents of a directory
  async function listDirectoryContents(dirHandle) {
    for await (const [name, handle] of dirHandle.entries()) {
      console.log(`${handle.kind === 'file' ? '📄' : '📁'} ${name}`);
    }
  }
  
  // 📌 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.');
    }
  }
  
  // 🚀 Main logic
  export default async function initDirectoryAccess() {
    await ensurePersistentStorage();
  
    let handle = await getDirectoryHandle();
  
    if (!handle || !(await verifyPermission(handle))) {
      handle = await window.showDirectoryPicker();
      if (await verifyPermission(handle)) {
        await storeDirectoryHandle(handle);
      } else {
        console.warn('Permission denied for selected directory.');
        return;
      }
    }
  
    console.log('📂 Directory handle ready. Listing contents:');
    await listDirectoryContents(handle);
  }