feat(router): instrada in sottocartella A/M_B e ottimizza cache destinazione

- Router: aggiunge campo `subfolder` a getCadInfo (91xxxxx → A, 92xxxxx → M_B);
  getDestinationDecision appende la sottocartella al percorso finale
- Scanner (fast path): legge A e M_B dentro ogni cartella a 3 cifre per
  il rilevamento duplicati, anziché la cartella a 3 cifre stessa
- Cache: persistenza su disco del folderIndex; cadKeyIndex sempre fresco
- isCacheStillValid: validazione a due livelli (top-level + cartelle a 3
  cifre) — rileva automaticamente nuove cartelle aggiunte da colleghi
- UI: rimosso pulsante "Riscansiona destinazione"; gestione cache completamente
  automatica e trasparente per l'utente

README.md

@@ -47,8 +47,8 @@ Gli artefatti vengono generati in `dist/`.
 | `__DUPLICATI` | File CAD già presenti in destinazione |
 | `__SALTATI` | File non CAD (PDF, immagini, ecc.) |
 
+- **Windows:** `C:\cadroute\<cartella>\`
 - **Linux:** `~/.cadroute/<cartella>/`
-- **Windows:** `%APPDATA%\CadRoute\<cartella>\`
 
 ## Autore
 

main.js

@@ -4,6 +4,7 @@ const fs = require('fs-extra');
 
 const { processFolder } = require('./services/folderProcessor');
 const { processZip } = require('./services/zipProcessor');
+const { setCacheDir, clearCache } = require('./services/destinationScanner');
 const {
   resolveUnroutedDir,
   listUnroutedFiles,
@@ -127,6 +128,7 @@ Menu.setApplicationMenu(Menu.buildFromTemplate([
 
 app.whenReady().then(async () => {
   await ensureRuntimeDirectory();
+  setCacheDir(getRuntimeDirectory());
   const persistedDestination = await loadPersistedDestination();
   config = buildConfig(persistedDestination);
   createWindow();
@@ -142,7 +144,7 @@ app.on('window-all-closed', () => {
   if (process.platform !== 'darwin') app.quit();
 });
 
-ipcMain.handle('select-folder', async () => {
+ipcMain.handle('select-folder', async (event) => {
   const result = await dialog.showOpenDialog({
     properties: ['openDirectory'],
   });
@@ -151,11 +153,12 @@ ipcMain.handle('select-folder', async () => {
     return { canceled: true };
   }
 
-  const routingResult = await processFolder(result.filePaths[0], config);
+  const onProgress = (data) => event.sender.send('progress', data);
+  const routingResult = await processFolder(result.filePaths[0], config, onProgress);
   return { canceled: false, ...routingResult };
 });
 
-ipcMain.handle('select-zip', async () => {
+ipcMain.handle('select-zip', async (event) => {
   const result = await dialog.showOpenDialog({
     properties: ['openFile'],
     filters: [{ name: 'Zip', extensions: ['zip'] }],
@@ -165,11 +168,12 @@ ipcMain.handle('select-zip', async () => {
     return { canceled: true };
   }
 
-  const routingResult = await processZip(result.filePaths[0], config);
+  const onProgress = (data) => event.sender.send('progress', data);
+  const routingResult = await processZip(result.filePaths[0], config, onProgress);
   return { canceled: false, ...routingResult };
 });
 
-ipcMain.handle('process-dropped-path', async (_event, payload) => {
+ipcMain.handle('process-dropped-path', async (event, payload) => {
   const droppedPath = String(payload?.path || '').trim();
   if (!droppedPath) {
     throw new Error('Percorso non valido');
@@ -180,13 +184,15 @@ ipcMain.handle('process-dropped-path', async (_event, payload) => {
     throw new Error('Percorso non trovato');
   }
 
+  const onProgress = (data) => event.sender.send('progress', data);
+
   if (stats.isDirectory()) {
-    const routingResult = await processFolder(droppedPath, config);
+    const routingResult = await processFolder(droppedPath, config, onProgress);
     return { canceled: false, sourceType: 'folder', ...routingResult };
   }
 
   if (stats.isFile() && path.extname(droppedPath).toLowerCase() === '.zip') {
-    const routingResult = await processZip(droppedPath, config);
+    const routingResult = await processZip(droppedPath, config, onProgress);
     return { canceled: false, sourceType: 'zip', ...routingResult };
   }
 
