From 67c195034d91c2459daa9938f75dbdb7e63ec617 Mon Sep 17 00:00:00 2001
From: Maplewheels <njainanan@hotmail.com>
Date: Sat, 7 Feb 2026 22:58:56 -0500
Subject: [PATCH] Network Sync work. Added network unique key.

---
 .../SharedSource/LuaCs/LuaCsSetup.cs          |  1 +
 .../LuaCs/_Networking/INetworkIdProvider.cs   | 37 +++++++++++++++++
 .../LuaCs/_Networking/INetworkSyncEntity.cs   |  2 +-
 .../LuaCs/_Networking/NetworkingIdProvider.cs | 41 +++++++++++++++++++
 4 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkIdProvider.cs
 create mode 100644 Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/NetworkingIdProvider.cs

diff --git a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs
index b37b3d49b..78622d75a 100644
--- a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs
+++ b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs
@@ -195,6 +195,7 @@ namespace Barotrauma
             servicesProvider.RegisterServiceType<IParserServiceAsync<ResourceParserInfo, IConfigResourceInfo>, ModConfigFileParserService>(ServiceLifetime.Transient);
             servicesProvider.RegisterServiceType<IParserServiceOneToManyAsync<IConfigResourceInfo, IConfigInfo>, SettingsFileParserService>(ServiceLifetime.Transient);
             servicesProvider.RegisterServiceType<IParserServiceOneToManyAsync<IConfigResourceInfo, IConfigProfileInfo>, SettingsFileParserService>(ServiceLifetime.Transient);
+            servicesProvider.RegisterServiceType<INetworkIdProvider, NetworkingIdProvider>(ServiceLifetime.Transient);
             
             // All Lua Extras
             servicesProvider.RegisterServiceType<IDefaultLuaRegistrar, DefaultLuaRegistrar>(ServiceLifetime.Singleton);
diff --git a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkIdProvider.cs b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkIdProvider.cs
new file mode 100644
index 000000000..441f6e8bc
--- /dev/null
+++ b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkIdProvider.cs
@@ -0,0 +1,37 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using Barotrauma.Items.Components;
+using Barotrauma.LuaCs.Data;
+
+namespace Barotrauma.LuaCs;
+
+/// <summary>
+/// Provides a deterministic ID for a given <see cref="IDataInfo"/> instance under multiple circumstances, for use with
+/// network synchronization.
+/// </summary>
+internal interface INetworkIdProvider : IService
+{
+    /// <summary>
+    /// Deterministically generates a GUID for the given parameters.
+    /// </summary>
+    /// <param name="instance">The instance.</param>
+    /// <returns>The GUID for the entity.</returns>
+    Guid GetNetworkIdForInstance([NotNull] IDataInfo instance);
+    
+    /// <summary>
+    /// Deterministically generates a GUID for the given parameters.
+    /// </summary>
+    /// <param name="instance">The instance.</param>
+    /// <param name="attachedEntity">The <see cref="Entity"/> that this instance is attached to, if any.</param>
+    /// <typeparam name="TEntity">The entity type, if any.</typeparam>
+    /// <returns>The GUID for the entity.</returns>
+    Guid GetNetworkIdForInstance<TEntity>([NotNull] IDataInfo instance, TEntity attachedEntity) where TEntity : Entity;
+    
+    /// <summary>
+    /// Deterministically generates a GUID for the given parameters.
+    /// </summary>
+    /// <param name="instance">The instance.</param>
+    /// <param name="attachedItemComponent">The <see cref="ItemComponent"/> that this instance is attached to, if any.</param>
+    /// <returns>The GUID for the entity.</returns>
+    Guid GetNetworkIdForInstance([NotNull] IDataInfo instance, [MaybeNull] ItemComponent attachedItemComponent);
+}
diff --git a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkSyncEntity.cs b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkSyncEntity.cs
index 75ec9d865..a13e0a190 100644
--- a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkSyncEntity.cs
+++ b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/INetworkSyncEntity.cs
@@ -5,7 +5,7 @@ using Barotrauma.Networking;
 
 namespace Barotrauma.LuaCs;
 
-public interface INetworkSyncVar
+public interface INetworkSyncVar : IDataInfo
 {
     /// <summary>
     /// Network-synchronized object ID. Used for networking send/receive message events.
diff --git a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/NetworkingIdProvider.cs b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/NetworkingIdProvider.cs
new file mode 100644
index 000000000..a3b2157c2
--- /dev/null
+++ b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/_Networking/NetworkingIdProvider.cs
@@ -0,0 +1,41 @@
+using System;
+using Barotrauma.Items.Components;
+using Barotrauma.LuaCs.Data;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Barotrauma.LuaCs;
+
+internal class NetworkingIdProvider : INetworkIdProvider
+{
+    public void Dispose()
+    {
+        //stateless service
+    }
+
+    public bool IsDisposed => false;
+
+    private Guid GetNetworkIdFromStringMd5(string id)
+    {
+        return new Guid(MD5.Create().ComputeHash(Encoding.ASCII.GetBytes(id)));
+    }
+    
+    public Guid GetNetworkIdForInstance(IDataInfo instance)
+    {
+        var str = $"{instance.OwnerPackage.Name}.{instance.InternalName}";
+        return GetNetworkIdFromStringMd5(str);
+    }
+
+    public Guid GetNetworkIdForInstance<TEntity>(IDataInfo instance, TEntity attachedEntity) where TEntity : Entity
+    {
+        var str = $"{nameof(TEntity)}({attachedEntity.ID}).{instance.OwnerPackage.Name}.{instance.InternalName}";
+        return GetNetworkIdFromStringMd5(str);
+    }
+
+    public Guid GetNetworkIdForInstance(IDataInfo instance, ItemComponent attachedItemComponent)
+    {
+        var attachedEntity = attachedItemComponent.Item;
+        var str = $"{attachedEntity.GetType().Name}({attachedEntity.ID}).ComponentId({attachedEntity.Components.IndexOf(attachedItemComponent)}).{instance.OwnerPackage.Name}.{instance.InternalName}";
+        return GetNetworkIdFromStringMd5(str);
+    }
+}