from machine import Pin, I2C
import ssd1306

# Configurar conexión I2C y crear objeto de pantalla SSD1306
i2c = I2C(-1, scl=Pin(22), sda=Pin(21))
oled = ssd1306.SSD1306_I2C(128, 64, i2c)

# Definir lista de opciones del menú
menu_options = ["Opcion 1", "Opcion 2", "Opcion 3"]
selected_option = 0

button_up = Pin(25, Pin.IN)
button_down = Pin(33, Pin.IN)

prev_button_up_state = button_up.value()
prev_button_down_state = button_down.value()

while True:
    # Limpiar pantalla y mostrar título del menú
    oled.fill(0)
    oled.text("Main Menu", 0 ,0 )
    
    # Mostrar las opciones del menú resaltando la opción seleccionada actualmente
    for index , option in enumerate(menu_options):
        if index == selected_option:
            oled.text("* " + option ,0 ,(index+1)*10 )
        else:
            oled.text(option ,5 ,(index+1)*10 )

    oled.show()
    
    current_button_up_state = button_up.value()
    
    if current_button_up_state != prev_button_up_state and current_button_up_state == 0:   # Flanco ascendente en el botón Up
        selected_option -= 1     # Disminuir valor de selected_option
        
        if selected_option < 0:
            selected_option = len(menu_options) - 1
    
    prev_button_up_state = current_button_up_state

    current_button_down_state = button_down.value()
    
    if current_button_down_state != prev_button_down_state and current_button_down_state == 0:   # Flanco ascendente en el botón Down
        selected_option += 1     # Aumentar valor de selected_option
        
        if selected_option >= len(menu_options):
            selected_option = 0
    
    prev_button_down_state = current_button_down_state