NAV_ITEMS = [
    ("dashboard", 0, 64),
    ("battery", 64, 128),
    ("temps", 128, 192),
    ("power", 192, 256),
    ("system", 256, 320),
]


class TouchRouter:
    def __init__(self, screen_manager, width=320, height=480, nav_height=56):
        self.screen_manager = screen_manager
        self.width = width
        self.height = height
        self.nav_height = nav_height

    def handle_touch(self, event):
        if not event or not event.pressed:
            return False

        if self._is_bottom_nav(event.y):
            screen = self._screen_for_nav_x(event.x)

            if screen:
                self.screen_manager.go_to(screen)
                return True

        return False

    def _is_bottom_nav(self, y):
        return y >= self.height - self.nav_height

    def _screen_for_nav_x(self, x):
        for screen, start_x, end_x in NAV_ITEMS:
            if start_x <= x < end_x:
                return screen

        return None