using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
namespace BITKit.Entities
{
   
    public interface IEntityOverride
    {
        /// <summary>
        /// 是否正在被覆盖
        /// </summary>
        bool IsOvering { get; }
        /// <summary>
        /// 当前对象,用于判断是否是自己的覆盖
        /// </summary>
        object CurrentObject { get; }
        /// <summary>
        /// 当开始覆盖或者结束覆盖时触发
        /// </summary>
        event Action<bool> OnOverride;
        /// <summary>
        /// 添加覆盖
        /// </summary>
        void AddOverride(object key,int priority=0);
        /// <summary>
        /// 移除覆盖
        /// </summary>
        void RemoveOverride(object key,int priority=0);
        
    }
    [CustomType(typeof(IEntityOverride))]
    public class EntityOverride : EntityBehavior,IEntityOverride
    {
        [SerializeField,ReadOnly] private bool isOvering;
        [SerializeField, ReadOnly(HideLabel = true)] private string overrideKeys;
        public bool IsOvering => _allowOverrideHandle;
        public object CurrentObject => _prioritySelector.Current;
        private readonly ValidHandle _allowOverrideHandle = new();
        
        private readonly PrioritySelector<object> _prioritySelector = new();
        public void AddOverride(object key,int priority=0)
        {
            _prioritySelector.Set(priority,key);
            _allowOverrideHandle.AddElement(key);
        }
        public void RemoveOverride(object key,int priority=0)
        {
            _prioritySelector.Remove(priority);
            _allowOverrideHandle.RemoveElement(key);
        }

        public event Action<bool> OnOverride;

        public override void Initialize(IEntity entity)
        {
            base.Initialize(entity);
            UnityEntity.Set<IEntityOverride>(this);
        }
        public override void OnAwake()
        {
            _allowOverrideHandle.AddListener(Override);
            _allowOverrideHandle.Invoke();
        }
        private void Override(bool @override)
        {
            OnOverride?.Invoke(@override);
            isOvering=@override;
            overrideKeys = _allowOverrideHandle.ToString();
        }
    }
}