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.database import Base
import app.models  # noqa: F401 — registers Document, DocumentCategory, CategoryAssignment

config = context.config
config.set_main_option("sqlalchemy.url", settings.DATABASE_URL)

if config.config_file_name:
    fileConfig(config.config_file_name)

target_metadata = Base.metadata

# Separate version table — must not collide with the main backend's alembic_version table.
VERSION_TABLE = "alembic_version_doc_service"


def run_migrations_offline():
    context.configure(
        url=settings.DATABASE_URL,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        version_table=VERSION_TABLE,
    )
    with context.begin_transaction():
        context.run_migrations()


def do_run_migrations(connection):
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        version_table=VERSION_TABLE,
    )
    with context.begin_transaction():
        context.run_migrations()


async def run_migrations_online():
    engine = create_async_engine(settings.DATABASE_URL)
    async with engine.connect() as conn:
        await conn.run_sync(do_run_migrations)
    await engine.dispose()


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