
# Copyright 2017-present Open Networking Foundation
#
# 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
import time
import os
import sys
from synchronizers.new_base.eventstep import EventStep
from synchronizers.new_base.modelaccessor import VOLTService, ONUDevice, Service, model_accessor

# from xos.exceptions import XOSValidationError

class ONUEventStep(EventStep):
    topics = ["onu.events"]
    technology = "kafka"

    max_onu_retry = 50

    def __init__(self, *args, **kwargs):
        super(ONUEventStep, self).__init__(*args, **kwargs)

    def get_oss_service(self, onu_serial_number, retry=0):
        try:
            onu = ONUDevice.objects.get(serial_number=onu_serial_number)
        except IndexError as e:
            self.log.info("onu.events: get_oss_service", retry=retry, max_onu_retry=self.max_onu_retry)
            if retry < self.max_onu_retry:
                self.log.info("onu.events: No ONUDevice with serial_number %s is present in XOS, keep trying" % onu_serial_number)
                time.sleep(10)
                return self.get_oss_service(onu_serial_number, retry + 1)
            else:
                raise Exception("onu.events: No ONUDevice with serial_number %s is present in XOS" % onu_serial_number)

        volt_service = onu.pon_port.olt_device.volt_service
        service = Service.objects.get(id=volt_service.id)
        osses = [s for s in service.subscriber_services if s.kind.lower() == "oss"]

        if len(osses) > 1:
            self.log.warn("onu.events: More than one OSS found for %s" % volt_service.name)
        try:
            return osses[0].leaf_model
        except IndexError as e:
            return None

    def handle_onu_activate_event(self, event):
        oss = self.get_oss_service(event["serial_number"])

        if not oss:
            self.log.info("onu.events: Not processing events as no OSS service is present (is it a provider of vOLT?")
        else:
            try:
                self.log.info("onu.events: Calling OSS for ONUDevice with serial_number %s" % event["serial_number"])
                oss.validate_onu(event)
            except Exception, e:
                self.log.exception("onu.events: Failing to validate ONU in OSS Service %s" % oss.name, onu_serial_number=event["serial_number"])
                raise e

    def process_event(self, event):
        value = json.loads(event.value)
        self.log.info("onu.events: received event", value=value)

        if value["status"] == "activated":
            self.log.info("onu.events: activate onu", value=value)
            self.handle_onu_activate_event(value)