import pyotp
import time
import os

def clear_screen():
    os.system("cls" if os.name == "nt" else "clear")

def show_otp(issuer, account, secret):
    totp = pyotp.TOTP(secret)
    try:
        while True:
            clear_screen()
            current_otp = totp.now()
            time_remaining = totp.interval - (int(time.time()) % totp.interval)
            print("TOTP Authenticator\n")
            print(f"{issuer}\n{account}\n")
            print(current_otp)
            print(f"\nRemaining: {time_remaining:2} sec")
            for i in range(time_remaining, 0, -1):
                print(f"\rRefresh in: {i:2} sec", end="")
                time.sleep(1)
                if i == 1:
                    break
    except KeyboardInterrupt:
        pass
    print("\nEND")

def app():
    issuer = None
    account = None
    secret = None
    try:
        show_otp(issuer, account, secret)
    except KeyboardInterrupt:
        pass
    
if __name__ == "__main__":
    app()