#    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 datetime

from ironic_lib import metrics_utils
import pecan
from six.moves import http_client
import wsme
from wsme import types as wtypes

from ironic.api.controllers import base
from ironic.api.controllers import link
from ironic.api.controllers.v1 import collection
from ironic.api.controllers.v1 import port
from ironic.api.controllers.v1 import types
from ironic.api.controllers.v1 import utils as api_utils
from ironic.api import expose
from ironic.common import exception
from ironic.common.i18n import _
from ironic.common import policy
from ironic.common import utils as common_utils
from ironic import objects

METRICS = metrics_utils.get_metrics_logger(__name__)

_DEFAULT_RETURN_FIELDS = ('uuid', 'address', 'name')


class Portgroup(base.APIBase):
    """API representation of a portgroup.

    This class enforces type checking and value constraints, and converts
    between the internal object model and the API representation of a
    portgroup.
    """

    _node_uuid = None

    def _get_node_uuid(self):
        return self._node_uuid

    def _set_node_uuid(self, value):
        if value and self._node_uuid != value:
            if not api_utils.allow_portgroups():
                self._node_uuid = wtypes.Unset
                return
            try:
                node = objects.Node.get(pecan.request.context, value)
                self._node_uuid = node.uuid
                # NOTE: Create the node_id attribute on-the-fly
                #       to satisfy the api -> rpc object
                #       conversion.
                self.node_id = node.id
            except exception.NodeNotFound as e:
                # Change error code because 404 (NotFound) is inappropriate
                # response for a POST request to create a Portgroup
                e.code = http_client.BAD_REQUEST
                raise e
        elif value == wtypes.Unset:
            self._node_uuid = wtypes.Unset

    uuid = types.uuid
    """Unique UUID for this portgroup"""

    address = wsme.wsattr(types.macaddress)
    """MAC Address for this portgroup"""

    extra = {wtypes.text: types.jsontype}
    """This portgroup's meta data"""

    internal_info = wsme.wsattr({wtypes.text: types.jsontype}, readonly=True)
    """This portgroup's internal info"""

    node_uuid = wsme.wsproperty(types.uuid, _get_node_uuid, _set_node_uuid,
                                mandatory=True)
    """The UUID of the node this portgroup belongs to"""

    name = wsme.wsattr(wtypes.text)
    """The logical name for this portgroup"""

    links = wsme.wsattr([link.Link], readonly=True)
    """A list containing a self link and associated portgroup links"""

    standalone_ports_supported = types.boolean
    """Indicates whether ports of this portgroup may be used as
       single NIC ports"""

    mode = wsme.wsattr(wtypes.text)
    """The mode for this portgroup. See linux bonding
    documentation for details:
    https://www.kernel.org/doc/Documentation/networking/bonding.txt"""

    properties = {wtypes.text: types.jsontype}
    """This portgroup's properties"""

    ports = wsme.wsattr([link.Link], readonly=True)
    """Links to the collection of ports of this portgroup"""

    def __init__(self, **kwargs):
        self.fields = []
        fields = list(objects.Portgroup.fields)
        # NOTE: node_uuid is not part of objects.Portgroup.fields
        #       because it's an API-only attribute
        fields.append('node_uuid')
        for field in fields:
            # Skip fields we do not expose.
            if not hasattr(self, field):
                continue
            self.fields.append(field)
            setattr(self, field, kwargs.get(field, wtypes.Unset))

        # NOTE: node_id is an attribute created on-the-fly
        # by _set_node_uuid(), it needs to be present in the fields so
        # that as_dict() will contain node_id field when converting it
        # before saving it in the database.
        self.fields.append('node_id')
        setattr(self, 'node_uuid', kwargs.get('node_id', wtypes.Unset))

