CLre/CLre_server/API/Engines/ServerEngines.cs

using Game.DataLoader;
using HarmonyLib;
using Svelto.DataStructures;
using Svelto.ECS;

namespace CLre_server.API.Engines
{
    public abstract class ServerEnginePreBuild : ICLreEngine
    {
        public ServerEnginePreBuild()
        {
            MainGameServer_BuildDeprecatedEngines_Patch.beforeBuildEngines.Add(this);
        }
        
        public abstract void Ready();
        public abstract IEntitiesDB entitiesDB { get; set; }
        public abstract IEntityFactory entityFactory { get; set; }
        public IDataDB dataDB { get; set; }
    }
    
    public abstract class ServerEnginePostBuild : ICLreEngine
    {
        public ServerEnginePostBuild()
        {
            MainGameServer_BuildDeprecatedEngines_Patch.afterBuildEngines.Add(this);
        }
        
        public abstract void Ready();
        public abstract IEntitiesDB entitiesDB { get; set; }
        public abstract IEntityFactory entityFactory { get; set; }
        public IDataDB dataDB { get; set; }
    }

    [HarmonyPatch(typeof(GameServer.GameFramework.MainGameServer), "BuildDeprecatedEngines")]
    class MainGameServer_BuildDeprecatedEngines_Patch
    {
        internal static FasterList<ICLreEngine> beforeBuildEngines = new FasterList<ICLreEngine>();
        
        internal static FasterList<ICLreEngine> afterBuildEngines = new FasterList<ICLreEngine>();

        [HarmonyPrefix]
        public static void BeforeMethodCall(GameServer.GameFramework.MainGameServer __instance, IEntityFactory ____entityFactory)
        {
            foreach (ICLreEngine e in beforeBuildEngines)
            {
                e.entityFactory = ____entityFactory;
                __instance.AddEngine(e);
            }
        }
        
        [HarmonyPostfix]
        public static void AfterMethodCall(GameServer.GameFramework.MainGameServer __instance, IEntityFactory ____entityFactory)
        {
            foreach (ICLreEngine e in afterBuildEngines)
            {
                e.entityFactory = ____entityFactory;
                __instance.AddEngine(e);
            }
        }
    }
}