@@ -220,9 +226,11 @@ ipcMain.handle('update-destination', async (_event, payload) => {
 
   config = buildConfig(destination);
   await persistDestination(config.destination);
+  await clearCache();
   return { destination: config.destination };
 });
 
+
 ipcMain.handle('open-unrouted-folder', async () => {
   const unroutedDir = await resolveUnroutedDir();
   const openResult = await shell.openPath(unroutedDir);

preload.js

@@ -15,4 +15,6 @@ contextBridge.exposeInMainWorld('api', {
   clearUnroutedFiles: () => ipcRenderer.invoke('clear-unrouted-files'),
   clearDuplicatesFiles: () => ipcRenderer.invoke('clear-duplicates-files'),
   clearSkippedFiles: () => ipcRenderer.invoke('clear-skipped-files'),
+  onProgress: (cb) => ipcRenderer.on('progress', (_e, data) => cb(data)),
+  offProgress: () => ipcRenderer.removeAllListeners('progress'),
 });

renderer/docs/index.html

@@ -27,6 +27,7 @@
       <a href="#nomi">Convenzione nomi file</a>
       <a href="#nonsmistati">File non smistati</a>
       <a href="#duplicati">File duplicati</a>
+      <a href="#saltati">File saltati</a>
     </nav>
 
     <main>
@@ -62,7 +63,7 @@
             <tr>
               <td><span class="badge skip">altri</span></td>
               <td>—</td>
-              <td>Ignorati (PDF, immagini, documenti, ecc.)</td>
+              <td>Copiati in <code>__SALTATI</code> (PDF, immagini, documenti, ecc.)</td>
             </tr>
           </tbody>
         </table>
@@ -100,7 +101,7 @@
         <ol class="steps">
           <li><span>Clicca <strong>Process Folder</strong> per selezionare una cartella, oppure <strong>Process ZIP</strong> per selezionare un archivio. In alternativa, trascina la cartella o il file <code>.zip</code> nell'area tratteggiata.</span></li>
           <li><span>L'app scansiona tutti i file e identifica automaticamente quelli CAD.</span></li>
-          <li><span>I file CAD vengono copiati nella sottocartella di destinazione corrispondente. I file non CAD vengono saltati.</span></li>
+          <li><span>I file CAD vengono copiati nella sottocartella di destinazione corrispondente. I file non CAD vengono copiati in <code>__SALTATI</code>.</span></li>
           <li><span>Al termine vengono mostrate le statistiche nell'area di output.</span></li>
         </ol>
 
@@ -127,7 +128,7 @@
           </div>
           <div class="stat-item muted">
             <div class="stat-label">Saltati</div>
-            <div class="stat-desc">File ignorati perché non CAD (PDF, immagini, ecc.).</div>
+            <div class="stat-desc">File non CAD copiati in <code>__SALTATI</code> (PDF, immagini, ecc.).</div>
           </div>
           <div class="stat-item warn">
             <div class="stat-label">Non smistati</div>
@@ -172,7 +173,7 @@ Esempi:
             </tr>
             <tr>
               <td>File già presente in destinazione</td>
-              <td>Copiato in <code>duplicati/</code> per revisione</td>
+              <td>Copiato in <code>__DUPLICATI</code> per revisione</td>
             </tr>
             <tr>
               <td>Versione inferiore presente nella sorgente</td>
@@ -210,8 +211,8 @@ Esempi:
         <h3>Dove si trovano</h3>
         <p>I file non smistati vengono copiati nella cartella <code>__NON_SMISTATI</code>:</p>
         <ul style="margin: 8px 0 12px 20px; color: var(--muted);">
+          <li><strong>Windows:</strong> <code>C:\cadroute\__NON_SMISTATI\</code></li>
           <li><strong>Linux:</strong> <code>~/.cadroute/__NON_SMISTATI/</code></li>
-          <li><strong>Windows:</strong> <code>%APPDATA%\CadRoute\__NON_SMISTATI\</code></li>
         </ul>
 
         <h3>Visualizzare e pulire</h3>
@@ -231,16 +232,16 @@ Esempi:
         <h2>File duplicati</h2>
         <p>Un file CAD viene classificato come <strong>duplicato</strong> quando la sua chiave (<code>CODICE.tipo</code>, senza versione) è già presente nella cartella di destinazione al momento dello smistamento.</p>
 
