# Copyright 2014 Rackspace, Inc.
# All Rights Reserved
#
#    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.

"""
Abstract base class for dhcp providers.
"""

import abc

from oslo_log import log as logging

LOG = logging.getLogger(__name__)


class BaseDHCP(object, metaclass=abc.ABCMeta):
    """Base class for DHCP provider APIs."""

    @abc.abstractmethod
    def update_port_dhcp_opts(self, port_id, dhcp_options, context=None):
        """Update one or more DHCP options on the specified port.

        :param port_id: designate which port these attributes
                        will be applied to.
        :param dhcp_options: this will be a list of dicts, e.g.

                             ::

                              [{'opt_name': '67',
                                'opt_value': 'pxelinux.0',
                                'ip_version': 4},
                               {'opt_name': '66',
                                'opt_value': '123.123.123.456',
                                'ip_version': 4}]
        :param context: request context
        :type context: ironic.common.context.RequestContext
        :raises: FailedToUpdateDHCPOptOnPort
        """

    @abc.abstractmethod
    def update_dhcp_opts(self, task, options, vifs=None):
        """Send or update the DHCP BOOT options for this node.

        :param task: A TaskManager instance.
        :param options: this will be a list of dicts, e.g.

                        ::

                         [{'opt_name': '67',
                           'opt_value': 'pxelinux.0',
                           'ip_version': 4},
                          {'opt_name': '66',
                           'opt_value': '123.123.123.456',
                           'ip_version': 4}]

        :param vifs: A dict with keys 'ports' and 'portgroups' and
            dicts as values. Each dict has key/value pairs of the form
            <ironic UUID>:<neutron port UUID>. e.g.

                          ::

                           {'ports': {'port.uuid': vif.id},
                            'portgroups': {'portgroup.uuid': vif.id}}

            If the value is None, will get the list of ports/portgroups
            from the Ironic port/portgroup objects.
        :raises: FailedToUpdateDHCPOptOnPort
        """

    def get_ip_addresses(self, task):
        """Get IP addresses for all ports/portgroups in `task`.

        :param task: A TaskManager instance.
        :returns: List of IP addresses associated with
            task's ports and portgroups.
        """
        return []

    def clean_dhcp_opts(self, task):
        """Clean up the DHCP BOOT options for all ports in `task`.

        :param task: A TaskManager instance.

        :raises: FailedToCleanDHCPOpts
        """
        pass

    def supports_ipxe_tag(self):
        """Whether the provider will correctly apply the 'ipxe' tag.

        When iPXE makes a DHCP request, does this provider support adding
        the tag `ipxe` or `ipxe6` (for IPv6). When the provider returns True,
        options can be added which filter on these tags.

        :returns: True when the driver supports tagging iPXE DHCP requests
        """
        return False
