BITKit/Src/Unity/Scripts/Entity/Core/Entity.cs

using System;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using BITKit.Entities;
using Cysharp.Threading.Tasks;
using UnityEngine.Profiling;
using UnityEngine.UIElements;
// ReSharper disable RedundantTypeArgumentsOfMethod

namespace BITKit.Entities
{
    [CustomType(typeof(IUnityEntity))]
    [CustomType(typeof(IEntity))]
    public class Entity : MonoBehaviour, IUnityEntity
    {
       private readonly GenericEvent genericEvent = new();
       

       public ulong Id { get; set; }
        public CancellationToken CancellationToken { get; private set; }
        public IEntityBehavior[] Behaviors { get;private set; }
        public IEntityComponent[] Components => Behaviors.Cast<IEntityComponent>().ToArray();
        private bool _initialized;
        bool Entities.IEntity.RegisterComponent<T>(T component)
        {
            throw new InvalidOperationException("Unity Entity can't register component");
        }

        IServiceProvider Entities.IEntity.ServiceProvider=> throw new InvalidOperationException("Unity Entity can't register component");
        public void Inject(object obj)
        {
            foreach (var fieldInfo in obj
                         .GetType()
                         .GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
                         .Where(fieldInfo=>fieldInfo.GetCustomAttribute<InjectAttribute>(true) is not null))
            {
                var type = fieldInfo.FieldType;
                var attribute = fieldInfo.GetCustomAttribute<InjectAttribute>();
                var currentValue = fieldInfo.GetValue(obj);
                try
                {
                    switch (currentValue)
                    {
                        case null:
                            break;
                        case Entities.IEntityComponent entityComponent:
                            if(entityComponent.Entity.Id == Id)
                                continue;
                            break;
                        case MonoBehaviour { destroyCancellationToken: { IsCancellationRequested: false } }:
                            continue;
                        case not null:
                            continue;
                    }
                }
                catch (MissingReferenceException){}
                if(genericEvent.TryGetObjectDirect(type.FullName,out var value))
                {
                    fieldInfo.SetValue(obj,value);
                }
                else if(attribute?.CanBeNull is false)
                {
                    BIT4Log.Warning<Entity>($"{name}未找到{obj.GetType().Name}需要的{type.FullName}");
                    //BIT4Log.Warning<Entity>(genericEvent.GetDiagnostics());
                }
            }
        }

        public void AddService<T>(T service)
        {
            AddService(typeof(T),service);
        }

        public void AddService(object service)
        {
           AddService(service.GetType(),service);
        }

        public void AddService(Type type, object service)
        {
            genericEvent.Set(type,service);
            genericEvent.Set(type.FullName, service);
            genericEvent.SetDirect(type.FullName,service);
        }

        private bool isInitialized;
        public void WaitForInitializationComplete()
        {
            if (isInitialized) return;
            Start();
            isInitialized = true;
        }
        private void Awake()
        {
            if (Id.IsDefault())
                Id = (ulong)Guid.NewGuid().GetHashCode();
            CancellationToken = gameObject.GetCancellationTokenOnDestroy();
            Set(CancellationToken);
        }

        private void Start()
        {
            if (isInitialized) return;
            try
            {
                AddService<IEntity>(this);
                AddService<Entity>(this);
                AddService<IUnityEntity>(this);
                
                Behaviors = GetComponentsInChildren<IEntityBehavior>(true).Distinct().ToArray();
                var monoBehaviours = GetComponentsInChildren<MonoBehaviour>(true);
                Behaviors.ForEach(x => x.Initialize(this));
                foreach (var x in monoBehaviours)
                {
                    foreach (var att in x
                                 //.GetCustomAttributes<CustomTypeAttribute>()
                                 .GetType()
                                 //.GetCustomAttributes<CustomTypeAttribute>()
                                 .GetCustomAttributes()
                                 .OfType<CustomTypeAttribute>()
                            )
                    {
                        AddService(att.Type, x);
                        if (att.AsGlobal)
                            DI.Register(att.Type, x);
                    }

                    genericEvent.Set(x.GetType(),x);
                }
                foreach (var x in monoBehaviours)
                {
                  Inject(x);
                }
             
            
                Behaviors.ForEach(x => x.OnAwake());
                Behaviors.ForEach(x => x.OnStart());
                isInitialized = true;
            }
            catch (Exception e)
            {
                Debug.LogWarning(name);
                Debug.LogException(e);
            }
            UnityEntitiesService.Register(this);
            destroyCancellationToken.Register(() => UnityEntitiesService.UnRegister(this));
            _initialized = true;
        }

        private void OnDestroy()
        {
            if (!_initialized) return;
            foreach (var x in Behaviors)
            {
                x.OnDestroyComponent();
            }
        }

        private void Update()
        {
            var deltaTime = Time.fixedDeltaTime;
            foreach (var x in Behaviors)
            {
                x.OnUpdate(deltaTime);
            }
        }
        private void FixedUpdate()
        {
            var deltaTime = Time.fixedDeltaTime;
            foreach (var x in Behaviors)
            {
                x.OnFixedUpdate(deltaTime);
            }
        }
        private void LateUpdate()
        {
            var deltaTime = Time.fixedDeltaTime;
            foreach (var x in Behaviors)
            {
                x.OnLateUpdate(deltaTime);
            }
        }
        public void AddListener<T>(Action<T> action) => genericEvent.AddListener<T>(action);
        public void Invoke<T>(T value) => genericEvent.Invoke<T>(value);
        public void RemoveListener<T>(Action<T> action) => genericEvent.RemoveListener<T>(action);
        public void AddListener<T>(string key, Action<T> action) => genericEvent.AddListener<T>(key, action);
        public void Invoke<T>(string key, T value) => genericEvent.Invoke<T>(key, value);
        public void Invoke<T>() where T : new() => genericEvent.Invoke<T>();
        public void RemoveListener<T>(string key, Action<T> action) => genericEvent.RemoveListener<T>(key, action);
        public void SetDirect(int key, object value)
        {
            genericEvent.SetDirect(key, value);
        }

        public void GetDirect(int key, out object value)
        {
            genericEvent.GetDirect(key, out value);
        }

        public void GetDirect<T>(int key, out T value)
        {
            genericEvent.GetDirect(key, out value);
        }

        public T Get<T>(string key = Constant.System.Internal)
        {
            var value = genericEvent.Get<T>(key);
            if (value is not null || !typeof(T).IsAssignableFrom(typeof(Component))) return value;
            if (!TryGetComponent<T>(out var component)) return default(T);
            Set<T>(component);
            return component;
        }
        public void Set<T>(T value) => genericEvent.Set<T>(value);
        public void Set<T>(string key = Constant.System.Internal, T value = default) => genericEvent.Set<T>(key, value);
    }
#if UNITY_EDITOR
    [UnityEditor.CustomEditor(typeof(Entity))]
    public class EntityInspector : BITInspector<Entity>
    {
        public override VisualElement CreateInspectorGUI()
        {
            FillDefaultInspector();
            CreateSubTitle("Identity");
            var idLabel = root.Create<Label>();
            idLabel.text = agent.Id.ToString();
            return root;
        }
    }
#endif
}