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

/**
 * The touch gestures against the real app (plan 019, #63; long-press
 * from plan 016 B2).
 *
 * The component tier proves the gestures in isolation, against markup
 * it built itself. What it cannot prove is the half that made this one
 * document listener instead of six: that the announced gesture reaches
 * the handler a *real* component bound — `track-list` delegates on the
 * `lit-virtualizer` rather than binding per row — and that the real
 * menu opens from it, a path with its own history of opening and then
 * refusing to work (see `menu-keyboard.spec.ts`).
 *
 * **Both halves of the reassignment are here, and the second is the
 * one that matters.** #63 makes a hold on a *track row* mean selection
 * mode; every other surface in the app keeps the context menu it has
 * had, because an unclaimed `yj-long-press` still becomes a
 * `contextmenu`. A spec that only checked the row would pass on a
 * build that had silently broken the other thirteen menus.
 *
 * The pointer events are dispatched rather than performed: this
 * project runs Desktop Chrome and Desktop Safari, neither of which has
 * touch. So this is honest about what it checks — the app's own
 * listeners, on the app's own DOM, from the events a touch would
 * produce — and not about a real finger. The finger is the Android
 * tier, and it found something this cannot see: Chrome 113's WebView
 * fires its own `contextmenu` on a long press, which is why the module
 * announces the gesture from a native event rather than standing down.
 */

/** A common small phone, as in `phone-shell.spec.ts`. */
const PHONE = { width: 390, height: 844 };

/** Comfortably past the module's 500ms hold. */
const HELD = 900;

type Page = import('@playwright/test').Page;

/** A component's menu panel, or null while it is not rendered. */
const panel = (page: Page, host: string) =>
  page.evaluate((tag) => {
    const el = document
      .querySelector(tag)
      ?.shadowRoot?.querySelector('.context-menu-panel');

    if (!el) return null;

    return {
      role: el.getAttribute('role'),
      label: el.getAttribute('aria-label'),
      items: el.querySelectorAll('[role="menuitem"]').length,
    };
  }, host);

/** How many tracks the selection bar says are selected, or null. */
const selectionCount = (page: Page) =>
  page.evaluate(() => {
    const bar = document
      .querySelector('track-list')
      ?.shadowRoot?.querySelector('selection-bar');

    return bar ? (bar as unknown as { count: number }).count : null;
  });

/**
 * Press an element, optionally dragging partway through — the shape of
 * a scroll that begins on a row, which must be neither gesture — and
 * optionally lifting, which is what makes it a tap rather than a hold.
 */
async function press(
  page: Page,
  selector: { host: string; inner: string },
  opts: { driftY?: number; lift?: boolean } = {},
): Promise<void> {
  await page.evaluate(
    ({ host, inner, drift, lift }) => {
      const el = document
        .querySelector(host)
        ?.shadowRoot?.querySelector(inner);

      if (!el) throw new Error(`no ${inner} in ${host} to press`);

      const box = el.getBoundingClientRect();
      const x = Math.round(box.left + box.width / 2);
      const y = Math.round(box.top + box.height / 2);
      const send = (type: string, dy = 0) =>
        el.dispatchEvent(
          new PointerEvent(type, {
            bubbles: true,
            composed: true,
            cancelable: true,
            pointerType: 'touch',
            isPrimary: true,
            clientX: x,
            clientY: y + dy,
          }),
        );

      send('pointerdown');

      if (drift) send('pointermove', drift);
      if (lift) send('pointerup');
    },
    {
      host: selector.host,
      inner: selector.inner,
      drift: opts.driftY ?? 0,
      lift: opts.lift ?? false,
    },
  );
}

// `.track-row`, not `[role="row"]`: the column header is a row too, and
// it is the *first* one — a press on it is correctly ignored, which
// reads exactly like the gesture not working.
const TRACK_ROW = { host: 'track-list', inner: '.track-row' };

test.describe('a hold on a track row selects it', () => {
  test.beforeEach(async ({ app }) => {
    await app.setViewportSize(PHONE);
    await app.getByTestId('tab-tracks').click();
    await expect(app.getByTestId('main-content')).toHaveAttribute(
      'data-active-view',
      'tracks',
    );
  });

  test.afterEach(async ({ app }) => {
    // Every other spec file runs against a desktop, and the viewport
    // belongs to the shared context rather than to this file.
    await app.setViewportSize({ width: 1440, height: 900 });
  });

  test('raises the selection bar rather than the context menu', async ({
    app,
  }) => {
    await expect.poll(() => selectionCount(app)).toBeNull();

    await press(app, TRACK_ROW);

    await expect
      .poll(() => selectionCount(app), { timeout: HELD + 2000 })
      .toBe(1);

