import java.awt.*;

public class DrawingArtillery {
    private EntityArtillery artillery;
    private DrawingRollers drawingRollers;
    private float _startPosX;
    private float _startPosY;
    private Integer _pictureWidth = null;
    private Integer _pictureHeight = null;
    private final int _artilleryWidth = 80;
    private final int _artilleryHeight = 50;

    public EntityArtillery getArtillery() {
        return artillery;
    }

    public void Init(int speed, float weight, Color bodyColor, int rollersCount) {
        artillery = new EntityArtillery();
        artillery.Init(speed, weight, bodyColor);
        drawingRollers = new DrawingRollers();
        drawingRollers.Init(rollersCount, bodyColor);
    }

    public void SetPosition(int x, int y, int width, int height) {
        if (x < 0 || x + _artilleryWidth >= width)
        {
            return;
        }

        if (y < 0 || y + _artilleryHeight >= height)
        {
            return;
        }

        _startPosX = x;
        _startPosY = y;
        _pictureWidth = width;
        _pictureHeight = height;
    }

    public void moveTransport(Direction direction)
    {
        if (_pictureWidth == null || _pictureHeight == null)
        {
            return;
        }
        switch (direction)
        {
            case Right:
                if (_startPosX + _artilleryWidth + artillery.getStep() < _pictureWidth)
                {
                    _startPosX += artillery.getStep();
                }
                break;

            case Left:
                if (_startPosX - artillery.getStep() >= 0)
                {
                    _startPosX -= artillery.getStep();
                }
                break;

            case Up:
                if (_startPosY - artillery.getStep() >= 0)
                {
                    _startPosY -= artillery.getStep();
                }
                break;

            case Down:
                if (_startPosY + _artilleryHeight + artillery.getStep() < _pictureHeight)
                {
                    _startPosY += artillery.getStep();
                }
                break;
        }
    }

    public void drawTransport(Graphics2D g) {
        if (_startPosX < 0 || _startPosY < 0 || _pictureHeight == null || _pictureWidth == null)
        {
            return;
        }
        g.setColor(artillery.getBodyColor() != null ? artillery.getBodyColor() : Color.BLACK);
        g.fillRect((int) (_startPosX + _artilleryWidth / 8 * 2), (int) _startPosY, _artilleryWidth / 8 * 4, _artilleryWidth / 5);
        g.fillRect((int) _startPosX, (int) (_startPosY + _artilleryHeight / 5), _artilleryWidth, _artilleryHeight / 3);


        g.setColor(Color.GRAY);
        g.fillOval((int) _startPosX, (int) (_startPosY + _artilleryHeight * 2 / 5), _artilleryWidth, _artilleryHeight * 2 / 5);
        drawingRollers.draw(g, (int) _startPosX, (int) _startPosY, _artilleryWidth, _artilleryHeight);
    }

    public void changeBorders(int width, int height)
    {
        _pictureWidth = width;
        _pictureHeight = height;
        if (_pictureWidth <= _artilleryWidth || _pictureHeight <= _artilleryHeight)
        {
            _pictureWidth = null;
            _pictureHeight = null;
            return;
        }
        if (_startPosX + _artilleryWidth > _pictureWidth)
        {
            _startPosX = _pictureWidth - _artilleryWidth;
        }
        if (_startPosY + _artilleryHeight > _pictureHeight)
        {
            _startPosY = _pictureHeight - _artilleryHeight;
        }
    }
}