from machine import Pin
import time

start = False
stop = False

def handle_interrupt_start(pin):
    global start
    start = True
    global interrupt_pin_start
    interrupt_pin_start = pin

def handle_interrupt_stop(pin):
    global stop
    stop = True
    global interrupt_pin_stop
    interrupt_pin_stop = pin

button_start = Pin(10, Pin.IN, Pin.PULL_UP)
button_stop = Pin(14, Pin.IN, Pin.PULL_UP)


led_red_1 = Pin(23,Pin.OUT)
led_yellow_1 = Pin(19,Pin.OUT)
led_green_1 = Pin(2,Pin.OUT)

def reset_semaforo():
    led_green_1.off()
    led_red_1.off()
    led_yellow_1.off()

def sleep_and_check(useconds):
    global stop
    count = 0
    while count < useconds:
        time.sleep(0.001)
        if stop:
            reset_semaforo()
            stop = False
            start = False
            return False
        count = count + 1
    return True


def semaforo_1():
    led_green_1.on()
    led_red_1.off()
    next_ = sleep_and_check(8000)
    if next_: 
        led_yellow_1.on()
        led_green_1.off()
        next_ = sleep_and_check(2000)

        if next_:
            led_red_1.on()
            led_yellow_1.off()
            sleep_and_check(8000)

button_start.irq(trigger=Pin.IRQ_RISING, handler=handle_interrupt_start)
button_stop.irq(trigger=Pin.IRQ_RISING, handler=handle_interrupt_stop)

while True:
    if start:
        next_ = sleep_and_check(1000)
        if next_: 
            semaforo_1()