// Slide 20: create_agent -- the unified agent entry point (v1.0)
// Code slide: a working agent in 10 lines.

const ds = require('./design-system');

function createSlide(pres, theme) {
  const slide = pres.addSlide();
  ds.helpers.slideBase(slide, pres, theme);

  ds.helpers.addHeader(slide, pres, theme, {
    eyebrow: 'STAGE 1: CHAINS',
    section: 'Agents',
    title: 'create_agent -- один вход для всех агентов',
    sectionNumber: 1,
  });

  ds.helpers.addCodeBlock(slide, pres, theme, {
    x: 0.5, y: 1.5, w: 9.0, h: 3.25,
    language: 'python',
    filePath: 'examples/agent_basic.py',
    code: [
      'from langchain.agents import create_agent',
      'from langchain.tools import tool',
      '',
      '@tool',
      'def get_weather(city: str) -> str:',
      '    """Get weather for a city."""',
      '    return f"Sunny, 22C in {city}"',
      '',
      '# Один вызов вместо create_react_agent / create_openai_functions_agent / ...',
      'agent = create_agent(',
      '    model="openai:gpt-4.1",',
      '    tools=[get_weather],',
      '    system_prompt="You are a weather assistant.",',
      ')',
      '',
      '# invoke -> dict {"messages": [...]}; последнее сообщение = ответ',
      'result = agent.invoke({"messages": [{"role": "user",',
      '    "content": "weather in Paris?"}]})',
      'print(result["messages"][-1].content)',
    ].join('\n'),
  });

  ds.helpers.addCallout(slide, pres, theme, {
    x: 0.5, y: 4.85, w: 9.0, h: 0.3,
    kind: 'info',
    text: 'Под капотом LangGraph-runtime: durable execution, checkpointing, human-in-the-loop доступны через middleware.',
  });

  ds.helpers.addSourceLine(slide, pres, theme, {
    source: 'docs.langchain.com/oss/python/langchain/agents',
  });
  ds.helpers.addPageNumber(slide, pres, theme, 20);
}

module.exports = { createSlide };