// The catalogue, checked where it actually lives: in a browser. A directory
// handle, IndexedDB, a grid of tiles and a handover into the studio have no
// meaning outside one, so this is a Playwright run rather than a pure-node
// assert.
//
// Only Chromium can hand a page a folder, and only a person can answer the
// picker. The check stands in for both: it serves two real frames (one JPEG, one
// RAW) off a local server and answers `showDirectoryPicker` with a folder made of
// them. The stand-in handles carry their methods as *non-enumerable* properties,
// which is what lets them go through IndexedDB's structured clone at all (a
// clone copies enumerable own keys and drops the rest, and a function anywhere
// else is a DataCloneError); the methods are put back where the catalogue reads
// them, because a cloned handle is a plain object with no `getFile`.
//
//   npm run build && node scripts/library-check.mjs
//   PLAYWRIGHT_CORE=<path to playwright-core/index.mjs> node scripts/library-check.mjs
//
// Playwright is not a dependency of this package (a browser run needs it, a
// build does not), so a run without it says SKIP and exits 0.
import { spawn } from 'node:child_process';
import { createServer } from 'node:http';
import { readFile } from 'node:fs/promises';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const FRONTEND = fileURLToPath(new URL('..', import.meta.url));
const SAMPLES = process.env.SAMPLE_DIR ?? path.resolve(FRONTEND, '..');
const APP_PORT = Number(process.env.APP_PORT ?? 4185);
const SAMPLE_PORT = Number(process.env.SAMPLE_PORT ?? 4319);
const JPG = 'P1010256.JPG';
const RAW = 'P1010256.RW2';

let failures = 0;
function step(name, ok, detail = '') {
  if (!ok) failures++;
  console.log(`${ok ? 'ok  ' : 'FAIL'} ${name}${detail ? ` — ${detail}` : ''}`);
  return ok;
}
// The mark each command of an open context menu leads with. Every command carries
// one of its own: a column of marks reads at a glance where a block of uppercase
// does not, and a mark the platform's fonts have no glyph for is a box.
const menuMarks = () =>
  page.$$eval('[data-key="lib-menu"] .lib-menu-item', (els) =>
    els.map((e) => (e.querySelector('.lib-menu-icon')?.textContent ?? '').trim())
  );
const marked = (marks) => marks.length > 0 && marks.every((m) => [...m].length === 1) && new Set(marks).size === marks.length;

const playwright = await import(process.env.PLAYWRIGHT_CORE ?? 'playwright-core').catch(() => null);
if (!playwright) {
  console.log('SKIP playwright-core is not installed — pass PLAYWRIGHT_CORE=<path to its index.mjs>');
  process.exit(0);
}

// --- the two frames, off a local server (the page fetches them by CORS) ------
const sampleServer = createServer(async (req, res) => {
  const name = path.basename(decodeURIComponent((req.url ?? '/').split('?')[0]));
  if (name !== JPG && name !== RAW) {
    res.writeHead(404).end();
    return;
  }
  const bytes = await readFile(path.join(SAMPLES, name));
  // A beat per frame: the catalogue reads two files faster than a poll, and the
  // ring that says "this roll is being read" needs a window to be caught in.
  await new Promise((resolve) => setTimeout(resolve, 250));
  res.writeHead(200, {
    'Content-Type': 'application/octet-stream',
    'Content-Length': bytes.length,
    'Access-Control-Allow-Origin': '*',
  });
  res.end(bytes);
});
await new Promise((resolve) => sampleServer.listen(SAMPLE_PORT, '127.0.0.1', resolve));

// `--host 127.0.0.1`: without it vite's preview binds the name `localhost`, which
// on a dual-stack box can be ::1 alone and every 127.0.0.1 fetch below fails.
const app = spawn('npx', ['vite', 'preview', '--port', String(APP_PORT), '--strictPort', '--host', '127.0.0.1'], {
  cwd: FRONTEND,
  stdio: 'ignore',
});
const base = `http://127.0.0.1:${APP_PORT}`;
let up = false;
for (let i = 0; i < 60 && !up; i++) {
  up = await fetch(`${base}/library`).then((r) => r.ok).catch(() => false);
  if (!up) await new Promise((r) => setTimeout(r, 500));
}
if (!up) {
  app.kill('SIGTERM');
  sampleServer.close();
  console.log(`FAIL no preview on ${base} — run \`npm run build\` first (vite preview serves dist/)`);
  process.exit(1);
}

// --- the browser ------------------------------------------------------------
const browser = await playwright.chromium.launch({
  // Playwright's own Chromium when it has one; CHROME points at any other.
  executablePath: process.env.CHROME || undefined,
  args: ['--no-sandbox', '--enable-unsafe-swiftshader', '--use-gl=angle', '--use-angle=swiftshader'],
});
const context = await browser.newContext();

