from backend.core.config import settings
from backend.llm.amd_llm import get_amd_llm
from backend.llm.hf_llm import get_hf_llm
from backend.llm.openai_llm import get_openai_llm


def _normalize_provider(provider):
    return (provider or "").split("#", 1)[0].strip().lower()

def get_llm():
    provider = _normalize_provider(settings.LLM_PROVIDER)

    if provider == "openai":
        return get_openai_llm()

    elif provider == "hf":
        return get_hf_llm()

    elif provider == "amd":
        return get_amd_llm()

    else:
        raise ValueError(
            f"Invalid LLM_PROVIDER: '{settings.LLM_PROVIDER}'. Use one of: openai, hf, amd."
        )