using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Image))]
public class UIAnimationFree : MonoBehaviour
{
    private Image _image;
    private int _index;
    private float _nextTime;
    public int frameRate = 20;
    public bool loop = false;
    public Sprite[] sprites;

    private void Awake()
    {
        _image = GetComponent<Image>();
    }
    
    private void Update()
    {
        if (Time.time > _nextTime)
        {
            _index++;
            if (_index >= sprites.Length)
            {
                if (loop)
                {
                    _index = 0;
                    SetImage();
                    _nextTime += GetFrameTime();
                }
                else
                {
                    if (_waitTime == -1)
                    {
                        _nextTime = float.PositiveInfinity;
                        StopAnimation();
                    }
                    else
                    {
                        _index = 0;
                        SetImage();
                        _nextTime = Time.time + _waitTime;
                    }
                }
            }
            else
            {
                SetImage();
                _nextTime += GetFrameTime();
            }
        }
    }

    private float GetFrameTime()
    {
        return 1f / Mathf.Max(1, frameRate);
    }

    private void SetImage()
    {
        if (_index < sprites.Length)
            _image.sprite = sprites[_index];
    }

    private float _waitTime = -1;
    public void ShowAnimationAfterTime(float time)
    {
        gameObject.SetActive(true);
        _waitTime = time;
    }

    public void StopAnimation()
    {
        _index = 0;
        _waitTime = -1;
        if (gameObject.activeInHierarchy)
            gameObject.SetActive(false);
    }
}