using SFML.System;
using SFML.Window;
using SFML.Graphics;
namespace sfml_dummy
{
    internal class Program
    {
        private static Image[] images = new Image[6];
        private static int delta_frames = 0;
        private static int current_image;
        private static RenderWindow rw;
        static void Main(string[] args)
        {
            rw = new RenderWindow(new VideoMode(800, 600), "SFML Loading Screen");
            images[0] = new Image("1.png");
            images[1] = new Image("2.png");
            images[2] = new Image("3.png");
            images[3] = new Image("4.png");
            images[4] = new Image("5.png");
            images[5] = new Image("6.png");
            rw.Closed += (e, a) => rw.Close();
            rw.SetFramerateLimit(60);
            rw.Resized += Rw_Resized;
            while (rw.IsOpen)
            {
                delta_frames++;
                if (delta_frames == 60) delta_frames = 0;
                if (delta_frames == 0) current_image = new Random().Next(5);
                rw.DispatchEvents();
                rw.Clear();
                //rw.Draw(new Sprite(new Texture(images[current_image])));
                rw.Draw(new RectangleShape(new Vector2f(100, 100)) { Position = new Vector2f(800/2-50, 600/2-50)});
                rw.Display();
            }
        }

        private static void Rw_Resized(object o, SizeEventArgs a)
        {
            View v = rw.GetView();
            rw.SetView(GetLetterboxView(v, 800, 600));
        }

        public static View GetLetterboxView(View view, int windowWidth, int windowHeight)
                {
                    // Compares the aspect ratio of the window to the aspect ratio of the view,
                    // and sets the view's viewport accordingly in order to achieve a letterbox effect.
                    // A new view (with a new viewport set) is returned.

                    float windowRatio = (float)windowWidth / windowHeight;
                    float viewRatio = view.Size.X / view.Size.Y;
                    float sizeX = 1;
                    float sizeY = 1;
                    float posX = 0;
                    float posY = 0;

                    bool horizontalSpacing = true;
                    if (windowRatio < viewRatio)
                        horizontalSpacing = false;

                    // If horizontalSpacing is true, the black bars will appear on the left and right side.
                    // Otherwise, the black bars will appear on the top and bottom.

                    if (horizontalSpacing)
                    {
                        sizeX = viewRatio / windowRatio;
                        posX = (1 - sizeX) / 2f;
                    }
                    else
                    {
                        sizeY = windowRatio / viewRatio;
                        posY = (1 - sizeY) / 2f;
                    }

                    view.Viewport = new FloatRect(posX, posY, sizeX, sizeY);

                    return view;
                }
    }
}