// ============================================================
// DECK REVIEW
// ============================================================
// The model that writes a deck never sees it, so overflow, a figure on the
// wrong slide and a nine-item list that wants two columns are invisible to it.
// The review renders the deck and looks.
//
// The thing that has to hold: it may move content, never change it.

const test = require('node:test');
const assert = require('node:assert');
const fs = require('fs');
const path = require('path');
const review = require('../src/utils/deckReview');
const read = p => fs.readFileSync(path.join(__dirname, '..', p), 'utf8');

const BEFORE = { slides: [
  { type: 'bullets', heading: 'Management', bullets: [{ text: 'One' }, { text: 'Two' }, { text: 'Three' }, { text: 'Four' }] },
  { type: 'figure', heading: 'Anatomy', bullets: [{ text: 'Five' }], image_job: 'job-a' },
]};
const verdict = after => review.movedOnly(review.fingerprint(BEFORE), review.fingerprint(after));

test('a review may move content between slides and layouts', () => {
  assert.equal(verdict(BEFORE), null, 'unchanged');

  // Splitting an overfull slide is the most valuable fix there is, and it
  // necessarily repeats the heading.
  assert.equal(verdict({ slides: [
    { type: 'bullets', heading: 'Management', bullets: [{ text: 'One' }, { text: 'Two' }] },
    { type: 'bullets', heading: 'Management (continued)', bullets: [{ text: 'Three' }, { text: 'Four' }] },
    { type: 'figure', heading: 'Anatomy', bullets: [{ text: 'Five' }], image_job: 'job-a' },
  ]}), null, 'split into two');

  // Regrouping into labelled columns moves text between fields; the words stay.
  // Column labels are structure, not content, so they may be new.
  assert.equal(verdict({ slides: [
    { type: 'compare', heading: 'Management', columns: [
      { label: 'EARLY', bullets: [{ text: 'One' }, { text: 'Two' }] },
      { label: 'LATE', bullets: [{ text: 'Three' }, { text: 'Four' }] }] },
    { type: 'figure', heading: 'Anatomy', bullets: [{ text: 'Five' }], image_job: 'job-a' },
  ]}), null, 'bullets to a comparison');

  // Reordering slides.
  assert.equal(verdict({ slides: [BEFORE.slides[1], BEFORE.slides[0]] }), null, 'reordered');
});

test('a review that changes the words is discarded', () => {
  // A model told not to rewrite will still occasionally improve a sentence, and
  // a silent edit to clinical text is the one thing this must never introduce.
  assert.match(verdict({ slides: [
    { type: 'bullets', heading: 'Management', bullets: [{ text: 'One thing' }, { text: 'Two' }, { text: 'Three' }, { text: 'Four' }] },
    BEFORE.slides[1],
  ]}), /wording changed/);

  // Dropping a bullet is a change too, not a layout decision.
  assert.match(verdict({ slides: [
    { type: 'bullets', heading: 'Management', bullets: [{ text: 'One' }, { text: 'Two' }] },
    BEFORE.slides[1],
  ]}), /wording changed/);

  // Figures are drawn already; a review places them but cannot invent or lose one.
  assert.match(verdict({ slides: [BEFORE.slides[0],
    { type: 'bullets', heading: 'Anatomy', bullets: [{ text: 'Five' }] }] }), /figures changed/);

  // A heading may be reused or extended, never invented.
  assert.match(verdict({ slides: [
    { type: 'bullets', heading: 'Key points', bullets: [{ text: 'One' }, { text: 'Two' }, { text: 'Three' }, { text: 'Four' }] },
    BEFORE.slides[1],
  ]}), /heading was invented/);
});

test('the reviewer names slides, and the server moves the text', () => {
  // Asking for the whole deck back put the reply in proportion to the deck
  // rather than to the number of problems: a fourteen-slide deck came back cut
  // off mid-object every time. A patch is small, and the words never pass
  // through the model at all — which is a stronger guarantee than asking it not
  // to rewrite them and checking afterwards.
  const deck = { title: 'T', slides: [
    { type: 'bullets', heading: 'Management', bullets: [{ text: 'A' }, { text: 'B' }, { text: 'C' }, { text: 'D' }, { text: 'E' }, { text: 'F' }] },
    { type: 'figure', heading: 'Anatomy', bullets: [{ text: 'K' }], image_job: 'job-a' },
  ]};
  const intact = out => review.movedOnly(review.fingerprint(deck), review.fingerprint(out.deck));

