# Plan: Phase J (WebSocket) + Turntable Bug + Phase K (Asset Library)

## Kontext

Analyse des aktuellen Codestands ergab: **Phasen F, G, H, I, L sind bereits vollständig implementiert.**

| Phase | Status | Beleg |
|-------|--------|-------|
| F - Hash-Caching | DONE | `domains/products/cache_service.py` + migration 041 |
| G - Billing | DONE | `domains/billing/` vollständig, WeasyPrint in Dockerfile |
| H - Excel Sanity-Check | DONE | `domains/imports/service.py run_sanity_check()` + Upload.tsx Dialog |
| I - Notification-Config | DONE | `notification_configs` migration 044, NotificationSettings.tsx |
| L - Dashboard | DONE | AdminDashboard.tsx + ClientDashboard.tsx vollständig |
| **J - WebSocket** | **FEHLT** | Kein `core/websocket.py`, alle Polls noch aktiv |

Zusätzlich: **Kritischer Bug in `render_blender.py`** — ffmpeg-Overlay-Befehl haengt bei endlicher Frame-Sequenz (kein `shortest=1`) -> Timeout -> Turntable-Render schlaegt fehl.

---

## Bug Fix: Turntable ffmpeg Timeout

**Root cause**: In `backend/app/services/render_blender.py:507`:
```python
"-filter_complex", "[1:v][0:v]overlay=0:0",
```
Der `lavfi color`-Quell-Stream hat keine definierte Laenge. Ohne `shortest=1` wartet ffmpeg auf
weitere Frames vom Farb-Stream nachdem die PNG-Sequenz endet -> haengt bis Timeout (300s).

**Fix**: `overlay=0:0` -> `overlay=0:0:shortest=1`

---

## Phase J: WebSocket Backend + Frontend

### Architektur (ADR-05: FastAPI nativ + Redis Pub/Sub)

```
Backend Task/Router:
  -> redis.publish(f"tenant:{tenant_id}", json.dumps(event))

core/websocket.py:
  ConnectionManager: tenant_id -> set[WebSocket]
  background_task: asyncio.Task (redis subscribe loop)

Frontend:
  useWebSocket() hook -> WebSocket('/api/ws')
  Empfaengt Events, invalidiert React Query caches
```

### Events die gesendet werden:
| Event | Sender | Daten |
|-------|--------|-------|
| `render_complete` | step_tasks.py | order_line_id, status, thumbnail_url |
| `render_failed` | step_tasks.py | order_line_id, error |
| `cad_processing_complete` | step_tasks.py | cad_file_id, status |
| `order_status_change` | orders router | order_id, new_status |
| `queue_update` | beat task (alle 10s) | depth per queue |

---

## Betroffene Dateien

### Neu erstellen:
- `backend/app/core/websocket.py` -- ConnectionManager + Redis Pub/Sub Loop
- `frontend/src/hooks/useWebSocket.ts` -- WebSocket hook mit Auto-Reconnect
- `frontend/src/contexts/WebSocketContext.tsx` -- Context Provider

### Aendern:
- `backend/app/services/render_blender.py` -- ffmpeg shortest=1 Bug-Fix
- `backend/app/main.py` -- WebSocket-Endpoint registrieren (`/api/ws`)
- `backend/app/tasks/step_tasks.py` -- WebSocket-Events emittieren
- `backend/app/domains/orders/router.py` -- Order-Status-Events emittieren
- `backend/app/tasks/celery_app.py` -- `broadcast_queue_status` Beat-Task hinzufuegen
- `frontend/src/App.tsx` -- WebSocketProvider wrappen
- `frontend/src/pages/WorkerActivity.tsx` -- polling durch WS ersetzen
- `frontend/src/pages/OrderDetail.tsx` -- polling durch WS ersetzen
- `frontend/src/pages/Orders.tsx` -- polling reduzieren
- `frontend/src/components/layout/Layout.tsx` -- polling reduzieren
- `frontend/src/components/layout/NotificationCenter.tsx` -- polling durch WS ersetzen

### Nach Phase J Commit -- Phase K:
- `backend/alembic/versions/045_asset_libraries.py` -- asset_libraries Tabelle
- `backend/app/domains/materials/models.py` -- AssetLibrary Model hinzufuegen
- `backend/app/domains/materials/router.py` -- Asset Library CRUD + Upload
- `render-worker/scripts/asset_library.py` -- Materialien + Node-Groups aus .blend laden
- `render-worker/scripts/catalog_assets.py` -- Katalog aus .blend lesen
- `render-worker/scripts/export_gltf.py` -- GLB Export mit Materialien
- `render-worker/scripts/export_blend.py` -- .blend Export mit pack_all()
- `backend/app/domains/rendering/workflow_builder.py` -- Asset Library Nodes
- `frontend/src/pages/Admin.tsx` -- Asset Library Manager UI
- `frontend/src/api/assetLibraries.ts` -- API Client

