from collections.abc import AsyncGenerator

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

from app.core.config import settings


class Base(DeclarativeBase):
    pass


engine = create_async_engine(settings.database_url, echo=False, future=True)
AsyncSessionLocal = async_sessionmaker(engine, expire_on_commit=False)


async def get_db() -> AsyncGenerator[AsyncSession, None]:
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise


async def init_db() -> None:
    from app.models import palm_report, reading, share_image_job, uploaded_image, user  # noqa: F401

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