"""
Slide 15: async + config -- полный контроль
Section 1: LangChain 1.0
Source: slides/section1-chains/slide-15.js

Сгенерировано автоматически из slide-NN.js / sectionN.pptx.
Паттерн провайдера скопирован из
bro-js/agents/teacher/assistant/src/angry_teacher/llm.py.

Запуск:
  cd langchain-evolution-deck
  cp .env.example .env   # заполни OPENAI_API_KEY
  python examples/slide-015/script.py
"""
import os
from dotenv import load_dotenv
from langchain_openai import ChatOpenAI

load_dotenv()

llm = ChatOpenAI(
    # model="openrouter/free",
    # model="qwen/qwen3.5-35b-a3b",
    model="openai/gpt-oss-20b",
    # model="nvidia/nemotron-3-nano",
    # model="qwen/qwen3.5-9b",
    base_url="https://llm.brojs.ru/v1",
    # base_url="https://api.minimax.io/v1",
    # base_url="http://0.0.0.0:8090/v1",
    # base_url="https://openrouter.ai/api/v1",
    # api_key=os.getenv("MINIMAX_API_KEY"),
    api_key=(os.getenv("OPENAI_API_KEY") or "").strip() or None,
    temperature=0.7,
    stream_usage=True,
)


# === Code from slide 15 ===
import asyncio
from langchain_core.runnables import ConfigurableField

# Любой Runnable имеет ainvoke / astream / abatch
async def main():
    # Один async-вызов
    result = await chain.ainvoke({"language": "French", "text": "Hi"})

    # Async stream
    async for chunk in chain.astream({"language": "French", "text": "Hi"}):
        print(chunk, end="", flush=True)

asyncio.run(main())

# configurable_fields -- параметры, которые можно переопределять
# на лету через config={"configurable": {...}}
configurable_chain = init_chat_model("openai:gpt-4.1-mini",
    temperature=0.7).configurable_fields(
    temperature=ConfigurableField(id="temperature"),
)
# configurable_chain.invoke(messages, config={"configurable": {"temperature": 0.0}})