# 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 logging, sqlalchemy, sqlalchemy_utils
# from common.Settings import get_setting

LOGGER = logging.getLogger(__name__)

APP_NAME = 'tfs'
ECHO = False                # False: No dump SQL commands and transactions executed
CRDB_URI_TEMPLATE = 'cockroachdb://{:s}:{:s}@127.0.0.1:{:s}/{:s}?sslmode={:s}'
# CRDB_URI_TEMPLATE = 'cockroachdb://{:s}:{:s}@cockroachdb-public.{:s}.svc.cluster.local:{:s}/{:s}?sslmode={:s}'

class TelemetryEngine:
    # def __init__(self):
    #     self.engine = self.get_engine()
    @staticmethod
    def get_engine() -> sqlalchemy.engine.Engine:
        CRDB_NAMESPACE = "crdb"
        CRDB_SQL_PORT  = "26257"
        CRDB_DATABASE  = "telemetryfrontend"
        CRDB_USERNAME  = "tfs"
        CRDB_PASSWORD  = "tfs123"
        CRDB_SSLMODE   = "require"
        crdb_uri = CRDB_URI_TEMPLATE.format(
                CRDB_USERNAME, CRDB_PASSWORD, CRDB_SQL_PORT, CRDB_DATABASE, CRDB_SSLMODE)
        # crdb_uri = CRDB_URI_TEMPLATE.format(
        #         CRDB_USERNAME, CRDB_PASSWORD, CRDB_NAMESPACE, CRDB_SQL_PORT, CRDB_DATABASE, CRDB_SSLMODE)
        try:
            # engine = sqlalchemy.create_engine(
            #     crdb_uri, connect_args={'application_name': APP_NAME}, echo=ECHO, future=True)
            engine = sqlalchemy.create_engine(crdb_uri, echo=False)
            LOGGER.info(' TelemetryDBmanager initalized with DB URL: {:}'.format(crdb_uri))
        except: # pylint: disable=bare-except # pragma: no cover
            LOGGER.exception('Failed to connect to database: {:s}'.format(str(crdb_uri)))
            return None # type: ignore
        return engine # type: ignore

    @staticmethod
    def create_database(engine : sqlalchemy.engine.Engine) -> None:
        if not sqlalchemy_utils.database_exists(engine.url):
            LOGGER.info("Database created. {:}".format(engine.url))
            sqlalchemy_utils.create_database(engine.url)

    @staticmethod
    def drop_database(engine : sqlalchemy.engine.Engine) -> None:
        if sqlalchemy_utils.database_exists(engine.url):
            sqlalchemy_utils.drop_database(engine.url)