feat(workspace): synchronize folders with server and add folder deletion

frontend/src/features/workspace/WorkspaceView.tsx

@@ -101,15 +101,13 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
   const [showIconPicker, setShowIconPicker] = useState(false);
   const [showWikiLinkMenu, setShowWikiLinkMenu] = useState(false);
 
-  // Folder state
-  const [customFolders, setCustomFolders] = useState<string[]>(() => {
+  // Folder state (synchronized with server)
+  const [customFolders, setCustomFolders] = useState<string[]>([]);
+  useEffect(() => {
     try {
-      const stored = localStorage.getItem('mindsift_workspace_folders');
-      return stored ? JSON.parse(stored) : [];
-    } catch {
-      return [];
-    }
-  });
+      localStorage.removeItem('mindsift_workspace_folders');
+    } catch {}
+  }, []);
   const [expandedFolders, setExpandedFolders] = useState<Set<string>>(new Set());
   const [isCreatingFolder, setIsCreatingFolder] = useState(false);
   const [newFolderParent, setNewFolderParent] = useState<string | null>(null);
@@ -344,20 +342,28 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
   };
 
   const loadDocs = async (selectId?: string | null) => {
-    const list = await api.getDocuments();
-    setDocs(list);
-    if (selectId) {
-      const found = list.find((d) => d.id === selectId);
-      if (found) {
-        setSelectedDoc(found);
-        return;
+    try {
+      const [list, serverFolders] = await Promise.all([
+        api.getDocuments(),
+        api.getFolders(),
+      ]);
+      setDocs(list);
+      setCustomFolders(serverFolders);
+      if (selectId) {
+        const found = list.find((d) => d.id === selectId);
+        if (found) {
+          setSelectedDoc(found);
+          return;
+        }
       }
-    }
-    if (!selectedDoc && list.length > 0) {
-      setSelectedDoc(list[0]);
-    } else if (selectedDoc) {
-      const updated = list.find((d) => d.id === selectedDoc.id);
-      if (updated) setSelectedDoc(updated);
+      if (!selectedDoc && list.length > 0) {
+        setSelectedDoc(list[0]);
+      } else if (selectedDoc) {
+        const updated = list.find((d) => d.id === selectedDoc.id);
+        if (updated) setSelectedDoc(updated);
+      }
+    } catch (err) {
+      console.error('Error loading documents or folders:', err);
     }
   };
 
@@ -504,6 +510,8 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
           }
           onStatsChange();
         }
+      } else if (msg.event === 'WORKSPACE_FOLDERS_UPDATED') {
+        api.getFolders().then(setCustomFolders).catch(() => {});
       }
     };
 
@@ -817,25 +825,13 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
         .catch((err) => console.error('Failed to update doc folder', err));
     }
 
-    // 2. Update customFolders in state & localStorage
-    const updatedCustomFolders = customFolders.map((p) => {
-      if (p === cleanSource) return newFolderPath;
-      if (p.startsWith(cleanSource + '/')) {
-        return `${newFolderPath}${p.slice(cleanSource.length)}`;
-      }
-      return p;
-    });
-
-    if (!updatedCustomFolders.includes(newFolderPath)) {
-      updatedCustomFolders.push(newFolderPath);
-    }
-    const sortedCustom = Array.from(new Set(updatedCustomFolders)).sort((a, b) =>
-      a.localeCompare(b)
-    );
-    setCustomFolders(sortedCustom);
-    try {
-      localStorage.setItem('mindsift_workspace_folders', JSON.stringify(sortedCustom));
-    } catch {}
+    // 2. Sync folder structure with server
+    api
+      .createFolder(newFolderPath)
+      .then(() => api.deleteFolder(cleanSource))
+      .then(() => api.getFolders())
+      .then(setCustomFolders)
+      .catch((err) => console.error('Error syncing moved folders with server', err));
 
     // Expand the new folder path and its parent
     setExpandedFolders((prev) => {
@@ -881,20 +877,21 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
     }
   };
 