---

## Tasks (in Reihenfolge)

### Task 1: Bug-Fix ffmpeg Turntable Timeout [x]
- **Datei**: `backend/app/services/render_blender.py:507`
- **Was**: `"[1:v][0:v]overlay=0:0"` -> `"[1:v][0:v]overlay=0:0:shortest=1"`
- **Akzeptanzkriterium**: Turntable-Render fuer Order f0436188 kann erneut gestartet werden und produziert MP4
- **Abhaengigkeiten**: keine

### Task 2: WebSocket Backend -- core/websocket.py [x]
- **Datei**: `backend/app/core/websocket.py` (neu)
- **Was**:
  ```python
  class ConnectionManager:
      _connections: dict[str, set[WebSocket]]  # tenant_id -> sockets
      async def connect(ws, tenant_id)
      def disconnect(ws, tenant_id)
      async def broadcast_to_tenant(tenant_id, event: dict)
      async def start_redis_subscriber()  # asyncio background task

  def publish_event_sync(tenant_id: str, event: dict):
      # Sync version fuer Celery tasks -- redis.publish()
  ```
  - Redis Pub/Sub: subscribe auf `tenant:*` Channels
  - Bei Nachricht: alle WebSockets des Tenants benachrichtigen
  - Auto-Ping alle 30s gegen Disconnects
- **Akzeptanzkriterium**: broadcast_to_tenant sendet an alle verbundenen WS des Tenants
- **Abhaengigkeiten**: keine

### Task 3: WebSocket Endpoint in main.py [x]
- **Datei**: `backend/app/main.py`
- **Was**:
  ```python
  @app.websocket("/api/ws")
  async def ws_endpoint(websocket: WebSocket, token: str = Query(...)):
      user = await verify_ws_token(token)
      await manager.connect(websocket, str(user.tenant_id))
      try:
          while True:
              await websocket.receive_text()  # Keep-alive pings
      except WebSocketDisconnect:
          manager.disconnect(websocket, str(user.tenant_id))
  ```
  - Token-Auth via Query-Parameter (WS kann keinen Authorization-Header senden)
  - `verify_ws_token`: JWT decode, User laden (analog zu get_current_user)
  - `manager` als globale Instanz, gestartet im lifespan
- **Akzeptanzkriterium**: `ws://localhost:8888/api/ws?token=<jwt>` oeffnet Verbindung
- **Abhaengigkeiten**: Task 2

### Task 4: WebSocket Events in step_tasks.py [x]
- **Datei**: `backend/app/tasks/step_tasks.py`
- **Was**: In render_order_line_task und render_step_thumbnail nach Erfolg/Fehler:
  ```python
  from app.core.websocket import publish_event_sync
  # bei render complete:
  publish_event_sync(tenant_id, {"type": "render_complete", "order_line_id": str(line.id), "status": "completed"})
  # bei render failed:
  publish_event_sync(tenant_id, {"type": "render_failed", "order_line_id": str(line.id), "error": str(exc)})
  # bei CAD processing complete:
  publish_event_sync(tenant_id, {"type": "cad_processing_complete", "cad_file_id": str(cad_file.id), "status": "completed"})
  ```
  - tenant_id aus cad_file.tenant_id bzw. order_line -> order -> user.tenant_id laden
- **Akzeptanzkriterium**: Render fertig -> WebSocket-Client empfaengt Event
- **Abhaengigkeiten**: Task 2

### Task 5: WebSocket Events in orders router [x]
- **Datei**: `backend/app/domains/orders/router.py`
- **Was**: Bei Order-Status-Aenderung (submit, complete, cancel):
  ```python
  from app.core.websocket import manager
  await manager.broadcast_to_tenant(
      str(current_user.tenant_id),
      {"type": "order_status_change", "order_id": str(order.id), "status": new_status}
  )
  ```
- **Akzeptanzkriterium**: Order-Submit -> WebSocket-Event geht an alle Browser-Tabs des Tenants
- **Abhaengigkeiten**: Task 2

