using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using DG.Tweening;

namespace MapUnit
{

    /// <summary>
    /// 消融控制
    /// </summary>
    public class LoopClip : MonoBehaviour
    {
        new public Renderer renderer = null;

        public float from;
        public float to;
        public float speed = 1.0f;

        private float t;
        private Material m;

        private Vector3 startPos;

        

        private void Start()
        {
            startPos = this.transform.localPosition;

            t = 0.0f;
            if (renderer == null)
            {
                return;
            }
            m = renderer.material;
            
        }


        // Update is called once per frame
        void Update()
        {
        
        }


        private void OnEnable()
        {
            if (renderer == null)
            {
                return;
            }
            m = renderer.material;
            m.SetFloat("_Clip", 1.5f);
        }

        private void OnDisable()
        {
            m.SetFloat("_Clip", -0.5f);
        }

        /// <summary>
        /// 显示
        /// </summary>
        /// <returns></returns>
        public IEnumerator OnShow(Action finishHandel = null)
        {
            yield return new WaitForEndOfFrame();
           
            while (true)
            {
                yield return new WaitForEndOfFrame();
                if (speed < 0.0f)
                {
                    speed = 0.0f;
                }
                t += Time.deltaTime * speed;
                if (t > 1.0f)
                {
                    t = 0.0f;
                    break;
                }
                float _lerpVal = Mathf.Lerp(from, to, t);
            
                m.SetFloat("_Clip", _lerpVal);

            }
            finishHandel?.Invoke();
        }

        /// <summary>
        /// 隐藏
        /// </summary>
        /// <returns></returns>
        public IEnumerator OnHide(Action finishHandel = null)
        {
            yield return new WaitForEndOfFrame();
         
            while (true)
            {
                yield return new WaitForEndOfFrame();
                if (speed < 0.0f)
                {
                    speed = 0.0f;
                }
                t += Time.deltaTime * (speed+0.5f) ;
                if (t > 1.0f)
                {
                    t = 0.0f;
                    break;
                }
                m.SetFloat("_Clip", Mathf.Lerp(to, from, t));

            }

            finishHandel?.Invoke();
        }
    }

}