-  const handleConfirmCreateFolder = () => {
+  const handleConfirmCreateFolder = async () => {
     const trimmed = newFolderName.trim();
     if (!trimmed) {
       setIsCreatingFolder(false);
       return;
     }
     const fullPath = newFolderParent ? `${newFolderParent}/${trimmed}` : trimmed;
-    if (!customFolders.includes(fullPath)) {
-      const next = [...customFolders, fullPath].sort((a, b) => a.localeCompare(b));
-      setCustomFolders(next);
-      try {
-        localStorage.setItem('mindsift_workspace_folders', JSON.stringify(next));
-      } catch {
-        // ignore
+    try {
+      await api.createFolder(fullPath);
+      const serverFolders = await api.getFolders();
+      setCustomFolders(serverFolders);
+    } catch (err) {
+      console.error('Failed to create folder on server', err);
+      if (!customFolders.includes(fullPath)) {
+        setCustomFolders((prev) => [...prev, fullPath].sort((a, b) => a.localeCompare(b)));
       }
     }
     setExpandedFolders((prev) => new Set([...prev, fullPath]));
@@ -903,6 +900,40 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
     setNewFolderParent(null);
   };
 
+  const handleDeleteFolder = async (folderPath: string, folderName: string) => {
+    // Find all documents in this folder and subfolders
+    const docsInFolder = docs.filter((d) => {
+      const f = getDocFolder(d);
+      return f === folderPath || f.startsWith(`${folderPath}/`);
+    });
+
+    const confirmMsg =
+      docsInFolder.length > 0
+        ? `Möchtest du den Ordner "${folderName}" wirklich löschen? Alle ${docsInFolder.length} darin enthaltenen Notizen werden unwiderruflich gelöscht!`
+        : `Möchtest du den leeren Ordner "${folderName}" wirklich löschen?`;
+
+    if (!window.confirm(confirmMsg)) return;
+
+    try {
+      const res = await api.deleteFolder(folderPath);
+      const deletedIds = new Set(res.deletedDocIds || docsInFolder.map((d) => d.id));
+
+      const nextDocs = docs.filter((d) => !deletedIds.has(d.id));
+      setDocs(nextDocs);
+
+      if (selectedDoc && deletedIds.has(selectedDoc.id)) {
+        setSelectedDoc(nextDocs.length > 0 ? nextDocs[0] : null);
+      }
+
+      const serverFolders = await api.getFolders();
+      setCustomFolders(serverFolders);
+      onStatsChange();
+    } catch (err) {
+      console.error('Failed to delete folder', err);
+      alert('Fehler beim Löschen des Ordners');
+    }
+  };
+
   const toggleFolder = (folderPath: string) => {
     setExpandedFolders((prev) => {
       const next = new Set(prev);
@@ -1688,6 +1719,17 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
             >
               <FolderPlus className="w-3 h-3" />
             </button>
+            <button
+              type="button"
+              onClick={(e) => {
+                e.stopPropagation();
+                handleDeleteFolder(node.path, node.name);
+              }}
+              className="p-1 hover:bg-red-500/10 text-muted hover:text-red-400 rounded-btn transition-colors"
+              title="Ordner löschen"
+            >
+              <Trash2 className="w-3 h-3" />
+            </button>
           </div>
         </div>
 

frontend/src/lib/api.ts

@@ -368,6 +368,26 @@ export const api = {
     await request(`/api/v1/task-lists/${id}`, { method: 'DELETE' });
   },
 
