"""Databaskonfiguration och session-hantering."""
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
from sqlalchemy.orm import declarative_base
from app.config import get_settings

settings = get_settings()

engine = create_async_engine(
    settings.DATABASE_URL,
    echo=settings.DEBUG,
    future=True,
)

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

Base = declarative_base()


async def get_db() -> AsyncSession:
    """Dependency för FastAPI-endpoints."""
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()