### Task 6: Queue-Update Beat-Task [x]
- **Datei**: `backend/app/tasks/celery_app.py`
- **Was**: Neuer Beat-Task alle 10s:
  ```python
  @shared_task(name="beat.broadcast_queue_status", queue="step_processing")
  def broadcast_queue_status():
      from app.core.websocket import publish_event_sync
      from redis import Redis
      r = Redis.from_url(settings.redis_url)
      depths = {
          "step_processing": r.llen("step_processing"),
          "thumbnail_rendering": r.llen("thumbnail_rendering"),
      }
      # Broadcast an alle Tenants (broadcast_all)
      r.publish("__broadcast__", json.dumps({"type": "queue_update", "depths": depths}))
  ```
  - `__broadcast__` Channel: wird an ALLE verbundenen WS gesendet (nicht tenant-spezifisch)
  - ConnectionManager subscribt auch auf `__broadcast__`
- **Akzeptanzkriterium**: WorkerActivity-Queue-Tiefe aktualisiert alle 10s automatisch
- **Abhaengigkeiten**: Task 2

### Task 7: Frontend WebSocket Hook [x]
- **Datei**: `frontend/src/hooks/useWebSocket.ts` (neu)
- **Was**:
  ```typescript
  export function useWebSocketConnection() {
    // Verbindet zu ws://localhost:8888/api/ws?token=<jwt>
    // Auto-Reconnect: 1s, 2s, 4s, 8s, ... max 30s
    // Emittiert Events via onMessage callback
    // Pings alle 25s (keep-alive)
    // Trennt Verbindung bei Logout
  }
  ```
- **Akzeptanzkriterium**: Verbindung bleibt offen, reconnected nach Netzwerktrennung
- **Abhaengigkeiten**: keine

### Task 8: Frontend WebSocket Context [x]
- **Datei**: `frontend/src/contexts/WebSocketContext.tsx` (neu), `frontend/src/App.tsx` aendern
- **Was**:
  ```typescript
  export function WebSocketProvider({ children }) {
    const queryClient = useQueryClient()
    // on 'render_complete': invalidateQueries(['orders', order_line_id])
    // on 'render_failed': invalidateQueries(['orders', order_line_id])
    // on 'cad_processing_complete': invalidateQueries(['cad-activity'])
    // on 'order_status_change': invalidateQueries(['orders'])
    // on 'queue_update': queryClient.setQueryData(['queue-status'], ...)
  }
  // App.tsx: <WebSocketProvider> um <Router> wrappen
  ```
- **Akzeptanzkriterium**: render_complete Event -> OrderDetail aktualisiert ohne Poll-Interval
- **Abhaengigkeiten**: Task 7

### Task 9: Polling ersetzen -- WorkerActivity.tsx [x]
- **Datei**: `frontend/src/pages/WorkerActivity.tsx`
- **Was**:
  - `refetchInterval: 5000` entfernen -- bei `cad_processing_complete` invalidieren
  - `refetchInterval: 3000` fuer Queue-Status entfernen -- bei `queue_update` setQueryData
- **Akzeptanzkriterium**: Keine automatischen HTTP-Requests im Network-Tab (nur WS-Frames)
- **Abhaengigkeiten**: Task 8

### Task 10: Polling ersetzen -- OrderDetail.tsx [x]
- **Datei**: `frontend/src/pages/OrderDetail.tsx`
- **Was**:
  - `refetchInterval: (query) => {...}` entfernen
  - Stattdessen: bei `render_complete` / `render_failed` fuer matching order_line_id -> invalidate
- **Akzeptanzkriterium**: Render-Status in OrderDetail aktualisiert live ohne Poll
- **Abhaengigkeiten**: Task 8

### Task 11: Polling reduzieren -- Layout.tsx + NotificationCenter.tsx [x]
- **Dateien**: `frontend/src/components/layout/Layout.tsx`, `NotificationCenter.tsx`
- **Was**:
  - Layout: `refetchInterval: 8000` -> 60000 (1min)
  - NotificationCenter: `refetchInterval: 15_000` -> 60000; bei `order_status_change` zusaetzlich invalidieren
- **Akzeptanzkriterium**: Signifikant weniger Poll-Requests im Network-Tab
- **Abhaengigkeiten**: Task 8

### Task 12: PLAN.md + LEARNINGS.md + Commit [x]
- **Was**:
  - PLAN.md: Phase J als ABGESCHLOSSEN markieren, Status auf "Phase K als naechstes"
  - LEARNINGS.md: ffmpeg `shortest=1` Learning + WebSocket Auth via Query-Param Learning
  - `git commit -m "feat(J): WebSocket live-events + replace polling + fix ffmpeg turntable timeout"`
- **Abhaengigkeiten**: Tasks 1-11

