import java.util.Enumeration;
import java.util.Random;
import java.util.Vector;
import com.nttdocomo.io.ConnectionException;
import com.nttdocomo.ui.*;

class PuzzleCanvas extends Canvas
{
	private int level;
	private boolean clear;

	private Image[] images;
	private int[][] piece;
	private int cursorX,cursorY;

	private Vector media;

	// 初期化

	public PuzzleCanvas(int level)
	{
		this.level=level;
		
		setSoftLabel(Panel.SOFT_KEY_1,"終了");
		setSoftLabel(Panel.SOFT_KEY_2,"ﾘｾｯﾄ");
		
		init();
		reset();
	}

	private void init()
	{
		media=new Vector();
		piece=new int[level][level];
		images=new Image[level*level];
		for (int i=0;i<=images.length-1;i++)
		{
			images[i]=loadImage("/image"+
			    Integer.toString(i%level)+Integer.toString(i/level)+".gif");
		}
		PhoneSystem.setAttribute(
		    PhoneSystem.DEV_BACKLIGHT,PhoneSystem.ATTR_BACKLIGHT_ON);
	}

	private Image loadImage(String file)
	{
		MediaImage mediaImage;
	
		mediaImage=MediaManager.getImage("resource://"+file);
		media.addElement(mediaImage);
		try {
			mediaImage.use();
		}
		catch (ConnectionException e)
		{
			e.printStackTrace();
		}
		return mediaImage.getImage();
	}

	private void reset()
	{
		Random random=new Random();
	
		for (int i=0;i<=images.length-1;i++)
		{
			piece[i%level][i/level]=i;
		}
		cursorX=0;
		cursorY=0;
		clear=false;
		for (int i=1;i<=level*level*8;i++)
		{
			if (Math.abs(random.nextInt())%2==0)
			{
				swapPiece(random.nextInt()%2,0);
			}
			else
			{
				swapPiece(0,random.nextInt()%2);
			}
		}
	}

	// 描画処理

	public void paint(Graphics g)
	{
		g.lock();
		g.clearRect(0,0,getWidth(),getHeight());
		for (int y=0;y<=level-1;y++)
		{
			for (int x=0;x<=level-1;x++)
			{
				if (x==cursorX && y==cursorY && !clear)
				{
					g.clearRect(x*30,y*30,30,30);
				}
				else
				{
					g.drawImage(images[piece[x][y]],x*30,y*30);
				}
			}
		}
		g.unlock(true);
	}

	// イベント

	public void processEvent(int type,int param)
	{
		if (type==Display.KEY_PRESSED_EVENT && param==Display.KEY_SOFT1)
		{
			exit();
		}
		if (type==Display.KEY_PRESSED_EVENT && param==Display.KEY_SOFT2)
		{
			reset();
		}
		if (type==Display.KEY_PRESSED_EVENT && !clear)
		{
			if (param==Display.KEY_UP)
			{
				swapPiece(0,-1);
			}
			if (param==Display.KEY_DOWN)
			{
				swapPiece(0,1);
			}
			if (param==Display.KEY_LEFT)
			{
				swapPiece(-1,0);
			}
			if (param==Display.KEY_RIGHT)
			{
				swapPiece(1,0);
			}
			checkClear();
		}
	}

	private void swapPiece(int vx,int vy)
	{
		int swap;
	
		if (vy==-1 && cursorY==0)
		{
			return;
		}
		if (vy==1 && cursorY==level-1)
		{
			return;
		}
		if (vx==-1 && cursorX==0)
		{
			return;
		}
		if (vx==1 && cursorX==level-1)
		{
			return;
		}
		
		swap=piece[cursorX][cursorY];
		piece[cursorX][cursorY]=piece[cursorX+vx][cursorY+vy];
		piece[cursorX+vx][cursorY+vy]=swap;
		
		cursorX=cursorX+vx;
		cursorY=cursorY+vy;
		repaint();
	}

	private void checkClear()
	{
		clear=true;
		for (int i=0;i<=images.length-1;i++)
		{
			if (piece[i%level][i/level]!=i)
			{
				clear=false;
			}
		}
	}

	// 終了

	private void exit()
	{
		MediaResource resource;
	
		for (Enumeration enum=media.elements();enum.hasMoreElements();)
		{
			resource=(MediaResource)(enum.nextElement());
			resource.unuse();
			resource.dispose();
		}
		IApplication.getCurrentApp().terminate();
	}
}