# Copyright (c) 2020 Yubico AB
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"""
Connects to the first FIDO device found over USB, and attempts to enroll a new
fingerprint. This requires that a PIN is already set.

NOTE: This uses a draft bio enrollment specification which is not yet final.
Consider this highly experimental.
"""
from __future__ import print_function, absolute_import, unicode_literals

from fido2.hid import CtapHidDevice
from fido2.ctap2 import Ctap2, ClientPin, FPBioEnrollment, CaptureError
from getpass import getpass
import sys

pin = None
uv = "discouraged"

for dev in CtapHidDevice.list_devices():
    try:
        ctap = Ctap2(dev)
        if "bioEnroll" in ctap.info.options:
            break
    except Exception:  # nosec
        continue
else:
    print("No Authenticator supporting bioEnroll found")
    sys.exit(1)

if not ctap.info.options.get("clientPin"):
    print("PIN not set for the device!")
    sys.exit(1)

# Authenticate with PIN
print("Preparing to enroll a new fingerprint.")
pin = getpass("Please enter PIN: ")
client_pin = ClientPin(ctap)
pin_token = client_pin.get_pin_token(pin, ClientPin.PERMISSION.BIO_ENROLL)
bio = FPBioEnrollment(ctap, client_pin.protocol, pin_token)

print(bio.enumerate_enrollments())

# Start enrollment
enroller = bio.enroll()
template_id = None
while template_id is None:
    print("Press your fingerprint against the sensor now...")
    try:
        template_id = enroller.capture()
        print(enroller.remaining, "more scans needed.")
    except CaptureError as e:
        print(e)
print("Fingerprint registered successfully with ID:", template_id)
