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# Copyright 2022-2024 ETSI OSG/SDG TeraFlowSDN (TFS) (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.

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from prometheus_client import start_http_server
from common.Constants import ServiceNameEnum
from common.Settings import (
ENVVAR_SUFIX_SERVICE_HOST, ENVVAR_SUFIX_SERVICE_PORT_GRPC,
get_env_var_name, get_log_level, get_metrics_port,
wait_for_environment_variables
)
from .DeviceService import DeviceService
from .driver_api.DriverFactory import DriverFactory
from .driver_api.DriverInstanceCache import DriverInstanceCache, preload_drivers
from .drivers import DRIVERS

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terminate = threading.Event()
LOGGER : logging.Logger = None

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

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terminate.set()
def main():
global LOGGER # pylint: disable=global-statement

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logging.basicConfig(level=log_level, format="[%(asctime)s] %(levelname)s:%(name)s:%(message)s")
logging.getLogger('apscheduler.executors.default').setLevel(logging.WARNING)
logging.getLogger('apscheduler.scheduler').setLevel(logging.WARNING)
logging.getLogger('monitoring-client').setLevel(logging.WARNING)
LOGGER = logging.getLogger(__name__)
wait_for_environment_variables([
get_env_var_name(ServiceNameEnum.CONTEXT, ENVVAR_SUFIX_SERVICE_HOST ),
get_env_var_name(ServiceNameEnum.CONTEXT, ENVVAR_SUFIX_SERVICE_PORT_GRPC),

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signal.signal(signal.SIGINT, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)
LOGGER.info('Starting...')

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# Start metrics server

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start_http_server(metrics_port)
# Initialize Driver framework
driver_factory = DriverFactory(DRIVERS)
driver_instance_cache = DriverInstanceCache(driver_factory)

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# Starting device service
grpc_service = DeviceService(driver_instance_cache)
grpc_service.start()

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# Initialize drivers with existing devices in context
LOGGER.info('Pre-loading drivers...')
preload_drivers(driver_instance_cache)

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# Wait for Ctrl+C or termination signal

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

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LOGGER.info('Bye')
return 0

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