    @staticmethod
    def _convert_with_links(portgroup, url, fields=None):
        """Add links to the portgroup."""
        # NOTE(lucasagomes): Since we are able to return a specified set of
        # fields the "uuid" can be unset, so we need to save it in another
        # variable to use when building the links
        portgroup_uuid = portgroup.uuid
        if fields is not None:
            portgroup.unset_fields_except(fields)
        else:
            portgroup.ports = [
                link.Link.make_link('self', url, 'portgroups',
                                    portgroup_uuid + "/ports"),
                link.Link.make_link('bookmark', url, 'portgroups',
                                    portgroup_uuid + "/ports", bookmark=True)
            ]

        # never expose the node_id attribute
        portgroup.node_id = wtypes.Unset

        portgroup.links = [link.Link.make_link('self', url,
                                               'portgroups', portgroup_uuid),
                           link.Link.make_link('bookmark', url,
                                               'portgroups', portgroup_uuid,
                                               bookmark=True)
                           ]
        return portgroup

    @classmethod
    def convert_with_links(cls, rpc_portgroup, fields=None):
        """Add links to the portgroup."""
        portgroup = Portgroup(**rpc_portgroup.as_dict())

        if fields is not None:
            api_utils.check_for_invalid_fields(fields, portgroup.as_dict())

        return cls._convert_with_links(portgroup, pecan.request.host_url,
                                       fields=fields)

    @classmethod
    def sample(cls, expand=True):
        """Return a sample of the portgroup."""
        sample = cls(uuid='a594544a-2daf-420c-8775-17a8c3e0852f',
                     address='fe:54:00:77:07:d9',
                     name='node1-portgroup-01',
                     extra={'foo': 'bar'},
                     internal_info={'baz': 'boo'},
                     standalone_ports_supported=True,
                     mode='active-backup',
                     properties={},
                     created_at=datetime.datetime(2000, 1, 1, 12, 0, 0),
                     updated_at=datetime.datetime(2000, 1, 1, 12, 0, 0))
        # NOTE(lucasagomes): node_uuid getter() method look at the
        # _node_uuid variable
        sample._node_uuid = '7ae81bb3-dec3-4289-8d6c-da80bd8001ae'
        fields = None if expand else _DEFAULT_RETURN_FIELDS
        return cls._convert_with_links(sample, 'http://localhost:6385',
                                       fields=fields)


class PortgroupPatchType(types.JsonPatchType):

    _api_base = Portgroup
    _extra_non_removable_attrs = {'/mode'}

    @staticmethod
    def internal_attrs():
        defaults = types.JsonPatchType.internal_attrs()
        return defaults + ['/internal_info']


class PortgroupCollection(collection.Collection):
    """API representation of a collection of portgroups."""

    portgroups = [Portgroup]
    """A list containing portgroup objects"""

    def __init__(self, **kwargs):
        self._type = 'portgroups'

    @staticmethod
    def convert_with_links(rpc_portgroups, limit, url=None, fields=None,
                           **kwargs):
        collection = PortgroupCollection()
        collection.portgroups = [Portgroup.convert_with_links(p, fields=fields)
                                 for p in rpc_portgroups]
        collection.next = collection.get_next(limit, url=url, **kwargs)
        return collection

    @classmethod
    def sample(cls):
        """Return a sample of the portgroup."""
        sample = cls()
        sample.portgroups = [Portgroup.sample(expand=False)]
        return sample


class PortgroupsController(pecan.rest.RestController):
    """REST controller for portgroups."""

    _custom_actions = {
        'detail': ['GET'],
    }

    invalid_sort_key_list = ['extra', 'internal_info', 'properties']

    _subcontroller_map = {
        'ports': port.PortsController,
    }

    @pecan.expose()
    def _lookup(self, ident, subres, *remainder):
        if not api_utils.allow_portgroups():
            pecan.abort(http_client.NOT_FOUND)
        try:
            ident = types.uuid_or_name.validate(ident)
        except exception.InvalidUuidOrName as e:
            pecan.abort(http_client.BAD_REQUEST, e.args[0])
        subcontroller = self._subcontroller_map.get(subres)
        if subcontroller:
            if api_utils.allow_portgroups_subcontrollers():
                return subcontroller(
                    portgroup_ident=ident,
                    node_ident=self.parent_node_ident), remainder
            pecan.abort(http_client.NOT_FOUND)

    def __init__(self, node_ident=None):
        super(PortgroupsController, self).__init__()
        self.parent_node_ident = node_ident

    def _get_portgroups_collection(self, node_ident, address,
                                   marker, limit, sort_key, sort_dir,
                                   resource_url=None, fields=None):
        """Return portgroups collection.

