using OpenTK.Graphics.OpenGL4;
using StbImageSharp;

namespace VoxelEngine.Rendering;

public sealed class Texture : IDisposable
{
    private readonly int _handle;

    public int Width { get; }
    public int Height { get; }

    public Texture(string path)
    {
        this._handle = GL.GenTexture();
        GL.BindTexture(TextureTarget.Texture2D, this._handle);

        StbImage.stbi_set_flip_vertically_on_load(1);
        using FileStream stream = File.OpenRead(path);
        ImageResult image = ImageResult.FromStream(stream, ColorComponents.RedGreenBlueAlpha);
        this.Width = image.Width;
        this.Height = image.Height;

        GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba,
            image.Width, image.Height, 0, PixelFormat.Rgba, PixelType.UnsignedByte, image.Data);

        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
    }

    public void Use(TextureUnit unit = TextureUnit.Texture0)
    {
        GL.ActiveTexture(unit);
        GL.BindTexture(TextureTarget.Texture2D, this._handle);
    }

    public void Dispose() => GL.DeleteTexture(this._handle);
}