import assert from 'node:assert/strict';
import { beforeEach, test } from 'node:test';
import { click, field, find, input, install, nodes, server, settle } from './flow-helpers.mjs';

const { app, toasts } = install();
const SORT_KEY = 'bindery.story-sort';
beforeEach(() => {
  const values = new Map();
  window.localStorage = {
    getItem: (key) => values.get(key) ?? null,
    setItem: (key, value) => values.set(key, value),
  };
  toasts.replaceChildren();
});
const { storiesPage } = await import('../../bindery/static/js/stories.js');
const { refreshJobs, startPolling, stopPolling } = await import('../../bindery/static/js/jobs.js');
const { fmtDate } = await import('../../bindery/static/js/lib.js');

// The server gives each story its sort key: the title in lower case, without a leading article.
const story = (id, title, changes = {}) => ({
  id, title, url: `https://example.com/${id}`,
  sort_title: (title || `https://example.com/${id}`).trim().replace(/^(?:the|an?)\s+/i, '').toLowerCase(),
  author: 'Reader', site: 'example.com',
  chapter_count: 42, offsite_count: 0, revised_count: 0, status: 'ok', message: 'No changes',
  last_changed: null, last_checked: null, ...changes,
});
const rows = () => {
  const table = nodes(app).find((el) => el.className === 'table-wrap stories-table');
  return nodes(table).find((el) => el.tagName === 'tbody').children;
};
const titles = () => rows().map((row) => row.children[0].textContent);
const cell = (row, label) => row.children.find((el) => el.attributes['data-label'] === label);
const heading = (label) => nodes(app).find((el) => el.tagName === 'th' && el.textContent === label);

async function mount(t, list) {
  const backend = server(t);
  backend.on('GET', 'stories', list);
  backend.on('GET', 'jobs', []);
  const cleanup = storiesPage(app, {}, { library_available: false, main_jobs_hours: 24, main_jobs_count: 10 });
  t.after(() => { cleanup(); stopPolling(); });
  await settle();
  return backend;
}

test('column headings toggle sorting, with newest dates first and missing dates always last', async (t) => {
  const backend = await mount(t, [
    story(3, 'Gamma', { last_changed: '2026-01-01T12:00:00Z', last_checked: '2026-01-03T12:00:00Z' }),
    story(2, 'Beta', { last_changed: '2026-01-02T12:00:00Z', last_checked: '2026-01-02T12:00:00Z' }),
    story(4, 'No date'),
    story(1, 'Alpha', { last_changed: '2026-01-03T12:00:00Z', last_checked: '2026-01-01T12:00:00Z' }),
  ]);
  assert.equal(field(app, 'Sort stories by'), undefined);
  assert.equal(heading('Title').attributes['aria-sort'], 'ascending');
  assert.equal(heading('Last change').attributes['aria-sort'], 'none');
  assert.deepEqual(titles(), ['Alpha', 'Beta', 'Gamma', 'No date']);
  assert.equal(find(app, 'button', 'Last change').attributes['aria-label'], 'Sort by last change, newest first');
  await click(app, 'Last change');
  assert.deepEqual(titles(), ['Alpha', 'Beta', 'Gamma', 'No date']);
  assert.equal(heading('Title').attributes['aria-sort'], 'none');
  assert.equal(heading('Last change').attributes['aria-sort'], 'descending');
  assert.equal(document.activeElement, find(app, 'button', 'Last change'));
  assert.equal(find(app, 'button', 'Last change').attributes['aria-label'], 'Sort by last change, oldest first');
  await click(app, 'Last change');
  assert.deepEqual(titles(), ['Gamma', 'Beta', 'Alpha', 'No date']);
  assert.equal(heading('Last change').attributes['aria-sort'], 'ascending');
  await click(app, 'Last check');
  assert.deepEqual(titles(), ['Gamma', 'Beta', 'Alpha', 'No date']);
  assert.equal(heading('Last check').attributes['aria-sort'], 'descending');
  await click(app, 'Last check');
  assert.deepEqual(titles(), ['Alpha', 'Beta', 'Gamma', 'No date']);
  assert.equal(heading('Last check').attributes['aria-sort'], 'ascending');
  await click(app, 'Title');
  assert.deepEqual(titles(), ['Alpha', 'Beta', 'Gamma', 'No date']);
  await click(app, 'Title');
  assert.deepEqual(titles(), ['No date', 'Gamma', 'Beta', 'Alpha']);
  assert.equal(heading('Title').attributes['aria-sort'], 'descending');
  await click(app, 'Last change');
  assert.deepEqual(titles(), ['Alpha', 'Beta', 'Gamma', 'No date']);
  assert.equal(backend.sent('GET', 'stories').length, 1);
});

