From d54a67662bdbc1da7057940e1850ee748a520adb Mon Sep 17 00:00:00 2001
From: Agent Zero <agent@media-on.de>
Date: Wed, 26 Aug 2026 23:10:20 +0200
Subject: [PATCH] task(A4.1): wire dispatcher to canvas - doc bridge, selection
 bridge, activeTool sync

---
 frontend/src/components/CanvasArea.tsx | 41 ++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/frontend/src/components/CanvasArea.tsx b/frontend/src/components/CanvasArea.tsx
index df4c164..f4cdbff 100644
--- a/frontend/src/components/CanvasArea.tsx
+++ b/frontend/src/components/CanvasArea.tsx
@@ -14,6 +14,9 @@ import { GroupManager } from '../tools/modification/GroupTool';
 import { formatCoordinate } from '../utils/format';
 import { InteractionDispatcher } from '../interaction/dispatcher';
 import { logger } from '../utils/logger';
+import { CADDocument } from '../kernel/document/CADDocument';
+import { YjsDocument } from '../crdt/YjsDocument';
+import { pluginRegistry } from '../plugins';
 
 const CanvasArea: React.FC<CanvasAreaProps> = ({
   cursorPos, viewMode, onViewChange, gridEnabled, orthoEnabled, snapEnabled,
@@ -29,6 +32,8 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   const renderEngineRef = useRef<RenderEngine | null>(null);
   const interactionRef = useRef<InteractionEngine | null>(null);
   const dispatcherRef = useRef<InteractionDispatcher | null>(null);
+  /** Bereits an onElementCreated gemeldete V2-Element-IDs (verhindert Doppelmeldung bei jedem onChanged-Frame). */
+  const announcedV2Ids = useRef<Set<string>>(new Set());
   const spatialIndexRef = useRef<SpatialIndex | null>(null);
   const layerManagerRef = useRef<LayerManager | null>(null);
   const selectionEngineRef = useRef<SelectionEngine | null>(null);
@@ -47,17 +52,38 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
       canvas, zoomPan, renderEngine, snapEngine, selectionEngine, spatialIndex, layerManager,
     );
 
-    // ── Task A2: V2-Tool-Dispatcher hinter Feature-Flag ──
-    // Flag VITE_TOOL_DISPATCHER=v2 (in .env / Shell): aktiviert den neuen
-    // InteractionDispatcher parallel zur Legacy InteractionEngine.
-    // Tools mit handlers werden dann über die Plugin-API v2 geroutet.
+    // ── Task A2/A4: V2-Tool-Dispatcher hinter Feature-Flag ──
+    // Flag VITE_TOOL_DISPATCHER=v2: aktiviert den InteractionDispatcher UND
+    // verdrahtet ihn mit einem lokalen CADDocument + SelectionBridge (Task A4.1).
     if (import.meta.env.VITE_TOOL_DISPATCHER === 'v2') {
+      const ydoc = new YjsDocument();
+      ydoc.data.layers.set('layer-0', {
+        id: 'layer-0', name: 'Standard', visible: true, locked: false,
+        color: '#ffffff', lineType: 'solid', transparency: 0, sortOrder: 0, parentId: null,
+      } as never);
+      const v2Doc = new CADDocument(ydoc);
+      // Committete V2-Elemente fließen über den etablierten Kanal in UI/State:
+      v2Doc.onChanged(() => {
+        for (const el of v2Doc.getAllElements()) {
+          if (!announcedV2Ids.current.has(el.id)) {
+            announcedV2Ids.current.add(el.id);
+            onElementCreated(el);
+          }
+        }
+      });
+
       dispatcherRef.current = new InteractionDispatcher(canvas, {
         zoomPan,
         setStatus: (msg) => {
-          /* StatusBar-Bridge folgt in A3 */
+          /* StatusBar-Bridge folgt in A4 */
         },
         setPreview: (el) => renderEngine.setPreviewElement(el as CADElement | null),
+        getDoc: () => v2Doc,
+        getSelectionBridge: () => ({
+          getIds: () => Array.from(selectionEngine.getSelectedIds()),
+          setIds: (ids) => selectionEngine.selectByIds(ids, false),
+          hitTest: (wx, wy, tol) => renderEngine.hitTest(wx, wy, tol),
+        }),
       });
       logger.info('InteractionDispatcher v2 aktiviert (VITE_TOOL_DISPATCHER=v2)');
     }
@@ -249,6 +275,11 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
     const interaction = interactionRef.current;
     if (!interaction) return;
     interaction.setTool(activeTool as ToolType);
+    // Task A4.1: V2-Werkzeuge zusätzlich an den Dispatcher routen (Flag aktiv).
+    // Legacy bleibt parallel aktiv für noch nicht migrierte Tools.
+    dispatcherRef.current?.setActive(
+      pluginRegistry.getToolV2(activeTool) ? activeTool : null,
+    );
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [activeTool]);