// A deck re-skinned in the library rendered in the default palette anyway. The
// picker saved the choice correctly and the renderer could apply it correctly;
// the theme was dropped in between, by the step that puts the drawn figures
// back onto the slides.
//
// attachFigures rebuilds the deck as a fresh object, and a fresh object keeps
// only the fields it names. It named title, subtitle, date and slides. Three
// different themes rendered byte-identical files.
const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

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

test('the theme survives the trip to the renderer', () => {
  const src = read('src/utils/documentExport.js');
  const out = src.slice(src.indexOf('var out = {'), src.indexOf('var out = {') + 220);
  assert.match(out, /theme: deck\.theme/,
    'attachFigures drops the theme, so every export renders in the default palette');
});

test('every field the renderer reads off the deck is carried', () => {
  // The failure was one missing key in an object literal, and it was silent.
  // Anything the renderer reads at deck level has to be listed there.
  const src = read('src/utils/documentExport.js');
  const out = src.slice(src.indexOf('var out = {'), src.indexOf('var out = {') + 220);
  for (const field of ['title', 'subtitle', 'date', 'theme', 'slides']) {
    assert.match(out, new RegExp(field + ':'), field + ' is not carried through attachFigures');
  }
});

test('the saved theme is what the library writes, and the renderer reads', () => {
  // Both ends already worked; this pins that they agree on the field name.
  const route = read('src/routes/myResources.js');
  assert.match(route, /deck\.theme = theme/, 'the library writes deck.theme');
  const renderer = read('scripts/render_pptx.py');
  assert.match(renderer, /apply_theme\(/);
  assert.match(renderer, /spec\.get\("theme"\)|deck\.get\("theme"\)|data\.get\("theme"\)/,
    'the renderer reads the theme off the deck');
});

test('an unknown theme leaves the default rather than failing the render', () => {
  const renderer = read('scripts/render_pptx.py');
  const fn = renderer.slice(renderer.indexOf('def apply_theme'));
  assert.match(fn.slice(0, 400), /a deck rendering in the wrong colours beats a deck not rendering/);
});

test('a presentation that fell back to markdown slides still takes a theme', () => {
  // 28 of the 41 presentations in production had no structured deck, and for
  // every one of them "change template" answered that there was no layout to
  // change. The theme is a column now, and the markdown slide builder carries
  // it to the same renderer field a designed deck uses.
  const slideSpec = require('../src/utils/slideSpec');
  const spec = slideSpec.build('% Title\n% Author\n% 2026\n\n# One\n\n- a\n- b\n', { theme: 'ward-teal' });
  assert.equal(spec.theme, 'ward-teal');
  assert.equal(slideSpec.build('# One\n- a').theme, undefined, 'no theme asked for, none invented');
  const route = fs.readFileSync(path.join(__dirname, '..', 'src/routes/myResources.js'), 'utf8');
  assert.doesNotMatch(route, /has no slide layout, so it has no theme to change/);
  assert.match(route, /UPDATE user_resources SET theme = \?, deck = COALESCE\(\?::jsonb, deck\)/);
  assert.match(route, /deck: row\.deck, theme: row\.theme, figureIds/);
  const exporter = fs.readFileSync(path.join(__dirname, '..', 'src/utils/documentExport.js'), 'utf8');
  assert.match(exporter, /slideSpec\.build\(markdown, \{ images: images, theme: options\.theme \}\)/);
  assert.match(fs.readFileSync(path.join(__dirname, '..', 'migrations/1781200000000_resource-theme.js'), 'utf8'), /ADD COLUMN IF NOT EXISTS theme TEXT/);
});