// Slide 11: PydanticOutputParser -- structured output via Pydantic schema
// Code slide: Pydantic model -> parser -> validated instance.

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: 'Output parsers',
    title: 'PydanticOutputParser -- типизированный выход',
    sectionNumber: 1,
  });

  ds.helpers.addCodeBlock(slide, pres, theme, {
    x: 0.5, y: 1.5, w: 9.0, h: 3.25,
    language: 'python',
    filePath: 'examples/parser_pydantic.py',
    code: [
      'from pydantic import BaseModel, Field',
      'from langchain_core.prompts import ChatPromptTemplate',
      'from langchain_core.output_parsers import PydanticOutputParser',
      'from langchain.chat_models import init_chat_model',
      '',
      'class MovieReview(BaseModel):',
      '    title: str = Field(description="Movie title")',
      '    rating: int = Field(description="Rating from 1 to 10")',
      '    summary: str = Field(description="One-sentence summary")',
      '',
      'parser = PydanticOutputParser(pydantic_object=MovieReview)',
      '',
      'prompt = ChatPromptTemplate.from_messages([',
      '    ("system", "Extract review fields.\\n{format_instructions}"),',
      '    ("human", "{review_text}"),',
      ']).partial(format_instructions=parser.get_format_instructions())',
      '',
      'chain = prompt | init_chat_model("openai:gpt-4.1-mini") | parser',
      'review = chain.invoke({"review_text": "Inception was brilliant. 9/10."})',
      'print(review.title, review.rating, review.summary)',
    ].join('\n'),
  });

  ds.helpers.addCallout(slide, pres, theme, {
    x: 0.5, y: 4.85, w: 9.0, h: 0.3,
    kind: 'success',
    text: 'В v1.0 рекомендуется model.with_structured_output(Schema) -- он использует tool calling и точнее.',
  });

  ds.helpers.addSourceLine(slide, pres, theme, {
    source: 'python.langchain.com/docs/how_to/pydantic_output_parser/',
  });
  ds.helpers.addPageNumber(slide, pres, theme, 11);
}

module.exports = { createSlide };