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

public abstract class AbstractMap {
    private IDrawingObject _drawningObject = null;
    protected int[][] _map = null;
    protected int _width;
    protected int _height;
    protected float _size_x;
    protected float _size_y;
    protected final Random _random = new Random();
    protected final int _freeRoad = 0;
    protected final int _barrier = 1;

    protected abstract void GenerateMap();
    protected abstract void DrawRoadPart(Graphics g, int i, int j);
    protected abstract void DrawBarrierPart(Graphics g, int i, int j);

    public BufferedImage CreateMap(int width, int height, IDrawingObject drawningObject)
    {
        _width = width;
        _height = height;
        _drawningObject = drawningObject;
        GenerateMap(); // abstract void
        while (!SetObjectOnMap())
        {
            GenerateMap();
        }
        return DrawMapWithObject();
    }

    public BufferedImage MoveObject(Direction direction)
    {
        boolean isFree = true;

        int startPosX = (int)(_drawningObject.GetCurrentPosition()[3] / _size_x);
        int startPosY = (int)(_drawningObject.GetCurrentPosition()[0] / _size_y);

        int objectWidth = (int)(_drawningObject.GetCurrentPosition()[1] / _size_x);
        int objectHeight = (int)(_drawningObject.GetCurrentPosition()[2] / _size_y);

        switch (direction)
        {
            case Right:
                for (int i = objectWidth; i <= objectWidth + (int)(_drawningObject.getStep() / _size_x); i++)
                {
                    for (int j = startPosY; j <= objectHeight; j++)
                    {
                        if (_map[i][j] == _barrier)
                        {
                            isFree = false;
                            break;
                        }
                    }
                }
                break;

            case Left:
                for (int i = startPosX; i >= (int)(_drawningObject.getStep() / _size_x); i--)
                {
                    for (int j = startPosY; j <= objectHeight; j++)
                    {
                        if (_map[i][j] == _barrier)
                        {
                            isFree = false;
                            break;
                        }
                    }
                }
                break;

            case Up:
                for (int i = startPosX; i <= objectWidth; i++)
                {
                    for (int j = startPosY; j >= (int)(_drawningObject.getStep() / _size_y); j--)
                    {
                        if (_map[i][j] == _barrier)
                        {
                            isFree = false;
                            break;
                        }
                    }
                }
                break;

            case Down:
                for (int i = startPosX; i <= objectWidth; i++)
                {
                    for (int j = objectHeight; j <= objectHeight + (int)(_drawningObject.getStep() / _size_y); j++)
                    {
                        if (_map[i][j] == _barrier)
                        {
                            isFree = false;
                            break;
                        }
                    }
                }
                break;
        }
        if (isFree)
        {
            _drawningObject.MoveObject(direction);
        }
        return DrawMapWithObject();
    }

    private boolean SetObjectOnMap()
    {
        if (_drawningObject == null || _map == null)
        {
            return false;
        }
        int x = _random.nextInt( 10);
        int y = _random.nextInt( 10);
        _drawningObject.SetObject(x, y, _width, _height);

        for (int i = 0; i < _map.length; ++i)
        {
            for (int j = 0; j < _map[0].length; ++j)
            {
                if (i * _size_x >= x && j * _size_y >= y &&
                        i * _size_x <= x + _drawningObject.GetCurrentPosition()[1] &&
                        j * _size_y <= j + _drawningObject.GetCurrentPosition()[2])
                {
                    if (_map[i][j] == _barrier)
                    {
                        return false;
                    }
                }
            }
        }

        return true;
    }

    private BufferedImage DrawMapWithObject()
    {
        BufferedImage bmp = new BufferedImage(_width, _height, BufferedImage.TYPE_INT_RGB);
        if (_drawningObject == null || _map == null)
        {
            return bmp;
        }
        Graphics gr = bmp.getGraphics();
        for (int i = 0; i < _map.length; ++i)
        {
            for (int j = 0; j < _map[0].length; ++j)
            {
                if (_map[i][j] == _freeRoad)
                {
                    DrawRoadPart(gr, i, j);
                }
                else if (_map[i][j] == _barrier)
                {
                    DrawBarrierPart(gr, i, j);
                }
            }
        }
        _drawningObject.DrawingObject(gr);
        return bmp;
    }
}