using UnityEngine;

namespace RR.Game2D.Core
{
    public class Parallax : MonoBehaviour
    {
        [SerializeField][Range(-1f, 3f)] private float parallaxFactorX = 0.5f;
        [SerializeField][Range(-1f, 3f)] private float parallaxFactorY = 0.5f;
        [SerializeField] private bool lockYAxis = false;
        private Transform cameraTransform;
        private Vector3 previousCameraPosition;

        void Start()
        {
            if (Camera.main != null) cameraTransform = Camera.main.transform;
            previousCameraPosition = cameraTransform.position;
        }

        void FixedUpdate()
        {
            Vector3 delta = cameraTransform.position - previousCameraPosition;
            if (lockYAxis)
                transform.position += new Vector3(delta.x * parallaxFactorX, 0, 0);
            else
                transform.position += new Vector3(delta.x * parallaxFactorX, delta.y * parallaxFactorY, 0);
            previousCameraPosition = cameraTransform.position;
        }
    }
}