using System;
using System.Windows.Forms;
using System.Drawing;
using SdlDotNet.Graphics;
using SdlDotNet.Input;
using SdlDotNet.Graphics.Primitives;
using SdlDotNet.Core;
using System.Collections.Generic;
using System.IO;

namespace Shmup
{

    public abstract class Entity
    {
        public static Random rnd = new Random();

        public float x;
        public float y;
        public int sprite;
        public int rotation;

        public Entity(float X, float Y, int Sprite, int Rotation)
        {
            x = X;
            y = Y;
            sprite = Sprite;
            rotation = Rotation;
        }

        public void draw(Surface sprites, SpriteSheet ss, Surface video)
        {
            Surface temp1 = sprites.CreateSurfaceFromClipRectangle(ss.getRectangle(sprite));
            Surface temp2 = temp1.CreateRotatedSurface(rotation, false);
            Surface temp3 = temp2.Convert(video, false, false);
            temp3.SourceColorKey = temp3.GetPixel(new Point(0, 0));
            video.Blit(temp3, new Point((int)(x - (temp3.Width / 2)), (int)(y - (temp3.Height / 2))));
            temp3.Dispose();
            temp2.Dispose();
            temp1.Dispose();
        }

        public abstract void move();
    }

    // -- Stars --

    public class stars: Entity
    {

        public stars(int X, int Y, int Sprite, int Rotation) : base(X, Y, Sprite, Rotation) {}

        public override void move() { }
    }

    // -- Ships --

    public class Ship : Entity
    {
        private int direction;
        private float acceleration;
        private float velocity;
        private int maxvelocity;

        // constructors

        public Ship(float X, float Y, int Sprite, int Rotation, int Direction, float Velocity, float Acceleration, int Maxvelocity) : base(X, Y, Sprite, Rotation)
        {
            direction = Direction;
            velocity = Velocity;
            acceleration = Acceleration;
            maxvelocity = Maxvelocity;
        }
        // behaviour

        public override void move()
        {
            if (Keyboard.IsKeyPressed(Key.UpArrow)) { thrust(); }
            if (Keyboard.IsKeyPressed(Key.RightArrow)) { rotation -= 4; }
            if (Keyboard.IsKeyPressed(Key.DownArrow)) { minusthrust(); }
            if (Keyboard.IsKeyPressed(Key.LeftArrow)) { rotation += 4; }

            double rad = (double)(rotation + 90) * Math.PI / 180.0;
            double dx = (velocity * Math.Cos(rad));
            double dy = -(velocity * Math.Sin(rad));

            x += (float)(dx);
            y += (float)(dy);


        }

        public void thrust()
        {
            velocity += acceleration;
            if (velocity > maxvelocity) { velocity = maxvelocity; }
        }

        public void minusthrust()
        {
            velocity -= acceleration;
            if (velocity < 0) { velocity = 0; }
        }
    }

    // -- Asteroid --

    public class Asteroid : Entity
    {

        // state

        public float dx;
        public float dy;
        public int direction;
        public int dr;

        // constructors

        public Asteroid(float X, float Y, int Sprite, int Rotation, int Direction, float Dx, float Dy, int Dr) : base(X, Y, Sprite, Rotation)
        {
            dx = Dx / 2f;
            dy = Dy / 2f;
            direction = Direction;
            dr = Dr;

        }
        public override void move()
        {
            {
                rotation += dr;
                x += dx;
                y += dy;

                if (rotation != 0)
                {
                    direction = (direction + rotation) % 360;
                }


                if (x < 0)
                {
                    x = Program.FRAME_WIDTH;
                }
                else if (x > Program.FRAME_WIDTH)
                {
                    x = 0;
                }

                if (y < 0)
                {
                    y = Program.FRAME_HEIGHT;
                }
                else if (y > Program.FRAME_HEIGHT)
                {
                    y = 0;
                }
            }
        }
    }
}