from collections.abc import AsyncGenerator

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

from app.core.config import settings


class Base(DeclarativeBase):
    pass


engine = create_async_engine(
    settings.database_url,
    echo=settings.debug,
    pool_pre_ping=True,
    pool_size=5,
    max_overflow=10,
)

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


async def get_db() -> AsyncGenerator[AsyncSession, None]:
    async with AsyncSessionLocal() as session:
        yield session