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

public class NotificationUI : MonoBehaviour
{
    public Text messageText;
    public CanvasGroup canvasGroup;
    public float visibleDuration = 2.2f;
    public float fadeDuration = 0.25f;

    private Coroutine routine;

    private void Awake()
    {
        if (canvasGroup == null)
        {
            canvasGroup = GetComponent<CanvasGroup>();
        }

        if (canvasGroup != null)
        {
            canvasGroup.alpha = 0f;
            canvasGroup.blocksRaycasts = false;
        }
    }

    public void Show(string message)
    {
        if (messageText == null || string.IsNullOrWhiteSpace(message))
        {
            return;
        }

        messageText.text = message;

        if (routine != null)
        {
            StopCoroutine(routine);
        }

        routine = StartCoroutine(ShowRoutine());
    }

    private IEnumerator ShowRoutine()
    {
        if (canvasGroup == null)
        {
            yield break;
        }

        canvasGroup.alpha = 1f;
        yield return new WaitForSeconds(Mathf.Max(0.1f, visibleDuration));

        float elapsed = 0f;
        float duration = Mathf.Max(0.05f, fadeDuration);
        while (elapsed < duration)
        {
            elapsed += Time.deltaTime;
            canvasGroup.alpha = Mathf.Lerp(1f, 0f, elapsed / duration);
            yield return null;
        }

        canvasGroup.alpha = 0f;
        routine = null;
    }
}