/**
 * #280: launching the app must not load the track list.
 *
 * Every collection used to be fetched at `DOMContentLoaded` and
 * refetched on every invalidation, whichever view was showing. On a
 * 26 138-track library the track list was 20.5 MB of that, and encoding
 * it cost the backend ~170 MB of transient allocation — for someone
 * looking at Home, which draws none of it. Measured on 50 000 tracks:
 * 543 MB of backend RSS at rest before, 296 MB after.
 *
 * The negative assertion is the point, and it needs its complement: "no
 * `GetTrackTable`" also holds on a build that fetches nothing at all,
 * so the same spec opens Tracks and watches it arrive.
 */
import { test, expect, bindingCalls, navigateTo } from '../support/fixtures.js';

const TRACKS = 'library.Library.GetTrackTable';

/** The seed's default page, which is what a launch lands on. */
const LANDING_VIEW = 'home';

test('launching on Home does not load the track list', async ({ app }) => {
  // Past the store's idle warm-up: "nothing was fetched" has to mean
  // nothing, not "nothing has happened yet".
  await app.waitForTimeout(3_500);

  const calls = await bindingCalls(app);

  expect(calls, 'the warm-up for the small collections ran').toContain(
    'library.Library.GetAlbums',
  );
  expect(calls, `the track list was fetched at launch (${LANDING_VIEW})`).not.toContain(
    TRACKS,
  );
});

test('opening Tracks loads it, and only then', async ({ app }) => {
  await app.waitForTimeout(1_000);
  expect(await bindingCalls(app)).not.toContain(TRACKS);

  await navigateTo(app, 'tracks');
  await expect(app.getByTestId('track-row').first()).toBeVisible();

  expect(await bindingCalls(app)).toContain(TRACKS);
});

test('a hover on the nav item starts the load before the click', async ({ app }) => {
  await app.waitForTimeout(1_000);

  const nav = app.getByTestId('nav-tracks');

  // The pointer entering the item is the whole mechanism; nothing is
  // clicked, so the data must arrive because of the hover alone.
  await nav.hover();
  await expect
    .poll(async () => (await bindingCalls(app)).includes(TRACKS))
    .toBe(true);
});