export const BOX_SIZE = 9;
export const CENTER = Math.floor(BOX_SIZE / 2);



function create_world (size) {
	return Array(BOX_SIZE).fill(0).map(_ => Array(BOX_SIZE).fill(0));
}
const world = create_world(BOX_SIZE);
const parent_stack = [];
let current_world = world;

export function set_tile (x, y, tile) {
	current_world[x][y] = tile;
}

export function get_tile (x, y) {
	return current_world[x][y];
}

export function create_box () {
	return create_world(BOX_SIZE);
}

export function enter_box (box) {
	parent_stack.push(current_world);
	current_world = box;
}

export function exit_box () {
	if (parent_stack.length > 0) {
		current_world = parent_stack.pop();
		return true;
	}
	return false;
}