using UnityEngine;

public class CameraBob : MonoBehaviour
{
    public float bobSpeed = 10f;
    public float bobAmount = 0.05f;

    private float timer;
    private Vector3 startPos;

    public CharacterController controller;

    void Start()
    {
        startPos = transform.localPosition;
    }

    void Update()
    {
        if (controller == null) return;

        if (controller.velocity.magnitude > 0.1f && controller.isGrounded)
        {
            timer += Time.deltaTime * bobSpeed;

            float bobY = Mathf.Sin(timer) * bobAmount;

            transform.localPosition = startPos + new Vector3(0, bobY, 0);
        }
        else
        {
            timer = 0f;

            // smoothly reset
            transform.localPosition = Vector3.Lerp(
                transform.localPosition,
                startPos,
                Time.deltaTime * 5f
            );
        }
    }
}