-        <p>I duplicati non sovrascrivono i file già presenti in destinazione: vengono messi da parte nella cartella <code>duplicati/</code> per permettere una revisione manuale.</p>
+        <p>I duplicati non sovrascrivono i file già presenti in destinazione: vengono messi da parte nella cartella <code>__DUPLICATI</code> per permettere una revisione manuale.</p>
 
         <h3>Dove si trovano</h3>
         <ul style="margin: 8px 0 12px 20px; color: var(--muted);">
-          <li><strong>Linux:</strong> <code>~/.cadroute/duplicati/</code></li>
+          <li><strong>Windows:</strong> <code>C:\cadroute\__DUPLICATI\</code></li>
-          <li><strong>Windows:</strong> <code>%APPDATA%\CadRoute\duplicati\</code></li>
+          <li><strong>Linux:</strong> <code>~/.cadroute/__DUPLICATI/</code></li>
         </ul>
 
         <h3>Gestione versioni nei duplicati</h3>
-        <p>Anche all'interno della cartella <code>duplicati/</code> viene applicata la logica delle versioni: se arriva una versione più alta di un file già presente nei duplicati, la versione vecchia viene eliminata e sostituita con quella nuova.</p>
+        <p>Anche all'interno della cartella <code>__DUPLICATI</code> viene applicata la logica delle versioni: se arriva una versione più alta di un file già presente nei duplicati, la versione vecchia viene eliminata e sostituita con quella nuova.</p>
 
         <h3>Visualizzare e pulire</h3>
         <ol class="steps">
@@ -254,6 +255,31 @@ Esempi:
         </div>
       </section>
 
+      <!-- ── SALTATI ────────────────────────────── -->
+      <section id="saltati">
+        <h2>File saltati</h2>
+        <p>Un file viene classificato come <strong>saltato</strong> quando non è riconosciuto come file CAD, cioè non ha estensione <code>.prt</code>, <code>.asm</code> o <code>.drw</code>. Rientrano in questa categoria PDF, immagini, documenti Word e qualsiasi altro formato non CAD.</p>
+
+        <p>I file saltati non vengono ignorati completamente: vengono copiati nella cartella <code>__SALTATI</code> per permettere una verifica manuale.</p>
+
+        <h3>Dove si trovano</h3>
+        <ul style="margin: 8px 0 12px 20px; color: var(--muted);">
+          <li><strong>Windows:</strong> <code>C:\cadroute\__SALTATI\</code></li>
+          <li><strong>Linux:</strong> <code>~/.cadroute/__SALTATI/</code></li>
+        </ul>
+
+        <h3>Visualizzare e pulire</h3>
+        <ol class="steps">
+          <li><span>Clicca <strong>Anteprima saltati</strong> per aprire la lista dei file presenti.</span></li>
+          <li><span>Verifica che nessun file CAD sia finito qui per errore di denominazione.</span></li>
+          <li><span>Se vuoi svuotare la cartella, clicca <strong>Pulisci cartella</strong> (rosso) e conferma.</span></li>
+        </ol>
+
+        <div class="callout info">
+          <strong>Nota:</strong> la cartella <code>__SALTATI</code> è utile per individuare file CAD rinominati erroneamente o con estensione mancante.
+        </div>
+      </section>
+
     </main>
 
     <script>

renderer/index.html

@@ -254,6 +254,53 @@
         overflow: auto;
         min-height: 180px;
       }
+
+      .progress-container {
+        margin-top: 18px;
+        display: none;
+      }
+
+      .progress-label {
+        font-size: 13px;
+        color: var(--muted);
+        margin-bottom: 6px;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+      }
+
+      progress {
+        width: 100%;
+        height: 6px;
+        border-radius: 4px;
+        border: none;
+        appearance: none;
+        -webkit-appearance: none;
+        background: var(--border);
+        overflow: hidden;
+      }
+
+      progress::-webkit-progress-bar {
+        background: var(--border);
+        border-radius: 4px;
+      }
+
+      progress::-webkit-progress-value {
+        background: var(--accent);
+        border-radius: 4px;
+        transition: width 80ms ease;
+      }
+
+      progress:indeterminate {
+        background: linear-gradient(90deg, var(--border) 25%, var(--accent) 50%, var(--border) 75%);
+        background-size: 200% 100%;
+        animation: progress-indeterminate 1.2s linear infinite;
+      }
+
+      @keyframes progress-indeterminate {
+        0%   { background-position: 100% 0; }
+        100% { background-position: -100% 0; }
+      }
     </style>
   </head>
   <body>
@@ -270,6 +317,11 @@
         Trascina qui una cartella o un file .zip
       </section>
 
