CLre/CLre/API/Engines/FrontEndEngines.cs

using System.Reflection;
using HarmonyLib;
using Svelto.DataStructures;
using Svelto.ECS;

namespace CLre.API.Engines
{
    /// <summary>
    /// Engine to be registered before vanilla engines are built.
    /// This should be called by any other constructor because this alerts CLre of its existence.
    /// </summary>
    public abstract class FrontEndEnginePreBuild : ICLreEngine
    {
        /// <summary>
        /// Construct a new instance of a FrontEndEngine.
        /// This should be called by any other constructor because this alerts CLre of its existence.
        /// </summary>
        public FrontEndEnginePreBuild()
        {
            MainFrontEnd_BuildEngines_Patch.beforeBuildEngines.Add(this);
        }

        public abstract void Ready();
        public abstract IEntitiesDB entitiesDB { get; set; }
        public abstract IEntityFactory entityFactory { get; set; }
    }
    
    /// <summary>
    /// Engine to be registered before obsolete vanilla engines are built.
    /// This should be called by any other constructor because this alerts CLre of its existence.
    /// </summary>
    public abstract class FrontEndObsoleteEnginePreBuild : ICLreEngine
    {
        /// <summary>
        /// Construct a new instance of a FrontEndEngine.
        /// This should be called by any other constructor because this alerts CLre of its existence.
        /// </summary>
        public FrontEndObsoleteEnginePreBuild()
        {
            MainFrontEnd_BuildObsoleteEngines_Patch.beforeBuildEngines.Add(this);
        }

        public abstract void Ready();
        public abstract IEntitiesDB entitiesDB { get; set; }
        public abstract IEntityFactory entityFactory { get; set; }
    }
    
    /// <summary>
    /// Engine to be registered after vanilla engines are built.
    /// </summary>
    public abstract class FrontEndEnginePostBuild : ICLreEngine
    {
        /// <summary>
        /// Construct a new instance of a FrontEndEngine.
        /// This should be called by any other constructor because this alerts CLre of its existence.
        /// </summary>
        public FrontEndEnginePostBuild()
        {
            MainFrontEnd_BuildEngines_Patch.afterBuildEngines.Add(this);
        }

        public abstract void Ready();
        public abstract IEntitiesDB entitiesDB { get; set; }
        public abstract IEntityFactory entityFactory { get; set; }
    }
    
    /// <summary>
    /// Engine to be registered after vanilla obsolete engines are built.
    /// </summary>
    public abstract class FrontEndObsoleteEnginePostBuild : ICLreEngine
    {
        /// <summary>
        /// Construct a new instance of a FrontEndEngine.
        /// This should be called by any other constructor because this alerts CLre of its existence.
        /// </summary>
        public FrontEndObsoleteEnginePostBuild()
        {
            MainFrontEnd_BuildObsoleteEngines_Patch.afterBuildEngines.Add(this);
        }

        public abstract void Ready();
        public abstract IEntitiesDB entitiesDB { get; set; }
        public abstract IEntityFactory entityFactory { get; set; }
    }

    [HarmonyPatch(typeof(FrontEnd.MainFrontEnd), "BuildEngines")]
    class MainFrontEnd_BuildEngines_Patch
    {
        internal static FasterList<FrontEndEnginePreBuild> beforeBuildEngines = new FasterList<FrontEndEnginePreBuild>();
        
        internal static FasterList<FrontEndEnginePostBuild> afterBuildEngines = new FasterList<FrontEndEnginePostBuild>();
        
        internal static MethodInfo addEngine = AccessTools.Method(typeof(FrontEnd.MainFrontEnd), "AddEngine");
        
        [HarmonyPrefix]
        public static void BeforeMethodCall(FrontEnd.MainFrontEnd __instance)
        {
            IEntityFactory factory = AccessTools.Field(typeof(FrontEnd.MainFrontEnd), "_entityFactory").GetValue(__instance) as IEntityFactory;
            foreach (ICLreEngine e in beforeBuildEngines)
            {
                e.entityFactory = factory;
                addEngine.Invoke(__instance, new object[] {e}); // __instance.AddEngine(e);
            }
        }
        
        [HarmonyPostfix]
        public static void AfterMethodCall(FrontEnd.MainFrontEnd __instance)
        {
            IEntityFactory factory = AccessTools.Field(typeof(FrontEnd.MainFrontEnd), "_entityFactory").GetValue(__instance) as IEntityFactory;
            foreach (ICLreEngine e in afterBuildEngines)
            {
                e.entityFactory = factory;
                addEngine.Invoke(__instance, new object[] {e}); // __instance.AddEngine(e);
            }
        }
    }
    
    [HarmonyPatch(typeof(FrontEnd.MainFrontEnd), "BuildObsoleteEngines")]
    class MainFrontEnd_BuildObsoleteEngines_Patch
    {
        internal static FasterList<FrontEndObsoleteEnginePreBuild> beforeBuildEngines = new FasterList<FrontEndObsoleteEnginePreBuild>();
        
        internal static FasterList<FrontEndObsoleteEnginePostBuild> afterBuildEngines = new FasterList<FrontEndObsoleteEnginePostBuild>();
        
        internal static MethodInfo addEngine = AccessTools.Method(typeof(FrontEnd.MainFrontEnd), "AddEngine");
        
        [HarmonyPrefix]
        public static void BeforeMethodCall(FrontEnd.MainFrontEnd __instance)
        {
            IEntityFactory factory = AccessTools.Field(typeof(FrontEnd.MainFrontEnd), "_entityFactory").GetValue(__instance) as IEntityFactory;
            foreach (ICLreEngine e in beforeBuildEngines)
            {
                e.entityFactory = factory;
                addEngine.Invoke(__instance, new object[] {e}); // __instance.AddEngine(e);
            }
        }
        
        [HarmonyPostfix]
        public static void AfterMethodCall(FrontEnd.MainFrontEnd __instance)
        {
            IEntityFactory factory = AccessTools.Field(typeof(FrontEnd.MainFrontEnd), "_entityFactory").GetValue(__instance) as IEntityFactory;
            foreach (ICLreEngine e in afterBuildEngines)
            {
                e.entityFactory = factory;
                addEngine.Invoke(__instance, new object[] {e}); // __instance.AddEngine(e);
            }
        }
    }
}