/**
 * Write a description of class FifteenPuzzle here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */

import java.awt.event.*;
import java.awt.Color;

public class FifteenPuzzle 
{ 
    private int[][] grid; // the current positions of the tiles and space, denoted by 0..15
    private int xspace;   // xspace,yspace are the current coordinates of the space
    private int yspace;
    private SimpleCanvas sc; // the canvas for display 
     
    private final int size     = 4;               // the number of tiles across and down 
    private final int tilesize = 50;              // the size of a tile
    private final int gridsize = size * tilesize; // the size of the grid 
    
    private        int[][] goal    = {{1, 5,9,13}, {2,6,10,14}, {3,7,11,15}, {4,8,12, 0}};
    // these two are public so that they can be used in BlueJ 
    public  static int[][] close   = {{1, 5,9,13}, {2,6,10,14}, {3,7,11, 0}, {4,8,12,15}};
    public  static int[][] example = {{5,11,14,0}, {9,3,13, 7}, {2,8,10,12}, {4,1,15, 6}};
    
    // this constructor sets up the grid as initialGrid and displays it on the canvas
    // (plus it initialises the other instance variables)
    public FifteenPuzzle (int[][] initialGrid)
    {
        // TODO
    }
    
    // this constructor sets up the grid as goal, 
    // then it makes random moves to set up the puzzle and displays it on the canvas
    // (plus it initialises the other instance variables) 
    public FifteenPuzzle ()
    {
        // TODO
    }
    
    // returns true iff x,y is adjacent to the space
    private boolean legalClick(int x, int y)
    {
        // TODO
        return false;
    }
    
    // returns true iff the puzzle is finished
    private boolean finished()
    {
        // TODO
        return false;
    }
    
    // moves the tile at x,y into the space, if it is adjacent, and re-draws the grid; o/w do nothing 
    public void moveTile (int x, int y)
    {
        // TODO
    }
    
    // draws the current grid on the canvas
    private void drawGrid()
    {
        // TODO
    }
    
    // draws the tile at x,y in colour c at the appropriate spot on the canvas
    private void drawTile(int x, int y, Color c)
    {
        //TODO
    }
}