+      <div class="progress-container" id="progressContainer">
+        <div class="progress-label" id="progressLabel">In corso...</div>
+        <progress id="progressBar"></progress>
+      </div>
+
       <section class="rules">
         <h2>Destinazione file CAD</h2>
         <div class="rule-row single-row">

renderer/renderer.js

@@ -15,10 +15,61 @@ const clearPreviewBtn = document.getElementById('clearPreviewBtn');
 const previewTitle = document.getElementById('previewTitle');
 const previewMeta = document.getElementById('previewMeta');
 const previewList = document.getElementById('previewList');
+const progressContainer = document.getElementById('progressContainer');
+const progressBar = document.getElementById('progressBar');
+const progressLabel = document.getElementById('progressLabel');
 const defaultDropZoneText = 'Trascina qui una cartella o un file .zip';
 let isProcessing = false;
 let currentPreviewKind = null;
 
+function showProgress() {
+  progressContainer.style.display = 'block';
+  progressBar.removeAttribute('value');
+  progressLabel.textContent = 'In corso...';
+}
+
+function hideProgress() {
+  progressContainer.style.display = 'none';
+}
+
+let _indexFilesFound = 0;
+
+function updateProgress({ phase, current, total, file, scanned, folder }) {
+  if (phase === 'index-cache') {
+    // folderIndex dalla cache — avvia scansione veloce dei file
+    progressBar.max = total || 1;
+    progressBar.value = 0;
+    progressLabel.textContent = 'Struttura dalla cache — ricerca file CAD in corso...';
+    return;
+  } else if (phase === 'scan') {
+    _indexFilesFound = 0;
+    progressLabel.textContent = 'Scansione file sorgente...';
+    progressBar.removeAttribute('value');
+  } else if (phase === 'index-dest') {
+    // scansione completa (nessuna cache)
+    progressBar.max = total;
+    progressBar.value = current;
+    const filesInfo = _indexFilesFound > 0 ? `  —  ${_indexFilesFound} file CAD trovati` : '';
+    progressLabel.textContent = `Analisi destinazione: ${current} / ${total}${folder ? `  —  ${folder}` : ''}${filesInfo}`;
+  } else if (phase === 'index-dup') {
+    if (current !== undefined && total !== undefined) {
+      // scansione veloce (cache attiva): current/total = cartelle processate
+      progressBar.max = total;
+      progressBar.value = current;
+      progressLabel.textContent = `Ricerca file CAD: ${current} / ${total} cartelle`;
+    } else {
+      // scansione completa: scanned = contatore file trovati
+      _indexFilesFound = scanned;
+      const dirInfo = progressBar.max > 0 ? `${progressBar.value} / ${progressBar.max}  —  ` : '';
+      progressLabel.textContent = `Analisi destinazione: ${dirInfo}${scanned} file CAD trovati`;
+    }
+  } else if (phase === 'copy') {
+    progressBar.max = total;
+    progressBar.value = current;
+    progressLabel.textContent = `Smistamento: ${current} / ${total}${file ? `  —  ${file}` : ''}`;
+  }
+}
+
 function setLoading(isLoading) {
   folderBtn.disabled = isLoading;
   zipBtn.disabled = isLoading;
@@ -101,6 +152,8 @@ async function handleAction(actionName, actionFn) {
 
   isProcessing = true;
   setLoading(true);
+  showProgress();
+  window.api.onProgress(updateProgress);
   output.textContent = `${actionName} in corso...`;
 
   try {
@@ -115,6 +168,8 @@ async function handleAction(actionName, actionFn) {
   } catch (error) {
     output.textContent = `${actionName} fallito:\n${error.message}`;
   } finally {
+    window.api.offProgress();
+    hideProgress();
     setLoading(false);
     isProcessing = false;
   }
@@ -309,6 +364,7 @@ clearPreviewBtn.addEventListener('click', async () => {
   }
 });
 
