using UnityEngine;

namespace AibisDream.Kit
{
    public class RepeatTrack : MonoBehaviour
    {
        public Sprite sprite;
        public float width;
        public float moveSpeed;

        private SpriteRenderer _renderer1;
        private SpriteRenderer _renderer2;

        private void Start()
        {
            _renderer1 = GeneNewRenderer();
            _renderer1.transform.localPosition = Vector3.zero;
        }
        
        private SpriteRenderer GeneNewRenderer()
        {
            var newRenderer = new GameObject().AddComponent<SpriteRenderer>();
            newRenderer.sprite = sprite;
            newRenderer.transform.SetParent(transform);
            newRenderer.sortingOrder = 5;
            newRenderer.sortingLayerName = "FixMiddle";
            newRenderer.maskInteraction = SpriteMaskInteraction.VisibleInsideMask;

            return newRenderer;
        }
        
        public void Update()
        {
            // Debug.Log("render" + _renderer1);
            // Debug.Log("bounds" + _renderer1.bounds);
            // Debug.Log("size" + _renderer1.bounds.size);
            var spriteWidth = _renderer1.bounds.size.x;
            if (-_renderer1.transform.localPosition.x + width > spriteWidth && !_renderer2)
            {
                // 可以新建下一个了
                _renderer2 = GeneNewRenderer();
                _renderer2.transform.localPosition = new Vector3(width, 0, 0);
            }
            
            if (-_renderer1.transform.localPosition.x > spriteWidth)
            {
                Destroy(_renderer1.gameObject);
                _renderer1 = _renderer2;
                _renderer2 = null;
            }
            
            _renderer1.transform.localPosition =
                new Vector3(_renderer1.transform.localPosition.x + moveSpeed * Time.deltaTime, 0, 0);
            if (_renderer2)
            {
                _renderer2.transform.localPosition =
                    new Vector3(_renderer2.transform.localPosition.x + moveSpeed * Time.deltaTime, 0, 0);
            }
        }
    }
}