Main

def check_settings(logger_name: str) -> None:
    """
    Check and register the settings

    Verify the consistency of the settings, in particular that required
    variables are set.

    Raises:
        ValidationError: If the configuration is invalid.
    """
    settings = Inject(get_settings)
    db_settings = Inject(get_db_settings)
    email_settings = Inject(get_email_settings)
    logger = get_logger(logger_name)
    logger.debug("Fractal Settings:")
    for key, value in chain(
        db_settings.model_dump().items(),
        settings.model_dump().items(),
        email_settings.model_dump().items(),
    ):
        if any(s in key.upper() for s in ["PASSWORD", "SECRET", "KEY"]):
            value = "*****"
        logger.debug(f"  {key}: {value}")

def collect_routers(app: FastAPI) -> None:
    """
    Register the routers to the application

    Args:
        app:
            The application to register the routers to.
    """
    from .app.routes.admin.v2 import router_admin
    from .app.routes.api import router_api
    from .app.routes.api.v2 import router_api as router_api_v2
    from .app.routes.auth.router import router_auth

    app.include_router(router_api, prefix="/api")
    app.include_router(router_api_v2, prefix="/api/v2")
    app.include_router(router_admin, prefix="/admin/v2", tags=["Admin area"])
    app.include_router(router_auth, prefix="/auth", tags=["Authentication"])

def start_application() -> FastAPI:
    """
    Create the application, initialise it and collect all available routers.

    Returns:
        app:
            The fully initialised application.
    """
    app = FastAPI(lifespan=lifespan)

    settings = Inject(get_settings)
    app.add_middleware(
        SlowResponseMiddleware,
        time_threshold=settings.FRACTAL_LONG_REQUEST_TIME,
    )
    app.add_exception_handler(
        HTTPExceptionWithData,
        handler=data_exception_handler,
    )

    collect_routers(app)
    return app