function calculateSourceSpace(source){
	var count = 0;

	for(let y = -1; y <= 1; y++){
		for(let x = -1; x <= 1; x++){
			if(x == 0 && y == 0) continue;
			for(var object of source.room.lookAt(source.pos.x + x, source.pos.y + y)){
				if(object.type != 'terrain') continue;
				if(object.terrain != 'wall') count++;
			}
		}
	}
	return count;
}

module.exports = { calculateSourceSpace };