test('title sorting and tie breaks keep ignoring leading articles', async (t) => {
  await mount(t, ['The Zebra', 'an Owl', 'Anthem', 'A Bee', 'Theory', 'Cat'].map((title, i) => story(i + 1, title)));
  const order = ['Anthem', 'A Bee', 'Cat', 'an Owl', 'Theory', 'The Zebra'];
  assert.deepEqual(titles(), order);
  await click(app, 'Title');
  assert.deepEqual(titles(), [...order].reverse());
  await click(app, 'Chapters');
  assert.deepEqual(titles(), order);
});

test('chapter sorting compares counts numerically and keeps equal counts in title order', async (t) => {
  await mount(t, [
    story(1, 'Zeta', { chapter_count: 2, offsite_count: 2, revised_count: 1 }),
    story(2, 'Alpha', { chapter_count: 10 }),
    story(3, 'Beta', { chapter_count: 10 }),
    story(4, 'Gamma', { chapter_count: 0 }),
    story(5, 'Omega', { chapter_count: 100 }),
  ]);
  assert.equal(find(app, 'button', 'Chapters').attributes['aria-label'], 'Sort by chapters, most first');
  await click(app, 'Chapters');
  assert.deepEqual(titles(), ['Omega', 'Alpha', 'Beta', 'Zeta', 'Gamma']);
  assert.equal(heading('Chapters').attributes['aria-sort'], 'descending');
  await click(app, 'Chapters');
  assert.deepEqual(titles(), ['Gamma', 'Zeta', 'Alpha', 'Beta', 'Omega']);
  assert.equal(heading('Chapters').attributes['aria-sort'], 'ascending');
});

for (const [label, key] of [['Author', 'author'], ['Site', 'site'], ['Status', 'status']]) {
  test(`${label} sorts alphabetically in either direction and uses titles to break ties`, async (t) => {
    await mount(t, [
      story(1, 'Zeta', { [key]: 'ok' }),
      story(3, 'Beta', { [key]: 'error' }),
      story(2, 'Alpha', { [key]: 'ERROR' }),
      story(4, 'Gamma', { [key]: null }),
      story(5, 'Omega', { [key]: 'queued' }),
    ]);
    await click(app, label);
    assert.deepEqual(titles(), ['Gamma', 'Alpha', 'Beta', 'Zeta', 'Omega']);
    assert.equal(heading(label).attributes['aria-sort'], 'ascending');
    await click(app, label);
    assert.deepEqual(titles(), ['Omega', 'Zeta', 'Alpha', 'Beta', 'Gamma']);
    assert.equal(heading(label).attributes['aria-sort'], 'descending');
  });
}

test('sorting saves the column and direction and restores both when the list reopens', async (t) => {
  const list = [
    story(1, 'Alpha', { author: 'Zed', site: 'z.test', status: 'ok', chapter_count: 2,
      last_changed: '2026-01-01T00:00:00Z', last_checked: '2026-01-03T00:00:00Z' }),
    story(2, 'Beta', { author: 'Anne', site: 'a.test', status: 'error', chapter_count: 10,
      last_changed: '2026-01-02T00:00:00Z', last_checked: '2026-01-02T00:00:00Z' }),
  ];
  await mount(t, list);
  for (const [label, column, direction, order] of [
    ['Last change', 'last_changed', -1, ['Beta', 'Alpha']],
    ['Last change', 'last_changed', 1, ['Alpha', 'Beta']],
    ['Last check', 'last_checked', -1, ['Alpha', 'Beta']],
    ['Last check', 'last_checked', 1, ['Beta', 'Alpha']],
    ['Title', 'title', 1, ['Alpha', 'Beta']],
    ['Title', 'title', -1, ['Beta', 'Alpha']],
    ['Author', 'author', 1, ['Beta', 'Alpha']],
    ['Author', 'author', -1, ['Alpha', 'Beta']],
    ['Site', 'site', 1, ['Beta', 'Alpha']],
    ['Site', 'site', -1, ['Alpha', 'Beta']],
    ['Status', 'status', 1, ['Beta', 'Alpha']],
    ['Status', 'status', -1, ['Alpha', 'Beta']],
    ['Chapters', 'chapter_count', -1, ['Beta', 'Alpha']],
    ['Chapters', 'chapter_count', 1, ['Alpha', 'Beta']],
  ]) {
    await click(app, label);
    assert.deepEqual(JSON.parse(window.localStorage.getItem(SORT_KEY)), { column, direction });
    await mount(t, list);
    assert.deepEqual(titles(), order);
    assert.equal(heading(label).attributes['aria-sort'], direction === 1 ? 'ascending' : 'descending');
  }
});

