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

from backend.core.config import settings
from backend.db.base import Base

engine = create_async_engine(settings.db_url, echo=False, pool_pre_ping=True, future=True)
AsyncSessionLocal = async_sessionmaker(bind=engine, expire_on_commit=False, class_=AsyncSession)


async def get_session() -> AsyncSession:
    async with AsyncSessionLocal() as session:
        yield session


async def init_models() -> None:
    """Create all tables based on imported models."""
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)