# 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 signal
import sys
import logging, threading
from .TelemetryFrontendService import TelemetryFrontendService
from monitoring.service.NameMapping import NameMapping
from monitoring.service.EventTools import EventsDeviceCollector
from common.Settings import (
    get_log_level, wait_for_environment_variables, get_env_var_name, 
    get_metrics_port )

terminate = threading.Event()
LOGGER = None

def signal_handler(signal, frame): # pylint: disable=redefined-outer-name
    LOGGER.warning('Terminate signal received')
    terminate.set()

def main():
    global LOGGER

    log_level = get_log_level()
    logging.basicConfig(level=log_level, format="[%(asctime)s] %(levelname)s:%(name)s:%(message)s")
    LOGGER = logging.getLogger(__name__)

# ------- will be added later --------------
    # wait_for_environment_variables([
    #     get_env_var_name


    # ])
# ------- will be added later --------------

    signal.signal(signal.SIGINT,  signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)

    LOGGER.info('Starting...')

    # Start metrics server
    metrics_port = get_metrics_port()
    start_http_server(metrics_port)

    name_mapping = NameMapping()

    grpc_service = TelemetryFrontendService(name_mapping)
    grpc_service.start()

    # Wait for Ctrl+C or termination signal
    while not terminate.wait(timeout=1.0): pass

    LOGGER.info('Terminating...')
    grpc_service.stop()

    LOGGER.info('Bye')
    return 0

if __name__ == '__main__':
    sys.exit(main())