import time
from pathlib import Path


def find_available_ports():
    ports = []
    for path in Path("/dev").glob("tty*"):
        ports.append(str(path))
    return ports


def find_port():
    print("Finding all available ports for the MotorsBus.")
    ports_before = find_available_ports()
    print(ports_before)

    print("Remove the usb cable from your MotorsBus and press Enter when done.")
    input()

    time.sleep(0.5)
    ports_after = find_available_ports()
    ports_diff = list(set(ports_before) - set(ports_after))

    if len(ports_diff) == 1:
        port = ports_diff[0]
        print(f"The port of this MotorsBus is '{port}'")
        print("Reconnect the usb cable.")
    elif len(ports_diff) == 0:
        raise OSError(f"Could not detect the port. No difference was found ({ports_diff}).")
    else:
        raise OSError(f"Could not detect the port. More than one port was found ({ports_diff}).")


if __name__ == "__main__":
    # Helper to find the usb port associated to all your MotorsBus.
    find_port()