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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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import logging
from contextlib import closing
from typing import Any, Dict, Optional

from flask_appbuilder.security.sqla.models import User
from sqlalchemy import select

from superset.commands.base import BaseCommand
from superset.databases.commands.exceptions import DatabaseSecurityUnsafeError
from superset.databases.dao import DatabaseDAO
from superset.models.core import Database
from superset.security.analytics_db_safety import DBSecurityException

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()
        try:
            uri = self._properties.get("sqlalchemy_uri", "")
            if self._model and uri == self._model.safe_sqlalchemy_uri():
                uri = self._model.sqlalchemy_uri_decrypted

            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", "{}"),
            )
            if database is not None:
                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)
            with closing(engine.connect()) as conn:
                conn.scalar(select([1]))
        except DBSecurityException as ex:
            logger.warning(ex)
            raise DatabaseSecurityUnsafeError()

    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)