+
 closePreviewBtn.addEventListener('click', hidePreview);
 previewOverlay.addEventListener('click', (event) => {
   if (event.target === previewOverlay) {

services/destinationIndex.js

@@ -4,13 +4,15 @@ const path = require('path');
 const CODE_FOLDER_REGEX = /^\d{3}$/;
 const MAX_SCAN_DEPTH = 6;
 
-async function buildDestinationIndex(destinationRoot) {
+async function buildDestinationIndex(destinationRoot, onProgress) {
   const index = new Map();
 
   if (!destinationRoot || !(await fs.pathExists(destinationRoot))) {
     return index;
   }
 
+  let scanned = 0;
+
   async function walk(currentDir, depth) {
     if (depth > MAX_SCAN_DEPTH) {
       return;
@@ -29,6 +31,9 @@ async function buildDestinationIndex(destinationRoot) {
       }
 
       const fullPath = path.join(currentDir, entry.name);
+      scanned += 1;
+      onProgress?.({ phase: 'index-dest', scanned, folder: entry.name });
+
       if (CODE_FOLDER_REGEX.test(entry.name)) {
         const rows = index.get(entry.name) || [];
         rows.push(fullPath);

services/destinationScanner.js

@@ -0,0 +1,264 @@
+const fs = require('fs-extra');
+const path = require('path');
+const { getCadInfo } = require('./router');
+
+const CODE_FOLDER_REGEX = /^\d{3}$/;
+const MAX_SCAN_DEPTH = 6;
+const CACHE_FILENAME = 'dest-index.cache.json';
+
+let _cacheDir = null;
+
+function setCacheDir(dir) {
+  _cacheDir = dir;
+}
+
+function toCadKey(cadInfo) {
+  return String(cadInfo?.key || '').toLowerCase();
+}
+
+function getCacheFilePath() {
+  return _cacheDir ? path.join(_cacheDir, CACHE_FILENAME) : null;
+}
+
+// ── Cache su disco (solo folderIndex — struttura cartelle) ─────────────────
+
+async function tryLoadFolderIndexCache(destinationRoot) {
+  const cacheFile = getCacheFilePath();
+  if (!cacheFile) return null;
+
+  try {
+    const raw = await fs.readJson(cacheFile);
+    if (raw?.destination !== destinationRoot) return null;
+    return { folderIndex: new Map(raw.folderIndex || []), savedAt: raw.savedAt };
+  } catch {
+    return null;
+  }
+}
+
+async function saveFolderIndexCache(destinationRoot, folderIndex) {
+  const cacheFile = getCacheFilePath();
+  if (!cacheFile) return;
+  try {
+    await fs.writeJson(cacheFile, {
+      destination: destinationRoot,
+      savedAt: new Date().toISOString(),
+      folderIndex: [...folderIndex.entries()],
+    });
+  } catch {
+    // cache non critica
+  }
+}
+
+async function clearCache() {
+  const cacheFile = getCacheFilePath();
+  if (!cacheFile) return;
+  try {
+    await fs.remove(cacheFile);
+  } catch {
+    // ignora
+  }
+}
+
+// ── Scansione completa (folderIndex + cadKeyIndex in un unico passaggio) ───
+
+async function fullScan(destinationRoot, onProgress) {
+  const folderIndex = new Map();
+  const cadKeyIndex = new Set();
+
+  if (!destinationRoot || !(await fs.pathExists(destinationRoot))) {
+    return { folderIndex, cadKeyIndex };
+  }
+
+  let topEntries;
+  try {
+    topEntries = await fs.readdir(destinationRoot, { withFileTypes: true });
+  } catch {
+    return { folderIndex, cadKeyIndex };
+  }
+
+  const topDirs = topEntries
+    .filter((e) => e.isDirectory())
+    .map((e) => ({ name: e.name, fullPath: path.join(destinationRoot, e.name) }));
+
+  const total = topDirs.length;
+  let completed = 0;
+  let scannedFiles = 0;
+
+  for (const entry of topEntries) {
+    if (!entry.isFile()) continue;
+    const cadInfo = getCadInfo(entry.name);
+    if (cadInfo) {
+      scannedFiles += 1;
+      cadKeyIndex.add(toCadKey(cadInfo));
+    }
+  }
+
+  async function walkSubtree(dirPath, depth) {
+    if (depth > MAX_SCAN_DEPTH) return;
+
+    let entries;
+    try {
+      entries = await fs.readdir(dirPath, { withFileTypes: true });
+    } catch {
+      return;
+    }
+
+    const subdirPromises = [];
+
+    for (const entry of entries) {
+      const fullPath = path.join(dirPath, entry.name);
+
+      if (entry.isDirectory()) {
+        if (CODE_FOLDER_REGEX.test(entry.name)) {
+          const rows = folderIndex.get(entry.name) || [];
+          rows.push(fullPath);
+          folderIndex.set(entry.name, rows);
+        }
+        subdirPromises.push(walkSubtree(fullPath, depth + 1));
+      } else if (entry.isFile()) {
+        const cadInfo = getCadInfo(entry.name);
+        if (cadInfo) {
+          scannedFiles += 1;
+          onProgress?.({ phase: 'index-dup', scanned: scannedFiles, file: entry.name });
+          cadKeyIndex.add(toCadKey(cadInfo));
+        }
+      }
+    }
+
+    await Promise.all(subdirPromises);
+  }
+
