"""FluentGerman.ai — Database setup (async MySQL)."""

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 get_settings

engine = create_async_engine(
    get_settings().database_url,
    echo=get_settings().debug,
    pool_recycle=3600,  # Reconnect before MySQL's wait_timeout (default 8h)
)
async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)


class Base(DeclarativeBase):
    pass


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