package speiger.src.coreengine.math.collision2d;

import java.util.Iterator;

import speiger.src.coreengine.math.vector.ints.Vec2i;

public class Mixed2DCollision implements I2DCollision
{
	I2DCollision mainBox;
	I2DCollision[] subBoxes;
	
	public Mixed2DCollision(I2DCollision mainBox, I2DCollision...subBoxes)
	{
		this.mainBox = mainBox;
		this.subBoxes = subBoxes;
	}
	
	@Override
	public boolean isColliding(int x, int y)
	{
		return mainBox.isColliding(x, y) && isCollidingInSubBox(x, y);
	}
	
	public boolean isCollidingInSubBox(int x, int y)
	{
		for(int i = 0,m=subBoxes.length;i<m;i++)
		{
			if(!subBoxes[i].isColliding(x, y))
			{
				return false;
			}
		}
		return true;
	}
	
	@Override
	public Iterator<Vec2i> iterator()
	{
		return new Iterator<Vec2i>(){
			Iterator<Vec2i> mainIter = mainBox.iterator();
			Vec2i cache = findNext(Vec2i.newMutable());
			Vec2i result = Vec2i.newMutable();
			@Override
			public boolean hasNext()
			{
				return cache != null;
			}

			@Override
			public Vec2i next()
			{
				result.set(cache);
				cache = findNext(cache);
				return result;
			}
			
			Vec2i findNext(Vec2i input)
			{
				while(mainIter.hasNext())
				{
					Vec2i next = mainIter.next();
					if(isCollidingInSubBox(next.getX(), next.getY()))
					{
						return input.set(next);
					}
				}
				return null;
			}
		};
	}
	
}