# -*- coding: utf-8 -*-

# 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 asyncio
import aiohttp
from http import HTTPStatus
from urllib.parse import quote
from osm_nbi.base_topic import EngineException

__author__ = "Vijay R S <vijay.r@tataelxsi.co.in>"


class PmJobsTopic:
    def __init__(self, db, host=None, port=None):
        self.db = db
        self.url = "http://{}:{}".format(host, port)
        self.nfvi_metric_list = [
            "cpu_utilization",
            "average_memory_utilization",
            "disk_read_ops",
            "disk_write_ops",
            "disk_read_bytes",
            "disk_write_bytes",
            "packets_dropped",
            "packets_sent",
            "packets_received",
        ]

    def _get_vnf_metric_list(self, ns_id):
        metric_list = self.nfvi_metric_list.copy()
        vnfr_desc = self.db.get_list("vnfrs", {"nsr-id-ref": ns_id})
        if not vnfr_desc:
            raise EngineException(
                "NS not found with id {}".format(ns_id), http_code=HTTPStatus.NOT_FOUND
            )
        else:
            for vnfr in vnfr_desc:
                vnfd_desc = self.db.get_one(
                    "vnfds",
                    {"_id": vnfr["vnfd-id"]},
                    fail_on_empty=True,
                    fail_on_more=False,
                )
                try:
                    configs = vnfd_desc.get("df")[0]["lcm-operations-configuration"][
                        "operate-vnf-op-config"
                    ]["day1-2"]
                except Exception:
                    configs = []

                for config in configs:
                    if "metrics" in config:
                        metric_list.extend(
                            [quote(metric["name"]) for metric in config["metrics"]]
                        )
        metric_list = list(set(metric_list))
        return metric_list

    async def _prom_metric_request(self, ns_id, metrics_list):
        try:
            async with aiohttp.ClientSession() as session:
                data = []
                for metlist in metrics_list:
                    request_url = (
                        self.url
                        + "/api/v1/query?query=osm_"
                        + metlist
                        + "{ns_id='"
                        + ns_id
                        + "'}"
                    )
                    async with session.get(request_url) as resp:
                        resp = await resp.json()
                        resp = resp["data"]["result"]
                        if resp:
                            data.append(resp)
                return data
        except aiohttp.client_exceptions.ClientConnectorError as e:
            raise EngineException("Connection to '{}'Failure: {}".format(self.url, e))

    def show(self, session, ns_id, filter_q=None, api_req=False):
        metrics_list = self._get_vnf_metric_list(ns_id)
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
        prom_metric = loop.run_until_complete(
            self._prom_metric_request(ns_id, metrics_list)
        )
        metric = {}
        metric_temp = []
        for index_list in prom_metric:
            for index in index_list:
                process_metric = {"performanceValue": {"performanceValue": {}}}
                process_metric["objectInstanceId"] = index["metric"]["ns_id"]
                process_metric["performanceMetric"] = index["metric"]["__name__"]
                process_metric["performanceValue"]["timestamp"] = index["value"][0]
                process_metric["performanceValue"]["performanceValue"][
                    "performanceValue"
                ] = index["value"][1]
                process_metric["performanceValue"]["performanceValue"][
                    "vnfMemberIndex"
                ] = index["metric"]["vnf_member_index"]
                if "vdu_name" not in index["metric"]:
                    pass
                else:
                    process_metric["performanceValue"]["performanceValue"][
                        "vduName"
                    ] = index["metric"]["vdu_name"]
                metric_temp.append(process_metric)
        metric["entries"] = metric_temp
        return metric