"""Alembic environment configuration for async SQLAlchemy."""

import asyncio
from logging.config import fileConfig

from alembic import context
from sqlalchemy.ext.asyncio import create_async_engine

from app.core.config import settings
from app.db.base import Base

# Import all models so they are registered on Base.metadata
import app.models  # noqa: F401

# Alembic Config object
config = context.config

# Set the SQLAlchemy URL from our application settings
config.set_main_option("sqlalchemy.url", settings.DATABASE_URL)

# Interpret the config file for Python logging
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Target metadata for autogenerate
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode."""
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        render_as_batch=True,  # Required for SQLite ALTER TABLE support
    )

    with context.begin_transaction():
        context.run_migrations()


def do_run_migrations(connection):
    """Execute migrations in a synchronous context."""
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        render_as_batch=True,
    )

    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations() -> None:
    """Create async engine and run migrations using run_sync."""
    connectable = create_async_engine(settings.DATABASE_URL)

    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

    await connectable.dispose()


if context.is_offline_mode():
    run_migrations_offline()
else:
    asyncio.run(run_async_migrations())