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

from app.core.config import settings

engine = create_async_engine(
    settings.database_url,
    pool_pre_ping=True,
)

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


async def db_ping() -> dict:
    async with AsyncSessionLocal() as session:
        result = await session.execute(text("select 1 as ok"))
        row = result.mappings().first()
        return {"ok": row["ok"] if row else None}