using UnityEngine;
using UnityEngine.UI;

public class ImageSequence : MonoBehaviour
{
    [Header("Sprites")]
    public Sprite[] frames = new Sprite[9];

    [Header("Přehrávání")]
    public float fps = 12f;
    public bool loop = true;

    [Header("Tlačítko")]
    public Button playButton;

    private Image _image;
    private int _currentFrame = 0;
    private float _timer = 0f;
    private bool _playing = false;

    void Awake()
    {
        _image = GetComponent<Image>();
    }

    void Start()
    {
        if (frames.Length == 0 || _image == null) return;
        ShowFrame(0);

        if (playButton != null)
            playButton.onClick.AddListener(TogglePlay);
    }

    void Update()
    {
        if (!_playing || frames.Length == 0) return;

        _timer += Time.deltaTime;

        if (_timer >= 1f / fps)
        {
            _timer = 0f;
            NextFrame();
        }
    }

    void NextFrame()
    {
        _currentFrame++;

        if (_currentFrame >= frames.Length)
        {
            if (loop)
                _currentFrame = 0;
            else
            {
                _currentFrame = frames.Length - 1;
                Stop();
                return;
            }
        }

        ShowFrame(_currentFrame);
    }

    void ShowFrame(int index)
    {
        if (index < 0 || index >= frames.Length) return;
        if (frames[index] != null)
            _image.sprite = frames[index];
    }

    public void Play()
    {
        _playing = true;
    }

    public void Pause()
    {
        _playing = false;
    }

    public void Stop()
    {
        _playing = false;
        _currentFrame = 0;
        ShowFrame(0);
    }

    public void TogglePlay()
    {
        if (_playing)
            Pause();
        else
            Play();
    }

    public void GoToFrame(int index)
    {
        _currentFrame = Mathf.Clamp(index, 0, frames.Length - 1);
        ShowFrame(_currentFrame);
    }
}