# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# 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 functools, logging
from enum import Enum
from typing import Dict, List
from common.orm.Database import Database
from common.orm.backend.Tools import key_to_str
from common.orm.fields.EnumeratedField import EnumeratedField
from common.orm.fields.ForeignKeyField import ForeignKeyField
from common.orm.fields.PrimaryKeyField import PrimaryKeyField
from common.orm.fields.StringField import StringField
from common.orm.model.Model import Model
from common.proto.context_pb2 import DeviceDriverEnum, DeviceOperationalStatusEnum
from .ConfigModel import ConfigModel
from .Tools import grpc_to_enum

LOGGER = logging.getLogger(__name__)

class ORM_DeviceDriverEnum(Enum):
    UNDEFINED             = DeviceDriverEnum.DEVICEDRIVER_UNDEFINED
    OPENCONFIG            = DeviceDriverEnum.DEVICEDRIVER_OPENCONFIG
    TRANSPORT_API         = DeviceDriverEnum.DEVICEDRIVER_TRANSPORT_API
    P4                    = DeviceDriverEnum.DEVICEDRIVER_P4
    IETF_NETWORK_TOPOLOGY = DeviceDriverEnum.DEVICEDRIVER_IETF_NETWORK_TOPOLOGY
    ONF_TR_352            = DeviceDriverEnum.DEVICEDRIVER_ONF_TR_352
    XR                    = DeviceDriverEnum.DEVICEDRIVER_XR

grpc_to_enum__device_driver = functools.partial(
    grpc_to_enum, DeviceDriverEnum, ORM_DeviceDriverEnum)

class ORM_DeviceOperationalStatusEnum(Enum):
    UNDEFINED = DeviceOperationalStatusEnum.DEVICEOPERATIONALSTATUS_UNDEFINED
    DISABLED  = DeviceOperationalStatusEnum.DEVICEOPERATIONALSTATUS_DISABLED
    ENABLED   = DeviceOperationalStatusEnum.DEVICEOPERATIONALSTATUS_ENABLED

grpc_to_enum__device_operational_status = functools.partial(
    grpc_to_enum, DeviceOperationalStatusEnum, ORM_DeviceOperationalStatusEnum)

class DeviceModel(Model):
    pk = PrimaryKeyField()
    device_uuid = StringField(required=True, allow_empty=False)
    device_type = StringField()
    device_config_fk = ForeignKeyField(ConfigModel)
    device_operational_status = EnumeratedField(ORM_DeviceOperationalStatusEnum, required=True)

    def delete(self) -> None:
        # pylint: disable=import-outside-toplevel
        from .EndPointModel import EndPointModel
        from .RelationModels import TopologyDeviceModel

        for db_endpoint_pk,_ in self.references(EndPointModel):
            EndPointModel(self.database, db_endpoint_pk).delete()

        for db_topology_device_pk,_ in self.references(TopologyDeviceModel):
            TopologyDeviceModel(self.database, db_topology_device_pk).delete()

        for db_driver_pk,_ in self.references(DriverModel):
            DriverModel(self.database, db_driver_pk).delete()

        super().delete()

        ConfigModel(self.database, self.device_config_fk).delete()

    def dump_id(self) -> Dict:
        return {'device_uuid': {'uuid': self.device_uuid}}

    def dump_config(self) -> Dict:
        return ConfigModel(self.database, self.device_config_fk).dump()

    def dump_drivers(self) -> List[int]:
        db_driver_pks = self.references(DriverModel)
        return [DriverModel(self.database, pk).dump() for pk,_ in db_driver_pks]

    def dump_endpoints(self) -> List[Dict]:
        from .EndPointModel import EndPointModel # pylint: disable=import-outside-toplevel
        db_endpoints_pks = self.references(EndPointModel)
        return [EndPointModel(self.database, pk).dump() for pk,_ in db_endpoints_pks]

    def dump(   # pylint: disable=arguments-differ
            self, include_config_rules=True, include_drivers=True, include_endpoints=True
        ) -> Dict:
        result = {
            'device_id': self.dump_id(),
            'device_type': self.device_type,
            'device_operational_status': self.device_operational_status.value,
        }
        if include_config_rules: result.setdefault('device_config', {})['config_rules'] = self.dump_config()
        if include_drivers: result['device_drivers'] = self.dump_drivers()
        if include_endpoints: result['device_endpoints'] = self.dump_endpoints()
        return result

class DriverModel(Model): # pylint: disable=abstract-method
    pk = PrimaryKeyField()
    device_fk = ForeignKeyField(DeviceModel)
    driver = EnumeratedField(ORM_DeviceDriverEnum, required=True)

    def dump(self) -> Dict:
        return self.driver.value

def set_drivers(database : Database, db_device : DeviceModel, grpc_device_drivers):
    db_device_pk = db_device.pk
    for driver in grpc_device_drivers:
        orm_driver = grpc_to_enum__device_driver(driver)
        str_device_driver_key = key_to_str([db_device_pk, orm_driver.name])
        db_device_driver = DriverModel(database, str_device_driver_key)
        db_device_driver.device_fk = db_device
        db_device_driver.driver = orm_driver
        db_device_driver.save()
