from logging.config import fileConfig

from sqlalchemy import create_engine, pool

from alembic import context
import os


# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

from models import Base
target_metadata = Base.metadata

# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.


def run_migrations_offline() -> None:
    url = os.getenv("DATABASE_URL", config.get_main_option("sqlalchemy.url"))
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    url = config.get_main_option("sqlalchemy.url")
    connectable = create_engine(url, 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()