feat(router): rilevamento duplicati pre-smistamento e instradamento in duplicati

services/duplicateIndex.js

@@ -0,0 +1,55 @@
+const fs = require('fs-extra');
+const path = require('path');
+const { getCadInfo } = require('./router');
+
+const MAX_SCAN_DEPTH = 8;
+
+function toCadKey(cadInfo) {
+  return String(cadInfo?.key || '').toLowerCase();
+}
+
+async function buildExistingCadKeyIndex(destinationRoot) {
+  const keys = new Set();
+
+  if (!destinationRoot || !(await fs.pathExists(destinationRoot))) {
+    return keys;
+  }
+
+  async function walk(currentDir, depth) {
+    if (depth > MAX_SCAN_DEPTH) {
+      return;
+    }
+
+    let entries;
+    try {
+      entries = await fs.readdir(currentDir, { withFileTypes: true });
+    } catch {
+      return;
+    }
+
+    for (const entry of entries) {
+      const fullPath = path.join(currentDir, entry.name);
+
+      if (entry.isDirectory()) {
+        await walk(fullPath, depth + 1);
+        continue;
+      }
+
+      if (!entry.isFile()) {
+        continue;
+      }
+
+      const cadInfo = getCadInfo(entry.name);
+      if (!cadInfo) {
+        continue;
+      }
+
+      keys.add(toCadKey(cadInfo));
+    }
+  }
+
+  await walk(destinationRoot, 0);
+  return keys;
+}
+
+module.exports = { buildExistingCadKeyIndex, toCadKey };