using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SFML.Graphics;
using SFML.Window;

namespace ComponentEngine
{
    class Program
    {
        static RenderWindow window;
        static Sprite sp;
        static Vector2i currentMousePos;
        static float speed;

        static void Main(string[] args)
        {
            INIParser iniparser = new INIParser();
            Dictionary<String, int> VideoSettings = iniparser.ParseINI();
            window = new RenderWindow(new VideoMode((uint)VideoSettings["width"], (uint)VideoSettings["height"], 32), "Component Engine");

            sp = new Sprite(new Texture("car.png"));

            Vector2f pos = new Vector2f();
            pos.X = window.Size.X / 2;
            pos.Y = window.Size.Y / 2;
            sp.Position = pos;
            sp.Origin = new Vector2f(sp.Texture.Size.X / 2, 0);
            currentMousePos = new Vector2i((int)window.Size.X / 2, (int)window.Size.Y / 2);
            speed = 1.0f;
            while (window.IsOpen())
            {
                if (Keyboard.IsKeyPressed(Keyboard.Key.Escape))
                    window.Close();
                currentMousePos = window.InternalGetMousePosition();
                window.DispatchEvents();
                window.Clear();
                MoveSprite(currentMousePos);
                window.Draw(sp);
                window.Display();
            }
        }

        private static void MoveSprite(Vector2i mousepos)
        {
            Vector2f targetV = new Vector2f(mousepos.X, mousepos.Y);
            Vector2f directionV = Normalize(targetV - sp.Position);
            float newRot = (float)Math.Atan2(directionV.Y, directionV.X) * 180 / (float)Math.PI + 90;
            if (sp.Rotation != newRot)
            {
                sp.Rotation = newRot;
            }
            Console.WriteLine((mousepos.X - sp.Position.X) + "," + (mousepos.Y - sp.Position.Y));
            sp.Position += directionV * speed;
        }

        private static Vector2f Normalize(Vector2f v1)
        {
            float length = (float)Math.Sqrt((v1.X * v1.X) + (v1.Y * v1.Y));
            float x = v1.X / length;
            float y = v1.Y / length;
            return new Vector2f(x, y);
        }
    }
}