using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class DebugFadeToggle : MonoBehaviour
{
    public Image targetImage;
    public float duration = 0.5f;

    bool isVisible = true;
    Coroutine running;
    
    void Start()
    {
        var btn = GetComponent<Button>();
        if (btn != null)
            btn.onClick.AddListener(ToggleFade);
    }

    public void ToggleFade()
    {
        if (targetImage == null) return;

        float targetAlpha = isVisible ? 0f : 1f;
        if (running != null) StopCoroutine(running);
        running = StartCoroutine(FadeTo(targetAlpha));
        isVisible = !isVisible;
    }

    IEnumerator FadeTo(float targetAlpha)
    {
        float start = targetImage.color.a;
        float t = 0f;

        while (t < duration)
        {
            t += Time.deltaTime;
            float a = Mathf.Lerp(start, targetAlpha, Mathf.Clamp01(t / duration));
            var c = targetImage.color;
            c.a = a;
            targetImage.color = c;
            yield return null;
        }

        var final = targetImage.color;
        final.a = targetAlpha;
        targetImage.color = final;
        running = null;
    }
}