using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.XR;

public class CameraEyeRotator : MonoBehaviour
{
    [SerializeField] [VectorRange(-90, 90, -90, 90, true)] Vector2 leftEyeRotation = Vector2.zero;
    [SerializeField] [VectorRange(-90, 90, -90, 90, true)] Vector2 rightEyeRotation = Vector2.zero;
    [SerializeField] Camera referenceCamera;

    public Vector4 CamData => new Vector4(leftEyeRotation.x, leftEyeRotation.y, rightEyeRotation.x, rightEyeRotation.y);

    private void Awake()
    {
        XRSettings.gameViewRenderMode = GameViewRenderMode.BothEyes;
    }

    void OnEnable()
    {
        RenderPipelineManager.beginCameraRendering += RenderPipelineManager_beginCameraRendering;
    }

    void OnDisable()
    {
        RenderPipelineManager.beginCameraRendering -= RenderPipelineManager_beginCameraRendering;
    }

    private void RenderPipelineManager_beginCameraRendering(ScriptableRenderContext context, Camera camera)
    {
        if (camera.gameObject == gameObject)
        {
            // Disable frustrum culling
            Camera.main.cullingMatrix = Matrix4x4.Ortho(-99999, 99999, -99999, 99999, 0.001f, 99999) *
                                Matrix4x4.Translate(Vector3.forward * -99999 / 2f) *
                                referenceCamera.worldToCameraMatrix;

            // Get view matrices from reference camera
            Matrix4x4 viewL = referenceCamera.GetStereoViewMatrix(Camera.StereoscopicEye.Left);
            Matrix4x4 viewR = referenceCamera.GetStereoViewMatrix(Camera.StereoscopicEye.Right);

            // Calculate rotation matrices
            Matrix4x4 rotationLV = Matrix4x4.Rotate(Quaternion.AngleAxis(leftEyeRotation.y, transform.up));
            Matrix4x4 rotationLH = Matrix4x4.Rotate(Quaternion.AngleAxis(leftEyeRotation.x, transform.right));
            Matrix4x4 rotationRV = Matrix4x4.Rotate(Quaternion.AngleAxis(rightEyeRotation.y, transform.up));
            Matrix4x4 rotationRH = Matrix4x4.Rotate(Quaternion.AngleAxis(rightEyeRotation.x, transform.right));

            // Set view matrices to MainCamera
            Camera.main.SetStereoViewMatrix(Camera.StereoscopicEye.Left, rotationLH * rotationLV * viewL);
            Camera.main.SetStereoViewMatrix(Camera.StereoscopicEye.Right, rotationRH * rotationRV * viewR);
        }
    }

    public void SetCameraEyesRotation(Vector2 lRot, Vector2 rRot)
    {
        leftEyeRotation = lRot;
        rightEyeRotation = rRot;
    }
}