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

public class UIImageFader : MonoBehaviour
{
    [SerializeField] private Image targetImage;

    [Header("Fade Settings")]
    public float fadeInDuration = 1f;
    public float fadeOutDuration = 1f;
    public float fadeOutDelay = 0f;

    private bool isFading = false;

    private void Awake()
    {
        if (targetImage == null)
        {
            targetImage = GetComponent<Image>();
        }

        // Set initial alpha to 0 (completely transparent)
        SetAlpha(0f);
    }

    // Method to start the fade process
    public void StartFade()
    {
        if (!isFading && gameObject.activeInHierarchy && enabled)
        {
            StartCoroutine(FadeRoutine());
        }
    }

    private IEnumerator FadeRoutine()
    {
        isFading = true;

        // Start Fade In
        yield return StartCoroutine(Fade(0f, 1f, fadeInDuration));

        // Optional delay before fade out
        yield return new WaitForSeconds(fadeOutDelay);

        // Start Fade Out
        yield return StartCoroutine(Fade(1f, 0f, fadeOutDuration));

        isFading = false;
    }

    private IEnumerator Fade(float startAlpha, float endAlpha, float duration)
    {
        float elapsedTime = 0f;
        Color color = targetImage.color;

        while (elapsedTime < duration)
        {
            elapsedTime += Time.deltaTime;
            float alpha = Mathf.Lerp(startAlpha, endAlpha, elapsedTime / duration);
            SetAlpha(alpha);
            yield return null;
        }

        // Ensure the final alpha is set
        SetAlpha(endAlpha);
    }

    // Method to set alpha of the image
    private void SetAlpha(float alpha)
    {
        if (targetImage != null)
        {
            Color color = targetImage.color;
            color.a = alpha;
            targetImage.color = color;
        }
    }
}