using System.Collections;
using System.Collections.Generic;
using Convention;
using UnityEngine;

namespace Demo.Game
{
    public class LookAtAnchor : Updatement<string>
    {
        public static LookAtAnchor Make()
        {
            return new GameObject().AddComponent<LookAtAnchor>();
        }

        protected override string Lerp(string begin, string end, float t)
        {
            return begin;
        }

        [Content, SerializeField] private string Cache;
        [Content] public ScriptableObject LookAtObject;
        [Content] public bool IsEnableUpdateEveryTick = false;

        protected override void UpdateData(string data)
        {
            if (Cache != data)
            {
                LookAtObject = FindWithPath(data, false);
                Cache = data;
                Foo();
            }
            if (IsEnableUpdateEveryTick)
            {
                Foo();
            }

            void Foo()
            {
                if (LookAtObject != null)
                    transform.LookAt(LookAtObject.transform);
            }
        }

        public override IEnumerator UnloadScript()
        {
            Cache = null;
            yield return base.UnloadScript();
        }

        /// <summary>
        /// 在指定时刻切换面向的物体，并尝试一次更新
        /// </summary>
        /// <param name="time"></param>
        /// <param name="target">对象相对路径，不存在时将解除锁定</param>
        [Convention.RScript.Variable.Attr.Method]
        public void Add(string time, string target)
        {
            ManualAddEntry(time, target, default);
        }

        /// <summary>
        /// 启动自动更新，将持续锁定面向的物体并更新
        /// </summary>
        [Convention.RScript.Variable.Attr.Method]
        public void EnableUpdateEveryTick()
        {
            IsEnableUpdateEveryTick = true;
        }
    }
}