from langchain.tools import BaseTool
from langchain_openai.chat_models import ChatOpenAI
from config import config
import requests

class CodeGenTool(BaseTool):
    """
    Инструмент для генерации кода по текстовому описанию или на основе шаблона.
    Формат команды:
      - "spec text" для чистой генерации кода.
      - "template=<path_or_url>,spec=<description>" для генерации на основе шаблона.
    """
    name: str = "code_gen"
    description: str = (
        "Generate or complete code snippets in various programming languages. Use for questions like ‘write a function…’, ‘generate SQL…’, or general code generation tasks."
    )

    def _run(self, command: str) -> str:
        # Проверяем наличие шаблона
        template_content = None
        spec = command
        if command.startswith("template=") and ",spec=" in command:
            tmpl, spec_part = command.split(",spec=", 1)
            _, path_or_url = tmpl.split("=", 1)
            path_or_url = path_or_url.strip()
            # Загружаем содержимое шаблона
            if path_or_url.startswith("http"):  # URL
                resp = requests.get(path_or_url)
                resp.raise_for_status()
                template_content = resp.text
            else:  # локальный файл
                with open(path_or_url, "r", encoding="utf-8") as f:
                    template_content = f.read()
            spec = spec_part.strip()

        # Собираем промпт
        if template_content:
            prompt = (
                f"# Template provided below:\n```python\n{template_content}\n```\n"
                f"Write Python code to: {spec}"
            )
        else:
            prompt = f"Write Python code to: {spec}"

        llm = ChatOpenAI(
            model_name=config.OPENAI_MODEL,
            openai_api_key=config.OPENAI_API_KEY,
            temperature=0.2
        )
        return llm.invoke(prompt)

    async def _arun(self, command: str) -> str:
        raise NotImplementedError("Async not supported.")