import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

/**
 *  Program keeps track of sorting activities and then displays them.
 *  Students do not need to read or edit this file.
 *  CardSortDemo.java demonstrates how to use it.
 *
 *  @author Nicholas R. Howe
 *  @version 28 February 2011
 */
public class SortRecorder extends JComponent implements ChangeListener {
    /** Keeps track of moves */
    private LinkedList<LinkedList<CardPile>> record;

    /** Keeps track of where new piles go */
    int offset;

    /** Keeps track of how big window needs to be */
    int maxoffset;

    /** Keeps track of current state to display */
    int index;

    /** Constructor */
    public SortRecorder() {
        record = new LinkedList<LinkedList<CardPile>>();
        record.add(new LinkedList<CardPile>());
        offset = 2;
        index = 0;
    }

    /** Adds a pile to the current record */
    public void add(CardPile pile) {
        LinkedList<CardPile> piles = record.removeLast();
        CardPile cpile = new CardPile(pile);  // make a copy
        cpile.setX(offset);
        cpile.setY(2);
        piles.add(cpile);
        record.add(piles);
        offset += 72+12*pile.size();
        if (offset > maxoffset) {
            maxoffset = offset;
        }
    }

    /** Moves on to the next record */
    public void next() {
        record.add(new LinkedList<CardPile>());
        offset = 0;
    }

    /** Creates a window to put the display into */
    public void display(String title) {
        if (record.getLast().size()==0) {
            // remove empty last record
            record.remove();
        }
        if (record.size() == 0) {
            // need at least one empty record to display
            record.add(new LinkedList<CardPile>());
        }

        // Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        // Create and set up the window.
        JFrame frame = new JFrame(title);
        try { frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	} catch (Exception e) {}

	// Add components
        JSlider slider = new JSlider(JSlider.HORIZONTAL,1,record.size(),1);
        slider.setMajorTickSpacing(record.size());
        slider.setMinorTickSpacing(1);
        slider.setPaintTicks(true);
        //slider.setPaintLabels(true);
        slider.setSnapToTicks(true);
        slider.addChangeListener(this);
	frame.getContentPane().add(this);
        frame.getContentPane().add(slider,BorderLayout.SOUTH);

        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public void stateChanged(ChangeEvent e) {
        JSlider source = (JSlider)e.getSource();
        //if (!source.getValueIsAdjusting()) {
            index = (int)source.getValue()-1;
            repaint();
            //}
    }

    public void paintComponent(Graphics g) {
        g.setColor(Color.GREEN.darker());
        g.fillRect(0,0,maxoffset,100);
        LinkedList<CardPile> piles = record.get(index);
        for (CardPile pile: piles) {
            pile.draw(g);
        }
    }

    public Dimension getMinimumSize() {
        return new Dimension(Math.min(1000,maxoffset),100);
    }

    public Dimension getPreferredSize() {
        return new Dimension(Math.min(1000,maxoffset),100);
    }
}