// The folder the picker would have returned, plus the revival of its handles on
// the way back out of IndexedDB.
await context.addInitScript(
  ({ origin, names, subs, folder }) => {
    // A folder the browser will not let the page read is the one state a run of
    // its own has to ask for: the check sets the key, reloads, and the handles
    // come back refused.
    window.__deny = localStorage.getItem('check.deny') === '1';
    const bytes = new Map();
    const load = async (name) => {
      if (!bytes.has(name)) bytes.set(name, fetch(`${origin}/${name}`).then((r) => r.arrayBuffer()));
      return bytes.get(name);
    };
    // What a scan costs is the bytes it reads, so they are counted: a part cut
    // off a file remembers the file it came off, and every `arrayBuffer` call on
    // the whole or the part lands on that file's name. A frame the catalogue
    // already holds is left on its size and its write time without a byte of it
    // being read, which is the claim the run below makes.
    const reads = (window.__reads = {});
    const off = new WeakMap();
    const part = Blob.prototype.slice;
    Blob.prototype.slice = function (...args) {
      const cut = part.apply(this, args);
      off.set(cut, off.get(this) ?? this.name ?? '');
      return cut;
    };
    const pull = Blob.prototype.arrayBuffer;
    Blob.prototype.arrayBuffer = function () {
      const name = off.get(this) ?? this.name ?? '';
      if (name) reads[name] = (reads[name] ?? 0) + 1;
      return pull.apply(this);
    };
    const fileHandle = (name) => {
      const handle = { kind: 'file', name, __fake: true };
      Object.defineProperty(handle, 'getFile', {
        value: async () => {
          const gets = JSON.parse(sessionStorage.getItem('check.gets') ?? '{}');
          gets[name] = (gets[name] ?? 0) + 1;
          sessionStorage.setItem('check.gets', JSON.stringify(gets));
          // A reading caught in the middle of a frame: the check sets the key, the
          // scan stops on the frame it was reading, and the next visit — with the
          // key cleared — is the one that goes on.
          while (localStorage.getItem('check.hold') === '1') await new Promise((r) => setTimeout(r, 25));
          return new File([await load(name)], name, {
            type: name.endsWith('.JPG') ? 'image/jpeg' : 'application/octet-stream',
            // A real handle reports one write time for one file, and the same one
            // on every read; a fresh `Date.now()` per call would make every frame
            // look touched and hide what is being checked.
            lastModified: Date.UTC(2026, 0, 1),
          });
        },
      });
      return handle;
    };
    // The picked folder holds `names` at its top level and the subfolders in
    // `subs`, each `{ files, dirs }` — a roll really is a folder of dated
    // directories inside dated directories, which is what the tree column walks.
    // `__fake` on both kinds is what the revival below goes by: a handle that
    // comes back out of IndexedDB is a plain object with no methods on it, and a
    // folder that is not revived is a folder the screen has no permission for.
    const dirHandle = (label, node) => {
      const handle = { kind: 'directory', name: label, __fake: true };
      Object.defineProperties(handle, {
        values: {
          value: () => {
            // Every listing a reading asks for, counted across reloads: a reading
            // that starts over lists the same folder twice, and that is the one
            // thing on screen a reader reads as "it threw the catalogue away".
            const lists = JSON.parse(sessionStorage.getItem('check.lists') ?? '{}');
            lists[label] = (lists[label] ?? 0) + 1;
            sessionStorage.setItem('check.lists', JSON.stringify(lists));
            return [
              ...(node.files ?? []).map(fileHandle),
              ...Object.entries(node.dirs ?? {}).map(([name, kid]) => dirHandle(name, kid)),
            ][Symbol.iterator]();
          },
        },
        queryPermission: { value: async () => (window.__deny ? 'denied' : 'granted') },
        requestPermission: { value: async () => (window.__deny ? 'denied' : 'granted') },
        // A folder is asked for a child by name as often as it is listed: the
        // reading spells its queue as paths, and a path comes back as a handle
        // this way. A name that is not there is the error the browser gives.
        getDirectoryHandle: {
          value: async (name) => {
            const kid = node.dirs?.[name];
            if (!kid) throw new Error(`no folder named ${name}`);
            return dirHandle(name, kid);
          },
        },
        getFileHandle: {
          value: async (name) => {
            if (!(node.files ?? []).includes(name)) throw new Error(`no frame named ${name}`);
            return fileHandle(name);
          },
        },
      });
      return handle;
    };
    const root = () => dirHandle(folder, { files: names, dirs: subs });
    window.showDirectoryPicker = async () => root();

    const revive = (row) => {
      if (row?.handle?.__fake && !Object.getOwnPropertyDescriptor(row.handle, 'getFile')) {
        row.handle = row.handle.kind === 'directory' ? root() : fileHandle(row.handle.name);
      }
      return row;
    };
    for (const method of ['get', 'getAll']) {
      const original = IDBObjectStore.prototype[method];
      IDBObjectStore.prototype[method] = function (...args) {
        const request = original.apply(this, args);
        const descriptor = Object.getOwnPropertyDescriptor(IDBRequest.prototype, 'result');
        Object.defineProperty(request, 'result', {
          configurable: true,
          get() {
            const value = descriptor.get.call(this);
            return Array.isArray(value) ? value.map(revive) : revive(value);
          },
        });
        return request;
      };
    }
  },
  {
    origin: `http://127.0.0.1:${SAMPLE_PORT}`,
    names: [JPG],
    // One frame at the top, one a folder down, one two folders down: the walk has
    // to reach the bottom of the roll, not just its first level.
    // One folder down, one two deep, and one holding no frame the catalogue can
    // read: the walk names it long before there is a thumbnail for it.
    subs: {
      2026: { files: [RAW], dirs: { '04': { files: [JPG], dirs: {} } } },
      Empty: { files: ['notes.txt'], dirs: {} },
    },
    folder: 'CheckRoll',
  }
);

