"""Alembic migration environment."""

from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool

from alembic import context

config = context.config
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

target_metadata = None  # Set to your SQLAlchemy Base.metadata when models exist


def run_migrations_offline():
    url = config.get_main_option("sqlalchemy.url")
    context.configure(url=url, target_metadata=target_metadata, literal_binds=True)
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online():
    connectable = engine_from_config(
        config.get_section(config.config_ini_section), prefix="sqlalchemy.", poolclass=pool.NullPool
    )
    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=target_metadata)
        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()