from machine import Pin, ADC
import utime

# Constantes matérielles
LED_PIN = 15        # LED d'état
BUTTON_PIN = 16     # Bouton start/stop
POT_PIN = 26        # Potentiomètre (ADC0)

POT_RESET_THRESHOLD = 65000

# Initialisation matériel
led = Pin(LED_PIN, Pin.OUT)
button = Pin(BUTTON_PIN, Pin.IN, Pin.PULL_DOWN)
pot = ADC(POT_PIN)

# Variables de logique
running = False
start_time = 0
elapsed_ms = 0
last_button_state = 0
reset_done = False

def format_time(ms):
    total_seconds = ms // 1000
    minutes = total_seconds // 60
    seconds = total_seconds % 60
    millis = ms % 1000
    return f"{minutes:02d}:{seconds:02d}:{millis:03d}"

print("=" * 40)
print("Chronometre IoT - Démarrage")
print("Appuyez sur le bouton pour demarrer/arreter")
print("=" * 40)
print()

last_display_time = 0

while True:
    now_ms = utime.ticks_ms()
    
    # Gestion bouton start/stop
    current_button = button.value()
    if current_button == 1 and last_button_state == 0:
        if not running:
            start_time = utime.ticks_ms()
            running = True
            print(">> Chronometre DEMARRE <<")
        else:
            now = utime.ticks_ms()
            elapsed_ms += utime.ticks_diff(now, start_time)
            running = False
            print(f">> Chronometre ARRETE - Temps: {format_time(elapsed_ms)} <<")
        utime.sleep_ms(50)
    last_button_state = current_button

    # Mise à jour du temps
    if running:
        now = utime.ticks_ms()
        current_elapsed = utime.ticks_diff(now, start_time)
        display_ms = elapsed_ms + current_elapsed
    else:
        display_ms = elapsed_ms

    # LED d'état
    led.value(1 if running else 0)

    # Lecture potentiomètre pour reset
    pot_value = pot.read_u16()
    if pot_value >= POT_RESET_THRESHOLD and not reset_done:
        running = False
        elapsed_ms = 0
        display_ms = 0
        reset_done = True
        print("\n>>> RESET CHRONOMETRE <<<\n")
        utime.sleep_ms(500)
    elif pot_value < POT_RESET_THRESHOLD:
        reset_done = False

    # Affichage console
    if utime.ticks_diff(now_ms, last_display_time) >= 200:
        status = "[EN COURS]" if running else "[ARRETE]"
        print(f"Temps: {format_time(display_ms)} {status} | Potar: {pot_value//1000}%")
        last_display_time = now_ms

    utime.sleep_ms(10)