"""Alembic environment.

Migrations run synchronously, so the async ``+aiosqlite`` driver in
DATABASE_URL is stripped to a plain ``sqlite://`` URL here.
"""
import os
from logging.config import fileConfig

from alembic import context
from dotenv import load_dotenv
from sqlalchemy import engine_from_config, pool

load_dotenv()

config = context.config

# Resolve the database URL from the environment, falling back to the ini value.
_db_url = os.getenv("DATABASE_URL")
if _db_url:
    sync_url = _db_url.replace("+aiosqlite", "")
    config.set_main_option("sqlalchemy.url", sync_url)
else:
    sync_url = config.get_main_option("sqlalchemy.url")

# Make sure the directory for the SQLite file exists before connecting.
if sync_url and ":///" in sync_url and "sqlite" in sync_url:
    _path = sync_url.split(":///", 1)[1]
    _dir = os.path.dirname(_path)
    if _dir:
        os.makedirs(_dir, exist_ok=True)

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

# Migrations are written by hand, so no autogenerate target metadata is needed.
target_metadata = None


def run_migrations_offline() -> None:
    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:
    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()