---

## Phase K Tasks (nach Commit)

### Task K1: Migration 045 + AssetLibrary Model [ ]
- **Datei**: `backend/alembic/versions/045_asset_libraries.py` (neu, autogenerate), `domains/materials/models.py`
- **Was**:
  ```python
  class AssetLibrary(Base):
      id: UUID PK, tenant_id FK nullable, name VARCHAR(200)
      blend_file_key TEXT,  # MinIO key
      catalog JSONB,  # {materials: [...], node_groups: [...]}
      description TEXT, is_active BOOL, created_at TIMESTAMP
  ```
  - `render_templates.asset_library_id` FK optional (nullable)
  - `output_types.asset_library_id` FK optional (nullable)
- **Akzeptanzkriterium**: `alembic upgrade head` erfolgreich, `asset_libraries` Tabelle in DB

### Task K2: Asset Library CRUD Backend [ ]
- **Datei**: `backend/app/domains/materials/router.py` + `service.py` + `schemas.py`
- **Was**:
  - `POST /api/asset-libraries` -- .blend Upload -> MinIO `asset-libraries/{id}.blend` -> queut Katalog-Refresh
  - `GET /api/asset-libraries` -- Liste
  - `GET /api/asset-libraries/{id}/catalog` -- Materialien + Node-Groups
  - `DELETE /api/asset-libraries/{id}` -- nur wenn nicht in Verwendung (FK-Check)
  - `AssetLibraryOut` Schema mit `catalog` field
- **Akzeptanzkriterium**: POST + GET funktionieren, .blend in MinIO gespeichert

### Task K3: Katalog-Refresh Celery Task + Blender Script [ ]
- **Datei**: `backend/app/domains/materials/tasks.py` (neu), `render-worker/scripts/catalog_assets.py` (neu)
- **Was**:
  - Celery Task `refresh_asset_library_catalog(asset_library_id)` auf Queue `thumbnail_rendering`
  - Laedt .blend aus MinIO in tmpdir
  - Startet `blender --background --python catalog_assets.py -- <blend_path>`
  - `catalog_assets.py`: oeffnet .blend, liest alle markierten Assets:
    ```python
    import bpy, json, sys
    blend_path = sys.argv[sys.argv.index('--') + 1]
    bpy.ops.wm.open_mainfile(filepath=blend_path)
    catalog = {
        "materials": [m.name for m in bpy.data.materials if m.asset_data],
        "node_groups": [ng.name for ng in bpy.data.node_groups if ng.asset_data],
    }
    print(json.dumps(catalog))
    ```
  - Schreibt Katalog in `asset_libraries.catalog JSONB`
- **Akzeptanzkriterium**: Nach .blend-Upload enthaelt `catalog` JSONB die Asset-Namen

### Task K4: Blender Asset Library Apply Script [ ]
- **Datei**: `render-worker/scripts/asset_library.py` (neu)
- **Was**:
  ```python
  def apply_asset_library_materials(blend_path: str, material_map: dict) -> None:
      """Laedt Materialien aus Asset-Library .blend, wendet auf Mesh-Parts an."""
      with bpy.data.libraries.load(blend_path, link=True, assets_only=True) as (src, dst):
          dst.materials = [n for n in src.materials if n in material_map.values()]
      for obj in bpy.data.objects:
          if obj.type == 'MESH':
              for slot in obj.material_slots:
                  resolved = material_map.get(slot.material.name if slot.material else '')
                  if resolved and resolved in bpy.data.materials:
                      slot.material = bpy.data.materials[resolved]

  def apply_asset_library_modifiers(blend_path: str, modifier_map: dict) -> None:
      """Laedt Geometry-Node-Gruppen, wendet als Modifier an."""
      with bpy.data.libraries.load(blend_path, link=True, assets_only=True) as (src, dst):
          dst.node_groups = [n for n in src.node_groups if n in modifier_map.values()]
      for obj in bpy.data.objects:
          if obj.type == 'MESH':
              for part_name, mod_name in modifier_map.items():
                  if part_name.lower() in obj.name.lower():
                      mod = obj.modifiers.new(name=mod_name, type='NODES')
                      mod.node_group = bpy.data.node_groups.get(mod_name)
  ```
- **Akzeptanzkriterium**: Render mit Asset-Library zeigt korrekte Produktionsmaterialien

