using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Reflection;

namespace dllsupport;

public class GifImage
{
	private Image gifImage;

	private FrameDimension dimension;

	private int frameCount;

	private int currentFrame = -1;

	private bool reverse;

	private int step = 1;

	public bool ReverseAtEnd
	{
		get
		{
			return reverse;
		}
		set
		{
			reverse = value;
		}
	}

	public GifImage(string path)
	{
		Stream manifestResourceStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(path);
		gifImage = Image.FromStream(manifestResourceStream);
		dimension = new FrameDimension(gifImage.FrameDimensionsList[0]);
		frameCount = gifImage.GetFrameCount(dimension);
	}

	public Image GetNextFrame()
	{
		currentFrame += step;
		if (currentFrame >= frameCount || currentFrame < 1)
		{
			if (reverse)
			{
				step *= -1;
				currentFrame += step;
			}
			else
			{
				currentFrame = 0;
			}
		}
		return GetFrame(currentFrame);
	}

	public Image GetFrame(int index)
	{
		gifImage.SelectActiveFrame(dimension, index);
		return (Image)gifImage.Clone();
	}
}