const page = await context.newPage();
const catalogue = () =>
  page.evaluate(async () => {
    const db = await new Promise((resolve, reject) => {
      const req = indexedDB.open('recipescam-library');
      req.onsuccess = () => resolve(req.result);
      req.onerror = () => reject(req.error);
    });
    const all = (store) =>
      new Promise((resolve, reject) => {
        const req = db.transaction(store).objectStore(store).getAll();
        req.onsuccess = () => resolve(req.result);
        req.onerror = () => reject(req.error);
      });
    const [photos, edits] = await Promise.all([all('photos'), all('edits')]);
    const thumbs = [];
    for (const photo of photos) {
      const head = photo.thumb ? new Uint8Array(await photo.thumb.slice(0, 2).arrayBuffer()) : null;
      thumbs.push({
        id: photo.id,
        bytes: photo.thumb?.size ?? 0,
        jpeg: head ? head[0] === 0xff && head[1] === 0xd8 : false,
      });
    }
    return { thumbs, edits: edits.map((e) => ({ id: e.photoId, filter: e.recipe?.baseFilter, knobs: Object.keys(e.recipe?.adjustments ?? {}).length })) };
  });

// --- the run ----------------------------------------------------------------
await page.goto(`${base}/library`);
await page.click('[data-key="lib-add"]');
// A folder that is being read says so on its own row, not only in the toolbar.
const ringed = await page
  .waitForFunction(
    () => {
      const row = document.querySelector('.adm-album[aria-busy="true"]');
      return row?.querySelector('.lib-spin') ? row.dataset.key : null;
    },
    null,
    { timeout: 10_000, polling: 50 }
  )
  .then((handle) => handle.jsonValue())
  .catch(() => null);
step('the folder being read turns a ring on its row', ringed === 'lib-node-CheckRoll', String(ringed));
const thumbs = '[data-key^="lib-thumb-"]';
await page.waitForSelector(thumbs, { timeout: 120_000 });
await page.waitForFunction((sel) => document.querySelectorAll(sel).length === 3, thumbs, { timeout: 120_000 });
step('every frame of the roll is indexed, two folders down', true, `3 tiles from ${JPG} ×2 + ${RAW}`);

const indexed = await catalogue();
for (const name of [JPG, RAW]) {
  const row = indexed.thumbs.find((t) => t.id.endsWith(`/${name}`));
  step(`thumbnail for ${name}`, !!row && row.bytes > 1000 && row.jpeg, `${row?.bytes ?? 0} bytes, jpeg=${row?.jpeg}`);
}

// The tree: the picked folder, with the subfolder a frame sits in under it, each
// carrying the frames at or below it. The RAW is the nested one.
const nodes = await page.$$eval('[data-key^="lib-node-"]', (els) =>
  els.map((e) => [e.dataset.key, e.querySelector('.adm-album-count')?.textContent])
);
step(
  'the tree draws the roll as folders under folders',
  JSON.stringify(nodes) ===
    JSON.stringify([
      ['lib-node-CheckRoll', '3'],
      ['lib-node-CheckRoll/2026', '2'],
      ['lib-node-CheckRoll/2026/04', '1'],
      // Named by the walk, counted by nothing: a row before a frame.
      ['lib-node-CheckRoll/Empty', '0'],
    ]),
  JSON.stringify(nodes)
);

// A row with children folds its subtree on the same click that opens it, and the
// frames it holds stay in the strip — the tree narrows, the pictures do not.
await page.click('[data-key="lib-node-CheckRoll"]');
await page.waitForFunction(() => document.querySelectorAll('[data-key^="lib-node-"]').length === 1, null, {
  timeout: 10_000,
  polling: 50,
});
const foldedThumbs = await page.$$eval(thumbs, (els) => els.length);
const foldedMeta = await page.locator('[data-key="lib-stage-meta"]').innerText();
const shut = await page.getAttribute('[data-key="lib-node-CheckRoll"]', 'aria-expanded');
step(
  'a folder folds its subtree and keeps its frames in the strip',
  foldedThumbs === 3 && shut === 'false' && /P1010256/.test(foldedMeta),
  `${foldedThumbs} tiles, aria-expanded=${shut}, stage ${foldedMeta.split('\n')[0]}`
);
await page.click('[data-key="lib-node-CheckRoll"]');
await page.waitForFunction(() => document.querySelectorAll('[data-key^="lib-node-"]').length === 4, null, {
  timeout: 10_000,
  polling: 50,
});
step('the same click draws it open again', true, '4 rows');

