#    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.

from positional import positional

from keystoneclient import access
from keystoneclient import auth
from keystoneclient import base
from keystoneclient import exceptions
from keystoneclient.i18n import _


class Token(base.Resource):
    def __repr__(self):
        """Return string representation of resource information."""
        return "<Token %s>" % self._info

    @property
    def id(self):
        return self._info['token']['id']

    @property
    def expires(self):
        return self._info['token']['expires']

    @property
    def tenant(self):
        return self._info['token'].get('tenant')


class TokenManager(base.Manager):
    resource_class = Token

    @positional(enforcement=positional.WARN)
    def authenticate(self, username=None, tenant_id=None, tenant_name=None,
                     password=None, token=None, return_raw=False):
        if token:
            params = {"auth": {"token": {"id": token}}}
        elif username and password:
            params = {"auth": {"passwordCredentials": {"username": username,
                                                       "password": password}}}
        else:
            raise ValueError(
                _('A username and password or token is required.'))
        if tenant_id:
            params['auth']['tenantId'] = tenant_id
        elif tenant_name:
            params['auth']['tenantName'] = tenant_name

        args = ['/tokens', params, 'access']
        kwargs = {'return_raw': return_raw, 'log': False}

        # NOTE(jamielennox): try doing a regular admin query first. If there is
        # no endpoint that can satisfy the request (eg an unscoped token) then
        # issue it against the auth_url.
        try:
            token_ref = self._post(*args, **kwargs)
        except exceptions.EndpointNotFound:
            kwargs['endpoint_filter'] = {'interface': auth.AUTH_INTERFACE}
            token_ref = self._post(*args, **kwargs)

        return token_ref

    def delete(self, token):
        return self._delete("/tokens/%s" % base.getid(token))

    def endpoints(self, token):
        return self._get("/tokens/%s/endpoints" % base.getid(token), "token")

    def validate(self, token):
        """Validate a token.

        :param token: Token to be validated.

        :rtype: :py:class:`.Token`

        """
        return self._get('/tokens/%s' % base.getid(token), 'access')

    def get_token_data(self, token):
        """Fetch the data about a token from the identity server.

        :param str token: The token id.

        :rtype: dict
        """
        url = '/tokens/%s' % token
        resp, body = self.client.get(url)
        return body

    def validate_access_info(self, token):
        """Validate a token.

        :param token: Token to be validated. This can be an instance of
                      :py:class:`keystoneclient.access.AccessInfo` or a string
                      token_id.

        :rtype: :py:class:`keystoneclient.access.AccessInfoV2`

        """
        def calc_id(token):
            if isinstance(token, access.AccessInfo):
                return token.auth_token
            return base.getid(token)

        token_id = calc_id(token)
        body = self.get_token_data(token_id)
        return access.AccessInfo.factory(auth_token=token_id, body=body)

    def get_revoked(self):
        """Return the revoked tokens response.

        The response will be a dict containing 'signed' which is a CMS-encoded
        document.

        """
        resp, body = self.client.get('/tokens/revoked')
        return body
