'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('fs');
const os = require('os');
const path = require('path');
const { extractFaqFromLdJson } = require('../src/faq-fetcher');
const { updateMarkdownFile } = require('../src/faq-update');

test('faq: extracts FAQPage JSON-LD questions', () => {
  const html = `<script type="application/ld+json">{"@type":"FAQPage","mainEntity":[{"name":"Q1?","acceptedAnswer":{"text":"A1"}},{"name":"Q2?","acceptedAnswer":{"text":"A2"}}]}</script>`;
  const qs = extractFaqFromLdJson(html);
  assert.deepEqual(qs, [{ q: 'Q1?', a: 'A1' }, { q: 'Q2?', a: 'A2' }]);
});

test('faq: updates existing answer and appends new question', () => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'kb-faq-'));
  const file = path.join(dir, '01.md');
  fs.writeFileSync(file, '---\ntitle: T\n---\n### Q: Old?\nold answer\n');
  const r = updateMarkdownFile(file, [{ q: 'Old?', a: 'new answer' }, { q: 'New?', a: 'new q answer' }]);
  assert.equal(r.changed, true);
  assert.equal(r.updated, 1);
  assert.equal(r.added, 1);
  const out = fs.readFileSync(file, 'utf8');
  assert.match(out, /Old\?\nnew answer/);
  assert.match(out, /New\?\nnew q answer/);
});

test('faq: normalized question match avoids duplicate append', () => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'kb-faq-norm-'));
  const file = path.join(dir, '01.md');
  fs.writeFileSync(file, '---\ntitle: T\n---\n### Q: How does Brexit affect shipping\nold\n');
  const r = updateMarkdownFile(file, [{ q: 'How does Brexit affect shipping?', a: 'new' }]);
  assert.equal(r.added, 0);
  assert.equal(r.updated, 1);
  const out = fs.readFileSync(file, 'utf8');
  assert.equal((out.match(/### Q:/g) || []).length, 1);
  assert.match(out, /new/);
});