for (const saved of ['not JSON', 'null', '{}', '{"column":"message","direction":-1}',
  '{"column":"last_changed","direction":0}', '{"column":"last_checked","direction":"-1"}']) {
  test(`invalid saved sorting falls back to title order: ${saved}`, async (t) => {
    window.localStorage.setItem(SORT_KEY, saved);
    await mount(t, [story(2, 'Beta'), story(1, 'Alpha')]);
    assert.deepEqual(titles(), ['Alpha', 'Beta']);
    assert.equal(heading('Title').attributes['aria-sort'], 'ascending');
    await click(app, 'Title');
    assert.deepEqual(JSON.parse(window.localStorage.getItem(SORT_KEY)), { column: 'title', direction: -1 });
  });
}

test('sorting works when local storage cannot be read or written', async (t) => {
  window.localStorage.getItem = () => { throw new Error('Storage blocked'); };
  window.localStorage.setItem = () => { throw new Error('Storage full'); };
  await mount(t, [story(2, 'Beta'), story(1, 'Alpha')]);
  assert.deepEqual(titles(), ['Alpha', 'Beta']);
  await click(app, 'Title');
  assert.deepEqual(titles(), ['Beta', 'Alpha']);
  assert.equal(heading('Title').attributes['aria-sort'], 'descending');
  assert.equal(toasts.textContent, '');
});

test('date sorting compares instants, handles invalid dates and breaks ties by title and id', async (t) => {
  await mount(t, [
    story(7, 'Missing', { last_changed: 'not a date' }),
    story(6, 'Unknown'),
    story(5, 'Epoch', { last_changed: '1970-01-01T00:00:00Z' }),
    story(4, 'Before epoch', { last_changed: '1969-01-01T00:00:00Z' }),
    story(3, 'Zulu', { last_changed: '2026-01-02T00:00:00+02:00' }),
    story(2, 'alpha', { last_changed: '2026-01-01T23:00:00Z' }),
    story(1, 'Alpha', { last_changed: '2026-01-01T23:00:00Z' }),
    story(8, '', { last_changed: '2026-01-01T23:00:00Z' }),
  ]);
  await click(app, 'Last change');
  assert.deepEqual(titles(), ['Alpha', 'alpha', 'https://example.com/8', 'Zulu', 'Epoch', 'Before epoch', 'Missing', 'Unknown']);
  assert.equal(cell(rows()[6], 'Last change').textContent, 'not a date');
  assert.equal(cell(rows()[7], 'Last change').textContent, '');
  await click(app, 'Last change');
  assert.deepEqual(titles(), ['Before epoch', 'Epoch', 'Zulu', 'Alpha', 'alpha', 'https://example.com/8', 'Missing', 'Unknown']);
});

test('headings sort the filtered list after the initial story request finishes', async (t) => {
  let resolve;
  await mount(t, () => new Promise((done) => { resolve = done; }));
  assert.equal(find(app, 'button', 'Last check'), undefined);
  input(field(app, 'Filter stories'), 'Reader');
  resolve([
    story(1, 'Alpha', { last_checked: '2026-01-01T00:00:00Z' }),
    story(2, 'Beta', { last_checked: '2026-01-02T00:00:00Z' }),
  ]);
  await settle();
  await click(app, 'Last check');
  assert.deepEqual(titles(), ['Beta', 'Alpha']);
});

