Add incompatible lobby host version message

Author: michael-r-elp

MultiplayerCore/Patches/MultiplayerUnavailableReasonPatches.cs

@@ -66,12 +66,47 @@ private static bool LocalizeMultiplayerUnavailableReason(MultiplayerUnavailableR
                 var metadata = PluginManager.GetPluginFromId(_requiredMod);
                 __result = $"Multiplayer Unavailable\nMod {metadata.Name} is missing or out of date\nPlease install version {_requiredVersion} or newer";
                 return false;
-            } else if (multiplayerUnavailableReason == (MultiplayerUnavailableReason)6)
+            }
+            if (multiplayerUnavailableReason == (MultiplayerUnavailableReason)6)
             {
-                __result = $"Multiplayer Unavailable\nBeat Saber version is too new\nMaximum version: {_maximumBsVersion}\nCurrent version: {UnityGame.GameVersion.ToString()}";
+                __result = $"Multiplayer Unavailable\nBeat Saber version is too new\nMaximum version: {_maximumBsVersion}\nCurrent version: {UnityGame.GameVersion}";
                 return false;
             }
             return true;
         }
-    }
+
+        [HarmonyPrefix]
+        [HarmonyPatch(typeof(ConnectionFailedReasonMethods), nameof(ConnectionFailedReasonMethods.LocalizedKey))]
+        private static bool LocalizeConnectionFailedReason(ConnectionFailedReason connectionFailedReason,
+	        ref string __result)
+        {
+	        if (connectionFailedReason == (ConnectionFailedReason)50)
+	        {
+                //__result = "CONNECTION_FAILED_VERSION_MISMATCH"; // Would show an "Update the game message"
+                __result =
+                 $"Game Version Mismatch\n" +
+                 $"Your Beat Saber version is not compatible with the lobby hosts\n" +
+                 $"You may need to either downgrade or update your game";
+                return false;
+	        }
+
+	        return true;
+        }
+
+		[HarmonyPrefix]
+        [HarmonyPatch(typeof(MultiplayerPlacementErrorCodeMethods), nameof(MultiplayerPlacementErrorCodeMethods.ToConnectionFailedReason))]
+        private static bool ToConnectionFailedReason(MultiplayerPlacementErrorCode errorCode,
+	        ref ConnectionFailedReason __result)
+        {
+            Plugin.Logger.Debug($"Got MPEC-{errorCode}");
+	        if ((int)errorCode >= 50)
+	        {
+		        __result = (ConnectionFailedReason)errorCode;
+		        return false;
+	        }
+
+	        return true;
+        }
+
+	}
 }