    // The gesture is claimed, so the menu this hold used to open must
    // not also be up -- on a phone that would be a sheet over the bar.
    expect(await panel(app, 'track-list')).toBeNull();
  });

  test('is neither gesture when the press turns into a scroll', async ({
    app,
  }) => {
    await press(app, TRACK_ROW, { driftY: 40 });
    await app.waitForTimeout(HELD);

    expect(await selectionCount(app)).toBeNull();
    expect(await panel(app, 'track-list')).toBeNull();
  });
});

test.describe('a hold anywhere else still opens the menu', () => {
  test.beforeEach(async ({ app }) => {
    await app.setViewportSize(PHONE);
    await app.getByTestId('tab-albums').click();
    await expect(app.getByTestId('main-content')).toHaveAttribute(
      'data-active-view',
      'albums',
    );
  });

  test.afterEach(async ({ app }) => {
    await app.setViewportSize({ width: 1440, height: 900 });
  });

  test('reaches the delegated handler and opens the real menu', async ({
    app,
  }) => {
    // The property that let #63 reassign the hold without touching one
    // of the fourteen context menus: unclaimed, it is what it was.
    // Without this half, breaking all of them passes the suite.
    await expect.poll(() => panel(app, 'cover-grid')).toBeNull();

    await press(app, { host: 'cover-grid', inner: '[role="option"]' });

    await expect
      .poll(() => panel(app, 'cover-grid'), { timeout: HELD + 2000 })
      .toMatchObject({ role: 'menu' });

    // The same panel Shift+F10 opens, items and all -- not an empty
    // popup that happened to become visible.
    expect((await panel(app, 'cover-grid'))?.items).toBeGreaterThan(0);
  });
});

/**
 * Swipe right on a track row to queue it (plan 019 phase 2, #63).
 *
 * The component tier has the rule this obeys — one row is a position,
 * several are a choice — against a queue that is a fake. What is only
 * true here is that the gesture reaches the *real* queue: `AddTracks`
 * is a Go method, the queue is persisted, and "the row was added"
 * is a question only the backend can answer.
 *
 * **It is Chromium-only, and that is a property of the browser rather
 * than a gap.** The gesture runs on touch events, because Chrome 113's
 * WebView cancels the pointer stream ~16px into any drag whatever
 * `touch-action` says. Desktop WebKit implements no `TouchEvent`
 * constructor at all — touch events are a mobile-Safari surface — so
 * the events this needs cannot be built there. Skipping loudly is
 * better than a spec that quietly asserts nothing on half the matrix,
 * which is what `layout-overflow.spec.ts` and `back-navigation.spec.ts`
 * were each doing when they were green on a broken build.
 */
test.describe('a swipe right on a track row queues it', () => {
  test.beforeEach(async ({ app, browserName }) => {
    test.skip(
      browserName !== 'chromium',
      'desktop WebKit has no TouchEvent constructor to build the gesture from',
    );

    await app.setViewportSize(PHONE);
    await app.getByTestId('tab-tracks').click();
    await expect(app.getByTestId('main-content')).toHaveAttribute(
      'data-active-view',
      'tracks',
    );
  });

  test.afterEach(async ({ app }) => {
    await app.setViewportSize({ width: 1440, height: 900 });
  });

  /**
   * Drag the first row sideways by a fraction of its own width and
   * lift. `fraction` is against the row, because the commit threshold
   * is — a number of pixels here would be a second declaration of it,
   * right on one viewport and wrong on the next.
   */
  const swipeFirstRow = (page: Page, fraction: number) =>
    page.evaluate((f) => {
      const row = document
        .querySelector('track-list')
        ?.shadowRoot?.querySelector('.track-row');

      if (!row) throw new Error('no track row to swipe');

      const box = row.getBoundingClientRect();
      const y = box.top + box.height / 2;
      const at = (x: number) =>
        new Touch({
          identifier: 1,
          target: row,
          clientX: box.left + x,
          clientY: y,
        });
      const send = (type: string, points: Touch[]) =>
        row.dispatchEvent(
          new TouchEvent(type, {
            bubbles: true,
            composed: true,
            cancelable: true,
            touches: points,
            changedTouches: points.length > 0 ? points : [at(0)],
          }),
        );

      send('touchstart', [at(0)]);

      for (const step of [0.25, 0.5, 0.75, 1]) {
        send('touchmove', [at(box.width * f * step)]);
      }

      send('touchend', []);
    }, fraction);

  /** How many tracks the backend says are in the queue. */
  const queueLength = async (page: Page) => {
    const state = await callBinding<{ tracks: unknown[] }>(
      page,
      'queue.Queue.GetState',
    );

    return state.tracks?.length ?? 0;
  };

  test('adds exactly one track to the real queue', async ({ app }) => {
    const before = await queueLength(app);

    await swipeFirstRow(app, 0.6);

    await expect.poll(() => queueLength(app)).toBe(before + 1);

    // Queued, not played: a swipe is not a tap, and the difference is
    // what is on screen afterwards.
    expect(
      await app.getByTestId('main-content').getAttribute('data-active-view'),
    ).toBe('tracks');
  });

  test('does nothing when the finger did not get far enough', async ({
    app,
  }) => {
    const before = await queueLength(app);

    await swipeFirstRow(app, 0.1);
    await app.waitForTimeout(400);

    expect(await queueLength(app)).toBe(before);
  });
});