app/factory.py

from .providers.hf_openai import HFOpenAIProvider, configured_models


class ProviderFactory:
    _instance = None

    @classmethod
    def get_provider(cls, model_name: str) -> HFOpenAIProvider:
        if model_name not in configured_models():
            raise ValueError(f"Unsupported model: {model_name}")
        if cls._instance is None:
            cls._instance = HFOpenAIProvider()
        return cls._instance