using System.Drawing;
using System.Numerics;
using System.Text;
// using Veldrid;
// using Veldrid.Sdl2;
// using Veldrid.SPIRV;
// using Veldrid.StartupUtilities;

namespace DaggerFramework.Rendering
{
    // public class StandardRenderer : Renderer
    // {
    //     public override void BeginFrame()
    //     {
    //         _commandList.Begin();
    //         _commandList.SetFramebuffer(_graphicsDevice.SwapchainFramebuffer);
    //     }

    //     public override void ClearBackground(Color color)
    //     {
    //         _commandList.ClearColorTarget(0, SystemColorToRgbaFloat(color));
    //     }

    //     public override void CloseWindow()
    //     {
    //         _window.Close();
    //     }

    //     public override void CreateWindow(string title, Vector2 size)
    //     {
    //         var windowCreateInfo = new WindowCreateInfo()
    //         {
    //             // TODO: add position property to CreateWindow.
    //             X = (int)size.X / 2,
    //             Y = (int)size.Y / 2,
    //             WindowWidth = (int)size.X,
    //             WindowHeight = (int)size.Y,
    //             WindowTitle = title,

    //         };

    //         _window = VeldridStartup.CreateWindow(ref windowCreateInfo);
    //     }

    //     public override void DrawCircle(float radius, Color color)
    //     {
    //         throw new NotImplementedException();
    //     }

    //     public override void DrawDebugText(Vector2 position, string text, int fontSize, Color color)
    //     {
    //         throw new NotImplementedException();
    //     }

    //     public override void DrawRectangle(Vector2 size, Color color)
    //     {
    //         _commandList.SetVertexBuffer(0, _vertexBuffer);
    //         _commandList.SetIndexBuffer(_indexBuffer, IndexFormat.UInt16);
    //         _commandList.SetPipeline(_graphicsPipeline);
    //         _commandList.SetGraphicsResourceSet(0, _resourceSet);
    //         _graphicsDevice.UpdateBuffer(_uniformBuffer, 0, SystemColorToRgbaFloat(color));
    //         _commandList.DrawIndexed(indexCount: 4, instanceCount: 1, 0, 0, 0);
    //     }

    //     public override void DrawTexture(int id, Color tint)
    //     {
    //         throw new NotImplementedException();
    //     }

    //     public override void EndFrame()
    //     {
    //         _commandList.End();
    //         _graphicsDevice.SubmitCommands(_commandList);
    //         _graphicsDevice.SwapBuffers();
    //     }

    //     public override double GetFrameTime()
    //     {
    //         return 0.16f;
    //     }

    //     private void CreateResources()
    //     {
    //         _resourceFactory = _graphicsDevice.ResourceFactory;
    //         _commandList = _resourceFactory.CreateCommandList();

    //         _vertexBuffer = _resourceFactory.CreateBuffer(new BufferDescription(4 * 8, BufferUsage.VertexBuffer));
    //         _indexBuffer = _resourceFactory.CreateBuffer(new BufferDescription(4 * sizeof(ushort), BufferUsage.IndexBuffer));
    //         _uniformBuffer = _resourceFactory.CreateBuffer(new BufferDescription(4 * sizeof(float), BufferUsage.UniformBuffer));


    //         FillBuffers();
    //         var vertexDesc = new ShaderDescription(ShaderStages.Vertex, Encoding.UTF8.GetBytes(_colorRectShader.VertexSource), "main");
    //         var fragmentDesc = new ShaderDescription(ShaderStages.Fragment, Encoding.UTF8.GetBytes(_colorRectShader.FragmentSource), "main");
    //         _shaders = _resourceFactory.CreateFromSpirv(vertexDesc, fragmentDesc);
    //         CreatePipeline();
    //     }

    //     private void CreatePipeline()
    //     {
    //         VertexLayoutDescription vertexLayout = new VertexLayoutDescription(
    // new VertexElementDescription("Position", VertexElementSemantic.Position, VertexElementFormat.Float2));

    //         var pipelineDesc = new GraphicsPipelineDescription();
    //         pipelineDesc.BlendState = BlendStateDescription.SingleOverrideBlend;

