from collections.abc import AsyncGenerator

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

from app.config import settings

engine = create_async_engine(
    settings.database_url,
    pool_size=settings.db_pool_size,
    pool_timeout=settings.db_pool_timeout,
    pool_pre_ping=True,
    echo=False,
)

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


class Base(DeclarativeBase):
    pass


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