test('filtering and job refreshes keep the selected sort without dropping hidden stories', async (t) => {
  let list = [
    story(1, 'Alpha', { last_changed: '2026-01-01T00:00:00Z' }),
    story(2, 'Beta', { last_changed: '2026-01-02T00:00:00Z' }),
    story(3, 'Gamma', { last_changed: '2026-01-03T00:00:00Z', author: 'Someone else' }),
  ];
  const backend = await mount(t, () => list);
  await click(app, 'Last change');
  input(field(app, 'Filter stories'), 'Reader');
  assert.deepEqual(titles(), ['Beta', 'Alpha']);
  backend.on('GET', 'jobs', [{ id: 'job', story_id: 1, status: 'running' }]);
  startPolling();
  await settle();
  list = [{ ...list[0], last_changed: '2026-01-04T00:00:00Z' }, ...list.slice(1)];
  backend.on('GET', 'jobs', [{ id: 'job', story_id: 1, status: 'done' }]);
  await refreshJobs();
  await settle();
  assert.equal(backend.sent('GET', 'stories').length, 2);
  assert.equal(heading('Last change').attributes['aria-sort'], 'descending');
  assert.equal(document.activeElement, find(app, 'button', 'Last change'));
  assert.deepEqual(titles(), ['Alpha', 'Beta']);
  input(field(app, 'Filter stories'), 'missing');
  assert.match(app.textContent, /No stories match/);
  input(field(app, 'Filter stories'), '');
  assert.deepEqual(titles(), ['Alpha', 'Gamma', 'Beta']);
  await click(app, 'Last check');
  assert.deepEqual(titles(), ['Alpha', 'Beta', 'Gamma']);
  await click(app, 'Last change');
  assert.deepEqual(titles(), ['Alpha', 'Gamma', 'Beta']);
});

test('date columns keep each timestamp on one line, with last change before last check', async (t) => {
  const changed = '2026-01-02T03:04:00Z';
  const checked = '2026-01-03T05:06:00Z';
  await mount(t, [story(1, 'Alpha', { last_changed: changed, last_checked: checked })]);
  const headings = nodes(app).filter((el) => el.tagName === 'th').map((el) => el.textContent);
  assert.deepEqual(headings, ['Title', 'Author', 'Site', 'Chapters', 'Status', 'Last change', 'Last check']);
  for (const [label, value] of [['Last change', changed], ['Last check', checked]]) {
    const dateCell = cell(rows()[0], label);
    const time = nodes(dateCell).find((el) => el.tagName === 'time');
    assert.equal(time.attributes.datetime, value);
    assert.equal(time.attributes.title, fmtDate(value));
    assert.equal(nodes(time).filter((el) => el.tagName === 'br').length, 0);
    assert.equal(time.textContent, fmtDate(value));
  }
});

test('status messages move into accessible pill descriptions without hiding held or chapter counts', async (t) => {
  await mount(t, [
    story(1, 'Alpha', { offsite_count: 3, revised_count: 2, message: 'Updated 2 chapters', upload_held: true, approval_held: true }),
    story(2, 'Beta', { status: 'error', message: '<script>Connection failed</script>' }),
    story(3, 'Gamma'),
    story(4, 'New', { status: '', message: '' }),
    story(5, 'Queued', { status: 'queued', message: '' }),
  ]);
  for (const [row, label, message] of [
    [rows()[0], 'ok', 'Updated 2 chapters'],
    [rows()[1], 'error', '<script>Connection failed</script>'],
    [rows()[2], 'ok', 'No changes'],
  ]) {
    const status = cell(row, 'Status');
    const pill = status.children[0];
    assert.equal(pill.textContent, label);
    assert.equal(pill.attributes.title, message);
    assert.equal(pill.attributes['aria-description'], message);
    assert.equal(pill.attributes.tabindex, '0');
    assert.ok(!status.textContent.includes(message));
    assert.equal(nodes(status).filter((el) => el.tagName === 'small' || el.tagName === 'script').length, 0);
  }
  assert.match(cell(rows()[0], 'Status').textContent, /held/);
  const chapters = cell(rows()[0], 'Chapters');
  assert.match(chapters.textContent, /^42/);
  assert.equal(nodes(chapters).filter((el) => el.className.startsWith('badge')).length, 0);
  const counts = nodes(chapters).filter((el) => el.tagName === 'small');
  assert.deepEqual(counts.map((el) => el.textContent), ['3 removed', '2 revised']);
  assert.deepEqual(counts.map((el) => el.attributes.title), [
    'Chapters the site no longer lists', 'Chapters the site changed since Bindery added them',
  ]);
  assert.equal(cell(rows()[1], 'Chapters').textContent, '42');
  assert.equal(cell(rows()[3], 'Status').textContent, '');
  assert.equal(cell(rows()[4], 'Status').textContent, 'queued');
});