Fix resolve_offers_to_hub to use DISTANCE() instead of graph traversal

geo_app/schema.py

@@ -1075,14 +1075,59 @@ class Query(graphene.ObjectType):
             return []
 
     def resolve_offers_to_hub(self, info, hub_uuid, product_uuid, limit=10):
-        """Get offers for a product with routes to hub."""
-        return self.resolve_find_product_routes(
-            info,
-            product_uuid=product_uuid,
-            to_uuid=hub_uuid,
-            limit_sources=limit,
-            limit_routes=1,
-        )
+        """Get offers for a product with routes to hub using DISTANCE()."""
+        db = get_db()
+        nodes_col = db.collection('nodes')
+
+        # Get hub coordinates
+        hub = nodes_col.get(hub_uuid)
+        if not hub:
+            logger.info("Hub %s not found", hub_uuid)
+            return []
+
+        hub_lat = hub.get('latitude')
+        hub_lon = hub.get('longitude')
+        if hub_lat is None or hub_lon is None:
+            logger.info("Hub %s missing coordinates", hub_uuid)
+            return []
+
+        # Find offers for this product sorted by distance to hub
+        aql = """
+        FOR node IN nodes
+            FILTER node.node_type == 'offer'
+            FILTER node.product_uuid == @product_uuid
+            FILTER node.latitude != null AND node.longitude != null
+            LET dist = DISTANCE(node.latitude, node.longitude, @hub_lat, @hub_lon) / 1000
+            SORT dist ASC
+            LIMIT @limit
+            RETURN MERGE(node, {distance_km: dist})
+        """
+        try:
+            cursor = db.aql.execute(aql, bind_vars={
+                'product_uuid': product_uuid,
+                'hub_lat': hub_lat,
+                'hub_lon': hub_lon,
+                'limit': limit
+            })
+            offers = list(cursor)
+            logger.info("Found %d offers for product %s near hub %s", len(offers), product_uuid, hub_uuid)
+
+            results = []
+            for offer in offers:
+                # Build route for each offer
+                routes = Query._build_routes(db, offer['_key'], hub_uuid, limit=1)
+                results.append(ProductRouteOptionType(
+                    source_uuid=offer['_key'],
+                    source_name=offer.get('name'),
+                    source_lat=offer.get('latitude'),
+                    source_lon=offer.get('longitude'),
+                    distance_km=offer.get('distance_km'),
+                    routes=routes,
+                ))
+            return results
+        except Exception as e:
+            logger.error("Error getting offers to hub: %s", e)
+            return []
 
     def resolve_delivery_to_hub(self, info, offer_uuid, hub_uuid):
         """Get delivery route from offer to hub."""