        :param node_ident: UUID or name of a node.
        :param address: MAC address of a portgroup.
        :param marker: Pagination marker for large data sets.
        :param limit: Maximum number of resources to return in a single result.
        :param sort_key: Column to sort results by. Default: id.
        :param sort_dir: Direction to sort. "asc" or "desc". Default: asc.
        :param resource_url: Optional, URL to the portgroup resource.
        :param fields: Optional, a list with a specified set of fields
                       of the resource to be returned.
        """
        limit = api_utils.validate_limit(limit)
        sort_dir = api_utils.validate_sort_dir(sort_dir)

        marker_obj = None
        if marker:
            marker_obj = objects.Portgroup.get_by_uuid(pecan.request.context,
                                                       marker)

        if sort_key in self.invalid_sort_key_list:
            raise exception.InvalidParameterValue(
                _("The sort_key value %(key)s is an invalid field for "
                  "sorting") % {'key': sort_key})

        node_ident = self.parent_node_ident or node_ident

        if node_ident:
            # FIXME: Since all we need is the node ID, we can
            #        make this more efficient by only querying
            #        for that column. This will get cleaned up
            #        as we move to the object interface.
            node = api_utils.get_rpc_node(node_ident)
            portgroups = objects.Portgroup.list_by_node_id(
                pecan.request.context, node.id, limit,
                marker_obj, sort_key=sort_key, sort_dir=sort_dir)
        elif address:
            portgroups = self._get_portgroups_by_address(address)
        else:
            portgroups = objects.Portgroup.list(pecan.request.context, limit,
                                                marker_obj, sort_key=sort_key,
                                                sort_dir=sort_dir)

        return PortgroupCollection.convert_with_links(portgroups, limit,
                                                      url=resource_url,
                                                      fields=fields,
                                                      sort_key=sort_key,
                                                      sort_dir=sort_dir)

    def _get_portgroups_by_address(self, address):
        """Retrieve a portgroup by its address.

        :param address: MAC address of a portgroup, to get the portgroup
                        which has this MAC address.
        :returns: a list with the portgroup, or an empty list if no portgroup
                  is found.

        """
        try:
            portgroup = objects.Portgroup.get_by_address(pecan.request.context,
                                                         address)
            return [portgroup]
        except exception.PortgroupNotFound:
            return []

    @METRICS.timer('PortgroupsController.get_all')
    @expose.expose(PortgroupCollection, types.uuid_or_name, types.macaddress,
                   types.uuid, int, wtypes.text, wtypes.text, types.listtype)
    def get_all(self, node=None, address=None, marker=None,
                limit=None, sort_key='id', sort_dir='asc', fields=None):
        """Retrieve a list of portgroups.

        :param node: UUID or name of a node, to get only portgroups for that
                     node.
        :param address: MAC address of a portgroup, to get the portgroup which
                        has this MAC address.
        :param marker: pagination marker for large data sets.
        :param limit: maximum number of resources to return in a single result.
                      This value cannot be larger than the value of max_limit
                      in the [api] section of the ironic configuration, or only
                      max_limit resources will be returned.
        :param sort_key: column to sort results by. Default: id.
        :param sort_dir: direction to sort. "asc" or "desc". Default: asc.
        :param fields: Optional, a list with a specified set of fields
                       of the resource to be returned.
        """
        if not api_utils.allow_portgroups():
            raise exception.NotFound()

        cdict = pecan.request.context.to_policy_values()
        policy.authorize('baremetal:portgroup:get', cdict, cdict)

        api_utils.check_allowed_portgroup_fields(fields)

        if fields is None:
            fields = _DEFAULT_RETURN_FIELDS

        return self._get_portgroups_collection(node, address,
                                               marker, limit,
                                               sort_key, sort_dir,
                                               fields=fields)

