using UnityEngine;

public class CameraShake : MonoBehaviour
{
    public static CameraShake Instance { get; private set; }

    private float shakeDuration = 0f;
    private float shakeIntensity = 0f;
    private float shakeFalloff = 1f;

    private Vector3 originalLocalPos;
    private bool shaking = false;

    void Awake()
    {
        Instance = this;
        originalLocalPos = transform.localPosition;
    }

    void LateUpdate()
    {
        if (!shaking) return;

        if (shakeDuration > 0f)
        {
            Vector3 offset = Random.insideUnitSphere * shakeIntensity;
            offset.z = 0f; // Keep shake on X/Y only
            transform.localPosition = originalLocalPos + offset;

            shakeDuration -= Time.deltaTime;
            shakeIntensity = Mathf.Lerp(shakeIntensity, 0f, Time.deltaTime * shakeFalloff);
        }
        else
        {
            shaking = false;
            shakeDuration = 0f;
            transform.localPosition = originalLocalPos;
        }
    }

    /// <summary>
    /// Trigger a camera shake.
    /// </summary>
    /// <param name="duration">How long to shake (seconds)</param>
    /// <param name="intensity">How far to displace the camera</param>
    public void Shake(float duration, float intensity)
    {
        shakeDuration = duration;
        shakeIntensity = intensity;
        shakeFalloff = intensity / duration;
        shaking = true;
    }
}