"""Shared navigation helpers (home, menu, popups, back/escape)."""

# The mailbox/cafe/shop-style header bar renders a plain light background
# here; the home screen shows character art instead.
SUBSCREEN_HEADER_PROBE = (500, 10)
SUBSCREEN_HEADER_MIN_CHANNEL = 200

# Any modal dialog dims the screen behind it to roughly this darkness.
MODAL_DIM_PROBE = (960, 200)
MODAL_DIM_MAX_CHANNEL = 150


def is_on_subscreen(driver):
    r, g, b = driver.color_at(*SUBSCREEN_HEADER_PROBE)
    return r > SUBSCREEN_HEADER_MIN_CHANNEL and g > SUBSCREEN_HEADER_MIN_CHANNEL and b > SUBSCREEN_HEADER_MIN_CHANNEL


def is_modal_open(driver):
    r, g, b = driver.color_at(*MODAL_DIM_PROBE)
    return r < MODAL_DIM_MAX_CHANNEL and g < MODAL_DIM_MAX_CHANNEL and b < MODAL_DIM_MAX_CHANNEL