from machine import Pin
import time

# Constants
POMODORO_TIME = 25 * 60 * 1000  # 25 minutes in milliseconds

# Button pins
start_button = Pin(0, Pin.IN, Pin.PULL_DOWN)
reset_button = Pin(1, Pin.IN, Pin.PULL_DOWN)

# Global variables
is_running = False
start_time = 0

def start_timer():
    global is_running, start_time
    start_time = time.ticks_ms()
    is_running = True

def reset_timer():
    global is_running
    is_running = False

while True:
    if start_button.value() == 1 and not is_running:
        start_timer()
    elif reset_button.value() == 1:
        reset_timer()

    if is_running:
        current_time = time.ticks_ms()
        elapsed_time = time.ticks_diff(current_time, start_time)

        # Check for overflow (if time difference exceeds max value)
        if elapsed_time < 0:
            elapsed_time = (time.ticks_max() + 1) - start_time + current_time

        minutes = elapsed_time // (1000 * 60)
        seconds = (elapsed_time // 1000) % 60

        print(f"{minutes:02d}:{seconds:02d}", end="\r")

        if elapsed_time >= POMODORO_TIME:
            is_running = False
            print("\nPomodoro finished!")
            # Add a small delay to avoid rapid printing on reset