    @METRICS.timer('PortgroupsController.detail')
    @expose.expose(PortgroupCollection, types.uuid_or_name, types.macaddress,
                   types.uuid, int, wtypes.text, wtypes.text)
    def detail(self, node=None, address=None, marker=None,
               limit=None, sort_key='id', sort_dir='asc'):
        """Retrieve a list of portgroups with detail.

        :param node: UUID or name of a node, to get only portgroups for that
                     node.
        :param address: MAC address of a portgroup, to get the portgroup which
                        has this MAC address.
        :param marker: pagination marker for large data sets.
        :param limit: maximum number of resources to return in a single result.
                      This value cannot be larger than the value of max_limit
                      in the [api] section of the ironic configuration, or only
                      max_limit resources will be returned.
        :param sort_key: column to sort results by. Default: id.
        :param sort_dir: direction to sort. "asc" or "desc". Default: asc.
        """
        if not api_utils.allow_portgroups():
            raise exception.NotFound()

        cdict = pecan.request.context.to_policy_values()
        policy.authorize('baremetal:portgroup:get', cdict, cdict)

        # NOTE: /detail should only work against collections
        parent = pecan.request.path.split('/')[:-1][-1]
        if parent != "portgroups":
            raise exception.HTTPNotFound()

        resource_url = '/'.join(['portgroups', 'detail'])
        return self._get_portgroups_collection(
            node, address, marker, limit, sort_key, sort_dir,
            resource_url=resource_url)

    @METRICS.timer('PortgroupsController.get_one')
    @expose.expose(Portgroup, types.uuid_or_name, types.listtype)
    def get_one(self, portgroup_ident, fields=None):
        """Retrieve information about the given portgroup.

        :param portgroup_ident: UUID or logical name of a portgroup.
        :param fields: Optional, a list with a specified set of fields
                       of the resource to be returned.
        """
        if not api_utils.allow_portgroups():
            raise exception.NotFound()

        cdict = pecan.request.context.to_policy_values()
        policy.authorize('baremetal:portgroup:get', cdict, cdict)

        if self.parent_node_ident:
            raise exception.OperationNotPermitted()

        api_utils.check_allowed_portgroup_fields(fields)

        rpc_portgroup = api_utils.get_rpc_portgroup(portgroup_ident)
        return Portgroup.convert_with_links(rpc_portgroup, fields=fields)

    @METRICS.timer('PortgroupsController.post')
    @expose.expose(Portgroup, body=Portgroup, status_code=http_client.CREATED)
    def post(self, portgroup):
        """Create a new portgroup.

        :param portgroup: a portgroup within the request body.
        """
        if not api_utils.allow_portgroups():
            raise exception.NotFound()

        cdict = pecan.request.context.to_policy_values()
        policy.authorize('baremetal:portgroup:create', cdict, cdict)

        if self.parent_node_ident:
            raise exception.OperationNotPermitted()

        if (not api_utils.allow_portgroup_mode_properties() and
                (portgroup.mode is not wtypes.Unset or
                 portgroup.properties is not wtypes.Unset)):
            raise exception.NotAcceptable()

        if (portgroup.name and
                not api_utils.is_valid_logical_name(portgroup.name)):
            error_msg = _("Cannot create portgroup with invalid name "
                          "'%(name)s'") % {'name': portgroup.name}
            raise wsme.exc.ClientSideError(
                error_msg, status_code=http_client.BAD_REQUEST)

        pg_dict = portgroup.as_dict()
        vif = pg_dict.get('extra', {}).get('vif_port_id')
        if vif:
            common_utils.warn_about_deprecated_extra_vif_port_id()

        new_portgroup = objects.Portgroup(pecan.request.context,
                                          **pg_dict)
        new_portgroup.create()
        # Set the HTTP Location Header
        pecan.response.location = link.build_url('portgroups',
                                                 new_portgroup.uuid)
        return Portgroup.convert_with_links(new_portgroup)

    @METRICS.timer('PortgroupsController.patch')
    @wsme.validate(types.uuid_or_name, [PortgroupPatchType])
    @expose.expose(Portgroup, types.uuid_or_name, body=[PortgroupPatchType])
    def patch(self, portgroup_ident, patch):
        """Update an existing portgroup.