// Show subfolders or not: the strip follows the open folder alone, or the whole
// branch under it. The switch is the reader's and the tree does not change with
// it — folding is about rows, this is about frames.
await page.click('[data-key="lib-subs"]');
await page.waitForFunction((sel) => document.querySelectorAll(sel).length === 1, thumbs, { timeout: 10_000, polling: 50 });
const shallow = await page.$$eval('[data-key^="lib-node-"]', (els) => els.length);
const shallowStage = await page.locator('[data-key="lib-stage-meta"]').innerText();
step(
  'the switch leaves the open folder its own frames',
  shallow === 4 && /P1010256\.JPG/.test(shallowStage),
  `${shallow} rows, stage ${shallowStage.split('\n')[0]}`
);
await page.click('[data-key="lib-subs"]');
await page.waitForFunction((sel) => document.querySelectorAll(sel).length === 3, thumbs, { timeout: 10_000, polling: 50 });
step('and puts the branch back', true, '3 tiles from the roll below');

// A folder the walk named and the catalogue found nothing in: the row is there,
// the strip says so rather than drawing nothing at all.
await page.click('[data-key="lib-node-CheckRoll/Empty"]');
await page.waitForFunction(() => document.querySelector('.adm-filmstrip .adm-row-empty') !== null, null, {
  timeout: 10_000,
  polling: 50,
});
const emptyThumbs = await page.$$eval(thumbs, (els) => els.length);
const emptyHint = await page.$eval('.adm-filmstrip .adm-row-empty', (e) => e.textContent);
step(
  'a folder the walk named but holds no frame draws an empty strip',
  emptyThumbs === 0 && /chưa có ảnh|nothing in this folder/i.test(emptyHint ?? ''),
  `${emptyThumbs} tiles, "${emptyHint}"`
);
// Back to the roll: the first click folds it on the way, so it takes two.
await page.click('[data-key="lib-node-CheckRoll"]');
await page.waitForFunction(() => document.querySelectorAll('[data-key^="lib-node-"]').length === 1, null, {
  timeout: 10_000,
  polling: 50,
});
await page.click('[data-key="lib-node-CheckRoll"]');
await page.waitForFunction((sel) => document.querySelectorAll(sel).length === 3, thumbs, {
  timeout: 10_000,
  polling: 50,
});
step('and the roll comes back with its frames', true, '3 tiles');

// Opening the subfolder redraws the strip and the frame above it.
await page.click('[data-key="lib-node-CheckRoll/2026"]');
await page.waitForFunction((sel) => document.querySelectorAll(sel).length === 2, thumbs, { timeout: 30_000 });
const staged = await page.locator('[data-key="lib-stage-meta"]').innerText();
step('the open subfolder draws its own strip and frame', /P1010256\.(RW2|JPG)/.test(staged), staged.replace(/\n/g, ' · '));

// The switch: the middle becomes every thumbnail of the open node at once.
await page.click('[data-key="lib-view-grid"]');
await page.waitForSelector('[data-key^="lib-photo-"]', { timeout: 30_000 });
const cards = await page.$$eval('[data-key^="lib-photo-"]', (els) => els.map((e) => e.dataset.key));
step('the grid view draws a card per frame', cards.length === 2, JSON.stringify(cards));
await page.click('[data-key="lib-view-preview"]');
await page.waitForSelector(thumbs, { timeout: 30_000 });

// The toolbar carries the screen's one button and the two view icons on a single
// row; a folder's own rescan and remove exist only once it has been right-clicked.
const bar = await page.$eval('.lib-bar', (el) => ({
  rows: new Set(
    [...el.children].map((c) => {
      const box = c.getBoundingClientRect();
      return Math.round(box.top + box.height / 2);
    })
  ).size,
  icons: [...el.querySelectorAll('[data-key^="lib-view-"]')].every((b) => b.querySelector('svg')),
}));
step('one toolbar row holding the two view icons', bar.rows === 1 && bar.icons, JSON.stringify(bar));
step('no rescan/remove button in the pane', (await page.$$('[data-key^="lib-rescan-"], [data-key^="lib-drop-"]')).length === 0);

await page.click('[data-key="lib-node-CheckRoll/2026"]', { button: 'right' });
await page.waitForSelector('[data-key="lib-menu"]', { timeout: 10_000 });
const menu = await page.$$eval('[data-key="lib-menu"] button', (els) => els.map((b) => b.dataset.key));
step('a right click on a folder opens its menu', menu.join(',') === 'lib-rename-CheckRoll,lib-rescan-CheckRoll,lib-drop-CheckRoll', JSON.stringify(menu));
// Every command leads with a mark of its own, the way the tool rail and the view
// switch do: a column of marks reads at a glance where a block of uppercase does
// not, and a mark that is not in the font the platform ships is a box.
const marks = await menuMarks();
step(
  'every command in the folder menu leads with its own mark',
  marks.length === menu.length && marked(marks),
  JSON.stringify(marks)
);
await page.keyboard.press('Escape');
step('escape closes the menu', (await page.$('[data-key="lib-menu"]')) === null);

