using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class MultiSubCanvasClickHandler : MonoBehaviour
{
    public static MultiSubCanvasClickHandler Instance;

    public Camera targetCamera; // 目标相机，用于发射射线
    public RawImage rawImage; // 需要判断点击位置的 RawImage
    public float maxRaycastDistance = 100f; // 射线最大检测距离
    public bool IsUse=false;

    private void Awake()
    {
        Instance = this;
    }

    void Update()
    {
        if(IsUse)
        {
            // 检测鼠标左键按下事件
            if (Input.GetMouseButtonDown(0))
            {
                // 获取鼠标点击位置
                Vector2 mousePosition = Input.mousePosition;

                // 将鼠标点击位置转换为 RawImage 的局部坐标
                RectTransformUtility.ScreenPointToLocalPointInRectangle(
                    rawImage.rectTransform,
                    mousePosition,
                    null,
                    out Vector2 localPoint//返回的局部坐标
                );

                // 将局部坐标转换为归一化坐标,通过RawImage的长宽比
                Rect rect = rawImage.rectTransform.rect;
                float normalizedX = (localPoint.x - rect.x) / rect.width;
                float normalizedY = (localPoint.y - rect.y) / rect.height;

                // 打印归一化坐标
                //Debug.Log($"Click Position: ({normalizedX}, {normalizedY})");

                // 判断点击位置是否在 RawImage 范围内
                if (normalizedX >= 0 && normalizedX <= 1 && normalizedY >= 0 && normalizedY <= 1)
                {
                    //Debug.Log("Click is within RawImage bounds.");

                    // 将归一化坐标转换为目标相机画面的屏幕坐标
                    Vector3 screenPoint = new Vector3(
                        normalizedX * targetCamera.pixelWidth,
                        normalizedY * targetCamera.pixelHeight,
                        targetCamera.nearClipPlane
                    );

                    // 从目标相机发射射线
                    Ray ray = targetCamera.ScreenPointToRay(screenPoint);
                    RaycastHit hit;

                    // 绘制射线，无论是否击中物体
                    if (Physics.Raycast(ray, out hit, maxRaycastDistance))
                    {
                        // 如果射线打中了某个物体
                        //Debug.Log("Hit: " + hit.transform.gameObject.name);

                        GuoLuHowMsgs.Instance.ShowCoreMsg(hit.transform.gameObject.name);

                        // 绘制射线到击中点
                        //Debug.DrawRay(ray.origin, ray.direction * hit.distance, Color.red, 5);
                    }
                    else
                    {
                        // 如果射线没有击中任何物体，绘制射线到最大距离
                        //Debug.Log("Hit: Nothing");

                        //GuoLuHowMsgs.Instance.ShowCoreMsg("Nothing");
                        // 绘制射线到最大距离
                        //Debug.DrawRay(ray.origin, ray.direction * maxRaycastDistance, Color.red, 5);
                    }

                }
            }
        }

    }
}