+  await Promise.all(
+    topDirs.map(async ({ name, fullPath }) => {
+      onProgress?.({ phase: 'index-dest', current: completed, total, folder: name });
+
+      if (CODE_FOLDER_REGEX.test(name)) {
+        const rows = folderIndex.get(name) || [];
+        rows.push(fullPath);
+        folderIndex.set(name, rows);
+      }
+
+      await walkSubtree(fullPath, 1);
+
+      completed += 1;
+      onProgress?.({ phase: 'index-dest', current: completed, total, folder: name });
+    })
+  );
+
+  return { folderIndex, cadKeyIndex };
+}
+
+// ── Scansione veloce dei file (usa il folderIndex già noto dalla cache) ────
+//
+// Invece di traversare l'intero albero, legge direttamente SOLO le cartelle
+// a 3 cifre già note. Questo riduce drasticamente le chiamate readdir su SMB.
+
+async function scanCadKeysFromFolderIndex(folderIndex, onProgress) {
+  const cadKeyIndex = new Set();
+  const allFolderPaths = [...folderIndex.values()].flat();
+  const total = allFolderPaths.length;
+  let completed = 0;
+
+  await Promise.all(
+    allFolderPaths.map(async (folderPath) => {
+      for (const sub of ['A', 'M_B']) {
+        const subPath = path.join(folderPath, sub);
+        let entries;
+        try {
+          entries = await fs.readdir(subPath, { withFileTypes: true });
+        } catch {
+          continue;
+        }
+        for (const entry of entries) {
+          if (!entry.isFile()) continue;
+          const cadInfo = getCadInfo(entry.name);
+          if (cadInfo) {
+            cadKeyIndex.add(toCadKey(cadInfo));
+          }
+        }
+      }
+
+      completed += 1;
+      onProgress?.({ phase: 'index-dup', current: completed, total });
+    })
+  );
+
+  return cadKeyIndex;
+}
+
+// ── Entry point ────────────────────────────────────────────────────────────
+
+async function isCacheStillValid(destinationRoot, cached) {
+  // Controlla le cartelle top-level E le cartelle a 3 cifre al loro interno.
+  // Costa 1 + N_top_level readdir — rileva nuove cartelle aggiunte da colleghi.
+  let currentEntries;
+  try {
+    currentEntries = await fs.readdir(destinationRoot, { withFileTypes: true });
+  } catch {
+    return false;
+  }
+
+  const currentDirNames = new Set(
+    currentEntries.filter((e) => e.isDirectory()).map((e) => e.name)
+  );
+
+  // Ricostruisce: topLevelDir → Set<group> dalla cache
+  const cachedGroupsByTopDir = new Map();
+  for (const [group, paths] of cached.folderIndex.entries()) {
+    for (const p of paths) {
+      const topDir = path.relative(destinationRoot, p).split(path.sep)[0];
+      if (!cachedGroupsByTopDir.has(topDir)) cachedGroupsByTopDir.set(topDir, new Set());
+      cachedGroupsByTopDir.get(topDir).add(group);
+    }
+  }
+
+  const cachedDirNames = new Set(cachedGroupsByTopDir.keys());
+
+  // Controlla top-level
+  for (const name of currentDirNames) {
+    if (!cachedDirNames.has(name)) return false;
+  }
+  for (const name of cachedDirNames) {
+    if (!currentDirNames.has(name)) return false;
+  }
+
+  // Controlla cartelle a 3 cifre dentro ogni top-level (solo nuove aggiunte)
+  for (const topDir of currentDirNames) {
+    let subEntries;
+    try {
+      subEntries = await fs.readdir(path.join(destinationRoot, topDir), { withFileTypes: true });
+    } catch {
+      return false;
+    }
+    const cachedGroups = cachedGroupsByTopDir.get(topDir) || new Set();
+    for (const e of subEntries) {
+      if (e.isDirectory() && CODE_FOLDER_REGEX.test(e.name) && !cachedGroups.has(e.name)) {
+        return false; // nuova cartella a 3 cifre rilevata
+      }
+    }
+  }
+
+  return true;
+}
+
+async function buildDestinationIndexes(destinationRoot, onProgress) {
+  if (!destinationRoot) {
+    return { folderIndex: new Map(), cadKeyIndex: new Set() };
+  }
+
+  const cached = await tryLoadFolderIndexCache(destinationRoot);
+
+  if (cached && (await isCacheStillValid(destinationRoot, cached))) {
+    // folderIndex dalla cache (istantaneo), cadKeyIndex sempre fresco
+    onProgress?.({ phase: 'index-cache', savedAt: cached.savedAt, total: cached.folderIndex.size });
+    const cadKeyIndex = await scanCadKeysFromFolderIndex(cached.folderIndex, onProgress);
+    return { folderIndex: cached.folderIndex, cadKeyIndex };
+  }
+
+  // Prima volta, cache invalidata o struttura cambiata: scansione completa
+  const result = await fullScan(destinationRoot, onProgress);
+  await saveFolderIndexCache(destinationRoot, result.folderIndex);
+  return result;
+}
+
+module.exports = { buildDestinationIndexes, setCacheDir, clearCache, toCadKey };

