Add update load combination to adapter push

Robot_Adapter/CRUD/Update/Loads/LoadCombinations.cs

@@ -20,6 +20,7 @@
  * along with this code. If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.      
  */
 
+using System;
 using System.Collections.Generic;
 using BH.oM.Base;
 using BH.oM.Structure.Elements;
@@ -29,6 +30,7 @@
 using BH.oM.Structure.Loads;
 using BH.oM.Physical.Materials;
 using BH.oM.Adapter;
+using BH.Engine.Base;
 using RobotOM;
 
 namespace BH.Adapter.Robot
@@ -42,7 +44,63 @@ public partial class RobotAdapter
         protected bool Update(IEnumerable<LoadCombination> loadCombinations)
         {
             bool success = true;
-            success = ICreate(loadCombinations);
+
+            m_RobotApplication.Project.Structure.Cases.BeginMultiOperation();
+
+            foreach (LoadCombination lComb in loadCombinations)
+            {
+                //Check combination itself is not null
+                if (!CheckNotNull(lComb))
+                    continue;
+
+                // Use the Number property directly and try to get the combination
+                int combinationId = lComb.Number;
+
+                // Get the existing combination from Robot (following pattern from Loadcases Update method)
+                RobotCaseCombination rCaseCombination = m_RobotApplication.Project.Structure.Cases.Get(combinationId) as RobotCaseCombination;
+                if (rCaseCombination == null)
+                {
+                    Engine.Base.Compute.RecordWarning("Load combination with number " + combinationId.ToString() + " does not exist in Robot. Load combination could not be updated!");
+                    success = false;
+                    continue;
+                }
+
+                // Update the combination name if provided
+                if (!string.IsNullOrWhiteSpace(lComb.Name))
+                    rCaseCombination.Name = lComb.Name;
+
+                // Clear existing case factors by deleting them individually
+                // Note: Robot API requires deleting case factors in reverse order to avoid index shifting
+                for (int i = rCaseCombination.CaseFactors.Count; i >= 1; i--)
+                {
+                    rCaseCombination.CaseFactors.Delete(i);
+                }
+
+                // Add new case factors from the BHoM LoadCombination
+                if (lComb.LoadCases != null && lComb.LoadCases.Count > 0)
+                {
+                    for (int i = 0; i < lComb.LoadCases.Count; i++)
+                    {
+                        //Check tuple as well as case not null
+                        if (CheckNotNull(lComb.LoadCases[i], oM.Base.Debugging.EventType.Error, typeof(LoadCombination)) &&
+                            CheckNotNull(lComb.LoadCases[i].Item2, oM.Base.Debugging.EventType.Error, typeof(LoadCombination)))
+                        {
+                            System.Tuple<double, ICase> loadcase = lComb.LoadCases[i];
+                            rCaseCombination.CaseFactors.New(lComb.LoadCases[i].Item2.Number, lComb.LoadCases[i].Item1);
+                        }
+                    }
+                }
+                else
+                {
+                    Engine.Base.Compute.RecordWarning("Load combination with number " + combinationId.ToString() + " has no load cases. The combination has been cleared of all case factors.");
+                }
+
+                // Set the adapter ID to maintain the connection between BHoM and Robot objects
+                this.SetAdapterId(lComb, lComb.Number);
+            }
+
+            m_RobotApplication.Project.Structure.Cases.EndMultiOperation();
+
             return success;
         }