// The column is names and counts, nothing else: the count rides on the row.
const column = await page.$eval('[data-key="lib-tree"]', (el) => Math.round(el.getBoundingClientRect().width));
step(
  'no FOLDERS heading, the count on the folder row',
  (await page.$$('.adm-row-title')).length === 0 && (await page.$eval('[data-key="lib-node-CheckRoll"] .adm-album-count', (e) => e.textContent)) === '3',
  `${column}px column, stage ${await page.$eval('[data-key="lib-stage"]', (e) => Math.round(e.getBoundingClientRect().width))}px`
);
step('the folder column stays out of the stage\'s way', column <= 130, `${column}px`);

// A rename paints a label over the folder: the row it belongs to, and the frames
// under it, do not move — the node key is still the directory's own name.
page.once('dialog', (dialog) => dialog.accept('Roll A'));
await page.click('[data-key="lib-node-CheckRoll"]', { button: 'right' });
await page.waitForSelector('[data-key="lib-rename-CheckRoll"]', { timeout: 10_000 });
await page.click('[data-key="lib-rename-CheckRoll"]');
await page.waitForFunction(() => document.querySelector('[data-key="lib-node-CheckRoll"] .adm-album-name')?.textContent === 'Roll A', null, {
  timeout: 10_000,
});
step(
  'a folder can be renamed without being moved',
  (await page.$('[data-key="lib-node-CheckRoll/2026"]')) !== null,
  await page.$eval('[data-key="lib-node-CheckRoll"] .adm-album-name', (e) => e.textContent)
);
// The folder's name is the row's, said once: a heading over the column would only
// repeat it, and that heading would outlive the rows when the tree is folded.
step(
  'the folder is named on its row and nowhere over the column',
  (await page.$$('[data-key="lib-root-name"], .lib-col-title')).length === 0 &&
    (await page.$eval('[data-key="lib-node-CheckRoll"] .adm-album-name', (e) => e.textContent)) === 'Roll A'
);

// The empty part of the column is where one more folder comes from.
await page.click('[data-key="lib-tree"]', { button: 'right', position: { x: 10, y: 200 } });
await page.waitForSelector('[data-key="lib-menu"]', { timeout: 10_000 });
const blank = await page.$$eval('[data-key="lib-menu"] button', (els) => els.map((b) => b.dataset.key));
step('a right click on the empty column offers a folder', blank.join(',') === 'lib-menu-add', JSON.stringify(blank));
const blankMarks = await menuMarks();
step('and that one command carries its mark too', blankMarks.length === 1 && marked(blankMarks), JSON.stringify(blankMarks));
await page.keyboard.press('Escape');
step('escape closes the folder menu too', (await page.$('[data-key="lib-menu"]')) === null);

// The head of the tree is the whole tree's control: a right click on the row of a
// folder picked at the top level folds the folders nested below the top level. The
// top-level row itself stays open — one click on its name already shuts it, so the
// menu item would only repeat that click — and
// the frames in the strip are the strip's business and do not move with the rows.
// The subfolder opened above carries a fold of its own, so it is opened first:
// the claim is what ONE click does to every row at once, not to one already shut.
await page.click('[data-key="lib-node-CheckRoll/2026"]');
await page.waitForFunction(() => document.querySelectorAll('[data-key^="lib-node-"]').length === 4, null, {
  timeout: 10_000,
  polling: 50,
});
const deepRows = await page.$$eval('[data-key^="lib-node-"]', (els) => els.length);
const deepTiles = await page.$$eval(thumbs, (els) => els.length);
// The row is where a reader right-clicks, so fold-the-tree leads that row's menu.
await page.click('[data-key="lib-node-CheckRoll"]', { button: 'right' });
await page.waitForSelector('[data-key="lib-menu"]', { timeout: 10_000 });
const rowMenu = await page.$$eval('[data-key="lib-menu"] button', (els) => els.map((b) => b.dataset.key));
step(
  'a right click on the top-level folder row offers to fold the tree',
  rowMenu.join(',') === 'lib-menu-collapse,lib-rename-CheckRoll,lib-rescan-CheckRoll,lib-drop-CheckRoll',
  JSON.stringify(rowMenu),
);
const rowMarks = await menuMarks();
step('and its four commands each lead with a mark of their own', rowMarks.length === 4 && marked(rowMarks), JSON.stringify(rowMarks));
await page.click('[data-key="lib-menu-collapse"]');
await page.waitForFunction(() => document.querySelectorAll('[data-key^="lib-node-"]').length === 3, null, {
  timeout: 10_000,
  polling: 50,
});
const flatTiles = await page.$$eval(thumbs, (els) => els.length);
const ended = await page.$$eval('[data-key^="lib-node-"]', (els) =>
  els.map((e) => `${e.dataset.key}:${e.getAttribute('aria-expanded') ?? '-'}`)
);
step(
  'and one click folds the subfolders, leaving the top-level row open',
  deepRows === 4 &&
    flatTiles === deepTiles &&
    ended.join(' ') === 'lib-node-CheckRoll:true lib-node-CheckRoll/2026:false lib-node-CheckRoll/Empty:-',
  `${deepRows} rows → ${ended.length}, ${ended.join(' ')}, ${flatTiles} tiles kept`,
);

