N = get_world_size()

def within(p, r):
	return (
		r[0] <= p[0] and
		p[0] < r[1]  and
		r[2] <= p[1] and
		p[1] < r[3]
	)

def mv(tx, ty, wrap=False):
	x = get_pos_x()
	if wrap:
		east_step = (tx + N - x) % N
		west_step = (x + N - tx) % N

		if east_step < west_step:
			for i in range(east_step):
				if not move(East):
					return False
		else:
			for i in range(west_step):
				if not move(West):
					return False
	else:
		for i in range(max(0, tx-x)):
			if not move(East):
				return False
		for i in range(max(0, x-tx)):
			if not move(West):
				return False

	y = get_pos_y()
	
	if wrap:
		north_step = (ty + N - y) % N
		south_step = (y + N - ty) % N

		if north_step < south_step:
			for i in range(north_step):
				if not move(North):
					return False
		else:
			for i in range(south_step):
				if not move(South):
					return False
	else:
		for i in range(max(0, ty-y)):
			if not move(North):
				return False
		for i in range(max(0, y-ty)):
			if not move(South):
				return False

	return True

def water():
	if get_water() < 0.5:
		use_item(Items.Water)

def grass():
	typ = get_ground_type()
	if typ != Grounds.Grassland:
		till()

def soil():
	typ = get_ground_type()
	if typ != Grounds.Soil:
		till()

def harv():
	if can_harvest():
		harvest()
		return True
	return False

def replant(entity):
	typ = get_entity_type()
	if typ != entity:
		harvest()
		plant(entity)

def spawn(func, x=0, y=0):
	mv(x, y)
	drone = None
	while drone == None:
		drone = spawn_drone(func)
	return drone

def meas(arg=None):
	ret = None
	while ret == None:
		ret = measure(arg)
	return ret