// The image library: every picture this account generated, across all three
// features, with thumbnails rather than originals and a delete that removes the
// bytes and not only the row.
const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

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

test('the listing is the owner’s own finished images, newest first', () => {
  const route = read('src/routes/generatedImages.js');
  assert.match(route, /router\.get\('\/generated-images'/);
  // Scoped by owner in the statement, not filtered afterwards.
  assert.match(route, /owner_id=\$1 AND stage='done'/);
  assert.match(route, /ORDER BY created_at DESC/);
  // Unfinished jobs have nothing to show; listing one puts a broken frame in a
  // gallery.
  assert.match(route, /Only finished jobs/);
});

test('paging is keyset, not OFFSET', () => {
  // A gallery that grows while you scroll repeats or skips a row under OFFSET.
  const route = read('src/routes/generatedImages.js');
  assert.match(route, /created_at < \$/);
  assert.doesNotMatch(route, /\bOFFSET\s+\$?\d/i, 'no SQL OFFSET; the word in a comment is fine');
  assert.match(route, /nextBefore/);
});

test('a prompt that cannot be decrypted does not cost the gallery its picture', () => {
  const route = read('src/routes/generatedImages.js');
  assert.match(route, /try \{ prompt = String\(encryption\.decryptString/);
  assert.match(route, /catch \(e\) \{ prompt = ''; \}/);
});

test('deleting removes the bytes before the row, and refuses if it cannot', () => {
  // A row without its object is a broken image in a gallery; an object without
  // its row is only wasted space. Only one of those is allowed to happen.
  const lib = read('src/utils/generatedImages.js');
  assert.match(lib, /async function discard\(id, owner\)/);
  const discard = lib.slice(lib.indexOf('async function discard'));
  const storageFirst = discard.indexOf('getStorage().remove(id)');
  const rowSecond = discard.indexOf('DELETE FROM generated_image_jobs');
  assert.ok(storageFirst > -1 && rowSecond > storageFirst, 'storage must be removed first');
  assert.match(discard.slice(0, 800), /throw failure\(503, 'Image storage is unavailable; nothing was deleted'\)/);
});

test('deleting removes the previews too, not just the original', () => {
  // Both derived widths live under their own prefix. Missing them leaves paid-for
  // bytes in the bucket that are still readable.
  const storage = read('src/utils/generatedImageStorage.js');
  assert.match(storage, /async remove\(id\)/);
  assert.match(storage, /\['assets\/' \+ id\]\.concat\(THUMB_WIDTHS\.map/);
});

test('the thumbnail widths have one definition', () => {
  // Two copies drift: a width written but never deleted is paid for once and
  // then left in the bucket forever.
  const storage = read('src/utils/generatedImageStorage.js');
  const lib = read('src/utils/generatedImages.js');
  assert.match(storage, /const THUMB_WIDTHS = Object\.freeze\(\[256, 640\]\)/);
  assert.match(lib, /const \{ THUMB_WIDTHS \} = storageUtil/);
  assert.doesNotMatch(lib, /THUMB_WIDTHS = Object\.freeze/, 'not defined twice');
  assert.deepEqual(require('../src/utils/generatedImages').THUMB_WIDTHS, [256, 640]);
});

test('a borrowed id deletes nothing rather than someone else’s picture', () => {
  const route = read('src/routes/generatedImages.js');
  assert.match(route, /SELECT id FROM generated_image_jobs WHERE id=\$1 AND owner_id=\$2/);
  const lib = read('src/utils/generatedImages.js');
  assert.match(lib, /DELETE FROM generated_image_jobs WHERE id=\$1 AND owner_id=\$2/);
});

test('the grid asks for the stored preview, not the original', () => {
  // Thirty tiles at full size is thirty full-size downloads.
  const ui = read('public/js/myResources.js');
  assert.match(ui, /setAttribute\('data-image-thumb', '256'\)/);
  assert.match(ui, /hydrateImage\(img, image\.imageUrl\)/,
    'fetched through the authenticated loader, never a bare src');
});

test('the caption is a model-written prompt and never reaches the page as HTML', () => {
  const ui = read('public/js/myResources.js');
  const tile = ui.slice(ui.indexOf('function imageTile'), ui.indexOf('function openImage'));
  assert.match(tile, /text\.textContent = image\.prompt/);
  assert.doesNotMatch(tile, /innerHTML/);
});

test('the images tab loads on first open, not on page load', () => {
  // Most visits never open it, and it costs a query plus a thumbnail per tile.
  const ui = read('public/js/myResources.js');
  assert.match(ui, /if \(!docs && !imagesLoaded\) loadImages\(true\)/);
});