import { test, expect } from '../support/fixtures.js';

/**
 * H-7 and H-11, which are one finding seen from two distances: the app
 * did not fit in its own window.
 *
 * `computeDefaultWidths` shared out the track list's whole
 * `clientWidth` and never subtracted the 24 px favourite column or the
 * 2×8 px row padding that `colBoundaryPositions` already knew about, so
 * every row was 40 px wider than the box holding it (`scrollWidth 1280`
 * against `clientWidth 1240`) and Duration was clipped at every size.
 *
 * And the enforced minimum window was 512×384, which the layout had
 * never supported: at 700×480 the eleven sidebar items needed 406 px of
 * a 352 px pane, `overflow: hidden` cut the last two off, nothing
 * scrolled, and **Settings and Jobs could not be reached at all**.
 *
 * The three viewports are the two common ones and the new enforced
 * minimum (`backend/config/window.go`). The minimum is the one that
 * matters: it is the only size the app is *promising* to work at.
 */

/** Keep in step with `MinWidth`/`MinHeight` in backend/config/window.go. */
const MIN_VIEWPORT = { width: 800, height: 600 };

const VIEWPORTS = [
  { name: '1440×900', width: 1440, height: 900 },
  { name: '1024×768', width: 1024, height: 768 },
  { name: `the minimum (${MIN_VIEWPORT.width}×${MIN_VIEWPORT.height})`, ...MIN_VIEWPORT },
];

/**
 * Rows report their own overflow, which is the symptom a user sees: a
 * column rendered past the edge of the row it belongs to.
 */
const rowOverflow = (page: import('@playwright/test').Page) =>
  page.evaluate(() => {
    const list = document.querySelector('track-list');
    const root = list?.shadowRoot;

    if (!root) return { rows: 0, overflowing: [] as string[] };

    const boxes = [
      ...root.querySelectorAll<HTMLElement>('.header-row, .track-row'),
    ];

    return {
      rows: boxes.length,
      overflowing: boxes
        .filter((b) => b.scrollWidth > b.clientWidth)
        .map((b) => `${b.className}: ${b.scrollWidth} > ${b.clientWidth}`),
    };
  });

test.describe('the app fits in its own window', () => {
  for (const vp of VIEWPORTS) {
    test(`no track row overflows at ${vp.name}`, async ({ app }) => {
      await app.setViewportSize({ width: vp.width, height: vp.height });
      await app.getByTestId('nav-tracks').click();
      await expect(app.getByTestId('main-content')).toHaveAttribute(
        'data-active-view',
        'tracks',
      );

      // The columns are recomputed by a ResizeObserver, so poll rather
      // than read once: a single read races the resize and passes on
      // the widths from the previous viewport.
      await expect.poll(async () => (await rowOverflow(app)).rows).toBeGreaterThan(1);
      await expect
        .poll(async () => (await rowOverflow(app)).overflowing)
        .toEqual([]);
    });
  }

  test('every destination stays reachable at the minimum size', async ({
    app,
  }) => {
    await app.setViewportSize(MIN_VIEWPORT);

    // Below the breakpoint the sidebar collapses to icons; the labels
    // go, the destinations do not.
    const sidebar = app.locator('app-sidebar');

    await expect
      .poll(() =>
        sidebar.evaluate((el) => el.classList.contains('collapsed')),
      )
      .toBe(true);

    // Settings and Jobs are the two that were unreachable: they are
    // last in the nav, and the pane used to clip rather than scroll.
    for (const view of ['jobs', 'settings'] as const) {
      const item = app.getByTestId(`nav-${view}`);

      await item.scrollIntoViewIfNeeded();
      await item.click();
      await expect(app.getByTestId('main-content')).toHaveAttribute(
        'data-active-view',
        view,
      );
    }

    // Leave the app where the next spec expects to find it.
    await app.getByTestId('nav-tracks').click();
    await expect(app.getByTestId('main-content')).toHaveAttribute(
      'data-active-view',
      'tracks',
    );
  });

  test('the sidebar scrolls rather than hiding what does not fit', async ({
    app,
  }) => {
    await app.setViewportSize({ width: 700, height: 480 });

    // Smaller than the enforced minimum on purpose: the window cannot
    // be dragged here, but a scaled display or a large system font can
    // still land the layout in it, and clipping the nav with no scroll
    // is the failure that made Settings unreachable.
    const reachable = await app.locator('app-sidebar').evaluate((el) => {
      const settings = el.shadowRoot?.querySelector<HTMLElement>(
        '[data-testid="nav-settings"]',
      );

      if (!settings) return null;

      el.scrollTop = el.scrollHeight;

      const item = settings.getBoundingClientRect();
      const pane = el.getBoundingClientRect();

      return item.bottom <= Math.ceil(pane.bottom) && item.top >= Math.floor(pane.top);
    });

    expect(reachable).toBe(true);
  });
});