const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const vm = require('node:vm');
const { JSDOM } = require('jsdom');
const { marked } = require('marked');

const read = file => fs.readFileSync(path.join(__dirname, '..', file), 'utf8');

function ui(t) {
  const dom = new JSDOM('<div id="assistant-tab">' + read('public/components/assistant.html') + '</div>', { url: 'https://example.test', runScripts: 'outside-only' });
  const window = dom.window;
  window.eval(read('public/js/accountBoundary.js'));
  assert.equal(window.AccountBoundary.enter({ id: 'synthetic-rendering-owner' }, true), true);
  window.marked = marked;
  window.DOMPurify = require('dompurify')(window);
  window.matchMedia = () => ({ matches: true });
  const toasts = [];
  const context = { window, document: window.document, console, URL, Blob, TextDecoder, AbortController,
    setTimeout() {}, clearTimeout() {}, showToast: (...args) => toasts.push(args), EMPTY_PROMPT_SETS: [[]],
    createAssistantImageStore: () => ({ clear() {}, renderGeneratedImage: () => '' }),
    fetchSavedAssistantChats: async () => ({ success: true, chats: [] }),
    saveAssistantChat: async () => ({ success: true }) };
  vm.createContext(context);
  for (const file of ['assistant/citations.js', 'assistant/sources.js', 'assistant/sharing.js', 'generatedImages.js', 'assistant/export.js', 'clinicalAssistant.js']) {
    vm.runInContext(read('public/js/' + file).replace(/^import[\s\S]*?from ['"][^'"]+['"];\s*/gm, '').replace(/^export /gm, ''), context);
  }
  appBinding(t, context);
  t.after(() => window.close());
  return { context, document: window.document, window, toasts };
}

// The production page binds delegated clicks in bindEvents; the vm harness mirrors it.
function appBinding(t, context) {
  context.bindEvents();
}

const longExcerpt = 'Synthetic excerpt. ' + 'x'.repeat(15000);

function openModal(app, n = 1) {
  const cite = app.document.querySelector('.assistant-cite[data-source-number="' + n + '"]');
  assert.ok(cite, 'citation chip exists');
  cite.click();
  return app.document.querySelector('.assistant-source-modal');
}

test('citation chips open an OWUI-style source modal with title, page and 10k excerpt preview', t => {
  const app = ui(t);
  const sources = [{ number: 1, title: 'Nelson Textbook of Pediatrics', page: 7, excerpt: longExcerpt }];
  app.context.restoreSavedChat({ version: 2, messages: [
    { role: 'user', content: 'Question' },
    { role: 'assistant', content: 'Answer [1].', sources }
  ], lastAnswer: 'Answer [1].', sources });
  const modal = openModal(app);
  assert.ok(modal, 'modal opens');
  assert.equal(modal.getAttribute('role'), 'dialog');
  assert.match(modal.textContent, /Nelson Textbook of Pediatrics/);
  assert.match(modal.textContent, /page 7/);
  const excerpt = modal.querySelector('[data-assistant-source-excerpt]');
  assert.ok(excerpt);
  assert.ok(excerpt.textContent.length >= 10000 && excerpt.textContent.length <= 10200, '10k preview shown');
  const showAll = modal.querySelector('[data-assistant-source-show-all]');
  assert.ok(showAll, 'Show all offered for long excerpts');
  showAll.click();
  assert.ok(excerpt.textContent.length >= 15000, 'Show all reveals the full excerpt');
  assert.equal(showAll.hidden, true, 'toggle hides once expanded');
  // Sidebar switching is preserved alongside the modal.
  assert.match(app.document.querySelector('#assistant-source-1').textContent, /Nelson Textbook of Pediatrics.*page 7/is);
});

test('source modal closes via button, backdrop and Escape', t => {
  const app = ui(t);
  const sources = [{ number: 1, title: 'Synthetic source', page: 3, excerpt: 'Short excerpt.' }];
  app.context.restoreSavedChat({ version: 2, messages: [
    { role: 'user', content: 'Question' },
    { role: 'assistant', content: 'Answer [1].', sources }
  ], lastAnswer: 'Answer [1].', sources });
  let modal = openModal(app);
  assert.equal(modal.querySelector('[data-assistant-source-show-all]'), null, 'no Show all for short excerpts');
  modal.querySelector('.modal-close').click();
  assert.equal(app.document.querySelector('.assistant-source-modal'), null);
  modal = openModal(app);
  modal.click(); // backdrop is the modal element itself
  assert.equal(app.document.querySelector('.assistant-source-modal'), null);
  modal = openModal(app);
  app.window.document.dispatchEvent(new app.window.KeyboardEvent('keydown', { key: 'Escape', bubbles: true }));
  assert.equal(app.document.querySelector('.assistant-source-modal'), null);
});

test('per-turn source maps select the correct source for reused citation numbers', t => {
  const app = ui(t);
  const first = [{ number: 1, title: 'First turn reference', page: 11, excerpt: 'First turn context.' }];
  const second = [{ number: 1, title: 'Second turn reference', page: 23, excerpt: 'Second turn context.' }];
  app.context.restoreSavedChat({ version: 2, messages: [
    { role: 'user', content: 'First question' },
    { role: 'assistant', content: 'First answer. [1]', sources: first },
    { role: 'user', content: 'Second question' },
    { role: 'assistant', content: 'Second answer. [1]', sources: second }
  ], lastAnswer: 'Second answer. [1]', sources: second });
  const citations = app.document.querySelectorAll('#assistant-messages .assistant-cite');
  assert.equal(citations.length, 2);
  citations[0].click();
  assert.match(app.document.querySelector('.assistant-source-modal').textContent, /First turn reference/);
  assert.match(app.document.querySelector('.assistant-source-modal').textContent, /page 11/);
  app.document.querySelector('.assistant-source-modal .modal-close').click();
  citations[1].click();
  const modal = app.document.querySelector('.assistant-source-modal');
  assert.match(modal.textContent, /Second turn reference/);
  assert.match(modal.textContent, /page 23/);
  assert.doesNotMatch(modal.textContent, /First turn reference/);
});