import javax.microedition.lcdui.Graphics;

public class Ground 
{
	private int[][] obstacles = 
		new int[GamePanel.WIDTH][GamePanel.HEIGHT];
	
	public void accept(Shape shape)
	{
		for(int x=0; x<4; x++)
		{
			for(int y=0; y<4; y++)
			{
				if(shape.isMember(x, y, false))
				{
					obstacles[shape.getLeft()+x][shape.getTop()+y] = 1;
				}
			}
		}
		deleteFullLine();
	}
	
	private void deleteFullLine()
	{
		for(int y=GamePanel.HEIGHT-1; y>=0; y--)
		{	//先從最下面一行開始
			boolean isFull = true;
			for(int x=0; x<GamePanel.WIDTH; x++)
			{
				if(obstacles[x][y] == 0){
					isFull = false;
					break;
				}
			}
			if(isFull){
				deleteLine( y );
				y++;
			}
		}
	}
	
	private void deleteLine(int lineNum)
	{
		for(int y=lineNum; y>0; y--)
		{
			for(int x=0; x<GamePanel.WIDTH; x++)
			{
				obstacles[x][y] = obstacles[x][y-1];
			}
		}
		for(int x=0; x<GamePanel.WIDTH; x++)
		{
			obstacles[x][0] = 0;
		}
	}
	
	public void paint(Graphics g)
	{
		g.setColor(0x0000FF);
		for(int x=0; x<GamePanel.WIDTH; x++)
		{
			for(int y=0; y<GamePanel.HEIGHT; y++)
			{
				if(obstacles[x][y] == 1)
				{
					g.fillRoundRect(x*Shape.CELL_SIZE, y*Shape.CELL_SIZE,
							Shape.CELL_SIZE, Shape.CELL_SIZE, 5, 5);
				}
			}
		}
	}
	
	public boolean isMoveable(Shape shape, int action)
	{
		int left = shape.getLeft();//保留下次移動之前的left
		int top = shape.getTop();//保留下次移動之前的top
		switch(action)//根據狀態，進行假設移動
		{
		case Shape.LEFT:
			left--;
			break;
		case Shape.RIGHT:
			left++;
			break;
		case Shape.DOWN:
			top++;
			break;
		}
		for(int x=0; x<4; x++)
		{
			for(int y=0; y<4; y++)
			{
				//需要獲取當前格是1的標志再做判斷
				if(shape.isMember(x, y, action==Shape.ROTATE))
				{
					if	(		(y+top >= GamePanel.HEIGHT)	||
								(x+left >= GamePanel.WIDTH)		||
								(x+left < 0)									||
								(obstacles[x+left][y+top] == 1)	
						)
					{
						return false;
					}
				}
			}
		}
		return true;
	}
	
	public boolean isFull()
	{
		for(int x=0; x<GamePanel.WIDTH; x++)
		{
			if(obstacles[x][0] == 1)
				return true;
		}
		return false;
	}
}