import { test, expect, Page } from '@playwright/test';
import AxeBuilder from '@axe-core/playwright';
import {
  createRoom,
  hsReachable,
  loginUI,
  openRoom,
  ensureUser,
  sendText,
  uniq,
  TestUser,
} from './localHs';

// [Gitea #222] Machine-checkable accessibility on every push. Two parts:
//   1. axe-core over the main surfaces, failing on critical/serious findings.
//      Colour-contrast is reported but not gated: several hits are generated
//      avatar colours and portal false positives (see the issue for the list).
//   2. Accessibility-tree snapshots of the composer, message menu, thread
//      panel and settings nav, so a lost name/role/live-region shows up as a
//      diff. Update deliberately with `npx playwright test e2e/a11y --update-snapshots`.
// A real screen-reader pass still needs a human.

const TAGS = ['wcag2a', 'wcag2aa', 'wcag21a', 'wcag21aa'];

async function auditPage(page: Page, label: string) {
  const results = await new AxeBuilder({ page }).withTags(TAGS).analyze();
  const describe = (v: (typeof results.violations)[number]) =>
    `[${v.impact}] ${v.id}: ${v.help}\n${v.nodes
      .slice(0, 5)
      .map((n) => `    ${n.html.replace(/\s+/g, ' ').slice(0, 140)}`)
      .join('\n')}`;
  const contrast = results.violations.filter((v) => v.id === 'color-contrast');
  if (contrast.length) {
    // eslint-disable-next-line no-console
    console.log(`axe ${label}: contrast (not gated)\n${contrast.map(describe).join('\n')}`);
  }
  const gated = results.violations.filter(
    (v) => v.id !== 'color-contrast' && (v.impact === 'critical' || v.impact === 'serious'),
  );
  expect(gated.map(describe), `axe ${label}: critical/serious findings`).toEqual([]);
}

test.describe('accessibility', () => {
  test('login page passes axe @webkit', async ({ page }) => {
    await page.goto('/');
    await expect(page.getByLabel('Username or email')).toBeVisible();
    await auditPage(page, 'login');
  });

  test.describe('signed in', () => {
    let alice: TestUser;
    let room: string;

    test.beforeAll(async () => {
      test.skip(!(await hsReachable()), 'no local homeserver');
      alice = await ensureUser(uniq('e2e_a11y_'));
      room = await createRoom(alice, 'A11y Room');
      const root = await sendText(alice, room, 'thread root for a11y');
      await sendText(alice, room, 'a reply', {
        'm.relates_to': {
          rel_type: 'm.thread',
          event_id: root,
          is_falling_back: true,
          'm.in_reply_to': { event_id: root },
        },
      });
    });

    test.beforeEach(async ({ page }) => {
      await page.setViewportSize({ width: 1400, height: 850 });
      await loginUI(page, alice);
      await openRoom(page, room);
      await expect(page.getByText('thread root for a11y')).toBeVisible();
    });

    test('room timeline + composer', async ({ page }) => {
      await auditPage(page, 'room');
      await expect(page.locator('[data-slate-editor]').first()).toMatchAriaSnapshot({
        name: 'composer-editor.aria.yml',
      });
      await expect(page.getByRole('button', { name: 'Send message' })).toMatchAriaSnapshot({
        name: 'composer-send.aria.yml',
      });
    });

    test('message options menu', async ({ page }) => {
      const msg = page.locator('[data-message-item]', { hasText: 'thread root for a11y' });
      await msg.hover();
      await msg.getByRole('button', { name: 'More options' }).click();
      const menu = page.locator('[data-message-menu]').first();
      await expect(menu).toBeVisible();
      await auditPage(page, 'message menu');
      await expect(menu).toMatchAriaSnapshot({ name: 'message-menu.aria.yml' });
    });

    test('thread panel', async ({ page }) => {
      await page
        .locator('[data-message-item]', { hasText: 'thread root for a11y' })
        .getByText(/1 reply/)
        .click();
      await expect(page.locator('[data-slate-editor]')).toHaveCount(2);
      await auditPage(page, 'thread panel');
      await expect(page.getByRole('complementary').first()).toMatchAriaSnapshot({
        name: 'thread-panel.aria.yml',
      });
    });

    test('user settings', async ({ page }) => {
      await page.getByRole('button', { name: 'User Settings' }).click();
      const dialog = page.getByRole('dialog').first();
      await expect(dialog).toBeVisible();
      await auditPage(page, 'settings');
      await expect(dialog.getByRole('navigation').first()).toMatchAriaSnapshot({
        name: 'settings-nav.aria.yml',
      });
    });

    test('room settings', async ({ page }) => {
      await page.getByRole('button', { name: 'More Options' }).first().click();
      await page.getByText('Room Settings', { exact: true }).click();
      await expect(page.getByRole('dialog').first()).toBeVisible();
      await auditPage(page, 'room settings');
    });
  });
});