using UnityEngine;
using UnityEngine.UI;
using DG.Tweening;

public class TestRenderTexture : MonoBehaviour
{
    // 点击RawImage时，相对RawImage自身的坐标
    private Vector2 ClickPosInRawImg;
    // 画布
    public Canvas Canvas;
    // 预览映射相机
    public Camera PreviewCamera;
    public RawImage PreviewImage;
    public Camera UiCamera;
    private Vector3 MousePos;

    [Header("课程相关")]
    public Animator leftDoor;
    public Animator rightDoor;

    void Start() { }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            MousePos = Input.mousePosition;
        }
        if (MousePos != null)
        {
            CheckDrawRayLine(Canvas, Input.mousePosition, PreviewImage, PreviewCamera);
        }
    }

    /// <summary>
    /// 射线投射
    /// </summary>
    /// <param name="canvas">画布</param>
    /// <param name="mousePosition">当前Canvas下点击的鼠标位置</param>
    /// <param name="previewImage">预览图</param>
    /// <param name="previewCamera">预览映射图的摄像机</param>
    void CheckDrawRayLine(Canvas canvas, Vector3 mousePosition, RawImage previewImage, Camera previewCamera)
    {
        // 将UI相机下点击的UI坐标转为相对RawImage的坐标
        if (RectTransformUtility.ScreenPointToLocalPointInRectangle(PreviewImage.GetComponent<RectTransform>(), mousePosition, UiCamera, out ClickPosInRawImg))
        {
            // Lylibs.MessageUtil.Show("坐标：x=" + ClickPosInRawImg.x + ",y=" + ClickPosInRawImg.y);
          // Debug.Log("坐标：x=" + ClickPosInRawImg.x + ",y=" + ClickPosInRawImg.y);
            //获取预览图的长宽
            float imageWidth = previewImage.rectTransform.rect.width;
            float imageHeight = previewImage.rectTransform.rect.height;
            //获取预览图的坐标，此处RawImage的Pivot需为(0,0)，不然自己再换算下
            float localPositionX = previewImage.rectTransform.localPosition.x;//
            float localPositionY = previewImage.rectTransform.localPosition.y;
            localPositionX = 0f;
            localPositionY = 0;
            
            //获取在预览映射相机viewport内的坐标（坐标比例）
            float p_x = (ClickPosInRawImg.x - localPositionX) / imageWidth;
            float p_y = (ClickPosInRawImg.y - localPositionY) / imageHeight;

            //从视口坐标发射线
            Ray p_ray = previewCamera.ViewportPointToRay(new Vector2(p_x, p_y));
            RaycastHit p_hitInfo;
            if (Input.GetMouseButtonDown(0))
            {
                if (Physics.Raycast(p_ray, out p_hitInfo))
                {
                    //显示射线，只有在scene视图中才能看到
                    Debug.DrawLine(p_ray.origin, p_hitInfo.point);
                    Debug.Log(p_hitInfo.transform.name);
                    if (p_hitInfo.transform.gameObject.name == "Open")
                    {
                        Debug.Log("开门");
                        leftDoor.transform.DOLocalRotate(new Vector3(0, -15, 0), 2f);
                        rightDoor.transform.DOLocalRotate(new Vector3(0, 15, 0), 2f);
                    }
                    if (p_hitInfo.transform.gameObject.name == "Close")
                    {
                        Debug.Log("关门");
                        leftDoor.transform.DOLocalRotate(new Vector3(0, -98, 0), 2f);
                        rightDoor.transform.DOLocalRotate(new Vector3(0, 105, 0), 2f);
                    }
                }
            }
            
            Debug.DrawRay(previewCamera.transform.position, p_ray.direction);
        }
    }
}