// Slide 09: MessagesPlaceholder + few-shot examples
// Code slide: how to inject conversation history and demonstration examples.

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: 'Prompts',
    title: 'MessagesPlaceholder + few-shot',
    sectionNumber: 1,
  });

  ds.helpers.addCodeBlock(slide, pres, theme, {
    x: 0.5, y: 1.5, w: 9.0, h: 3.25,
    language: 'python',
    filePath: 'examples/prompt_fewshot.py',
    code: [
      'from langchain_core.prompts import (',
      '    ChatPromptTemplate, MessagesPlaceholder, FewShotChatMessagePromptTemplate,',
      ')',
      '',
      '# Few-shot блок: примеры "вопрос -> ответ"',
      'examples = [',
      '    {"input": "2+2", "output": "4"},',
      '    {"input": "3*3", "output": "9"},',
      ']',
      'example_prompt = ChatPromptTemplate.from_messages([',
      '    ("human", "{input}"),',
      '    ("ai", "{output}"),',
      '])',
      'few_shot = FewShotChatMessagePromptTemplate(',
      '    example_prompt=example_prompt, examples=examples,',
      ')',
      '',
      '# Сборка: system + few-shot + история + текущий вопрос',
      'prompt = ChatPromptTemplate.from_messages([',
      '    ("system", "You are a math assistant."),',
      '    few_shot,',
      '    MessagesPlaceholder("history"),',
      '    ("human", "{question}"),',
      '])',
    ].join('\n'),
  });

  ds.helpers.addCallout(slide, pres, theme, {
    x: 0.5, y: 4.85, w: 9.0, h: 0.3,
    kind: 'success',
    text: 'MessagesPlaceholder("history") -- дырка, в которую при invoke подставляется список прошлых сообщений.',
  });

  ds.helpers.addSourceLine(slide, pres, theme, {
    source: 'python.langchain.com/docs/how_to/few_shot_examples_chat/',
  });
  ds.helpers.addPageNumber(slide, pres, theme, 9);
}

module.exports = { createSlide };