import random
from time import *
from datetime import datetime
from datetime import timedelta

from daemonJwtHandler.constants import auth
from daemonJwtHandler.logic import jwt_services


def get_jwt_cache_expiry(jwt_token_expiration):
    """Compute jwt cache expiry.
    Args:
        jwt_token_expiration (str): jwt token expiration utc time.
    Returns:
        dict: cache expiration time and expiry in seconds.
    """
    jwtInstance = jwt_services.JwtServices.getInstance()
    log = jwtInstance.logger()
    try:
        # Current Time
        current_time = datetime.utcnow()
        # JWT expiration Time
        jwt_expiration_date_time_obj = datetime.strptime(
            jwt_token_expiration, '%Y-%m-%d %H:%M:%S.%f')
        # Random jitter
        random_jitter = random.randint(0, 60)
        # Actual expiration time for cache with delta and jitter in seconds
        actual_expiration_time = \
            jwt_expiration_date_time_obj - timedelta(
                seconds=auth.TOKEN_EXPIRATION_DELTA - random_jitter)

        # JWT time to expiry datetime object
        token_expiration = actual_expiration_time - current_time
        # JWT time to expiry in seconds
        token_expiration_in_seconds = token_expiration.days * 24 * 3600 + \
            token_expiration.seconds

        return {
            'jwt_expiration_time': actual_expiration_time,
            'jwt_expiry_secs': token_expiration_in_seconds
        }
    except Exception as e:
        log.info(
            f'Failed to compute jwt cache timeout in '
            f'Exception: {str(e)}')
        # If cache timeout not computed as expected, default timeout is set
        return {
            'jwt_expiration_time': None,
            'jwt_expiry_secs': -1
        }