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# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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
import sqlite3
from contextlib import closing
from typing import Any, Dict, Optional

from flask import current_app as app
from flask_appbuilder.security.sqla.models import User
from flask_babel import gettext as _
from func_timeout import func_timeout, FunctionTimedOut
from sqlalchemy.engine.url import make_url
from sqlalchemy.exc import DBAPIError, NoSuchModuleError

from superset.commands.base import BaseCommand
from superset.databases.commands.exceptions import (
    DatabaseSecurityUnsafeError,
    DatabaseTestConnectionDriverError,
    DatabaseTestConnectionFailedError,
    DatabaseTestConnectionUnexpectedError,
)
from superset.databases.dao import DatabaseDAO
from superset.errors import ErrorLevel, SupersetErrorType
from superset.exceptions import SupersetSecurityException, SupersetTimeoutException
from superset.extensions import event_logger
from superset.models.core import Database

logger = logging.getLogger(__name__)


class TestConnectionDatabaseCommand(BaseCommand):
    def __init__(self, user: User, data: Dict[str, Any]):
        self._actor = user
        self._properties = data.copy()
        self._model: Optional[Database] = None

    def run(self) -> None:
        self.validate()
        uri = self._properties.get("sqlalchemy_uri", "")
        if self._model and uri == self._model.safe_sqlalchemy_uri():
            uri = self._model.sqlalchemy_uri_decrypted

        # context for error messages
        url = make_url(uri)
        context = {
            "hostname": url.host,
            "password": url.password,
            "port": url.port,
            "username": url.username,
            "database": url.database,
        }

        try:
            database = DatabaseDAO.build_db_for_connection_test(
                server_cert=self._properties.get("server_cert", ""),
                extra=self._properties.get("extra", "{}"),
                impersonate_user=self._properties.get("impersonate_user", False),
                encrypted_extra=self._properties.get("encrypted_extra", "{}"),
            )

            database.set_sqlalchemy_uri(uri)
            database.db_engine_spec.mutate_db_for_connection_test(database)
            username = self._actor.username if self._actor is not None else None
            engine = database.get_sqla_engine(user_name=username)
            event_logger.log_with_context(
                action="test_connection_attempt",
                engine=database.db_engine_spec.__name__,
            )
            with closing(engine.raw_connection()) as conn:
                try:
                    alive = func_timeout(
                        int(
                            app.config[
                                "TEST_DATABASE_CONNECTION_TIMEOUT"
                            ].total_seconds()
                        ),
                        engine.dialect.do_ping,
                        args=(conn,),
                    )
                except sqlite3.ProgrammingError:
                    # SQLite can't run on a separate thread, so ``func_timeout`` fails
                    alive = engine.dialect.do_ping(conn)
                except FunctionTimedOut as ex:
                    raise SupersetTimeoutException(
                        error_type=SupersetErrorType.CONNECTION_DATABASE_TIMEOUT,
                        message=(
                            "Please check your connection details and database settings, "
                            "and ensure that your database is accepting connections, "
                            "then try connecting again."
                        ),
                        level=ErrorLevel.ERROR,
                        extra={"sqlalchemy_uri": database.sqlalchemy_uri},
                    ) from ex
                except Exception:  # pylint: disable=broad-except
                    alive = False
                if not alive:
                    raise DBAPIError(None, None, None)

            # Log succesful connection test with engine
            event_logger.log_with_context(
                action="test_connection_success",
                engine=database.db_engine_spec.__name__,
            )

        except (NoSuchModuleError, ModuleNotFoundError) as ex:
            event_logger.log_with_context(
                action=f"test_connection_error.{ex.__class__.__name__}",
                engine=database.db_engine_spec.__name__,
            )
            raise DatabaseTestConnectionDriverError(
                message=_("Could not load database driver: {}").format(
                    database.db_engine_spec.__name__
                ),
            ) from ex
        except DBAPIError as ex:
            event_logger.log_with_context(
                action=f"test_connection_error.{ex.__class__.__name__}",
                engine=database.db_engine_spec.__name__,
            )
            # check for custom errors (wrong username, wrong password, etc)
            errors = database.db_engine_spec.extract_errors(ex, context)
            raise DatabaseTestConnectionFailedError(errors) from ex
        except SupersetSecurityException as ex:
            event_logger.log_with_context(
                action=f"test_connection_error.{ex.__class__.__name__}",
                engine=database.db_engine_spec.__name__,
            )
            raise DatabaseSecurityUnsafeError(message=str(ex)) from ex
        except SupersetTimeoutException as ex:
            event_logger.log_with_context(
                action=f"test_connection_error.{ex.__class__.__name__}",
                engine=database.db_engine_spec.__name__,
            )
            # bubble up the exception to return a 408
            raise ex
        except Exception as ex:
            event_logger.log_with_context(
                action=f"test_connection_error.{ex.__class__.__name__}",
                engine=database.db_engine_spec.__name__,
            )
            errors = database.db_engine_spec.extract_errors(ex, context)
            raise DatabaseTestConnectionUnexpectedError(errors) from ex

    def validate(self) -> None:
        database_name = self._properties.get("database_name")
        if database_name is not None:
            self._model = DatabaseDAO.get_database_by_name(database_name)