import { expect, test, type Locator } from '@playwright/test';
import { DOC, shot, signIn } from './helpers';

/** WCAG contrast ratio of two CSS colours `rgb(r, g, b)`. */
function contrast(a: string, b: string): number {
  const lum = (c: string) => {
    const [r, g, bl] = (c.match(/[\d.]+/g) ?? []).slice(0, 3).map((x) => {
      const v = Number(x) / 255;
      return v <= 0.03928 ? v / 12.92 : ((v + 0.055) / 1.055) ** 2.4;
    });
    return 0.2126 * (r ?? 0) + 0.7152 * (g ?? 0) + 0.0722 * (bl ?? 0);
  };
  const [hi, lo] = [lum(a), lum(b)].sort((x, y) => y - x);
  return ((hi ?? 0) + 0.05) / ((lo ?? 0) + 0.05);
}

/** The colour the ring of a swatch is drawn on: the first opaque background around it. */
async function backdrop(el: Locator): Promise<string> {
  return el.evaluate((node) => {
    for (let n: Element | null = node.parentElement; n; n = n.parentElement) {
      const bg = getComputedStyle(n).backgroundColor;
      if (bg && bg !== 'transparent' && !/rgba\(.*,\s*0\)$/.test(bg)) return bg;
    }
    return getComputedStyle(document.body).backgroundColor;
  });
}

test('M1 — mobile : logo dans la barre, menu en tiroir, vote déplié, panier, réglages lisibles, pastilles au clavier', async ({ page }) => {
  await signIn(page, 'Chiara');
  await page.goto('/');
  const brand = page.locator('header.topbar a.brand');
  await expect(brand).toHaveAccessibleName('libreDecision');
  await expect(brand.locator('svg')).toBeVisible();
  await expect(page.locator('a.root')).toContainText('Monnaie libre');
  await page.goto(DOC);
  await page.getByRole('button', { name: 'Menu' }).click();
  const drawer = page.getByRole('dialog', { name: 'Boîte à outils' });
  await expect(drawer.locator('.tool', { hasText: 'Protocoles' })).toBeVisible();
  await expect(drawer.locator('.tool', { hasText: 'Docs de référence' }).locator('.count')).toHaveText('1');
  const moods = drawer.getByRole('radiogroup', { name: 'Ambiance' });
  await expect(moods.getByRole('radio')).toHaveCount(4);

  // The swatches, by keyboard: one stop for Tab, the arrows move and choose; the focus ring
  // reads at 3:1 or more on the page whatever the swatch, and is not the mark of the chosen one.
  await expect(moods.locator('[tabindex="0"]')).toHaveCount(1);
  const start = (await page.locator('html').getAttribute('data-mood')) ?? '';
  await moods.getByRole('radio', { checked: true }).focus();
  for (let i = 0; i < 4; i++) {
    await page.keyboard.press('ArrowRight');
    const now = moods.getByRole('radio', { checked: true });
    await expect(now).toBeFocused();
    await expect(moods.locator('[tabindex="0"]')).toHaveCount(1);
    const ring = await now.evaluate((el) => {
      const cs = getComputedStyle(el);
      return { style: cs.outlineStyle, color: cs.outlineColor, width: parseFloat(cs.outlineWidth) };
    });
    expect(ring.style).toBe('dashed');
    expect(ring.width).toBeGreaterThanOrEqual(2);
    const mood = await page.locator('html').getAttribute('data-mood');
    expect(contrast(ring.color, await backdrop(moods)), `${mood}: ${ring.color}`).toBeGreaterThanOrEqual(3);
    if (i === 0) await shot(page, '7-pastilles-focus-mobile');
  }
  await expect(page.locator('html')).toHaveAttribute('data-mood', start);
  await page.keyboard.press('ArrowLeft');
  await expect(page.locator('html')).not.toHaveAttribute('data-mood', start);
  await page.keyboard.press('ArrowRight');
  await expect(page.locator('html')).toHaveAttribute('data-mood', start);
  // The chosen one, without the focus: its own mark, a ring of ink, never the dashed one.
  const chosen = moods.getByRole('radio', { checked: true });
  await chosen.evaluate((el) => (el as HTMLElement).blur());
  const mark = await chosen.evaluate((el) => ({ outline: getComputedStyle(el).outlineStyle, shadow: getComputedStyle(el).boxShadow }));
  expect(mark.outline).toBe('none');
  expect(mark.shadow).toContain('0px 0px 0px 2px');
  await drawer.getByRole('button', { name: 'Fermer' }).first().click();

  // The vote unfolds under the article, on a phone too.
  const first = page.locator('section.text article.unit').first();
  await first.getByRole('button', { name: 'Le vote' }).click();
  const fold = first.locator('section.fold');
  await expect(fold.getByText('Seuil : 50 voix pour')).toBeVisible();
  // The settings of the formula read on a phone: the table of the five levels holds in the sheet.
  await fold.getByRole('button', { name: 'Réglages de la formule' }).click();
  const panel = page.locator('aside.panel');
  await expect(panel.getByRole('tab', { name: 'Réglages' })).toBeInViewport();
  await expect(panel.locator('table tbody tr')).toHaveCount(5);
  const fits = await panel.locator('.scroll').evaluate((el) => el.scrollWidth <= el.clientWidth + 1);
  expect(fits).toBe(true);
  await panel.getByRole('button', { name: 'Fermer le panneau' }).click();

  // The basket holds on a phone: its send button stays in sight, nothing overflows.
  await page.getByRole('button', { name: /^Voter en lot/ }).click();
  await expect(panel.getByRole('heading', { name: 'Panier de vote' })).toBeVisible();
  await panel.getByRole('group', { name: 'Ton choix pour « Unicité du compte »' }).getByRole('button', { name: 'Pour' }).click();
  await panel.getByRole('group', { name: 'Ton choix pour « Réciprocité »' }).getByRole('button', { name: 'Contre' }).click();
  const send = panel.getByRole('button', { name: 'Signer et envoyer (2)' });
  await expect(send).toBeInViewport();
  const holds = await panel.locator('.body').evaluate((el) => el.scrollWidth <= el.clientWidth + 1);
  expect(holds).toBe(true);
  await shot(page, '3-panier-mobile');
  // Taken back out of the basket: nothing was sent.
  await panel.getByRole('group', { name: 'Tout le document' }).getByRole('button', { name: 'Vider' }).click();
  await expect(panel.getByText("Rien dans le panier pour l'instant.")).toBeVisible();
});