+  // --- WORKSPACE FOLDERS ---
+  async getFolders(): Promise<string[]> {
+    const res = await request<string[]>('/api/v1/folders');
+    return ensureArray(res);
+  },
+
+  async createFolder(path: string): Promise<{ path: string }> {
+    return request<{ path: string }>('/api/v1/folders', {
+      method: 'POST',
+      body: JSON.stringify({ path }),
+    });
+  },
+
+  async deleteFolder(path: string): Promise<{ deleted: boolean; deletedDocIds: string[] }> {
+    return request<{ deleted: boolean; deletedDocIds: string[] }>(
+      `/api/v1/folders?path=${encodeURIComponent(path)}`,
+      { method: 'DELETE' }
+    );
+  },
+
   // --- WORKSPACE DOCUMENTS ---
   async getDocuments(): Promise<Document[]> {
     const res = await request<Document[]>('/api/v1/documents');

internal/api/server.go

@@ -95,7 +95,11 @@ func (s *Server) Router() http.Handler {
 		r.Put("/api/v1/task-lists/{id}", s.handleUpdateTaskList)
 		r.Delete("/api/v1/task-lists/{id}", s.handleDeleteTaskList)
 
-		// Workspace Documents
+		// Workspace Documents & Folders
+		r.Get("/api/v1/folders", s.handleGetFolders)
+		r.Post("/api/v1/folders", s.handleCreateFolder)
+		r.Delete("/api/v1/folders", s.handleDeleteFolder)
+
 		r.Get("/api/v1/documents", s.handleGetDocuments)
 		r.Post("/api/v1/documents", s.handleCreateDocument)
 		r.Get("/api/v1/documents/{id}", s.handleGetDocument)
@@ -811,6 +815,62 @@ func (s *Server) handleDeleteDocument(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]bool{"deleted": true})
 }
 
+// --- WORKSPACE FOLDERS ---
+
+func (s *Server) handleGetFolders(w http.ResponseWriter, r *http.Request) {
+	userID := auth.GetUserID(r.Context())
+	folders, err := s.store.GetFolders(userID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	writeJSON(w, http.StatusOK, folders)
+}
+
+func (s *Server) handleCreateFolder(w http.ResponseWriter, r *http.Request) {
+	userID := auth.GetUserID(r.Context())
+	var req struct {
+		Path string `json:"path"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "Ungültiges JSON")
+		return
+	}
+	cleanPath, err := s.store.CreateFolder(userID, req.Path)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	s.wsHub.BroadcastDocEvent("", "WORKSPACE_FOLDERS_UPDATED", map[string]string{"path": cleanPath})
+	writeJSON(w, http.StatusCreated, map[string]string{"path": cleanPath})
+}
+
+func (s *Server) handleDeleteFolder(w http.ResponseWriter, r *http.Request) {
+	userID := auth.GetUserID(r.Context())
+	folderPath := r.URL.Query().Get("path")
+	if folderPath == "" {
+		writeError(w, http.StatusBadRequest, "Pfad erforderlich")
+		return
+	}
+
+	deletedDocIDs, err := s.store.DeleteFolder(userID, folderPath)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	for _, docID := range deletedDocIDs {
+		s.wsHub.ReleaseDocLock(docID, userID, true)
+		s.wsHub.BroadcastDocEvent(docID, "DOC_DELETED", map[string]string{"id": docID})
+	}
+	s.wsHub.BroadcastDocEvent("", "WORKSPACE_FOLDERS_UPDATED", map[string]string{"path": folderPath})
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"deleted":       true,
+		"deletedDocIds": deletedDocIDs,
+	})
+}
+
 // --- DOCUMENT SHARING & COLLABORATION ---
 
 func (s *Server) handleGetDocShares(w http.ResponseWriter, r *http.Request) {

internal/storage/sqlite.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -1435,6 +1436,135 @@ func (s *Store) DeleteDocument(userID, docID string) error {
 	return err
 }
 
