using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.EventSystems;
using UnityEngine.XR.Interaction.Toolkit;
using System.Collections.Generic;

public class ClickOnRenderTexture : MonoBehaviour
{
    public Camera secondaryCamera; // The camera rendering the UI to the RenderTexture
    public RenderTexture renderTexture; // The RenderTexture applied to the mesh
    public MeshCollider meshCollider; // The mesh collider of the object showing the RenderTexture
    public XRRayInteractor xrRayInteractor; // The XR Ray Interactor component attached to the controller

    private void Update()
    {
        // Ensure XRRayInteractor is assigned
        if (xrRayInteractor == null)
        {
            Debug.LogWarning("XRRayInteractor not assigned!");
            return;
        }

        // Check if the XRRayInteractor is selecting an object
        if (xrRayInteractor.hasSelection)
        {
            Ray ray = new Ray(xrRayInteractor.transform.position, xrRayInteractor.transform.forward);

            // Raycast into the mesh displaying the RenderTexture
            if (Physics.Raycast(ray, out RaycastHit hit))
            {
                if (hit.collider == meshCollider) // If the ray hits the mesh with the RenderTexture
                {
                    // Get the UV coordinates of the hit point
                    Vector2 uv = hit.textureCoord;
                    Vector2 screenPoint = new Vector2(uv.x * renderTexture.width, uv.y * renderTexture.height);

                    // Simulate a UI click on the RenderTexture (mapped to the secondary camera's UI)
                    PointerEventData eventData = new PointerEventData(EventSystem.current);
                    eventData.position = screenPoint;

                    List<RaycastResult> results = new List<RaycastResult>();
                    EventSystem.current.RaycastAll(eventData, results);

                    // Execute the click event on the UI element under the ray
                    foreach (var result in results)
                    {
                        ExecuteEvents.Execute(result.gameObject, eventData, ExecuteEvents.pointerClickHandler);
                    }
                }
            }
        }
    }
}