"""Alembic environment for migrations."""
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)

import os, sys
sys.path.insert(0, os.getcwd())

from app.models import Base  # noqa
target_metadata = Base.metadata

db_url = os.environ.get("DATABASE_URL") or config.get_main_option("sqlalchemy.url")
config.set_main_option("sqlalchemy.url", db_url)


def run_migrations_offline() -> None:
    context.configure(url=db_url, literal_binds=True, dialect_opts={"paramstyle": "named"})
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    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()