#!/usr/bin/env python3
# -*- coding: utf-8 -*-

#   Copyright (C) 2019 Christoph Fink, University of Helsinki
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License
#   as published by the Free Software Foundation; either version 3
#   of the License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, see <http://www.gnu.org/licenses/>.

"""An SQLAlchemy engine and sessionmaker."""


__all__ = ["engine", "Session"]


import sqlalchemy
import sqlalchemy.orm

from .config import Config


with Config() as config:
    engine = sqlalchemy.create_engine(config["connection_string"])

if engine.dialect.name == "postgresql":
    engine.execute("""
        CREATE EXTENSION IF NOT EXISTS
            postgis;
    """)

Session = sqlalchemy.orm.sessionmaker(engine)
