using UnityEngine;

namespace BulletHellTemplate
{
    /// <summary>
    /// Makes a canvas always face the main camera, respecting all rotations to prevent visual jitter.
    /// Designed for top-down games with world-space canvases.
    /// </summary>
    public class LookAtCamera : MonoBehaviour
    {
        private Transform mainCameraTransform; // Cache the transform of the main camera for efficiency

        void Start()
        {
            // Cache the main camera transform
            if (Camera.main != null)
            {
                mainCameraTransform = Camera.main.transform;
            }
        }

        void LateUpdate()
        {
            if (mainCameraTransform != null)
            {
                // Calculate the direction vector from the canvas to the camera
                Vector3 directionToCamera = mainCameraTransform.position - transform.position;

                // Create a rotation that points the canvas directly at the camera
                Quaternion targetRotation = Quaternion.LookRotation(directionToCamera, Vector3.up);

                // Apply the rotation to the canvas
                transform.rotation = targetRotation;
            }
        }
    }
}