using System.Numerics;
using System.Text;
using Raylib_cs;

namespace DaggerFramework.Rendering
{
    public class RaylibRenderer : Renderer
    {
        public override Vector2 WindowSize => _windowSize;
        public override void DrawCircle(float radius, System.Drawing.Color color)
        {
            Raylib.DrawCircle((int)_position.X, (int)_position.Y, radius, SystemColorToRaylibColor(color));
        }

        public override void SetTransform(Vector2 position, float rotation)
        {
            _position = position;
            _rotation = rotation;
        }

        public override void CreateWindow(string title, Vector2 size)
        {
            Raylib.SetTraceLogLevel(TraceLogLevel.LOG_NONE);
            _windowSize = size;
            Raylib.InitWindow((int)_windowSize.X, (int)_windowSize.Y, title);
        }

        public override void SetWindowTitle(string title)
        {
            Raylib.SetWindowTitle(title);
        }

        public override void SetWindowVSync(bool value)
        {

        }

        public override void SetTargetFps(int fps)
        {
            Raylib.SetTargetFPS(fps);
        }

        public override bool WindowShouldClose()
        {
            return Raylib.WindowShouldClose();
        }

        public override void CloseWindow()
        {
            Raylib.CloseWindow();
        }

        public override void BeginFrame()
        {
            Raylib.BeginDrawing();
        }

        public override void EndFrame()
        {
            Raylib.EndDrawing();
        }

        public override void ClearBackground(System.Drawing.Color color)
        {
            Raylib.ClearBackground(SystemColorToRaylibColor(color));
        }

        public override double GetFrameTime()
        {
            return (double)Raylib.GetFrameTime();
        }

        private Raylib_cs.Color SystemColorToRaylibColor(System.Drawing.Color color)
        {
            return new Color { r = color.R, g = color.G, b = color.B, a = color.A };
        }

        public override int LoadTexture(Texture2d texture)
        {
            Image image;
            Texture2D rayTexture;
            string ext = "png";
            byte[] extBytes = Encoding.ASCII.GetBytes(ext);

            // TODO: This can cause memory leaks.
            unsafe
            {
                fixed (byte* textureData = texture.Data)
                {
                    fixed (byte* bExt = extBytes)
                    {
                        sbyte* sbExt = (sbyte*)*bExt;
                        image = Raylib.LoadImageFromMemory(sbExt, textureData, texture.Data.Length);
                    }
                }
            }
            rayTexture = Raylib.LoadTextureFromImage(image);
            Raylib.UnloadImage(image);

            _texturePool.Add(rayTexture);

            return _texturePool.Count - 1;
        }

        public override int LoadTexture(string path)
        {
            Image image = Raylib.LoadImage(path);
            var rayTexture = Raylib.LoadTextureFromImage(image);
            Raylib.UnloadImage(image);

            _texturePool.Add(rayTexture);
            return _texturePool.Count - 1;
        }

        public override void DrawTexture(int id, System.Drawing.Color tint)
        {
            Raylib.DrawTextureV(_texturePool[id], _position, SystemColorToRaylibColor(tint));
        }

        public override void DrawRectangle(Vector2 size, System.Drawing.Color color)
        {
            // Raylib.DrawRectangleV(_position, size, SystemColorToRaylibColor(color));
            Raylib.DrawRectanglePro(new Rectangle()
            {
                x = _position.X,
                y = _position.Y,
                width = size.X,
                height = size.Y
            }, Vector2.Zero, _rotation, SystemColorToRaylibColor(color));
        }

        public override void DrawDebugText(Vector2 position, string text, int fontSize, System.Drawing.Color color)
        {
            Raylib.DrawText(text, (int)position.X, (int)position.Y, fontSize, SystemColorToRaylibColor(color));
        }

        public override void Initialize(RendererSettings settings)
        {
            ConfigFlags flags = 0;

            // MSAA
            flags |= settings.Msaa == Msaa.Msaa4x ? ConfigFlags.FLAG_MSAA_4X_HINT : 0;

            // VSync
            flags |= settings.UseVSync ? ConfigFlags.FLAG_VSYNC_HINT : 0;

            // Fullscreen
            flags |= settings.Fullscreen ? ConfigFlags.FLAG_FULLSCREEN_MODE : 0;
            Raylib.SetConfigFlags(flags);
        }

        // TODO
        public override void SetTransform(Matrix4x4 transform) { }

        private List<Texture2D> _texturePool = new List<Texture2D>();
        private Vector2 _position;
        private float _rotation;
        private Vector2 _windowSize;
    }
}