// The divider drags the column, and what the visit leaves behind — the width the
// column was left at and the folder that was open — is what the next visit opens
// with. The right click on the empty column answered with a folder, not with a
// folder opened, so the open node is still the subfolder chosen above.
const gripBox = await (await page.$('[data-key="lib-grip"]')).boundingBox();
await page.mouse.move(gripBox.x + 4, gripBox.y + 120);
await page.mouse.down();
await page.mouse.move(gripBox.x + 84, gripBox.y + 120, { steps: 6 });
await page.mouse.up();
const dragged = await page.$eval('[data-key="lib-tree"]', (el) => Math.round(el.getBoundingClientRect().width));
await page.reload();
await page.waitForSelector(thumbs, { timeout: 120_000 });
const reopened = await page.$eval('[data-key="lib-tree"]', (el) => Math.round(el.getBoundingClientRect().width));
const where = await page.$eval('[data-key^="lib-node-"][aria-current="true"]', (e) => e.dataset.key);
step('the column drags and is the same width next time', dragged >= 160 && reopened === dragged, `${dragged}px, then ${reopened}px`);
step('the screen reopens on the folder it was left on', where === 'lib-node-CheckRoll/2026', where);

// The frame that was raised is remembered too: a reader who comes back finds the
// negative they were looking at, not the first one the node happens to hold. The
// JPEG is the one with a picture to show, so it is the one that gets raised.
const jpgId = indexed.thumbs.find((t) => t.id.endsWith(`/${JPG}`) && t.id.includes('/2026/04/')).id;
await page.click(`[data-key="lib-thumb-${jpgId}"]`);
await page.reload();
await page.waitForSelector(thumbs, { timeout: 120_000 });
const raised = await page.$eval('.adm-thumb.on', (e) => e.dataset.key);
step('the screen reopens on the frame that was raised', raised === `lib-thumb-${jpgId}`, raised);

// A wheel tick over the frame magnifies it about the point under the pointer —
// the one gesture that makes a negative worth the whole window. The page under it
// holds still, and ticking back down fits the frame again.
const shotBox = await (await page.$('[data-key="lib-stage-img"]')).boundingBox();
await page.mouse.move(shotBox.x + shotBox.width / 3, shotBox.y + shotBox.height / 3);
await page.mouse.wheel(0, -240);
await page.waitForTimeout(150);
const magnified = await page.$eval('[data-key="lib-stage-img"]', (el) => ({
  transform: getComputedStyle(el).transform,
  origin: getComputedStyle(el).transformOrigin,
}));
await page.mouse.wheel(0, 600);
await page.waitForTimeout(150);
const fitted = await page.$eval('[data-key="lib-stage-img"]', (el) => getComputedStyle(el).transform);
const scale = Number((magnified.transform.match(/matrix\(([\d.]+)/) ?? [])[1] ?? 1);
step(
  'a wheel tick over the frame zooms it, and back down fits it again',
  scale > 1 && scale <= 6 && fitted === 'none',
  `${magnified.transform} about ${magnified.origin} → ${fitted}`
);

// One tap on a thumbnail raises the frame, and the button under it hands it to
// the studio. The RAW is the harder half — it has to be read back off the
// (stand-in) handle and developed — so it is the one that gets opened.
const rawId = indexed.thumbs.find((t) => t.id.endsWith(`/${RAW}`)).id;
await page.click(`[data-key="lib-thumb-${rawId}"]`);
await page.click('[data-key="lib-open"]');
await page.waitForURL((url) => url.pathname.startsWith('/app'), { timeout: 120_000 });
await page.waitForFunction(() => !document.querySelector('.dropzone'), null, { timeout: 180_000 });
step('studio developed the frame from its handle', true, 'stage no longer on the drop zone');

// The handover is an address, not a state: the studio puts the frame into its
// own store and drops the query, so a reload reopens it like any other photo.
step('the address was handed back', !page.url().includes('lib='), `url=${page.url()}`);

// Two things a reader and an operator read straight off the header: the preset
// the studio has open wears the theme's accent (the same colour the brand and
// the open tab carry), and the rail's foot names the build this page came from.
await page.waitForSelector('.rail-version', { timeout: 15_000 });
const chrome = await page.evaluate(() => ({
  version: document.querySelector('.rail-version')?.textContent?.trim() ?? '',
  recipe: getComputedStyle(document.querySelector('.recipe-name')).color,
  accent: getComputedStyle(document.querySelector('.brand em')).color,
}));
step(
  'the rail foot names the build the page came from',
  /^\d+\.\d+\.\d+\+\S+$/.test(chrome.version),
  chrome.version
);
step(
  'the preset chip in the header wears the theme accent, not a fixed grey',
  chrome.recipe === chrome.accent,
  `${chrome.recipe}, brand accent ${chrome.accent}`
);

