from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
from app.config import settings
from app.models import Base

engine: AsyncEngine = create_async_engine(settings.database_url, echo=False)
AsyncSessionLocal = sessionmaker(
    bind=engine, class_=AsyncSession, expire_on_commit=False
)

async def init_db():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

async def get_db():
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()