using System.Threading;
using System;
using System.ComponentModel.Design;
#if NET5_0_OR_GREATER
using Microsoft.Extensions.DependencyInjection;
#endif
namespace BITKit.Entities
{
    /// <summary>
    /// 基本实体
    /// </summary>
    public interface IEntity
    {
        ulong Id { get; }
        CancellationToken CancellationToken { get; }
        bool TryGetComponent<T>(out T component);
        IEntityComponent[] Components { get; }
        bool RegisterComponent<T>(T component);
        IServiceProvider ServiceProvider { get; }
        #if NET5_0_OR_GREATER
        IServiceCollection ServiceCollection { get; }
        #endif
        void Inject(object obj);
    }
    /// <summary>
    /// 基本实体组件
    /// </summary>
    public interface IEntityComponent
    {
        IEntity Entity { get; set; }
        #if NET5_0_OR_GREATER
        void BuildService(IServiceCollection serviceCollection);
        #endif
    }
    public interface IEntityBehavior:IEntityComponent
    {
        void Initialize(IEntity _entity);
        void OnAwake();
        void OnStart();
        void OnUpdate(float deltaTime);
        void OnFixedUpdate(float deltaTime);
        void OnLateUpdate(float deltaTime);
        void OnDestroyComponent();
    }
    /// <summary>
    /// 基本实体服务
    /// </summary>
    public interface IEntitiesService
    {
        /// <summary>
        /// 当添加Entity时
        /// </summary>
        public event Action<IEntity> OnAdd;
        /// <summary>
        /// 当移除Entity时
        /// </summary>
        public event Action<IEntity> OnRemove;
        /// <summary>
        /// 所有Entity
        /// </summary>
        IEntity[] Entities { get; }
        /// <summary>
        /// 注册Entity
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        bool Register(IEntity entity);
        /// <summary>
        /// 注销Entity
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        bool UnRegister(IEntity entity);
        CancellationToken CancellationToken { get; }
        /// <summary>
        /// 通过Id获取Entity
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        IEntity Get(ulong id);

        /// <summary>
        /// 查询Entity,例如
        /// </summary>
        /// <para>var rotationEntities=EntitiesService.Query&lt;RotationComponent&gt;</para>
        IEntity[] Query<T>();

        /// <summary>
        /// 查询1个组件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        T[] QueryComponents<T>();

        /// <summary>
        /// 查询2个组件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="T1"></typeparam>
        /// <returns></returns>
        ValueTuple<T, T1>[] QueryComponents<T, T1>();

        /// <summary>
        /// 查询3个组件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="T1"></typeparam>
        /// <typeparam name="T2"></typeparam>
        /// <returns></returns>
        ValueTuple<T, T1, T2>[] QueryComponents<T, T1, T2>();

    }
}