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"""
Connects to the first FIDO device found which supports Authenticator Config.
"""
from fido2.hid import CtapHidDevice
from fido2.ctap2 import Ctap2
from fido2.ctap2.pin import ClientPin
from fido2.ctap2.config import Config
from getpass import getpass
import sys

try:
    from fido2.pcsc import CtapPcscDevice
except ImportError:
    CtapPcscDevice = None


def enumerate_devices():
    for dev in CtapHidDevice.list_devices():
        yield dev
    if CtapPcscDevice:
        for dev in CtapPcscDevice.list_devices():
            yield dev


# Locate a device
for dev in enumerate_devices():
    try:
        ctap2 = Ctap2(dev)
        if ctap2.info.options.get("authnrCfg"):
            break
    except ValueError:
        pass
else:
    print("No Authenticator supports config!")
    sys.exit(1)

if not ctap2.info.options.get("clientPin"):
    print("PIN must be configured")
    sys.exit(1)

pin = getpass("Please enter PIN:")

client_pin = ClientPin(ctap2)
token = client_pin.get_pin_token(pin, ClientPin.PERMISSION.AUTHENTICATOR_CFG)

config = Config(ctap2, client_pin.protocol, token)

config.set_min_pin_length(4)
