"""
Slide 106: Slide 20
Section 4: Open SWE
Source: slides/section4-openswe/section4.pptx

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-106/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 106 ===
// open_swe/observability.py:1-15

  # observability.py
  from datadog import statsd
> from langchain_core.tracers import (
>     LangChainTracer,
> )

  tracer = LangChainTracer(
>     project_name="open-swe-prod",
> )
>  
  def record_step(thread_id, duration_s):
      statsd.histogram(
          "open_swe.step.duration_s",
          duration_s, tags=[f"t:{thread_id}"],
      )