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

namespace ProceduralEditor
{
    // Runtime helper that toggles the alpha of a target Image when the Button it's attached to is clicked.
    public class DebugFadeToggleBridge : MonoBehaviour
    {
        public Image targetImage;
        public float duration = 0.1f;

        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;
        }
    }
}