services/duplicateIndex.js

@@ -8,13 +8,15 @@ function toCadKey(cadInfo) {
   return String(cadInfo?.key || '').toLowerCase();
 }
 
-async function buildExistingCadKeyIndex(destinationRoot) {
+async function buildExistingCadKeyIndex(destinationRoot, onProgress) {
   const keys = new Set();
 
   if (!destinationRoot || !(await fs.pathExists(destinationRoot))) {
     return keys;
   }
 
+  let scanned = 0;
+
   async function walk(currentDir, depth) {
     if (depth > MAX_SCAN_DEPTH) {
       return;
@@ -44,6 +46,8 @@ async function buildExistingCadKeyIndex(destinationRoot) {
         continue;
       }
 
+      scanned += 1;
+      onProgress?.({ phase: 'index-dup', scanned, file: entry.name });
       keys.add(toCadKey(cadInfo));
     }
   }

services/folderProcessor.js

@@ -1,8 +1,7 @@
 const fs = require('fs-extra');
 const path = require('path');
 const { getDestinationDecision, getCadInfo } = require('./router');
-const { buildDestinationIndex } = require('./destinationIndex');
+const { buildDestinationIndexes, toCadKey } = require('./destinationScanner');
-const { buildExistingCadKeyIndex, toCadKey } = require('./duplicateIndex');
 const { prepareUnroutedTarget, prepareDuplicateTarget, getSkippedTarget } = require('./unrouted');
 
 function parseNumericVersion(version) {
@@ -66,10 +65,11 @@ async function collectFilesRecursively(rootDir) {
   return files;
 }
 
-async function processFolder(folder, config) {
+async function processFolder(folder, config, onProgress) {
+  onProgress?.({ phase: 'scan' });
   const files = await collectFilesRecursively(folder);
-  const destinationIndex = await buildDestinationIndex(config?.destination);
+
-  const existingCadKeys = await buildExistingCadKeyIndex(config?.destination);
+  const { folderIndex: destinationIndex, cadKeyIndex: existingCadKeys } = await buildDestinationIndexes(config?.destination, onProgress);
   const sourceMaxVersions = buildHighestNumericVersionByCadKey(files);
   const result = {
     scanned: 0,
@@ -80,9 +80,13 @@ async function processFolder(folder, config) {
     details: [],
   };
 
