package gui;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseListener;
import java.util.HashMap;
import javax.swing.JPanel;

public class RobotEnviromentSensorPanel extends JPanel 
{
    private HashMap brick_images_;
    private Image current_image_;
    private int internal_state_;
    public final static int WALL = 1;
    public final static int FREE = 2;
    private boolean changeable_;
    
    public RobotEnviromentSensorPanel(HashMap brick_images) 
    {
        super();
        brick_images_ = brick_images;
        changeable_=true;
        internal_state_ = FREE;
        current_image_ = (Image) brick_images_.get("FREE_GROUND");
        //this.setToolTipText("Anklicken um den Sensortyp zu ändern.");
        initMouseListener();
    }

    public RobotEnviromentSensorPanel(HashMap brick_images, int init_state) 
    {
        super();
        brick_images_ = brick_images;
        changeable_=true;
        setInternalState(init_state);
        //this.setToolTipText("Anklicken um den Sensortyp zu ändern.");
        initMouseListener();
    }
    
    private void setInternalState(int new_state) 
    {
        // MUST BE REWRITTEN IF A NEW CONST IS ADDED !!!    	
        if ((new_state >= WALL) && (new_state <= FREE))
            internal_state_ = new_state;
        else
        	System.err.println("State must be >=" + WALL + "and <= " + FREE);
        paintState();
    }

    public int getInternalState() 
    {
        return internal_state_;
    }
    
    
    public void paintComponent(Graphics g) 
    {
        super.paintComponent(g);
        g.drawImage(current_image_, 0, 0, this);
    }

    private void paintState() 
    {
        if (internal_state_ == WALL)
            current_image_ = (Image) brick_images_.get("WALL_GROUND");
        else if (internal_state_ == FREE) 
            current_image_ = (Image) brick_images_.get("FREE_GROUND");
        RobotEnviromentSensorPanel.this.repaint();
    }

    public void setChangeable(boolean change)
    {
    	changeable_=change;
    	MouseListener[] mls = (MouseListener[])(this.getListeners(MouseListener.class));
    	if (changeable_==true && mls.length==0)
    		initMouseListener();
    	else if (changeable_==false && mls.length >=1)
    		removeMouseListener();
	}
	
	public boolean getChangeable()
	{
		return changeable_;
	}
	
    private void initMouseListener() 
    {
	    MouseListener[] mls = (MouseListener[])(this.getListeners(MouseListener.class));
		if(mls.length==0)
		{
        this.addMouseListener(new java.awt.event.MouseAdapter() 
        {
            public void mouseClicked(java.awt.event.MouseEvent evt) 
            {
                if (internal_state_ == FREE) 
                {
                    internal_state_ = WALL;
            	} 
            	else if (internal_state_ == WALL) 
            	{
                    internal_state_ = FREE;
                }
                paintState();
            }
        });
    	}
    }
    
    private void removeMouseListener()
    {
	    MouseListener[] mls = (MouseListener[])(this.getListeners(MouseListener.class));
	    this.removeMouseListener(mls[0]);
	} 
}