        :param portgroup_ident: UUID or logical name of a portgroup.
        :param patch: a json PATCH document to apply to this portgroup.
        """
        if not api_utils.allow_portgroups():
            raise exception.NotFound()

        cdict = pecan.request.context.to_policy_values()
        policy.authorize('baremetal:portgroup:update', cdict, cdict)

        if self.parent_node_ident:
            raise exception.OperationNotPermitted()

        if (not api_utils.allow_portgroup_mode_properties() and
                (api_utils.is_path_updated(patch, '/mode') or
                 api_utils.is_path_updated(patch, '/properties'))):
            raise exception.NotAcceptable()

        rpc_portgroup = api_utils.get_rpc_portgroup(portgroup_ident)

        names = api_utils.get_patch_values(patch, '/name')
        for name in names:
            if (name and
                    not api_utils.is_valid_logical_name(name)):
                error_msg = _("Portgroup %(portgroup)s: Cannot change name to"
                              " invalid name '%(name)s'") % {'portgroup':
                                                             portgroup_ident,
                                                             'name': name}
                raise wsme.exc.ClientSideError(
                    error_msg, status_code=http_client.BAD_REQUEST)

        try:
            portgroup_dict = rpc_portgroup.as_dict()
            # NOTE:
            # 1) Remove node_id because it's an internal value and
            #    not present in the API object
            # 2) Add node_uuid
            portgroup_dict['node_uuid'] = portgroup_dict.pop('node_id', None)
            portgroup = Portgroup(**api_utils.apply_jsonpatch(portgroup_dict,
                                                              patch))
        except api_utils.JSONPATCH_EXCEPTIONS as e:
            raise exception.PatchError(patch=patch, reason=e)

        # Update only the fields that have changed
        for field in objects.Portgroup.fields:
            try:
                patch_val = getattr(portgroup, field)
            except AttributeError:
                # Ignore fields that aren't exposed in the API
                continue
            if patch_val == wtypes.Unset:
                patch_val = None
            if rpc_portgroup[field] != patch_val:
                rpc_portgroup[field] = patch_val

        rpc_node = objects.Node.get_by_id(pecan.request.context,
                                          rpc_portgroup.node_id)
        topic = pecan.request.rpcapi.get_topic_for(rpc_node)

        new_portgroup = pecan.request.rpcapi.update_portgroup(
            pecan.request.context, rpc_portgroup, topic)

        return Portgroup.convert_with_links(new_portgroup)

    @METRICS.timer('PortgroupsController.delete')
    @expose.expose(None, types.uuid_or_name,
                   status_code=http_client.NO_CONTENT)
    def delete(self, portgroup_ident):
        """Delete a portgroup.

        :param portgroup_ident: UUID or logical name of a portgroup.
        """
        if not api_utils.allow_portgroups():
            raise exception.NotFound()

        cdict = pecan.request.context.to_policy_values()
        policy.authorize('baremetal:portgroup:delete', cdict, cdict)

        if self.parent_node_ident:
            raise exception.OperationNotPermitted()

        rpc_portgroup = api_utils.get_rpc_portgroup(portgroup_ident)
        rpc_node = objects.Node.get_by_id(pecan.request.context,
                                          rpc_portgroup.node_id)
        topic = pecan.request.rpcapi.get_topic_for(rpc_node)
        pecan.request.rpcapi.destroy_portgroup(pecan.request.context,
                                               rpc_portgroup, topic)