  const two = review.applyChanges(deck, [{ slide: 0, action: 'two' }]);
  assert.equal(two.applied, 1);
  assert.equal(two.deck.slides[0].type, 'two');
  assert.equal(intact(two), null);

  const split = review.applyChanges(deck, [{ slide: 0, action: 'split', after: 2, heading: 'Management (continued)' }]);
  assert.equal(split.deck.slides.length, 3);
  assert.equal(intact(split), null);

  const compare = review.applyChanges(deck, [{ slide: 0, action: 'compare', at: 3, labels: ['EARLY', 'LATE'] }]);
  assert.equal(compare.deck.slides[0].columns.length, 2);
  assert.equal(intact(compare), null);

  // A continuation heading is the reviewer's only piece of text, so it is
  // replaced rather than trusted when it does not continue anything.
  const invented = review.applyChanges(deck, [{ slide: 0, action: 'split', after: 2, heading: 'Totally New' }]);
  assert.equal(invented.deck.slides[1].heading, 'Management (continued)');
  assert.equal(intact(invented), null);

  // Nonsense is ignored rather than applied badly.
  for (const bad of [[{ slide: 9, action: 'two' }],
                     [{ slide: 0, action: 'split', after: 5 }],
                     [{ slide: 0, action: 'compare', at: 3, labels: ['only'] }],
                     [{ slide: 0, action: 'nonsense' }]]) {
    assert.equal(review.applyChanges(deck, bad).applied, 0, JSON.stringify(bad));
  }

  // Two splits at once must not renumber each other.
  const both = review.applyChanges(deck, [{ slide: 0, action: 'split', after: 1 }, { slide: 1, action: 'two' }]);
  assert.equal(intact(both), null);
});

test('nothing about the review can fail a generation', async () => {
  const src = read('src/utils/deckReview.js');
  // Off unless an administrator names a reviewer.
  const off = await review.review(BEFORE, { model: '' });
  assert.equal(off.reviewed, false);
  assert.equal(off.deck, BEFORE, 'the deck comes back untouched');

  // A reviewer that throws, returns nothing, or returns prose gives the deck back.
  const broken = await review.review(BEFORE, {
    model: 'some-model', gotenberg: 'http://127.0.0.1:1', mime: 'application/x',
    pptx: Buffer.from(''), extractJson: () => null,
    callAI: async () => { throw new Error('provider unreachable'); },
  });
  assert.equal(broken.reviewed, false);
  assert.equal(broken.deck, BEFORE);
  assert.match(src, /catch \(err\) \{\s*\n\s*console\.warn\('\[deck-review\] skipped:'/);

  // A deck longer than the pass can look at is left alone rather than truncated.
  const long = await review.review({ slides: new Array(review.MAX_SLIDES + 1).fill({ type: 'section', heading: 'x' }) },
    { model: 'some-model' });
  assert.equal(long.reviewed, false);
  assert.match(long.reason, /too long/);
});

test('the reviewer is admin-chosen, off by default, and runs once per change', () => {
  const route = read('src/routes/myResources.js');
  assert.match(route, /db\.getSetting\('my_resources\.review_model', ''\)/);
  assert.match(route, /if \(reviewModel\) \{/, 'nothing happens without one');

  // Modifying reviews too, which generation-only used to forbid. The reasoning
  // changed with the evidence: an edit is made against how the deck looked
  // *before* it, so a slide that gains two bullets only overflows once it is
  // rendered again — exactly the class of fault the reviewer exists for. The
  // old rule assumed refining was a text edit; it is a layout edit as often as
  // not.
  const refine = route.slice(route.indexOf("router.post('/my-resources/:id/refine'"));
  assert.match(refine, /deckReview\.review\(revisedDeck/);
  assert.match(refine, /if \(revisedDeck && visionModel\)/, 'and only when one is configured');
  // Still one pass. The verification runs on the result, never in a loop.
  assert.equal((refine.match(/deckReview\.review\(/g) || []).length, 1);
  // The key has to be writable, or saving it silently does nothing.
  assert.match(read('src/routes/adminConfig.js'), /'clinical_assistant\.', 'my_resources\.'\]/);
  // And the image can actually rasterise a deck.
  assert.match(read('Dockerfile'), /poppler-utils/);
  assert.match(read('src/utils/deckReview.js'), /'pdftoppm', \['-png', '-r', String\(RENDER_DPI\)/);
});