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

public abstract class AbstractMap {
    private IDrawningObject _drawningObject = null;

    protected int[][] _map = null;
    protected int _width;
    protected int _height;
    protected float _size_x;
    protected float _size_y;
    protected Random _random = new Random();
    protected int _freeRoad = 0;
    protected int _barrier = 1;

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

    private boolean CanMove(float[] position) //Проверка на возможность шага
    {
        for (int i = (int)(position[2] / _size_y); i <= (int)(position[3] / _size_y); ++i)
        {
            for (int j = (int)(position[0] / _size_x); j <= (int)(position[1] / _size_x); ++j)
            {
                if (i >= 0 && j >= 0 && i < _map.length && j < _map[0].length && _map[i][j] == _barrier) return false;
            }
        }
        return true;
    }

    public BufferedImage MoveObject(Direction direction)
    {
        float[] position = _drawningObject.GetCurrentPosition();
        if (direction == Direction.Left)
        {
            position[0] -= _drawningObject.getStep();
        }
        else if (direction == Direction.Right)
        {
            position[1] += _drawningObject.getStep();
        }
        else if (direction == Direction.Up)
        {
            position[2] -= _drawningObject.getStep();
        }
        else if (direction == Direction.Down)
        {
            position[3] += _drawningObject.getStep();
        }

        if (CanMove(position))
        {
            _drawningObject.MoveObject(direction);
        }
        return DrawMapWithObject();
    }

    private boolean SetObjectOnMap()
    {
        if (_drawningObject == null || _map == null)
        {
            return false;
        }
        int x = _random.nextInt(0, 10);
        int y = _random.nextInt(0, 10);
        _drawningObject.SetObject(x, y, _width, _height);
        for (int i = (int)(_drawningObject.GetCurrentPosition()[2] / _size_y); i <= (int)(_drawningObject.GetCurrentPosition()[3] / _size_y); ++i)
        {
            for (int j = (int)(_drawningObject.GetCurrentPosition()[0] / _size_x); j <= (int)(_drawningObject.GetCurrentPosition()[1] / _size_x); ++j)
            {
                if (_map[i][j] == _barrier) _map[i][j] = _freeRoad;
            }
        }
        return true;
    }
    private BufferedImage DrawMapWithObject()
    {
        BufferedImage bmp = new BufferedImage(_width, _height, BufferedImage.TYPE_INT_RGB);
        if (_drawningObject == null || _map == null)
        {
            return bmp;
        }
        Graphics g = 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(g, i, j);
                }
                else if (_map[i][j] == _barrier)
                {
                    DrawBarrierPart(g, i, j);
                }
            }
        }
        _drawningObject.DrawningObject(g);
        return bmp;
    }
    protected abstract void GenerateMap();
    protected abstract void DrawRoadPart(Graphics g, int i, int j);
    protected abstract void DrawBarrierPart(Graphics g, int i, int j);
}