from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, async_session
from sqlalchemy.orm import DeclarativeBase
from mqtt_home.config import get_settings


class Base(DeclarativeBase):
    pass


def get_engine():
    settings = get_settings()
    return create_async_engine(
        settings.database_url,
        echo=False,
    )


def get_session_factory(engine=None):
    _engine = engine or get_engine()
    return async_sessionmaker(_engine, expire_on_commit=False)


async def init_db():
    engine = get_engine()
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    await engine.dispose()


async def get_db():
    factory = get_session_factory()
    async with factory() as session:
        yield session