using System;
using System.Collections;
using UnityEngine;

public class UIFader : MonoBehaviour
{
	[SerializeField]
	private CanvasGroup _canvasGroup;

	[SerializeField]
	private float _duration = 0.5f;

	private float _timer;

	private Coroutine _coroutine;

	private Action _onComplete;

	public void FadeOut(Action onComplete = null)
	{
		if (_coroutine != null)
		{
			StopCoroutine(_coroutine);
		}
		_onComplete = onComplete;
		_timer = 0f;
		_canvasGroup.alpha = 0f;
		base.gameObject.SetActive(true);
		_coroutine = StartCoroutine(FadeOutCoroutine());
	}

	public void FadeIn(Action onComplete = null)
	{
		if (_coroutine != null)
		{
			StopCoroutine(_coroutine);
		}
		_onComplete = onComplete;
		_timer = 0f;
		_canvasGroup.alpha = 1f;
		base.gameObject.SetActive(true);
		_coroutine = StartCoroutine(FadeInCoroutine());
	}

	private IEnumerator FadeOutCoroutine()
	{
		float t = 0f;
		while (t < 1f)
		{
			t = _timer / _duration;
			_canvasGroup.alpha = t;
			_timer += Time.deltaTime;
			yield return null;
		}
		if (_onComplete != null)
		{
			_onComplete();
		}
		_onComplete = null;
	}

	private IEnumerator FadeInCoroutine()
	{
		float t = 0f;
		while (t < 1f)
		{
			t = _timer / _duration;
			_canvasGroup.alpha = 1f - t;
			_timer += Time.deltaTime;
			yield return null;
		}
		base.gameObject.SetActive(false);
		if (_onComplete != null)
		{
			_onComplete();
		}
		_onComplete = null;
	}
}