package KinematicSimulator;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollBar;

/**
 * This is the Frame that contains all the simulation controls.
 *
 * @author Steve
 */

class KinematicController extends JFrame implements ActionListener
{
    KinematicEventListener m_listener = null;

    int gravity = 60;
    int friction = 3;
    int elasticity = 0;
    int radius = 20;

    public KinematicController()
    {
        super("Kinematic Controller");

        this.getContentPane().setLayout(new GridBagLayout());

        GridBagConstraints last = new GridBagConstraints();
        last.gridwidth = GridBagConstraints.REMAINDER;
        last.weightx = 1.0;
        last.fill = last.BOTH;
        last.insets = new Insets(5, 5, 5, 5);

        GridBagConstraints item = new GridBagConstraints();
        item.weightx = 1.0;
        item.insets = new Insets(5, 5, 5, 5);
        last.fill = last.BOTH;

        JScrollBar jsb;

        this.getContentPane().add(new JLabel("Gravity"), item);
        this.getContentPane().add(
            jsb = new JScrollBar(JScrollBar.HORIZONTAL),
            last);

        jsb.setValue(60);

        jsb.addAdjustmentListener(new AdjustmentListener()
        {
            public void adjustmentValueChanged(AdjustmentEvent e)
            {
                gravity = e.getValue();

                updatePhysics();
            }
        });

        this.getContentPane().add(new JLabel("Friction"), item);
        this.getContentPane().add(
            jsb = new JScrollBar(JScrollBar.HORIZONTAL),
            last);

        jsb.setValue(3);

        jsb.addAdjustmentListener(new AdjustmentListener()
        {
            public void adjustmentValueChanged(AdjustmentEvent e)
            {
                friction = e.getValue();

                updatePhysics();
            }
        });

        this.getContentPane().add(new JLabel("Elasticity"), item);
        this.getContentPane().add(
            jsb = new JScrollBar(JScrollBar.HORIZONTAL),
            last);

        jsb.setValue(0);

        jsb.addAdjustmentListener(new AdjustmentListener()
        {
            public void adjustmentValueChanged(AdjustmentEvent e)
            {
                elasticity = e.getValue();

                updatePhysics();
            }
        });

        this.getContentPane().add(new JLabel("Radius"), item);
        this.getContentPane().add(
            jsb = new JScrollBar(JScrollBar.HORIZONTAL),
            last);

        jsb.setValue(20);

        jsb.addAdjustmentListener(new AdjustmentListener()
        {
            public void adjustmentValueChanged(AdjustmentEvent e)
            {
                radius = e.getValue();

                m_listener.changeRadius(radius);
            }
        });

        JButton button;

        this.getContentPane().add(button = new JButton("Clear"), last);

        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                m_listener.removeEntities();
            }
        });

        this.setBounds(400, 0, 300, 180);

        this.setVisible(true);
    }

    public void setKinematicEventListener(KinematicEventListener listener)
    {
        m_listener = listener;

        //set initial physics

        m_listener.kinematicEvent(new NewtonianPhysicsStrategy());
    }

    protected void updatePhysics()
    {
        m_listener.kinematicEvent(
            new NewtonianPhysicsStrategy(
                gravity,
                elasticity,
                friction,
                radius));
    }

    public void actionPerformed(ActionEvent e)
    {
        if (e.getActionCommand().equals("Exit"))
        {
            this.dispose();
        }
    }
}