+func (s *Store) GetFolders(userID string) ([]string, error) {
+	folderSet := make(map[string]bool)
+
+	// 1. Collect from SQLite documents (owned by user or shared with user)
+	rows, err := s.db.Query(
+		`SELECT DISTINCT folder_path FROM documents 
+		 WHERE (user_id = ? OR id IN (SELECT doc_id FROM doc_shares WHERE user_id = ?)) 
+		   AND is_archived = 0 AND folder_path != ''`,
+		userID, userID,
+	)
+	if err == nil {
+		for rows.Next() {
+			var fp string
+			if err := rows.Scan(&fp); err == nil && fp != "" {
+				clean := filepath.ToSlash(filepath.Clean(fp))
+				parts := strings.Split(clean, "/")
+				var cur string
+				for _, p := range parts {
+					if p != "" && p != "." {
+						if cur == "" {
+							cur = p
+						} else {
+							cur = cur + "/" + p
+						}
+						folderSet[cur] = true
+					}
+				}
+			}
+		}
+		_ = rows.Close()
+	}
+
+	// 2. Scan physical directories on disk in docDir/userID
+	if s.docDir != "" {
+		userDir := filepath.Join(s.docDir, userID)
+		if fi, err := os.Stat(userDir); err == nil && fi.IsDir() {
+			_ = filepath.Walk(userDir, func(path string, info os.FileInfo, err error) error {
+				if err != nil || !info.IsDir() {
+					return nil
+				}
+				if path == userDir {
+					return nil
+				}
+				rel, err := filepath.Rel(userDir, path)
+				if err == nil && rel != "" && rel != "." {
+					clean := filepath.ToSlash(filepath.Clean(rel))
+					parts := strings.Split(clean, "/")
+					var cur string
+					for _, p := range parts {
+						if p != "" && p != "." {
+							if cur == "" {
+								cur = p
+							} else {
+								cur = cur + "/" + p
+							}
+							folderSet[cur] = true
+						}
+					}
+				}
+				return nil
+			})
+		}
+	}
+
+	result := make([]string, 0, len(folderSet))
+	for f := range folderSet {
+		result = append(result, f)
+	}
+	sort.Strings(result)
+	return result, nil
+}
+
+func (s *Store) CreateFolder(userID, folderPath string) (string, error) {
+	clean := filepath.ToSlash(filepath.Clean(strings.TrimSpace(folderPath)))
+	if clean == "" || clean == "." || strings.HasPrefix(clean, "/") || strings.Contains(clean, "..") {
+		return "", fmt.Errorf("ungültiger Ordnerpfad")
+	}
+
+	if s.docDir != "" {
+		targetDir := filepath.Join(s.docDir, userID, clean)
+		if err := os.MkdirAll(targetDir, 0755); err != nil {
+			return "", err
+		}
+	}
+	return clean, nil
+}
+
+func (s *Store) DeleteFolder(userID, folderPath string) ([]string, error) {
+	clean := filepath.ToSlash(filepath.Clean(strings.TrimSpace(folderPath)))
+	if clean == "" || clean == "." || strings.HasPrefix(clean, "/") || strings.Contains(clean, "..") {
+		return nil, fmt.Errorf("ungültiger Ordnerpfad")
+	}
+
+	// Find all documents in this folder and subfolders
+	rows, err := s.db.Query(
+		`SELECT id FROM documents 
+		 WHERE user_id = ? AND (folder_path = ? OR folder_path LIKE ?)`,
+		userID, clean, clean+"/%",
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var deletedDocIDs []string
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err == nil {
+			deletedDocIDs = append(deletedDocIDs, id)
+		}
+	}
+	_ = rows.Close()
+
+	// Delete from SQLite, pins, shares
+	for _, id := range deletedDocIDs {
+		_, _ = s.db.Exec(`DELETE FROM doc_pins WHERE doc_id = ?`, id)
+		_, _ = s.db.Exec(`DELETE FROM doc_shares WHERE doc_id = ?`, id)
+		_, _ = s.db.Exec(`DELETE FROM documents WHERE id = ? AND user_id = ?`, id, userID)
+	}
+
+	// Remove physical folder and subdirectories from disk
+	if s.docDir != "" {
+		targetDir := filepath.Join(s.docDir, userID, clean)
+		_ = os.RemoveAll(targetDir)
+	}
+
+	return deletedDocIDs, nil
+}
+
 func (s *Store) GetDocShares(docID string) ([]domain.DocShare, error) {
 	rows, err := s.db.Query(
 		`SELECT s.id, s.doc_id, s.user_id, u.email, u.display_name, s.permission, s.created_by, s.created_at

