using Silk.NET.OpenGL;
using System;

namespace FModel.Views.Snooper;

public class Texture : IDisposable
{
    private uint _handle;
    private GL _gl;

    public unsafe Texture(GL gl, Span<byte> data, uint width, uint height)
    {
        _gl = gl;

        _handle = _gl.GenTexture();
        Bind();

        fixed (void* d = &data[0])
        {
            _gl.TexImage2D(TextureTarget.Texture2D, 0, (int) InternalFormat.Rgba, width, height, 0, PixelFormat.Rgba, PixelType.UnsignedByte, d);
            SetParameters();
        }
    }

    private void SetParameters()
    {
        _gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int) GLEnum.ClampToEdge);
        _gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int) GLEnum.ClampToEdge);
        _gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int) GLEnum.LinearMipmapLinear);
        _gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int) GLEnum.Linear);
        _gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureBaseLevel, 0);
        _gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMaxLevel, 8);
        _gl.GenerateMipmap(TextureTarget.Texture2D);
    }

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

    public void Dispose()
    {
        _gl.DeleteTexture(_handle);
    }
}