using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using BITKit;
using BITKit.Core.Entites;
using BITKit.Entities;
using UnityEngine;
using Cysharp.Threading.Tasks;
using UnityEngine.Pool;
using IEntity = BITKit.Core.Entites.IEntity;
using IEntityComponent = BITKit.Core.Entites.IEntityComponent;
[Serializable]
public class UnityEntitiesServiceSingleton:IEntitiesService
{
   public event Action<IEntity> OnAdd
   {
      add => UnityEntitiesService.OnAdd += value;
      remove => UnityEntitiesService.OnAdd -= value;
   }

   public event Action<IEntity> OnRemove
   {
      add => UnityEntitiesService.OnRemove += value;
      remove => UnityEntitiesService.OnRemove -= value;
   }

   public IEntity[] Entities => UnityEntitiesService.Entities;
   public bool Register(IEntity entity)
   {
      return UnityEntitiesService.Register(entity);
   }

   public bool UnRegister(IEntity entity)
   {
      return UnityEntitiesService.UnRegister(entity);
   }

   public CancellationToken CancellationToken => UnityEntitiesService.CancellationToken;

   public IEntity Get(ulong id) => UnityEntitiesService.Get(id);

   public IEntity[] Query<T>()
   {
      return UnityEntitiesService.Query<T>();
   }

   public T[] QueryComponents<T>()
   {
      return UnityEntitiesService.QueryComponents<T>();
   }

   public (T, T1)[] QueryComponents<T, T1>() 
   {
      return UnityEntitiesService.QueryComponents<T, T1>();
   }

   public (T, T1, T2)[] QueryComponents<T, T1, T2>()
   {
      return UnityEntitiesService.QueryComponents<T, T1, T2>();
   }
}

public class UnityEntitiesService : MonoBehaviour,IEntitiesService
{
   [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
   private static void Initialize()
   {
      Dictionary.Clear();
      RegisterQueue.Clear();
      UnRegisterQueue.Clear();
   }
   public static bool Register(IEntity entity)
   {
      RegisterQueue.Enqueue(entity);
      return true;
   }
   public static bool UnRegister(IEntity entity)
   {
      UnRegisterQueue.Enqueue(entity);
      return false;
   }
   public static CancellationToken CancellationToken;
   private static readonly ConcurrentDictionary<ulong,IEntity> Dictionary=new();
   private static readonly Queue<IEntity> RegisterQueue = new();
   private static  readonly Queue<IEntity> UnRegisterQueue = new();
   private void Awake()
   {
      CancellationToken = gameObject.GetCancellationTokenOnDestroy();
   }
   event Action<IEntity> IEntitiesService.OnAdd
   {
      add => OnAdd += value;
      remove => OnAdd -= value;
   }
   event Action<IEntity> IEntitiesService.OnRemove
   {
      add => OnRemove += value;
      remove => OnRemove -= value;
   }
   public static event Action<IEntity> OnAdd;
   public static event Action<IEntity> OnRemove;
   IEntity[] IEntitiesService.Entities => Entities;
   public static IEntity[] Entities => Dictionary.Values.ToArray();
   bool IEntitiesService.Register(IEntity entity) => Register(entity);
   bool IEntitiesService.UnRegister(IEntity entity) => UnRegister(entity);

   private void LateUpdate()
   {
      while (RegisterQueue.TryDequeue(out var entity))
      {
         Dictionary.AddOrUpdate(entity.Id,entity,(x,y)=>entity);
         OnAdd?.Invoke(entity);
      }
      while (UnRegisterQueue.TryDequeue(out var entity))
      {
         if (Dictionary.TryRemove(entity.Id))
         {
            OnRemove?.Invoke(entity);
         }
      }
   }

   CancellationToken IEntitiesService.CancellationToken => CancellationToken;
   public static IEntity Get(ulong id)=>Dictionary[id];
   IEntity IEntitiesService.Get(ulong id)=>Get(id);
   IEntity[] IEntitiesService.Query<T>()=>Query<T>();
   public static IEntity[] Query<T>()
   {
      return Entities.Where(x => ((Entity)x).TryGetComponentAny<T>(out _)).ToArray();
   }
   T[] IEntitiesService.QueryComponents<T>()=>QueryComponents<T>();
   public static T[] QueryComponents<T>()
   {
      var list = ListPool<T>.Get();
      foreach (var iEntity in Entities)
      {
         switch (iEntity as Entity)
         {
            case { } x when x.TryGetComponentAny<T>(out var t):
               list.Add((t));
               break;
         }
      }
      var value = list.ToArray();
      list.Clear();
      ListPool<T>.Release(list);
      return value;
   }
   (T, T1)[] IEntitiesService.QueryComponents<T,T1>()=>QueryComponents<T,T1>();
   public static (T, T1)[] QueryComponents<T, T1>()
   {
      var list = ListPool<(T t, T1 t1)>.Get();
      foreach (var iEntity in Entities)
      {
         switch (iEntity as Entity)
         {
            case var x when x != null && x.TryGetComponentAny<T>(out var t) && x.TryGetComponentAny<T1>(out var t1):
               list.Add((t, t1));
               break;
         }
      }
      var value = list.ToArray();
      list.Clear();
      ListPool<(T t, T1 t1)>.Release(list);
      return value;
   }
   (T, T1, T2)[] IEntitiesService.QueryComponents<T,T1,T2>()=>QueryComponents<T,T1,T2>();
   public static (T, T1, T2)[] QueryComponents<T, T1, T2>()
   {
      var list = ListPool<(T t, T1 t1, T2 t2)>.Get();
      foreach (var iEntity in Entities)
      {
         switch (iEntity as Entity)
         {
            case var x when x != null && x.TryGetComponentAny<T>(out var t) && x.TryGetComponentAny<T1>(out var t1) && x.TryGetComponentAny<T2>(out var t2):
               list.Add((t, t1, t2));
               break;
         }
      }
      var value = list.ToArray();
      list.Clear();
      ListPool<(T t, T1 t1, T2 t2)>.Release(list);
      return value;
   }
}