fix(uns): enforce #122 on line reparent across clusters (final review)

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/UnsTreeService.cs

@@ -408,6 +408,41 @@ public sealed class UnsTreeService(IDbContextFactory<OtOpcUaConfigDbContext> dbF
         }
 
         db.Entry(entity).Property(e => e.RowVersion).OriginalValue = rowVersion;
+
+        // Decision #122: a reparent to a different area must not orphan driver-bound equipment
+        // from its driver's cluster.  Resolve the new area's cluster and check every bound
+        // equipment item under this line against it.
+        if (newUnsAreaId != entity.UnsAreaId)
+        {
+            var newAreaCluster = await db.UnsAreas
+                .Where(a => a.UnsAreaId == newUnsAreaId)
+                .Select(a => (string?)a.ClusterId)
+                .FirstOrDefaultAsync(ct);
+
+            if (newAreaCluster is not null)
+            {
+                var boundEquipment = await db.Equipment
+                    .Where(eq => eq.UnsLineId == unsLineId && eq.DriverInstanceId != null)
+                    .Select(eq => new { eq.EquipmentId, eq.DriverInstanceId })
+                    .ToListAsync(ct);
+
+                foreach (var eq in boundEquipment)
+                {
+                    var driverCluster = await db.DriverInstances
+                        .Where(d => d.DriverInstanceId == eq.DriverInstanceId)
+                        .Select(d => d.ClusterId)
+                        .FirstOrDefaultAsync(ct);
+
+                    if (driverCluster is not null && driverCluster != newAreaCluster)
+                    {
+                        return new UnsMutationResult(
+                            false,
+                            $"Cannot move line to area '{newUnsAreaId}': equipment '{eq.EquipmentId}' is bound to a driver in cluster '{driverCluster}' (decision #122). Re-home or unbind it first.");
+                    }
+                }
+            }
+        }
+
         entity.UnsAreaId = newUnsAreaId;
         entity.Name = name;
         entity.Notes = string.IsNullOrWhiteSpace(notes) ? null : notes;

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceAreaLineTests.cs

@@ -337,6 +337,93 @@ public sealed class UnsTreeServiceAreaLineTests
         result.Error.ShouldBe("Row no longer exists.");
     }
 
+    /// <summary>The #122 guard blocks reparenting a line to an area in a different cluster when
+    /// the line's equipment is driver-bound (the driver lives in the original cluster).</summary>
+    [Fact]
+    public async Task UpdateLine_reparent_to_other_cluster_blocked_when_driver_bound()
+    {
+        var (service, dbName) = Fresh();
+
+        byte[] rv;
+        using (var db = UnsTreeTestDb.CreateNamed(dbName))
+        {
+            // Source area A1 in cluster MAIN.
+            db.UnsAreas.Add(new UnsArea { UnsAreaId = "A1-MAIN", ClusterId = "MAIN", Name = "area-main" });
+            // Target area A2 in cluster SITE-A.
+            db.UnsAreas.Add(new UnsArea { UnsAreaId = "A2-SITE-A", ClusterId = "SITE-A", Name = "area-site-a" });
+            db.UnsLines.Add(new UnsLine { UnsLineId = "LINE-BOUND", UnsAreaId = "A1-MAIN", Name = "line" });
+            db.DriverInstances.Add(new DriverInstance
+            {
+                DriverInstanceId = "DRV-MAIN-122",
+                ClusterId = "MAIN",
+                NamespaceId = "NS-1",
+                Name = "drv",
+                DriverType = "ModbusTcp",
+                DriverConfig = "{}",
+            });
+            db.Equipment.Add(new Equipment
+            {
+                EquipmentId = "EQ-LINE-BOUND",
+                EquipmentUuid = Guid.NewGuid(),
+                UnsLineId = "LINE-BOUND",
+                Name = "eq",
+                MachineCode = "mc_line_bound",
+                DriverInstanceId = "DRV-MAIN-122",
+            });
+            db.SaveChanges();
+            rv = db.UnsLines.Single(l => l.UnsLineId == "LINE-BOUND").RowVersion;
+        }
+
+        var result = await service.UpdateLineAsync("LINE-BOUND", "line", null, "A2-SITE-A", rv);
+
+        result.Ok.ShouldBeFalse();
+        result.Error.ShouldNotBeNull();
+        result.Error.ShouldContain("decision #122");
+        result.Error.ShouldContain("EQ-LINE-BOUND");
+        result.Error.ShouldContain("A2-SITE-A");
+        result.Error.ShouldContain("MAIN");
+
+        // The line must not have moved.
+        using var verify = UnsTreeTestDb.CreateNamed(dbName);
+        verify.UnsLines.Single(l => l.UnsLineId == "LINE-BOUND").UnsAreaId.ShouldBe("A1-MAIN");
+    }
+
+    /// <summary>The #122 guard allows reparenting a line to an area in a different cluster when
+    /// the line's equipment is driver-less (DriverInstanceId == null).</summary>
+    [Fact]
+    public async Task UpdateLine_reparent_to_other_cluster_allowed_when_equipment_driverless()
+    {
+        var (service, dbName) = Fresh();
+
+        byte[] rv;
+        using (var db = UnsTreeTestDb.CreateNamed(dbName))
+        {
+            db.UnsAreas.Add(new UnsArea { UnsAreaId = "A1-FREE", ClusterId = "MAIN", Name = "area-main" });
+            db.UnsAreas.Add(new UnsArea { UnsAreaId = "A2-FREE", ClusterId = "SITE-A", Name = "area-site-a" });
+            db.UnsLines.Add(new UnsLine { UnsLineId = "LINE-FREE", UnsAreaId = "A1-FREE", Name = "line" });
+            db.Equipment.Add(new Equipment
+            {
+                EquipmentId = "EQ-LINE-FREE",
+                EquipmentUuid = Guid.NewGuid(),
+                UnsLineId = "LINE-FREE",
+                Name = "eq",
+                MachineCode = "mc_line_free",
+                DriverInstanceId = null,
+            });
+            db.SaveChanges();
+            rv = db.UnsLines.Single(l => l.UnsLineId == "LINE-FREE").RowVersion;
+        }
+
+        var result = await service.UpdateLineAsync("LINE-FREE", "line", null, "A2-FREE", rv);
+
+        result.Ok.ShouldBeTrue();
+        result.Error.ShouldBeNull();
+
+        // The line's UnsAreaId must have changed to A2-FREE.
+        using var verify = UnsTreeTestDb.CreateNamed(dbName);
+        verify.UnsLines.Single(l => l.UnsLineId == "LINE-FREE").UnsAreaId.ShouldBe("A2-FREE");
+    }
+
     // ----- DeleteLine -----
 
     /// <summary>Deleting a line removes the row.</summary>