const editsIn = () =>
  page.evaluate(async () => {
    const db = await new Promise((resolve, reject) => {
      const req = indexedDB.open('recipescam-library');
      req.onsuccess = () => resolve(req.result);
      req.onerror = () => reject(req.error);
    });
    return await new Promise((resolve) => {
      const req = db.transaction('edits').objectStore('edits').getAll();
      req.onsuccess = () => resolve(req.result);
    });
  });
// The recipe is written 600ms after the last change (a slider drag fires it per
// frame), so the row arrives a beat after the frame does.
let filed = [];
for (let i = 0; i < 40 && !filed.length; i++) {
  filed = await editsIn();
  if (!filed.length) await new Promise((r) => setTimeout(r, 250));
}
step('the look was filed back against the frame', filed.length === 1, JSON.stringify(filed));

await page.goto(`${base}/library`);
await page.waitForSelector(`[data-key="lib-thumb-${rawId}"]`);
await page.click(`[data-key="lib-thumb-${rawId}"]`);
const meta = await page.locator('[data-key="lib-stage-meta"]').innerText();
step('the frame says it was edited', /đã chỉnh|edited/.test(meta), meta.replace(/\n/g, ' · '));

// The strip is a shelf, not a page: when the open folder holds more frames than
// fit, a plain wheel tick over it walks them along — a wheel has no sideways
// axis to scroll a row with. The window is narrowed until the three tiles of the
// open roll no longer fit, which is what a long roll looks like anyway.
await page.click('[data-key="lib-node-CheckRoll"]');
await page.waitForFunction((sel) => document.querySelectorAll(sel).length === 3, thumbs, { timeout: 30_000 });
await page.setViewportSize({ width: 320, height: 720 });
await page.waitForTimeout(200);
const shelf = await page.$eval('[data-key="lib-strip"]', (el) => ({ sw: el.scrollWidth, cw: el.clientWidth }));
const shelfBox = await (await page.$('[data-key="lib-strip"]')).boundingBox();
await page.mouse.move(shelfBox.x + shelfBox.width / 2, shelfBox.y + shelfBox.height / 2);
await page.mouse.wheel(0, 200);
await page.waitForTimeout(300);
const walked = await page.$eval('[data-key="lib-strip"]', (el) => el.scrollLeft);
step('a wheel tick walks the strip along', shelf.sw > shelf.cw && walked > 0, `${shelf.sw}px of tiles in ${shelf.cw}px, scrolled to ${walked}`);

// A catalogue another tab has open — the tab that is still running yesterday's
// build, holding the connection the new build used to ask for a version on. The
// screen has to come up on it: the catalogue is opened as it is, with no version
// to reach for and nothing for the other tab to block.
const hold = await context.newPage();
await hold.route('**/assets/*.js', (r) => r.abort());
await hold.goto(`${base}/library`).catch(() => {});const held = await hold.evaluate(
  () =>
    new Promise((resolve, reject) => {
      const req = indexedDB.open('recipescam-library');
      req.onsuccess = () => {
        window.__held = req.result;
        resolve(req.result.version);
      };
      req.onerror = () => reject(req.error);
    })
);
await page.setViewportSize({ width: 1280, height: 720 });
await page.goto(`${base}/library`);
await page.waitForSelector('[data-key="lib-node-CheckRoll"]', { timeout: 30_000 });
const seenAgain = await page.$$eval(thumbs, (els) => els.length);
step(
  'a catalogue another tab is holding still comes up',
  held >= 1 && seenAgain === 3,
  `held at version ${held}, ${seenAgain} tiles on the other tab`
);

// A reading that was cut short — the app closed, the tab was gone — is finished by
// the next visit with no one asking for it: the walk starts on the way in, the
// frame the catalogue still holds is left on its size and its write time, and the
// two it never got to are read. Two rows are taken out to stand for a scan that
// stopped before it reached them.
await page.evaluate(async (keep) => {
  const db = await new Promise((resolve, reject) => {
    const req = indexedDB.open('recipescam-library');
    req.onsuccess = () => resolve(req.result);
    req.onerror = () => reject(req.error);
  });
  const rows = await new Promise((resolve) => {
    const req = db.transaction('photos').objectStore('photos').getAll();
    req.onsuccess = () => resolve(req.result);
  });
  await new Promise((resolve, reject) => {
    const tx = db.transaction('photos', 'readwrite');
    for (const row of rows) if (!row.name.endsWith(keep)) tx.objectStore('photos').delete(row.id);
    tx.oncomplete = () => resolve();
    tx.onerror = () => reject(tx.error);
  });
}, RAW);
await page.reload();
await page
  .waitForFunction((n) => document.querySelectorAll('[data-key^="lib-thumb-"]').length === n, 3, { timeout: 60_000, polling: 50 })
  .catch(() => {});
const restored = await page.$$eval(thumbs, (els) => els.length).catch(() => 0);
const read = await page.evaluate(() => window.__reads ?? {});
step(
  'an interrupted reading goes on by itself, over the frames it still holds',
  restored === 3 && !read[RAW] && read[JPG] > 0,
  `${restored} tiles, ${JSON.stringify(read)}`
);

