perf(scanner): ottimizza scansione destinazione con pass unico e barra determinata

Sostituisce le due scansioni sequenziali (cartelle + file CAD) con un
unico passaggio parallelo in services/destinationScanner.js. La lettura
di primo livello fornisce il totale delle sezioni, rendendo la barra
di progresso determinata (N / totale) durante l'analisi della destinazione.
Il label mostra contemporaneamente sezioni completate e file CAD trovati

renderer/renderer.js

@@ -32,16 +32,22 @@ function hideProgress() {
   progressContainer.style.display = 'none';
 }
 
+let _indexFilesFound = 0;
+
 function updateProgress({ phase, current, total, file, scanned, folder }) {
   if (phase === 'scan') {
+    _indexFilesFound = 0;
     progressLabel.textContent = 'Scansione file sorgente...';
     progressBar.removeAttribute('value');
   } else if (phase === 'index-dest') {
-    progressLabel.textContent = `Analisi destinazione: ${scanned} cartelle scansionate${folder ? `  —  ${folder}` : ''}`;
-    progressBar.removeAttribute('value');
+    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') {
-    progressLabel.textContent = `Ricerca duplicati: ${scanned} file CAD trovati${file ? `  —  ${file}` : ''}`;
-    progressBar.removeAttribute('value');
+    _indexFilesFound = scanned;
+    const dirInfo = progressBar.max > 0 ? `${progressBar.value} / ${progressBar.max}  —  ` : '';
+    progressLabel.textContent = `Analisi destinazione: ${dirInfo}${scanned} file CAD trovati`;
   } else if (phase === 'copy') {
     progressBar.max = total;
     progressBar.value = current;

services/destinationScanner.js

@@ -0,0 +1,114 @@
+const fs = require('fs-extra');
+const path = require('path');
+const { getCadInfo } = require('./router');
+
+const CODE_FOLDER_REGEX = /^\d{3}$/;
+const MAX_SCAN_DEPTH = 6;
+
+function toCadKey(cadInfo) {
+  return String(cadInfo?.key || '').toLowerCase();
+}
+
+/**
+ * Scansiona la cartella di destinazione in un unico passaggio parallelo e
+ * costruisce contemporaneamente:
+ *   - folderIndex: Map<group3digits, fullPath[]>  (per il routing)
+ *   - cadKeyIndex: Set<cadKey>                    (per il rilevamento duplicati)
+ *
+ * Legge prima le sottocartelle di primo livello (1 sola readdir) per ottenere
+ * il totale e mostrare una barra determinata durante la scansione.
+ */
+async function buildDestinationIndexes(destinationRoot, onProgress) {
+  const folderIndex = new Map();
+  const cadKeyIndex = new Set();
+
+  if (!destinationRoot || !(await fs.pathExists(destinationRoot))) {
+    return { folderIndex, cadKeyIndex };
+  }
+
+  // Lettura di primo livello: 1 sola chiamata per avere il totale
+  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;
+
+  // Registra i file CAD al primo livello (non cartelle)
+  for (const entry of topEntries) {
+    if (!entry.isFile()) continue;
+    const cadInfo = getCadInfo(entry.name);
+    if (cadInfo) {
+      scannedFiles += 1;
+      cadKeyIndex.add(toCadKey(cadInfo));
+    }
+  }
+
+  // Walk ricorsivo del sottoalbero di una cartella di primo livello
+  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);
+  }
+
+  // Processa tutte le cartelle di primo livello in parallelo
+  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 };
+}
+
+module.exports = { buildDestinationIndexes, toCadKey };

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 { buildExistingCadKeyIndex, toCadKey } = require('./duplicateIndex');
+const { buildDestinationIndexes, toCadKey } = require('./destinationScanner');
 const { prepareUnroutedTarget, prepareDuplicateTarget, getSkippedTarget } = require('./unrouted');
 
 function parseNumericVersion(version) {
@@ -70,8 +69,7 @@ async function processFolder(folder, config, onProgress) {
   onProgress?.({ phase: 'scan' });
   const files = await collectFilesRecursively(folder);
 
-  const destinationIndex = await buildDestinationIndex(config?.destination, onProgress);
-  const existingCadKeys = await buildExistingCadKeyIndex(config?.destination, onProgress);
+  const { folderIndex: destinationIndex, cadKeyIndex: existingCadKeys } = await buildDestinationIndexes(config?.destination, onProgress);
   const sourceMaxVersions = buildHighestNumericVersionByCadKey(files);
   const result = {
     scanned: 0,

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 { buildExistingCadKeyIndex, toCadKey } = require('./duplicateIndex');
+const { buildDestinationIndexes, toCadKey } = require('./destinationScanner');
 const { prepareUnroutedTarget, prepareDuplicateTarget, getSkippedTarget } = require('./unrouted');
 
 function parseNumericVersion(version) {
@@ -60,8 +59,7 @@ async function processZip(zipPath, config, onProgress) {
   onProgress?.({ phase: 'scan' });
   const { index: sourceMaxVersions, total } = await buildZipHighestNumericVersionByCadKey(zipPath);
 
-  const destinationIndex = await buildDestinationIndex(config?.destination, onProgress);
-  const existingCadKeys = await buildExistingCadKeyIndex(config?.destination, onProgress);
+  const { folderIndex: destinationIndex, cadKeyIndex: existingCadKeys } = await buildDestinationIndexes(config?.destination, onProgress);
 
   const stream = fs.createReadStream(zipPath).pipe(unzipper.Parse({ forceStream: true }));
   const result = {