"""Database configuration and session management for VoIdea."""

from typing import AsyncGenerator

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

from app.core.config import get_settings

settings = get_settings()

engine = create_async_engine(
    settings.database_url,
    echo=settings.db_echo,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
)

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


async def get_db() -> AsyncGenerator[AsyncSession, None]:
    """Get database session.

    Yields:
        AsyncSession instance
    """
    async with async_session_maker() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()