using UnityEngine;
using UnityEngine.UI;

public class PoisonScreenOverlay : MonoBehaviour
{
    [SerializeField] private Image overlayImage;
    [SerializeField] private float fadeSpeed = 2f;
    
    private float targetAlpha = 0f;
    private float currentAlpha = 0f;

    void Start()
    {
        if (overlayImage == null)
        {
            overlayImage = GetComponent<Image>();
        }

        if (overlayImage != null)
        {
            Color c = overlayImage.color;
            c.a = 0f;
            overlayImage.color = c;
            overlayImage.enabled = false;
        }
    }

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

        if (Mathf.Abs(currentAlpha - targetAlpha) > 0.01f)
        {
            currentAlpha = Mathf.MoveTowards(currentAlpha, targetAlpha, fadeSpeed * Time.deltaTime);
            Color c = overlayImage.color;
            c.a = currentAlpha;
            overlayImage.color = c;

            overlayImage.enabled = currentAlpha > 0.01f;
        }
    }

    public void SetOverlayActive(bool active)
    {
        targetAlpha = active ? 0.6f : 0f; // maximum 60% opacity green overlay
    }
}