import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class JumpScreen extends GameCanvas
implements Runnable
{
	private Display display;
	private GameScreen gameScreen;
	private GameMap gameMap;
	private boolean isJumping = false;
	private int colNum = 3,
				rowNum = 7,
				itemNum = 21,
				curItem = 0,
				x,y,
				splitH = 15,splitV = 10,
				w = 20,h = 10;
	private Image borderImage = GameScreen.getImage(GameScreen.IMAGE_BORDER2);
	
	public JumpScreen(Display display,GameScreen gameScreen,
		GameMap gameMap)
	{
		super(false);
		this.display = display;
		this.gameScreen = gameScreen;
		this.gameMap = gameMap;
		this.setFullScreenMode(true);
	}
	
	private void next()
	{
		if((curItem+1)<itemNum)curItem ++;
		else curItem = 0;
	}
	
	private void pre()
	{
		if((curItem - 1) >= 0) curItem --;
		else curItem = itemNum - 1;
	}
	
	private void right()
	{
		if((curItem + rowNum) < itemNum){
			curItem += rowNum;
		}
	}
	
	private void left()
	{
		if((curItem - rowNum) >= 0){
			curItem -= rowNum;
		}
	}
	
	private void calcXY(int item)
	{
		//int col = item % colNum;
		//int row = (item - col) / rowNum;
		int col = item / rowNum;
		int row = item - col * rowNum;
		x = col * w + splitH * (col + 1)+ gameScreen.borderX -2 ;
		y = row * h + splitV * (row + 1)+ gameScreen.borderY;
	}
	
	private void drawItem(Graphics g)
	{
		g.setColor(0x985415);
		for(int i = 0;i < itemNum;i ++)
		{
			calcXY(i);
			g.drawString("第"+i+"層",x,y,Graphics.TOP | Graphics.LEFT);
		}
	}
	
	private void render(Graphics g)
	{
		g.setColor(0,0,0);
		g.fillRect(0,0,getWidth(),getHeight());
		g.drawImage(borderImage,
			gameScreen.borderX,gameScreen.borderY,Graphics.TOP | Graphics.LEFT);
		
		drawItem(g);
		
		calcXY(curItem);
		g.setColor(255,200,0);
		g.drawString("第"+curItem+"層",x,y,Graphics.TOP | Graphics.LEFT);
		flushGraphics();
	}
	
	private void tick()
	{
		int keyState = getKeyStates();
		if ((keyState & this.DOWN_PRESSED) != 0){
			next();
		}else if((keyState & UP_PRESSED) != 0){
			pre();
		}else if ((keyState & this.RIGHT_PRESSED) != 0){
			right();
		}else if ((keyState & this.LEFT_PRESSED) != 0){
			left();
		}else if ((keyState & this.FIRE_PRESSED) != 0){
			gameMap.jump(curItem);
			stop();
		}
	}
	
	public void start()
	{
		isJumping = true;
		Thread t = new Thread(this);
		t.start();
	}
	private void stop()
	{
		isJumping = false;
		display.setCurrent(gameScreen);
	}
	
	public void run()
	{
		Graphics g = getGraphics();
		long startTime = 0;
	  	long timeTake = 0;
		while(isJumping == true)
		{
			startTime = System.currentTimeMillis();
			tick();
			render(g);
			timeTake = System.currentTimeMillis() - startTime;
			if (timeTake < GameScreen.MILLIS_PER_TICK)
	  		{
	  	        try
	  			{
	  				
	  				Thread.sleep(GameScreen.MILLIS_PER_TICK - timeTake);
	  			} catch(InterruptedException e){System.out.println(e);} 
	  		}
		}
	}
	
	protected void keyPressed(int keyCode)
	{
		if(keyCode == GameCanvas.KEY_NUM1)stop();
	}
}