import binascii
import requests

from decouple import config
from pyotp import TOTP
from etcd import EtcdKeyNotFound


def check_otp(name, realm, seed):
    try:
        data = {
            "auth_name": config('AUTH_NAME', ''),
            "auth_token": TOTP(config('AUTH_SEED', '')).now(),
            "auth_realm": config('AUTH_REALM', ''),
            "name": name,
            "realm": realm,
            "token": TOTP(seed).now()
        }
    except binascii.Error:
        return 400

    response = requests.post(
        "{OTP_SERVER}{OTP_VERIFY_ENDPOINT}".format(
            OTP_SERVER=config('OTP_SERVER', ''),
            OTP_VERIFY_ENDPOINT=config('OTP_VERIFY_ENDPOINT', 'verify/')
        ),
        data=data
    )
    return response.status_code


def get_next_id(client, path):
    try:
        r = client.read(path)
    except EtcdKeyNotFound:
        return 0

    max_key_result = max(r.children, key=lambda x: int(strip_nondigit(x.key)))
    if max_key_result is None:
        # No key found
        return 0

    max_key = strip_nondigit(max_key_result.key.split("/")[-1])  # Get the last portion of key

    return int(max_key) + 1


def strip_nondigit(s):
    return "".join([char for char in s if char.isdigit()])