"""LLM service — call LLM API with optional DI."""
import json

from config import LLM_URL, LLM_KEY, LLM_MODEL

# Ленивый singleton — обратная совместимость
_llm_client = None


def _get_default_client():
    global _llm_client
    if _llm_client is None:
        from services.llm_client import HttpxLLMClient
        _llm_client = HttpxLLMClient(url=LLM_URL, key=LLM_KEY, model=LLM_MODEL)
    return _llm_client


def call_llm(current_spec, doc_text, build_prompt_fn, llm_client=None):
    """Call LLM. Returns (parsed_result, prompt_id).
    llm_client: LLMClient (optional). Default — HttpxLLMClient (prod).
    """
    if llm_client is None:
        llm_client = _get_default_client()

    prompt, prompt_id = build_prompt_fn(current_spec, doc_text)
    raw_text = llm_client.complete(prompt)

    json_text = raw_text
    if "```json" in json_text:
        json_text = json_text.split("```json")[1].split("```")[0]
    elif "```" in json_text:
        json_text = json_text.split("```")[1].split("```")[0]
    return json.loads(json_text.strip()), prompt_id