from collections.abc import AsyncIterator

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

from app.config.settings import settings


engine = create_async_engine(
    settings.postgres_dsn,
    echo=settings.debug,
    pool_pre_ping=True,
)

AsyncSessionLocal = async_sessionmaker(
    bind=engine,
    class_=AsyncSession,
    autoflush=False,
    autocommit=False,
    expire_on_commit=False,
)


async def get_db() -> AsyncIterator[AsyncSession]:
    async with AsyncSessionLocal() as session:
        yield session