// Slide 15: Async + configurable -- ainvoke/astream + chain.config
// Code slide: how to use chains from async code and override params at call site.

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: 'Runnable',
    title: 'async + config -- полный контроль',
    sectionNumber: 1,
  });

  ds.helpers.addCodeBlock(slide, pres, theme, {
    x: 0.5, y: 1.5, w: 9.0, h: 3.25,
    language: 'python',
    filePath: 'examples/runnable_async.py',
    code: [
      '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}})',
    ].join('\n'),
  });

  ds.helpers.addCallout(slide, pres, theme, {
    x: 0.5, y: 4.85, w: 9.0, h: 0.3,
    kind: 'success',
    text: 'configurable_fields + config={"configurable": {...}} -- паттерн для multi-tenant LLM-приложений.',
  });

  ds.helpers.addSourceLine(slide, pres, theme, {
    source: 'python.langchain.com/docs/how_to/configurable/',
  });
  ds.helpers.addPageNumber(slide, pres, theme, 15);
}

module.exports = { createSlide };