internal/storage/sqlite_test.go

@@ -1,6 +1,7 @@
 package storage
 
 import (
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -317,3 +318,83 @@ func TestEnsureDemoAccountsAndLoginLookup(t *testing.T) {
 		t.Fatalf("second EnsureDemoAccounts call failed: %v", err)
 	}
 }
+
+func TestFolderManagementAndDeletion(t *testing.T) {
+	tmpDir := t.TempDir()
+	dbPath := filepath.Join(tmpDir, "folder_test.db")
+	docDir := filepath.Join(tmpDir, "workspace")
+
+	store, err := NewStore(dbPath)
+	if err != nil {
+		t.Fatalf("NewStore failed: %v", err)
+	}
+	defer store.Close()
+
+	user, err := store.CreateUser("folderuser@example.com", "hash", "Folder User", "member")
+	if err != nil {
+		t.Fatalf("CreateUser failed: %v", err)
+	}
+
+	// 1. Create folders on disk
+	f1, err := store.CreateFolder(user.ID, "Projekte/MindSift")
+	if err != nil || f1 != "Projekte/MindSift" {
+		t.Fatalf("CreateFolder failed: %v, f1=%s", err, f1)
+	}
+	f2, err := store.CreateFolder(user.ID, "Archiv")
+	if err != nil || f2 != "Archiv" {
+		t.Fatalf("CreateFolder Archiv failed: %v", err)
+	}
+
+	// 2. Create document in subfolder
+	doc1, err := store.CreateDocument(user.ID, "", "Doc in MindSift", "📄", "Projekte/MindSift", nil, nil, false)
+	if err != nil {
+		t.Fatalf("CreateDocument failed: %v", err)
+	}
+	doc2, err := store.CreateDocument(user.ID, "", "SubDoc", "📝", "Projekte/MindSift/Sub", nil, nil, false)
+	if err != nil {
+		t.Fatalf("CreateDocument 2 failed: %v", err)
+	}
+
+	// 3. GetFolders
+	folders, err := store.GetFolders(user.ID)
+	if err != nil {
+		t.Fatalf("GetFolders failed: %v", err)
+	}
+	expected := map[string]bool{
+		"Archiv":                 true,
+		"Projekte":               true,
+		"Projekte/MindSift":      true,
+		"Projekte/MindSift/Sub":  true,
+	}
+	for _, f := range folders {
+		delete(expected, f)
+	}
+	if len(expected) > 0 {
+		t.Fatalf("GetFolders missing expected folders: %v (got %v)", expected, folders)
+	}
+
+	// 4. DeleteFolder "Projekte/MindSift" -> should remove doc1 & doc2
+	deletedDocs, err := store.DeleteFolder(user.ID, "Projekte/MindSift")
+	if err != nil {
+		t.Fatalf("DeleteFolder failed: %v", err)
+	}
+	if len(deletedDocs) != 2 {
+		t.Fatalf("expected 2 deleted docs, got %d (%v)", len(deletedDocs), deletedDocs)
+	}
+
+	// Verify docs are gone from DB
+	_, err = store.GetDocumentByID(user.ID, doc1.ID)
+	if err == nil {
+		t.Fatalf("expected doc1 to be deleted")
+	}
+	_, err = store.GetDocumentByID(user.ID, doc2.ID)
+	if err == nil {
+		t.Fatalf("expected doc2 to be deleted")
+	}
+
+	// Verify disk directory was deleted
+	diskFolder := filepath.Join(docDir, user.ID, "Projekte/MindSift")
+	if _, err := os.Stat(diskFolder); !os.IsNotExist(err) {
+		t.Fatalf("expected directory %s to be deleted on disk", diskFolder)
+	}
+}