import sys
import os

current = os.path.dirname(os.path.realpath(__file__))
parent = os.path.dirname(current)
sys.path.append(parent)

import tornado

from ioutils.base import BaseHandler
from ioutils.errors import ErrorCode, ErrorMessage

from piracyshield_service.security.blacklist.exists_by_refresh_token import SecurityBlacklistExistsByRefreshTokenService

from piracyshield_service.authentication.refresh_access_token import AuthenticationRefreshAccessTokenService

from piracyshield_component.exception import ApplicationException

class AuthenticationRefreshHandler(BaseHandler):

    """
    Get another JWT access token once the main has expired.
    """

    optional_fields = [
        'refresh_token'
    ]

    async def post(self):
        # use stored refresh token when available
        refresh_token = self.get_refresh_cookie()

        # if no cookie available, generate a new access_token via POSTed refresh_token
        if not refresh_token:
            # if no refresh_token is found, we have an error
            if self.handle_post(required_fields = None, optional_fields = self.optional_fields) == False:
                return

            if not self.request_data.get('refresh_token'):
                return self.error(status_code = 401, error_code = ErrorCode.MISSING_REFRESH_TOKEN, message = ErrorMessage.MISSING_REFRESH_TOKEN)

            refresh_token = self.request_data.get('refresh_token')

        try:
            security_blacklist_exists_by_refresh_token_service = SecurityBlacklistExistsByRefreshTokenService()

            if security_blacklist_exists_by_refresh_token_service.execute(
                refresh_token = refresh_token
            ) == True:
                self.error(status_code = 401, error_code = ErrorCode.TOKEN_EXPIRED, message = ErrorMessage.TOKEN_EXPIRED)

                return False

            authentication_refresh_access_token_service = AuthenticationRefreshAccessTokenService()

            access_token = await tornado.ioloop.IOLoop.current().run_in_executor(
                None,
                authentication_refresh_access_token_service.execute,
                refresh_token,
                self.ip_address
            )

            # return the access_token
            self.success(data = {
                'access_token': access_token
            })

        except ApplicationException as e:
            self.error(status_code = 400, error_code = e.code, message = e.message)