from machine import Pin, ADC, I2C
from time import sleep_ms, ticks_ms, ticks_diff
import ssd1306

led = Pin("LED", Pin.OUT)
button = Pin(14, Pin.IN, Pin.PULL_UP)
pot = ADC(26)

i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
oled = ssd1306.SSD1306_I2C(128, 64, i2c)

running = False
elapsed_time = 0
start_time = ticks_ms()
reset_done = False

def format_time(ms):
    m = ms // 60000
    s = (ms % 60000) // 1000
    ms_rem = ms % 1000
    return "{:02}:{:02}:{:03}".format(m, s, ms_rem)

while True:
    # Bouton appuye -> changer l'etat
    if button.value() == 0:
        sleep_ms(200)
        if running:
            elapsed_time += ticks_diff(ticks_ms(), start_time)
            running = False
        else:
            start_time = ticks_ms()
            running = True

        # attendre que le bouton soit relache
        while button.value() == 0:
            sleep_ms(10)

    # LED
    if running:
        led.on()
    else:
        led.off()

    # Potentiometre
    pot_value = pot.read_u16()

    if pot_value >= 65000 and not reset_done:
        elapsed_time = 0
        if running:
            start_time = ticks_ms()
        reset_done = True

    if pot_value < 64000:
        reset_done = False

    # Temps
    if running:
        current_time = elapsed_time + ticks_diff(ticks_ms(), start_time)
        status = "RUN"
    else:
        current_time = elapsed_time
        status = "STOP"

    # OLED
    oled.fill(0)
    oled.text("CHRONO", 0, 0)
    oled.text(format_time(current_time), 0, 20)
    oled.text(status, 0, 40)
    oled.show()

    sleep_ms(50)