# Copyright 2018 Intel, 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.

from sushy.resources import base
from sushy import utils

from rsd_lib.resources.v2_1.ethernet_switch import ethernet_switch_port \
    as v2_1_port
from rsd_lib.resources.v2_2.ethernet_switch import port_metrics


class Port(v2_1_port.EthernetSwitchPort):

    def _get_metrics_path(self):
        """Helper function to find the Port metrics path"""
        return utils.get_sub_resource_path_by(self, 'Metrics')

    @property
    @utils.cache_it
    def metrics(self):
        """Property to provide reference to `Metrics` instance

        It is calculated once the first time it is queried. On refresh,
        this property is reset.
        """
        return port_metrics.PortMetrics(
            self._conn, self._get_metrics_path(),
            redfish_version=self.redfish_version)


class PortCollection(base.ResourceCollectionBase):

    @property
    def _resource_type(self):
        return Port

    def __init__(self, connector, path, redfish_version=None):
        """A class representing an Port

        :param connector: A Connector instance
        :param path: The canonical path to the Port collection resource
        :param redfish_version: The version of RedFish. Used to construct
            the object according to schema of the given version.
        """
        super(PortCollection, self).__init__(connector, path, redfish_version)