from lcdMenu import lcdMenu
from machine import Pin, I2C
from PCF8574T import I2C_LCD

prev_btn = Pin(13, Pin.IN, Pin.PULL_DOWN)  # input of the first btn
next_btn = Pin(14, Pin.IN, Pin.PULL_DOWN)  # input of the second btn
ok_btn   = Pin(15, Pin.IN, Pin.PULL_DOWN)  # input of switch

LCD = I2C_LCD(I2C(0, sda=Pin(8), scl=Pin(9), freq=400000),0x27,2, 16)

def first_callback():
    print("first_callback() called!")
def second_cb():
    print("second_cb() called")
def third_cb():
    print("third_cb() called")
    return True


button_mappings = {"prev_btn":prev_btn, "next_btn": next_btn, "ok_btn": ok_btn}

submenu = lcdMenu(LCD, button_mappings, scroll_direction=True, cycle=False, hide_menu_name=False, name="Submenu!")
# the submenu.stop callback is a special callback specifically designed for use cases where the lcdMenu ist started with run()
# submenu.stop breaks an infinite loop inside the run() method, essentially quitting the run() method and giving back flow to the caller context
# so we can utilize this for us to quit a submenu (or a "main" menu if you want to, of course!)
submenuItems = [("first item", first_callback),
                ("second item", second_cb),
                ("third item", third_cb),
                ("back", submenu.stop)]  
submenu.setup(submenuItems)

mainmenu = lcdMenu(LCD, button_mappings, scroll_direction=False, cycle=True, hide_menu_name=False, name="Main menu!")
mainmenu.setup([("Sub menu",submenu.run)])

mainmenu.run()