using System;
using AibisDream.Kit;
using AibisDream.Utility;
using DG.Tweening;
using UnityEngine;

namespace AibisDream.Kit
{
    public class SpriteDeepIn : MonoBehaviour
    {
        private const int TopLayer = 20;
        private const int BottomLayer = 19;
        private const string LayerName = "FixMiddle";
        
        public Sprite[] spriteArr;

        public float duration;
        
        public event Action OnFinished;

        private SpriteRenderer _renderer1;
        private SpriteRenderer _renderer2;

        private float _curProgress;
        private int _curIndex;

        private void Update()
        {
            if (Input.GetKeyDown(KeyCode.K))
            {
                Play();
            }
        }

        public void Play()
        {
            _renderer2 = transform.Find("Renderer1").GetComponent<SpriteRenderer>();
            PlayNext();
        }

        private void PlayNext()
        {
            _curIndex++;
            // 所有图片播放完毕则退出
            if (_curIndex >= spriteArr.Length)
            {
                OnFinished?.Invoke();
                return;
            }
            // 播放下一个图片
            InitNewSprite(_curIndex);
            // 缩放
            _curProgress = 0.01f;
            DOTween.To(() => _curProgress, value => _curProgress = value, 1, duration)
                .SetEase(Ease.InQuad)
                .OnUpdate(UpdateSprite)
                .OnComplete(PlayNext);
        }
        
        private void InitNewSprite(int index)
        {
            if (_renderer1)
            {
                Destroy(_renderer1.gameObject);
            }
            
            _renderer1 = _renderer2;
            _renderer2 = new GameObject().AddComponent<SpriteRenderer>();
            _renderer2.transform.SetParent(transform);
            // 处理层级
            _renderer1.sortingLayerName = LayerName;
            _renderer1.sortingOrder = BottomLayer;
            _renderer2.sortingLayerName = LayerName;
            _renderer2.sortingOrder = TopLayer;
            _renderer2.transform.localScale = Vector3.one * 0.01f;
            // 添加图片
            _renderer2.sprite = spriteArr[index];
        }

        private void UpdateSprite()
        {
            // 大图片缩放
            _renderer1.transform.localScale = Vector3.one * (_curProgress * 100);
            // 小图片缩放
            _renderer2.transform.localScale = Vector3.one * _curProgress;
        }
    }
}