# 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.

import json, logging
from sqlalchemy.dialects.postgresql import insert
from common.message_broker.MessageBroker import MessageBroker
from sqlalchemy.engine import Engine
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy_cockroachdb import run_transaction
from common.proto.context_pb2 import OpticalConfig, OpticalConfigId , Empty , EventTypeEnum
from .models.OpticalConfigModel import OpticalConfigModel , OpticalChannelModel
from context.service.database.uuids.OpticalConfig import channel_get_uuid
from .Events import notify_event_opticalconfig

LOGGER = logging.getLogger(__name__)

def get_opticalconfig(db_engine : Engine):
    def callback(session:Session):
        optical_configs = list()
        results = session.query(OpticalConfigModel).all()
        
        for obj in results:
           
     
            optical_config = OpticalConfig()
            optical_config.config = json.dumps(obj.dump())
            optical_config.opticalconfig_id.opticalconfig_uuid = obj.dump_id()["opticalconfig_uuid"]
            optical_configs.append(optical_config)
        return optical_configs
    obj = run_transaction(sessionmaker(bind=db_engine), callback)
    return obj

def set_opticalconfig(db_engine : Engine, request : OpticalConfig):
   
    opticalconfig_id = OpticalConfigId()
    opticalconfig_id.opticalconfig_uuid = request.opticalconfig_id.opticalconfig_uuid
    OpticalConfig_data = []
    if request.config:
        channels = []
        transceivers = []
        config = json.loads(request.config)
                 
        if 'transceivers' in config and len(config['transceivers']['transceiver']) > 0:
            transceivers = [transceiver for transceiver in config['transceivers']['transceiver']]
            
        if 'channels' in config and len(config['channels']) > 0:
            #channels = [channel['name']['index'] for channel in config['channels']]
            for channel_params in config['channels']:
                 channels.append(
                                {
                                    "channel_uuid":channel_get_uuid(channel_params['name']['index']),
                                    "opticalconfig_uuid": request.opticalconfig_id.opticalconfig_uuid,
                                    "channel_name"          : channel_params['name']['index'],
                                    "frequency"         : int(channel_params["frequency"]) if "frequency" in channel_params  else 0,
                                    "operational_mode"  : int(channel_params["operational-mode"]) if "operational-mode" in channel_params else 0,
                                    "target_output_power"      : channel_params["target-output-power"] if "target-output-power" in channel_params else '',
                                 } 
                             )
                  
        OpticalConfig_data.append(
           {
                                    "opticalconfig_uuid": request.opticalconfig_id.opticalconfig_uuid,
                                    "transcievers"      : transceivers,
                                    "interfaces"        :"",
                                    "channel_namespace" : config.get("channel_namespace",None),
                                    "endpoints"         : [json.dumps(endpoint) for endpoint in config.get("endpoints",[])],}
                                   
        )
            
       

    def callback(session:Session)->bool:
        stmt = insert(OpticalConfigModel).values(OpticalConfig_data)
        
        stmt = stmt.on_conflict_do_update(
            index_elements=[OpticalConfigModel.opticalconfig_uuid],
            set_=dict(
                channel_namespace=stmt.excluded.channel_namespace
            )
        )
        stmt = stmt.returning(OpticalConfigModel.opticalconfig_uuid)
        opticalconfig_id = session.execute(stmt).fetchone()
        if (len(channels)>0) :
            
                stmt = insert(OpticalChannelModel).values(channels)
        
                stmt = stmt.on_conflict_do_update(
                    index_elements=[OpticalChannelModel.channel_uuid , OpticalConfigModel.opticalconfig_uuid],
                    set_=dict(
                        channel_name= stmt.excluded.channel_name ,
                        frequency = stmt.excluded.frequency,
                        operational_mode=stmt.excluded.operational_mode,
                      target_output_power=stmt.excluded.target_output_power,
                        
                    )
                    
                )
                stmt = stmt.returning(OpticalChannelModel.channel_uuid)
                opticalChannel_id = session.execute(stmt).fetchone()
                
    opticalconfig_id = run_transaction(sessionmaker(bind=db_engine), callback)
    return {'opticalconfig_uuid': opticalconfig_id}

def select_opticalconfig(db_engine:Engine,request:OpticalConfigId):
    def callback(session : Session) -> OpticalConfig:
        result = OpticalConfig()
        stmt = session.query(OpticalConfigModel)
        stmt = stmt.filter_by(opticalconfig_uuid=request.opticalconfig_uuid)
        obj = stmt.first()
        if obj is not None:
            result.config = json.dumps(obj.dump())
            result.opticalconfig_id.opticalconfig_uuid = obj.opticalconfig_uuid
        return result
    return run_transaction(sessionmaker(bind=db_engine, expire_on_commit=False), callback)


def delete_opticalconfig(db_engine : Engine ,messagebroker : MessageBroker,  request : OpticalConfigId):
    opticalconfig_uuid = request.opticalconfig_uuid
    def callback(session : Session):
        query = session.query(OpticalConfigModel)
      
        num_deleted = session.query(OpticalConfigModel).filter_by(opticalconfig_uuid=opticalconfig_uuid).delete()
        return num_deleted > 0
    deleted = run_transaction(sessionmaker(bind=db_engine), callback)
    
    if deleted:
            notify_event_opticalconfig(messagebroker,  EventTypeEnum.EVENTTYPE_REMOVE, opticalconfig_uuid)
        

   

    return Empty()