using OpenTK.Graphics.OpenGL4;
using StbImageSharp;

namespace Voxel
{
    public class Texture
    {
        private int _handle;
        private string _path;

        public Texture(string path)
        {
            _handle = GL.GenTexture();
            _path = path;

            LoadFromFile();
        }

        private void LoadFromFile()
        {
            StbImage.stbi_set_flip_vertically_on_load(1);
            ImageResult image = ImageResult.FromStream(File.OpenRead(_path), ColorComponents.RedGreenBlueAlpha);

            GL.BindTexture(TextureTarget.Texture2D, _handle);
            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.Repeat);
            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
        }

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