from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
from sqlalchemy.orm import DeclarativeBase
from app.config.settings import settings

engine = create_async_engine(settings.database_url, echo=settings.debug)
async_session = async_sessionmaker(engine, expire_on_commit=False)


class Base(DeclarativeBase):
    pass


async def get_db() -> AsyncSession:
    async with async_session() as session:
        yield session


async def init_db():
    import app.models  # noqa: F401 — ensure all models are registered
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)