// The last of the six marks is the one only a folder whose permission has lapsed
// ever shows — and the one command that can do anything about it. The folder comes
// back refused, offers its way back, and takes it.
await page.evaluate(() => localStorage.setItem('check.deny', '1'));
await page.reload();
await page.waitForSelector('[data-key="lib-node-CheckRoll"]', { timeout: 30_000 });
await page.click('[data-key="lib-node-CheckRoll"]', { button: 'right' });
await page.waitForSelector('[data-key="lib-reconnect-CheckRoll"]', { timeout: 10_000 });
const refused = await page.$$eval('[data-key="lib-menu"] button', (els) => els.map((b) => b.dataset.key));
const refusedMarks = await menuMarks();
step(
  'a folder the browser refuses offers the one command that answers it, marked',
  refused.join(',') === 'lib-menu-collapse,lib-reconnect-CheckRoll' && marked(refusedMarks) && refusedMarks[1] === '⚿',
  `${JSON.stringify(refused)} ${JSON.stringify(refusedMarks)}`
);
await page.evaluate(() => localStorage.removeItem('check.deny'));
await page.evaluate(() => (window.__deny = false));
await page.click('[data-key="lib-reconnect-CheckRoll"]');
await page
  .waitForFunction(() => document.querySelectorAll('[data-key^="lib-thumb-"]').length === 3, null, { timeout: 60_000, polling: 50 })
  .catch(() => {});
step('and taking it reads the folder again', (await page.$$eval(thumbs, (els) => els.length)) === 3);

// A reload in the middle of a reading — the reader holding Ctrl+Shift+R over a
// roll of a few thousand frames, which is the one thing they do while a reading
// runs. The catalogue holds the frames the reading got through, but the reading's
// own position is not in the catalogue: without it the walk starts at the top of
// the roll again, every folder is listed a second time, and the counter starts
// from zero while the frames it already holds are read again to be skipped.
//
// The position belongs to the tab now, so the reading carries on instead of
// starting over. `check.hold` stops the reading on the frame it is reading, which
// is where a reload lands — and the reading it left behind is still there when the
// key goes, so the same reading finishes the roll. Everything is taken out of the
// catalogue first, so the reading has frames on both sides of the reload.
await page.evaluate(async () => {
  sessionStorage.clear();
  localStorage.setItem('check.hold', '1');
  const db = await new Promise((resolve, reject) => {
    const req = indexedDB.open('recipescam-library');
    req.onsuccess = () => resolve(req.result);
    req.onerror = () => reject(req.error);
  });
  await new Promise((resolve, reject) => {
    const tx = db.transaction('photos', 'readwrite');
    tx.objectStore('photos').clear();
    tx.oncomplete = () => resolve();
    tx.onerror = () => reject(tx.error);
  });
});
// The position the tab is holding, the line the toolbar reads out, and the wait
// for it: the line is how far the reading has come, and it is the one thing on
// screen that says whether a reading started over.
const position = () => page.evaluate(() => JSON.parse(sessionStorage.getItem('recipescam.library.walk.CheckRoll') ?? 'null'));
const readout = () => page.$eval('[data-key="lib-progress"]', (e) => e.textContent ?? '').catch(() => '');
const counting = () =>
  page.waitForFunction(
    () => /\d+\/\d+/.test(document.querySelector('[data-key="lib-progress"]')?.textContent ?? ''),
    null,
    { timeout: 30_000, polling: 50 }
  );
await page.reload();
await counting().catch(() => {});
const stopped = await readout();
await page.reload();
await counting().catch(() => {});
const resumed = await readout();
const at = await position();
step(
  'a reading a reload cut in half goes on from where it was',
  /\d+\/\d+/.test(stopped) && resumed === stopped && at?.walked.length === 4 && at.pending.length === 0 && at.frames.length === 3,
  `stopped at "${stopped.trim()}", back at "${resumed.trim()}", position ${JSON.stringify(at && { walked: at.walked.length, pending: at.pending.length, frames: at.frames.length })}`
);

// The key goes, and the reading the reload interrupted finishes the roll on its
// own: the frames it had found are read, the folders are not listed again — the
// check counts every listing a reading asks for, across reloads — and the position
// is dropped once there is nothing left to carry on from.
await page.evaluate(() => localStorage.removeItem('check.hold'));
await page
  .waitForFunction(() => document.querySelectorAll('[data-key^="lib-thumb-"]').length === 3, null, { timeout: 60_000, polling: 50 })
  .catch(() => {});
const carried = await page.$$eval(thumbs, (els) => els.length).catch(() => 0);
const again = await page.evaluate(() => JSON.parse(sessionStorage.getItem('check.lists') ?? '{}'));
step(
  'and it finishes the roll without listing a folder twice',
  carried === 3 && again.CheckRoll === 1 && again['2026'] === 1 && again.Empty === 1 && again['04'] === 1 && (await position()) === null,
  `${carried} tiles, folders listed ${JSON.stringify(again)}`
);

await browser.close();
sampleServer.close();
app.kill('SIGTERM');
console.log(failures ? `\n${failures} failed` : '\nall checks passed');
process.exit(failures ? 1 : 0);