# Copyright 2022-2024 ETSI OSG/SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
#
# 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 logging
from typing import Dict, List, Optional

import requests
from requests.auth import HTTPBasicAuth

from device.service.driver_api.ImportTopologyEnum import ImportTopologyEnum

GET_DEVICES_URL = "{:s}://{:s}:{:d}/tfs-api/devices"
GET_LINKS_URL = "{:s}://{:s}:{:d}/tfs-api/links"
L3VPN_URL = "{:s}://{:s}:{:d}/restconf/data/ietf-l3vpn-svc:l3vpn-svc/vpn-services"
TIMEOUT = 30

HTTP_OK_CODES = {
    200,  # OK
    201,  # Created
    202,  # Accepted
    204,  # No Content
}

MAPPING_STATUS = {
    "DEVICEOPERATIONALSTATUS_UNDEFINED": 0,
    "DEVICEOPERATIONALSTATUS_DISABLED": 1,
    "DEVICEOPERATIONALSTATUS_ENABLED": 2,
}

MAPPING_DRIVER = {
    "DEVICEDRIVER_UNDEFINED": 0,
    "DEVICEDRIVER_OPENCONFIG": 1,
    "DEVICEDRIVER_TRANSPORT_API": 2,
    "DEVICEDRIVER_P4": 3,
    "DEVICEDRIVER_IETF_NETWORK_TOPOLOGY": 4,
    "DEVICEDRIVER_ONF_TR_532": 5,
    "DEVICEDRIVER_XR": 6,
    "DEVICEDRIVER_IETF_L2VPN": 7,
    "DEVICEDRIVER_GNMI_OPENCONFIG": 8,
    "DEVICEDRIVER_OPTICAL_TFS": 9,
    "DEVICEDRIVER_IETF_ACTN": 10,
    "DEVICEDRIVER_OC": 11,
}

MSG_ERROR = "Could not retrieve devices in remote TeraFlowSDN instance({:s}). status_code={:s} reply={:s}"

LOGGER = logging.getLogger(__name__)


class TfsApiClient:
    def __init__(
        self,
        address: str,
        port: int,
        scheme: str = "http",
        username: Optional[str] = None,
        password: Optional[str] = None,
    ) -> None:
        self._devices_url = GET_DEVICES_URL.format(scheme, address, port)
        self._links_url = GET_LINKS_URL.format(scheme, address, port)
        self._l3vpn_url = L3VPN_URL.format(scheme, address, port)
        self._auth = None
        # (
        #     HTTPBasicAuth(username, password)
        #     if username is not None and password is not None
        #     else None
        # )

    def get_devices_endpoints(
        self, import_topology: ImportTopologyEnum = ImportTopologyEnum.DEVICES
    ) -> List[Dict]:
        LOGGER.debug("[get_devices_endpoints] begin")
        LOGGER.debug(
            "[get_devices_endpoints] import_topology={:s}".format(str(import_topology))
        )

        reply = requests.get(self._devices_url, timeout=TIMEOUT, auth=self._auth)
        if reply.status_code not in HTTP_OK_CODES:
            msg = MSG_ERROR.format(
                str(self._devices_url), str(reply.status_code), str(reply)
            )
            LOGGER.error(msg)
            raise Exception(msg)

        if import_topology == ImportTopologyEnum.DISABLED:
            raise Exception(
                "Unsupported import_topology mode: {:s}".format(str(import_topology))
            )

        result = list()
        for json_device in reply.json()["devices"]:
            device_uuid: str = json_device["device_id"]["device_uuid"]["uuid"]
            device_type: str = json_device["device_type"]
            device_status = json_device["device_operational_status"]
            device_url = "/devices/device[{:s}]".format(device_uuid)
            device_data = {
                "uuid": json_device["device_id"]["device_uuid"]["uuid"],
                "name": json_device["name"],
                "type": device_type,
                "status": MAPPING_STATUS[device_status],
                "drivers": [
                    MAPPING_DRIVER[driver] for driver in json_device["device_drivers"]
                ],
            }
            result.append((device_url, device_data))

            for json_endpoint in json_device["device_endpoints"]:
                endpoint_uuid = json_endpoint["endpoint_id"]["endpoint_uuid"]["uuid"]
                endpoint_url = "/endpoints/endpoint[{:s}]".format(endpoint_uuid)
                endpoint_data = {
                    "device_uuid": device_uuid,
                    "uuid": endpoint_uuid,
                    "name": json_endpoint["name"],
                    "type": json_endpoint["endpoint_type"],
                }
                result.append((endpoint_url, endpoint_data))

        if import_topology == ImportTopologyEnum.DEVICES:
            LOGGER.debug("[get_devices_endpoints] devices only; returning")
            return result

        reply = requests.get(self._links_url, timeout=TIMEOUT, auth=self._auth)
        if reply.status_code not in HTTP_OK_CODES:
            msg = MSG_ERROR.format(
                str(self._links_url), str(reply.status_code), str(reply)
            )
            LOGGER.error(msg)
            raise Exception(msg)

        for json_link in reply.json()["links"]:
            link_uuid: str = json_link["link_id"]["link_uuid"]["uuid"]
            link_url = "/links/link[{:s}]".format(link_uuid)
            link_endpoint_ids = [
                (
                    json_endpoint_id["device_id"]["device_uuid"]["uuid"],
                    json_endpoint_id["endpoint_uuid"]["uuid"],
                )
                for json_endpoint_id in json_link["link_endpoint_ids"]
            ]
            link_data = {
                "uuid": json_link["link_id"]["link_uuid"]["uuid"],
                "name": json_link["name"],
                "endpoints": link_endpoint_ids,
            }
            result.append((link_url, link_data))

        LOGGER.debug("[get_devices_endpoints] topology; returning")
        return result

    def create_connectivity_service(self, l3vpn_data: dict) -> None:
        try:
            # requests.post(self._l3vpn_url, json=l3vpn_data)
            LOGGER.debug(
                "[create_connectivity_service] l3vpn_data={:s}".format(str(l3vpn_data))
            )
        except requests.exceptions.ConnectionError:
            raise Exception("faild to send post request to TFS L3VPN NBI")

    def update_connectivity_service(self, l3vpn_data: dict) -> None:
        try:
            # requests.post(self._l3vpn_url, json=l3vpn_data)
            LOGGER.debug(
                "[update_connectivity_service] l3vpn_data={:s}".format(str(l3vpn_data))
            )
        except requests.exceptions.ConnectionError:
            raise Exception("faild to send post request to TFS L3VPN NBI")

    def delete_connectivity_service(self, service_uuid: str) -> None:
        url = self._l3vpn_url + f"/vpn-service={service_uuid}"
        try:
            # requests.delete(url, auth=self._auth)
            LOGGER.debug("[delete_connectivity_service] url={:s}".format(str(url)))
        except requests.exceptions.ConnectionError:
            raise Exception("faild to send delete request to TFS L3VPN NBI")