Added DecoupledCraftNameFix

Author: jan-bures

src/CommunityFixes/Fix/DecoupledCraftNameFix/DecoupledCraftNameFix.cs

@@ -0,0 +1,81 @@
+using System.Text.RegularExpressions;
+using HarmonyLib;
+using KSP.Messages;
+using KSP.Sim.impl;
+
+namespace CommunityFixes.Fix.FairingEjectSidewaysFix;
+
+[Fix("Decoupled craft name fix")]
+public class DecoupledCraftNameFix : BaseFix
+{
+    public override void OnInitialized()
+    {
+        Messages.Subscribe<DecoupleMessage>(msg => HandleDecoupleMessage((DecoupleMessage)msg));
+        Messages.Subscribe<VesselUndockedMessage>(msg => HandleUndockMessage((VesselUndockedMessage)msg));
+
+        HarmonyInstance.PatchAll(typeof(DecoupledCraftNameFix));
+    }
+
+    private void HandleDecoupleMessage(DecoupleMessage decoupleMessage)
+    {
+        var part1Guid = new IGGuid(Guid.Parse(decoupleMessage.PartGuid));
+        var part2Guid = decoupleMessage.OtherPartGuid;
+
+        var vessel1 = Game.UniverseModel.FindPartComponent(part1Guid)?.PartOwner?.SimulationObject?.Vessel;
+        var vessel2 = Game.UniverseModel.FindPartComponent(part2Guid)?.PartOwner?.SimulationObject?.Vessel;
+
+        HandleSeparationEvent(vessel1, vessel2);
+    }
+
+    private void HandleUndockMessage(VesselUndockedMessage undockMessage)
+    {
+        VesselComponent vessel1 = undockMessage.VesselOne?.Model;
+        VesselComponent vessel2 = undockMessage.VesselTwo?.Model;
+
+        HandleSeparationEvent(vessel1, vessel2);
+    }
+
+    private void HandleSeparationEvent(VesselComponent vessel1, VesselComponent vessel2)
+    {
+        Logger.LogDebug($"Separated: {vessel1?.Name}, {vessel2?.Name}");
+
+        if (vessel2 is not { Name: var newName } ||
+            !newName.StartsWith("Default Name") ||
+            string.IsNullOrEmpty(vessel1?.Name))
+        {
+            return;
+        }
+
+        var match = Regex.Match(vessel1!.Name, @"-(\d+)$");
+        newName = match.Success
+            ? Regex.Replace(vessel1.Name, @"-\d+$", $"-{int.Parse(match.Groups[1].Value) + 1}")
+            : $"{vessel1.Name}-2";
+
+        Logger.LogDebug($"Renaming {vessel2.Name} to {newName}");
+
+        vessel2.SimulationObject.Name = newName;
+    }
+
+    [HarmonyPatch(typeof(SpaceSimulation), nameof(SpaceSimulation.CreateCombinedVesselSimObject))]
+    [HarmonyPrefix]
+    public static void CreateCombinedVesselSimObjectPrefix(
+        // ReSharper disable once InconsistentNaming
+        ref string __state,
+        VesselComponent masterVessel
+    )
+    {
+        __state = masterVessel.Name;
+    }
+
+    [HarmonyPatch(typeof(SpaceSimulation), nameof(SpaceSimulation.CreateCombinedVesselSimObject))]
+    [HarmonyPostfix]
+    public static void CreateCombinedVesselSimObjectPostfix(
+        // ReSharper disable once InconsistentNaming
+        string __state,
+        // ReSharper disable once InconsistentNaming
+        ref SimulationObjectModel __result
+    )
+    {
+        __result.Name = __state;
+    }
+}