-  for (const { fullPath, fileName } of files) {
+  const total = files.length;
+
+  for (let i = 0; i < files.length; i++) {
+    const { fullPath, fileName } = files[i];
     const file = fileName;
     result.scanned += 1;
+    onProgress?.({ phase: 'copy', current: i + 1, total, file });
 
     const cadInfo = getCadInfo(file);
     if (!cadInfo) {

services/router.js

@@ -16,6 +16,9 @@ function getCadInfo(filename) {
   const version = match[3] || '';
   const digits = rawCode.replace(/\D/g, '');
   const routingGroup = digits.length >= 5 ? digits.slice(2, 5) : null;
+  const subfolder = digits.length >= 2
+    ? (digits[1] === '1' ? 'A' : digits[1] === '2' ? 'M_B' : null)
+    : null;
 
   return {
     code: rawCode,
@@ -24,6 +27,7 @@ function getCadInfo(filename) {
     version,
     key: `${rawCode}.${type}`,
     routingGroup,
+    subfolder,
   };
 }
 
@@ -57,7 +61,14 @@ function getDestinationDecision(filename, config, destinationIndex) {
     };
   }
 
-  return { destination: candidates[0], reason: null };
+  if (!cadInfo.subfolder) {
+    return {
+      destination: null,
+      reason: `Prefisso non riconosciuto (${cadInfo.digits[1]}): atteso 91 (→ A) o 92 (→ M_B)`,
+    };
+  }
+
+  return { destination: path.join(candidates[0], cadInfo.subfolder), reason: null };
 }
 
 function findDestination(filename, config, destinationIndex) {

services/zipProcessor.js

@@ -3,8 +3,7 @@ const fs = require('fs-extra');
 const path = require('path');
 const { pipeline } = require('stream/promises');
 const { getDestinationDecision, getCadInfo } = require('./router');
-const { buildDestinationIndex } = require('./destinationIndex');
+const { buildDestinationIndexes, toCadKey } = require('./destinationScanner');
-const { buildExistingCadKeyIndex, toCadKey } = require('./duplicateIndex');
 const { prepareUnroutedTarget, prepareDuplicateTarget, getSkippedTarget } = require('./unrouted');
 
 function parseNumericVersion(version) {
@@ -27,7 +26,7 @@ async function buildZipHighestNumericVersionByCadKey(zipPath) {
   try {
     directory = await unzipper.Open.file(zipPath);
   } catch {
-    return index;
+    return { index, total: 0 };
   }
 
   for (const row of directory.files || []) {
@@ -53,14 +52,16 @@ async function buildZipHighestNumericVersionByCadKey(zipPath) {
     }
   }
 
-  return index;
+  return { index, total: (directory.files || []).filter((f) => f.type === 'File').length };
 }
 
-async function processZip(zipPath, config) {
+async function processZip(zipPath, config, onProgress) {
+  onProgress?.({ phase: 'scan' });
+  const { index: sourceMaxVersions, total } = await buildZipHighestNumericVersionByCadKey(zipPath);
+
+  const { folderIndex: destinationIndex, cadKeyIndex: existingCadKeys } = await buildDestinationIndexes(config?.destination, onProgress);
+
   const stream = fs.createReadStream(zipPath).pipe(unzipper.Parse({ forceStream: true }));
-  const destinationIndex = await buildDestinationIndex(config?.destination);
-  const existingCadKeys = await buildExistingCadKeyIndex(config?.destination);
-  const sourceMaxVersions = await buildZipHighestNumericVersionByCadKey(zipPath);
   const result = {
     scanned: 0,
     copied: 0,
@@ -70,6 +71,8 @@ async function processZip(zipPath, config) {
     details: [],
   };
 
+  let current = 0;
+
   for await (const entry of stream) {
     if (entry.type !== 'File') {
       entry.autodrain();
@@ -78,7 +81,9 @@ async function processZip(zipPath, config) {
 
     const file = entry.path;
     const baseName = path.basename(file);
+    current += 1;
     result.scanned += 1;
+    onProgress?.({ phase: 'copy', current, total, file: baseName });
 
     const cadInfo = getCadInfo(baseName);
     if (!cadInfo) {