# Copyright 2022-2023 ETSI TeraFlowSDN - TFS OSG (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.

from sqlalchemy import Column, DateTime, Enum, ForeignKey, String
from sqlalchemy.dialects.postgresql import ARRAY, UUID
from sqlalchemy.orm import relationship
from typing import Dict
from .enums.KpiSampleType import ORM_KpiSampleTypeEnum
from ._Base import _Base
import json

class EndPointModel(_Base):
    __tablename__ = 'endpoint'

    endpoint_uuid     = Column(UUID(as_uuid=False), primary_key=True)
    device_uuid       = Column(ForeignKey('device.device_uuid',     ondelete='CASCADE' ), nullable=False, index=True)
    topology_uuid     = Column(ForeignKey('topology.topology_uuid', ondelete='RESTRICT'), nullable=False, index=True)
    name              = Column(String, nullable=False)
    endpoint_type     = Column(String, nullable=False)
    kpi_sample_types  = Column(ARRAY(Enum(ORM_KpiSampleTypeEnum), dimensions=1))
    created_at        = Column(DateTime, nullable=False)
    updated_at        = Column(DateTime, nullable=False)
    endpoint_location = Column(String, nullable=True)

    device            = relationship('DeviceModel',          back_populates='endpoints') # lazy='selectin'
    topology          = relationship('TopologyModel', lazy='selectin')
    #link_endpoints    = relationship('LinkEndPointModel',    back_populates='endpoint' )
    #service_endpoints = relationship('ServiceEndPointModel', back_populates='endpoint' )

    def dump_id(self) -> Dict:
        result = {
            'topology_id'  : self.topology.dump_id(),
            'device_id'    : self.device.dump_id(),
            'endpoint_uuid': {'uuid': self.endpoint_uuid},
        }
        return result

    def dump(self) -> Dict:
        return {
            'endpoint_id'      : self.dump_id(),
            'name'             : self.name,
            'endpoint_type'    : self.endpoint_type,
            'kpi_sample_types' : [kst.value for kst in self.kpi_sample_types],
            'endpoint_location': json.loads(self.endpoint_location)
        }

    def dump_name(self) -> Dict:
        return {
            'endpoint_id'  : self.dump_id(),
            'device_name'  : self.device.device_name,
            'endpoint_name': self.name,
            'endpoint_type': self.endpoint_type,
        }