import java.awt.*;
import java.awt.image.BufferedImage;

public class CarsGenericCollection <T extends DrawTanker, U extends IMoveableObject> {
    private final int _pictureWidth;
    private final int _pictureHeight;
    private final int _placeSizeWidth = 110;
    private final int _placeSizeHeight = 80;
    private final SetGeneric<T> _collection;
    public CarsGenericCollection(int picWidth, int picHeight)
    {
        int width = picWidth / _placeSizeWidth;
        int height = picHeight / _placeSizeHeight;
        _pictureWidth = picWidth;
        _pictureHeight = picHeight;
        _collection = new SetGeneric<T>(width * height);
    }

    public int plus(T gasTanker)
    {
        return _collection.Insert(gasTanker);
    }

    public T minus(int position)
    {
        return _collection.Remove(position);
    }

    public U GetU(int pos)
    {
        return (U)_collection.Get(pos).GetMoveableObject();
    }
    public Image ShowCars()
    {
        BufferedImage bmp = new BufferedImage(_pictureWidth, _pictureHeight, BufferedImage.TYPE_INT_ARGB);
        Graphics g = bmp.getGraphics();
        DrawBackground(g);
        DrawObjects(g);
        return bmp;
    }

    private void DrawBackground(Graphics g)
    {
        g.setColor(Color.BLACK);
        for (int i = 0; i < _pictureWidth / _placeSizeWidth; i++)
        {
            for (int j = 0; j < _pictureHeight/_placeSizeHeight + 1; j++)
            {
                g.drawLine(i * _placeSizeWidth, j * _placeSizeHeight, i * _placeSizeWidth + _placeSizeWidth / 2, j * _placeSizeHeight);
                g.drawLine(i * _placeSizeWidth, 0, i * _placeSizeWidth, _pictureHeight / _placeSizeHeight * _placeSizeHeight);
            }
        }
    }

    private void DrawObjects(Graphics g) {
        int width = _pictureWidth / _placeSizeWidth;
        int height = _pictureHeight / _placeSizeHeight;
        for (int i = 0; i < _collection.Count(); i++) {
            DrawTanker tank = _collection.Get(i);
            if (tank == null)
                continue;
            tank.SetPosition(i % width * _placeSizeWidth, (height - i / height - 1) * _placeSizeHeight);
            tank.DrawTransport(g);
        }
    }

}