add patches to enable Ref trader in PVE mode

project/SPT.SinglePlayer/Patches/MainMenu/EnableRefForPVEPatch.cs

@@ -0,0 +1,55 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using EFT.UI;
+using HarmonyLib;
+using System.Reflection.Emit;
+using SPT.Reflection.CodeWrapper;
+using SPT.Reflection.Patching;
+
+namespace SPT.SinglePlayer.Patches.MainMenu
+{
+    /// <summary>
+    /// All we want to do with this TranspilePatch is to replace the Ref ID they check for to something different
+    /// so this allows the Ref trader to be shown on the TraderScreensGroup
+    /// </summary>
+    public class EnableRefForPVEPatch : ModulePatch
+    {
+        protected override MethodBase GetTargetMethod()
+        {
+            return AccessTools.Method(typeof(TraderScreensGroup), nameof(TraderScreensGroup.method_4));
+        }
+
+        [PatchTranspiler]
+        private static IEnumerable<CodeInstruction> PatchTranspile(IEnumerable<CodeInstruction> instructions)
+        {
+            var codes = new List<CodeInstruction>(instructions);
+            var searchCode = new CodeInstruction(OpCodes.Ldstr, "6617beeaa9cfa777ca915b7c");
+            var searchIndex = -1;
+            
+            for (var i = 0; i < codes.Count; i++)
+            {
+                if (codes[i].opcode == searchCode.opcode && codes[i]?.operand == searchCode?.operand)
+                {
+                    searchIndex = i;
+                    break;
+                }
+            }
+
+            if (searchIndex == -1)
+            {
+                Logger.LogError($"{nameof(EnableRefForPVEPatch)} failed: Could not find reference code.");
+                return instructions;
+            }
+
+            // this doesnt have to be anything perticular for the string - just cant be a trader ID
+            var newCode = new CodeInstruction(OpCodes.Ldstr, "SPT-PVE");
+
+            codes.RemoveAt(searchIndex);
+            searchIndex -= 1;
+            codes.Insert(searchIndex, newCode);
+            
+            return codes.AsEnumerable();
+        }
+    }
+}

project/SPT.SinglePlayer/Patches/MainMenu/EnableRefIntermScreenPatch.cs

@@ -0,0 +1,25 @@
+using System.Reflection;
+using EFT.UI;
+using HarmonyLib;
+using SPT.Reflection.Patching;
+
+namespace SPT.SinglePlayer.Patches.MainMenu
+{
+    /// <summary>
+    /// Remove BSG's check for Ref as the TraderID so we get Ref on the interm screen
+    /// </summary>
+    public class EnableRefIntermScreenPatch : ModulePatch
+    {
+        protected override MethodBase GetTargetMethod()
+        {
+            return AccessTools.Method(typeof(MerchantsList.Class2713), nameof(MerchantsList.Class2713.method_0));
+        }
+
+        [PatchPrefix]
+        private static bool PatchPrefix(ref bool __result)
+        {
+            __result = false;
+            return false; // Do not run original method
+        }
+    }
+}

project/SPT.SinglePlayer/SPTSingleplayerPlugin.cs

@@ -74,6 +74,8 @@ namespace SPT.SinglePlayer
                 new ArmorDamageCounterPatch().Enable();
                 new PVEModeWelcomeMessagePatch().Enable();
                 new DisableMatchmakerPlayerPreviewButtonsPatch().Enable();
+                new EnableRefForPVEPatch().Enable();
+                new EnableRefIntermScreenPatch().Enable();
             }
             catch (Exception ex)
             {