#    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 keystoneclient import base


class Limit(base.Resource):
    """Represents a project limit.

    Attributes:
      * id: a UUID that identifies the project limit
      * service_id: a UUID that identifies the service for the limit
      * region_id: a UUID that identifies the region for the limit
      * project_id: a UUID that identifies the project for the limit
      * resource_name: the name of the resource to limit
      * resource_limit: the limit to apply to the project
      * description: a description for the project limit

    """

    pass


class LimitManager(base.CrudManager):
    """Manager class for project limits."""

    resource_class = Limit
    collection_key = 'limits'
    key = 'limit'

    def create(self, project, service, resource_name, resource_limit,
               description=None, region=None, **kwargs):
        """Create a project-specific limit.

        :param project: the project to create a limit for.
        :type project: str or :class:`keystoneclient.v3.projects.Project`
        :param service: the service that owns the resource to limit.
        :type service: str or :class:`keystoneclient.v3.services.Service`
        :param resource_name: the name of the resource to limit
        :type resource_name: str
        :param resource_limit: the quantity of the limit
        :type resource_limit: int
        :param description: a description of the limit
        :type description: str
        :param region: region the limit applies to
        :type region: str or :class:`keystoneclient.v3.regions.Region`

        :returns: a reference of the created limit
        :rtype: :class:`keystoneclient.v3.limits.Limit`

        """
        limit_data = base.filter_none(
            project_id=base.getid(project),
            service_id=base.getid(service),
            resource_name=resource_name,
            resource_limit=resource_limit,
            description=description,
            region_id=base.getid(region),
            **kwargs
        )
        body = {self.collection_key: [limit_data]}
        resp, body = self.client.post('/limits', body=body)
        limit = body[self.collection_key].pop()
        return self.resource_class(self, limit)

    def update(self, limit, project=None, service=None, resource_name=None,
               resource_limit=None, description=None, **kwargs):
        """Update a project-specific limit.

        :param limit: a limit to update
        :param project: the project ID of the limit to update
        :type project: str or :class:`keystoneclient.v3.projects.Project`
        :param resource_limit: the limit of the limit's resource to update
        :type: resource_limit: int
        :param description: a description of the limit
        :type description: str

        :returns: a reference of the updated limit.
        :rtype: :class:`keystoneclient.v3.limits.Limit`

        """
        return super(LimitManager, self).update(
            limit_id=base.getid(limit),
            project_id=base.getid(project),
            service_id=base.getid(service),
            resource_name=resource_name,
            resource_limit=resource_limit,
            description=description,
            **kwargs
        )

    def get(self, limit):
        """Retrieve a project limit.

        :param limit:
            the project-specific limit to be retrieved.
        :type limit:
            str or :class:`keystoneclient.v3.limit.Limit`

        :returns: a project-specific limit
        :rtype: :class:`keystoneclient.v3.limit.Limit`

        """
        return super(LimitManager, self).get(limit_id=base.getid(limit))

    def list(self, service=None, region=None, resource_name=None, **kwargs):
        """List project-specific limits.

        Any parameter provided will be passed to the server as a filter

        :param service: service to filter limits by
        :type service: UUID or :class:`keystoneclient.v3.services.Service`
        :param region: region to filter limits by
        :type region: UUID or :class:`keystoneclient.v3.regions.Region`
        :param resource_name: the name of the resource to filter limits by
        :type resource_name: str

        :returns: a list of project-specific limits.
        :rtype: list of :class:`keystoneclient.v3.limits.Limit`

        """
        return super(LimitManager, self).list(
            service_id=base.getid(service),
            region_id=base.getid(region),
            resource_name=resource_name,
            **kwargs
        )

    def delete(self, limit):
        """Delete a project-specific limit.

        :param limit: the project-specific limit to be deleted.
        :type limit: str or :class:`keystoneclient.v3.limit.Limit`

        :returns: Response object with 204 status
        :rtype: :class:`requests.models.Response`

        """
        return super(LimitManager, self).delete(limit_id=base.getid(limit))