# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

import typing as ty

from keystoneauth1 import plugin

if ty.TYPE_CHECKING:
    from keystoneauth1 import session as ks_session

SERVICE_AUTH_HEADER_NAME = 'X-Service-Token'

__all__ = ('ServiceTokenAuthWrapper',)


class ServiceTokenAuthWrapper(plugin.BaseAuthPlugin):
    def __init__(
        self,
        user_auth: plugin.BaseAuthPlugin,
        service_auth: plugin.BaseAuthPlugin,
    ):
        super().__init__()
        self.user_auth = user_auth
        self.service_auth = service_auth

    def get_headers(
        self, session: 'ks_session.Session'
    ) -> ty.Optional[dict[str, str]]:
        headers = self.user_auth.get_headers(session) or {}
        token = self.service_auth.get_token(session)
        if token:
            headers[SERVICE_AUTH_HEADER_NAME] = token

        return headers

    def invalidate(self) -> bool:
        # NOTE(jamielennox): hmm, what to do here? Should we invalidate both
        # the service and user auth? Only one? There's no way to know what the
        # failure was to selectively invalidate.
        user = self.user_auth.invalidate()
        service = self.service_auth.invalidate()
        return user or service

    def get_connection_params(
        self, session: 'ks_session.Session'
    ) -> plugin.ConnectionParams:
        # NOTE(jamielennox): This is also a bit of a guess but unlikely to be a
        # problem in practice. We don't know how merging connection parameters
        # between these plugins will conflict - but there aren't many plugins
        # that set this anyway.
        # Take the service auth params first so that user auth params will be
        # given priority.
        params = self.service_auth.get_connection_params(session)
        params.update(self.user_auth.get_connection_params(session))
        return params

    # TODO(jamielennox): Everything below here is a generic wrapper that could
    # be extracted into a base wrapper class. We can do this as soon as there
    # is a need for it, but we may never actually need it.

    def get_token(self, session: 'ks_session.Session') -> ty.Optional[str]:
        return self.user_auth.get_token(session)

    def get_endpoint(
        self, session: 'ks_session.Session', **kwargs: ty.Any
    ) -> ty.Optional[str]:
        return self.user_auth.get_endpoint(session, **kwargs)

    def get_user_id(self, session: 'ks_session.Session') -> ty.Optional[str]:
        return self.user_auth.get_user_id(session)

    def get_project_id(
        self, session: 'ks_session.Session'
    ) -> ty.Optional[str]:
        return self.user_auth.get_project_id(session)

    def get_sp_auth_url(
        self, session: 'ks_session.Session', sp_id: str
    ) -> ty.Optional[str]:
        return self.user_auth.get_sp_auth_url(session, sp_id)

    def get_sp_url(
        self, session: 'ks_session.Session', sp_id: str
    ) -> ty.Optional[str]:
        return self.user_auth.get_sp_url(session, sp_id)