"""PostgreSQL async engine and session factory management."""

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

from app.config import PostgresConfig


def create_postgres_engine(config: PostgresConfig) -> AsyncEngine:
    return create_async_engine(config.dsn, pool_pre_ping=True)


def create_postgres_session_factory(
    engine: AsyncEngine,
) -> async_sessionmaker[AsyncSession]:
    return async_sessionmaker(engine, expire_on_commit=False)