### Task K5: export_gltf + export_blend Scripts [ ]
- **Dateien**: `render-worker/scripts/export_gltf.py` (neu), `render-worker/scripts/export_blend.py` (neu)
- **Was**:
  - `export_gltf.py`:
    1. STL importieren (`bpy.ops.import_mesh.stl`)
    2. Asset Library laden via `apply_asset_library_materials` + `apply_asset_library_modifiers`
    3. `bpy.ops.export_scene.gltf(filepath=out, export_format='GLB', export_apply=True, export_draco_mesh_compression_enable=True)`
    4. Output nach MinIO `production-exports/{cad_file_id}/{run_id}.glb`
    5. MediaAsset-Record mit `asset_type=gltf_production`
  - `export_blend.py`:
    1. STL + Asset Library laden (wie export_gltf)
    2. `bpy.ops.file.pack_all()`
    3. `bpy.ops.wm.save_as_mainfile(filepath=out, compress=True, copy=True)`
    4. MediaAsset-Record mit `asset_type=blend_production`
- **Akzeptanzkriterium**: GLB-Download oeffnet sich im Three.js Viewer mit Materialien

### Task K6: Workflow-Builder -- Asset Library Nodes [ ]
- **Datei**: `backend/app/domains/rendering/workflow_builder.py`
- **Was**:
  - Neue Celery Tasks: `apply_asset_library_materials_task`, `apply_asset_library_modifiers_task`, `export_gltf_task`, `export_blend_task`
  - Neuer Workflow-Typ `still_production`:
    ```python
    chain(
        convert_step.si(order_line_id),
        group(
            chain(apply_asset_library_materials.si(order_line_id), render_still.si(order_line_id)),
            chain(apply_asset_library_materials.si(order_line_id), export_gltf.si(order_line_id)),
            chain(apply_asset_library_materials.si(order_line_id), export_blend.si(order_line_id)),
        ),
        generate_thumbnail.si(order_line_id),
        publish_asset.si(order_line_id),
    )
    ```
- **Akzeptanzkriterium**: Dispatch eines `still_production` Workflows -> PNG + GLB + .blend erzeugt

### Task K7: Asset Library Management UI [ ]
- **Dateien**: `frontend/src/api/assetLibraries.ts` (neu), `frontend/src/pages/Admin.tsx` erweitern
- **Was**:
  - API Client: `getAssetLibraries`, `uploadAssetLibrary` (multipart), `deleteAssetLibrary`, `getAssetLibraryCatalog`
  - Admin.tsx: neues Panel "Asset Libraries" (nach Render Templates)
    - Upload-Button + Drag-Drop
    - Tabelle: Name, Materialien-Anzahl, Node-Groups-Anzahl, Aktionen
    - Katalog-Detail: Material-Badge-Liste (gruen) + Node-Group-Badge-Liste (blau)
  - OutputTypeTable: Asset-Library-Dropdown-Spalte
- **Akzeptanzkriterium**: Admin kann .blend hochladen, Katalog sehen, OutputType zuweisen

### Task K8: PLAN.md + LEARNINGS.md + Commit [ ]
- **Was**:
  - PLAN.md: Phase K als ABGESCHLOSSEN markieren
  - LEARNINGS.md: Asset Library link=True Pattern, GLB-Export Blender API
  - `git commit -m "feat(K): Blender Asset Library + production exports (GLB + .blend)"`

---

## Migrations-Check

| Migration | Phase | Status |
|-----------|-------|--------|
| 041 step_file_hash | F | existiert |
| 042 invoices | G | existiert |
| 043 import_validations | H | existiert |
| 044 notification_configs | I | existiert |
| **045 asset_libraries** | **K** | **fehlt** |

---

## Reihenfolge-Empfehlung

```
Task 1 (Bug-Fix, sofort)
  Tasks 2-6 parallel (Backend WebSocket)
  Tasks 7-8 parallel (Frontend Hook + Context)
  Tasks 9-11 (Polling ersetzen, nach 8)
  Task 12 (Commit)
  Tasks K1-K3 parallel (Datenmodell + Backend + Blender-Katalog)
  Tasks K4-K5 parallel (Blender Scripts)
  Tasks K6-K7 (Workflow + UI, nach K1-K5)
  Task K8 (Commit)
```

---

## Risiken / Offene Fragen

- **WebSocket Auth via Query-Param**: Token in Server-Logs sichtbar. Fuer v2 akzeptabel. In v3: kurzlebigen WS-Token (TTL 30s) aus JWT generieren.
- **Redis Pub/Sub Skalierung**: Bei vielen Tenants/Tabs kann Subscriber-Loop Bottleneck werden. Fuer v2 OK. In v3: Redis Streams.
- **Phase K -- MinIO Bucket**: `asset-libraries` Bucket muss beim Startup erstellt werden (lifespan in main.py).
- **Phase K -- link=True** bedeutet .blend muss vor Render via MinIO heruntergeladen werden (in tmpdir). Bereits einkalkuliert in K3.
- **Bestehende material_libraries**: Die alte `material_libraries` Tabelle/Feature bleibt parallel bestehen -- kein Breaking Change. Asset Libraries sind additiv.