scrabble-game/ui/e2e/offline.spec.ts

import { test, expect, type Page } from './fixtures';

// The offline mode is gated to an installed standalone PWA with a confirmed email. The mock account
// has an email; force the standalone display mode so the Settings offline toggle is offered. Only the
// `(display-mode: standalone)` query is overridden — theme/reduce-motion queries pass through.
async function forceStandalone(page: Page): Promise<void> {
  await page.addInitScript(() => {
    const orig = window.matchMedia.bind(window);
    window.matchMedia = (q: string) =>
      (q.includes('display-mode: standalone')
        ? { matches: true, media: q, onchange: null, addEventListener() {}, removeEventListener() {}, addListener() {}, removeListener() {}, dispatchEvent: () => false }
        : orig(q)) as MediaQueryList;
  });
}

// After a load or reload, land in the lobby (dismiss the login screen if it is shown).
async function enterLobby(page: Page): Promise<void> {
  const guest = page.getByRole('button', { name: /guest|гост/i });
  if (await guest.count()) await guest.first().click();
  // The lobby tab bar has three tabs in a fixed order: New (0), Stats (1), Settings (2). nth() is
  // robust to locale, emoji variation selectors and the coachmark anchors (which the first-run
  // onboarding strips after it completes).
  await expect(page.locator('button.tab').nth(2)).toBeVisible();
}

// Pick a rack tile by its glyph and drop it on a board square (the rack of the pinned-seed game has
// all-distinct letters, so the glyph is unambiguous).
async function placeTile(page: Page, glyph: string, row: number, col: number): Promise<void> {
  await page.locator('.rack .tile', { hasText: glyph }).first().click();
  await page.locator(`[data-cell][data-row="${row}"][data-col="${col}"]`).click();
}

test.describe('offline mode', () => {
  test('enter via the toggle, play a local vs_ai game, persist across a reload', async ({ page }) => {
    await forceStandalone(page);
    await page.goto('/');
    await enterLobby(page);

    // Online: a seeded online game (vs Ann) is listed.
    await expect(page.getByText('Ann', { exact: false }).first()).toBeVisible();

    // Enter offline through the real Settings toggle (its readiness check fetches every enabled
    // variant's dawg, served from /e2edict/ by the mock) — the header turns blue with the chip.
    await page.locator('button.tab').nth(2).click();
    await page.getByRole('button', { name: /^(Offline|Оффлайн)$/ }).click();
    await expect(page.locator('header.nav.offline')).toBeVisible({ timeout: 15000 });

    // Back in the (now offline) lobby: the online games are hidden and the Stats tab is disabled.
    await page.getByRole('button', { name: /Back|Назад/i }).click();
    await expect(page.locator('button.tab').nth(2)).toBeVisible();
    await expect(page.getByText('Ann', { exact: false })).toHaveCount(0);
    await expect(page.locator('button.tab').nth(1)).toBeDisabled();

    // Create a device-local English vs_ai game with a pinned bag seed (deals the rack NEWYMAO).
    await page.evaluate(() => (window as unknown as { __mock: { setLocalSeed(s: string): void } }).__mock.setLocalSeed('1'));
    await page.locator('button.tab').nth(0).click();
    // The English variant's display name is "Scrabble" (Latin) in both locales — the Russian
    // variants are "Скрэббл"/"Эрудит"/"Erudite", so this uniquely selects the English game.
    await page.locator('.variant', { hasText: 'Scrabble' }).click();
    await page.locator('button.invite').click();
    await expect(page.locator('[data-cell]').first()).toBeVisible();

    // The human plays WAY horizontally across the centre (7,5)-(7,7).
    await placeTile(page, 'W', 7, 5);
    await placeTile(page, 'A', 7, 6);
    await placeTile(page, 'Y', 7, 7);
    await expect(page.locator('[data-cell].pending')).toHaveCount(3);
    await page.locator('.make').click();

    // The play commits and the local robot replies with a real move, so the board carries more than
    // WAY's three tiles.
    await expect(async () => {
      expect(await page.locator('[data-cell].filled').count()).toBeGreaterThan(3);
    }).toPass({ timeout: 15000 });
    const filled = await page.locator('[data-cell].filled').count();

    // Reload: the hash router restores the /game/<id> route and the local game replays from
    // IndexedDB with every committed tile intact.
    await page.reload();
    await expect(page.locator('[data-cell]').first()).toBeVisible();
    await expect(page.locator('[data-cell].filled')).toHaveCount(filled);
  });
});