// Slide 23: Middleware -- HumanInTheLoop + PIIRedaction + Summarization
// Code slide: cross-cutting hooks attached at agent construction.

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: 'Middleware',
    title: 'Cross-cutting concerns одной строкой',
    sectionNumber: 1,
  });

  ds.helpers.addCodeBlock(slide, pres, theme, {
    x: 0.5, y: 1.5, w: 9.0, h: 3.25,
    language: 'python',
    filePath: 'examples/middleware.py',
    code: [
      'from langchain.agents import create_agent',
      'from langchain.agents.middleware import (',
      '    HumanInTheLoopMiddleware,',
      '    PIIRedactionMiddleware,',
      '    SummarizationMiddleware,',
      ')',
      'from langchain.tools import tool',
      '',
      '@tool',
      'def send_email(to: str, body: str) -> str:',
      '    """Send an email to recipient."""',
      '    return f"sent to {to}"',
      '',
      'agent = create_agent(',
      '    model="openai:gpt-4.1",',
      '    tools=[send_email],',
      '    middleware=[',
      '        HumanInTheLoopMiddleware(interrupt_on={"send_email": True}),',
      '        PIIRedactionMiddleware(redact_emails=True, redact_phones=True),',
      '        SummarizationMiddleware(trigger=("tokens", 4000)),',
      '    ],',
      ')',
    ].join('\n'),
  });

  // Right-side mini-glossary callouts (left side has code; reuse addCallout below)
  ds.helpers.addCallout(slide, pres, theme, {
    x: 0.5, y: 4.85, w: 9.0, h: 0.3,
    kind: 'warning',
    text: 'Все три middleware -- встроенные. Custom middleware пишутся как before_model/after_model hooks.',
  });

  ds.helpers.addSourceLine(slide, pres, theme, {
    source: 'docs.langchain.com/oss/python/langchain/middleware',
  });
  ds.helpers.addPageNumber(slide, pres, theme, 23);
}

module.exports = { createSlide };