    //         pipelineDesc.RasterizerState = new RasterizerStateDescription(
    //             cullMode: FaceCullMode.Back,
    //             fillMode: PolygonFillMode.Solid,
    //             frontFace: FrontFace.Clockwise,
    //             depthClipEnabled: true,
    //             scissorTestEnabled: false);

    //         pipelineDesc.PrimitiveTopology = PrimitiveTopology.TriangleStrip;

    //         var layout = _resourceFactory.CreateResourceLayout(new ResourceLayoutDescription(
    //             new ResourceLayoutElementDescription("color", ResourceKind.UniformBuffer, ShaderStages.Fragment)
    //         ));

    //         _resourceSet = _resourceFactory.CreateResourceSet(new ResourceSetDescription(layout, _uniformBuffer));

    //         pipelineDesc.ResourceLayouts = new ResourceLayout[] { layout };

    //         pipelineDesc.ShaderSet = new ShaderSetDescription(vertexLayouts: new VertexLayoutDescription[] { vertexLayout }, _shaders);

    //         pipelineDesc.Outputs = _graphicsDevice.SwapchainFramebuffer.OutputDescription;

    //         _graphicsPipeline = _resourceFactory.CreateGraphicsPipeline(pipelineDesc);
    //     }

    //     private void FillBuffers()
    //     {
    //         _graphicsDevice.UpdateBuffer(_vertexBuffer, 0, _quadVertices);
    //         _graphicsDevice.UpdateBuffer(_indexBuffer, 0, _quadIndices);
    //     }
    //     public override void Initialize(RendererSettings settings)
    //     {
    //         _settings = settings;
    //         _graphicsDevice = VeldridStartup.CreateGraphicsDevice(_window, new GraphicsDeviceOptions
    //         {
    //             PreferStandardClipSpaceYDirection = true,
    //             PreferDepthRangeZeroToOne = true
    //         });

    //         CreateResources();
    //     }

    //     public override int LoadTexture(Texture2d texture)
    //     {
    //         throw new NotImplementedException();
    //     }

    //     public override int LoadTexture(string path)
    //     {
    //         // throw new NotImplementedException();

    //         return -1;
    //     }

    //     public override void SetTargetFps(int fps)
    //     {
    //         _window.PollIntervalInMs = 1 / fps;
    //     }

    //     public override void SetTransform(Vector2 position)
    //     {
    //         // throw new NotImplementedException();
    //     }

    //     public override void SetWindowTitle(string title)
    //     {
    //         throw new NotImplementedException();
    //     }

    //     public override void SetWindowVSync(bool value)
    //     {
    //         throw new NotImplementedException();
    //     }

    //     public override bool WindowShouldClose()
    //     {
    //         _window.PumpEvents();
    //         return !_window.Exists;
    //     }

    //     private RgbaFloat SystemColorToRgbaFloat(System.Drawing.Color color)
    //     {
    //         return new RgbaFloat(color.R, color.G, color.B, color.A);
    //     }

    //     public override void SetTransform(Matrix4x4 transform)
    //     {
    //         _transform = transform;
    //     }

    //     // Transform
    //     private Matrix4x4 _transform;

    //     // TEMP: quad stuff. 
    //     private readonly Vector2[] _quadVertices =
    //     {
    //         new Vector2(-0.5f, 0.5f),
    //         new Vector2(0.5f, 0.5f),
    //         new Vector2(-0.5f, -0.5f),
    //         new Vector2(0.5f, -0.5f)
    //     };

    //     private readonly ushort[] _quadIndices = { 0, 1, 2, 3 };
    //     private ColorRectShader _colorRectShader = new ColorRectShader();

    //     private Sdl2Window _window;
    //     private RendererSettings _settings;
    //     private GraphicsDevice _graphicsDevice;

    //     // Resources
    //     private ResourceFactory _resourceFactory;
    //     private CommandList _commandList;
    //     private Pipeline _graphicsPipeline;
    //     private Veldrid.Shader[] _shaders;

    //     // Quad resources
    //     private DeviceBuffer _vertexBuffer;
    //     private DeviceBuffer _indexBuffer;
    //     private DeviceBuffer _uniformBuffer;
    //     private ResourceSet _resourceSet;
    // }
}