import { render } from '@testing-library/react';
import { describe, it, expect, afterEach } from 'vitest';
import { HiloConductor } from '../HiloConductor';
import { BARRAS_SIMBOLO, VIEWBOX_SIMBOLO } from '@/lib/simbolo';

const preferirMenosMovimiento = () => {
  window.matchMedia = (query: string) =>
    ({
      matches: true,
      media: query,
      onchange: null,
      addEventListener: () => {},
      removeEventListener: () => {},
      addListener: () => {},
      removeListener: () => {},
      dispatchEvent: () => false,
    }) as unknown as MediaQueryList;
};

const simboloFinal = (container: HTMLElement) =>
  Array.from(container.querySelectorAll('svg')).find(
    (svg) => svg.getAttribute('viewBox') === VIEWBOX_SIMBOLO,
  );

describe('<HiloConductor />', () => {
  const matchMediaOriginal = window.matchMedia;
  afterEach(() => {
    window.matchMedia = matchMediaOriginal;
  });

  it('is decorative: hidden from assistive tech', () => {
    const { container } = render(<HiloConductor />);
    const svg = container.querySelector('svg');
    expect(svg).toHaveAttribute('aria-hidden', 'true');
    expect(svg).toHaveAttribute('focusable', 'false');
  });

  it('draws a single continuous thread', () => {
    const { container } = render(<HiloConductor />);
    expect(container.querySelectorAll('path')).toHaveLength(1);
  });

  it('travels with the document instead of sticking to the viewport', () => {
    const { container } = render(<HiloConductor />);
    // `fixed` would read as an ornament pinned to the window; the thread
    // belongs to the page and must scroll with it.
    expect(container.firstElementChild?.className).toContain('absolute');
    expect(container.firstElementChild?.className).not.toContain('fixed');
  });

  it('stays out of the way of pointer input', () => {
    const { container } = render(<HiloConductor />);
    expect(container.firstElementChild?.className).toContain('pointer-events-none');
  });

  it('runs down the centre of the column, not in a side gutter', () => {
    const { container } = render(<HiloConductor />);
    const cls = container.querySelector('svg')?.getAttribute('class') ?? '';
    // `left-1/2 -translate-x-1/2` anchors the thread to the column's centre;
    // the old `right-full` banished it to the left gutter, which is why the
    // thread read as off to the side instead of as the page's spine.
    expect(cls).toContain('left-1/2');
    expect(cls).toContain('-translate-x-1/2');
    expect(cls).not.toContain('right-full');
  });

  it('declares a stacking level that beats section roots but stays under the header', () => {
    const { container } = render(<HiloConductor />);
    const wrapperClass = container.firstElementChild?.className ?? '';
    // Section roots never set z-index (auto), so any explicit positive value
    // paints above them regardless of whether the section itself happens to
    // be `position: relative` or `static` — that inconsistency was the bug.
    // The sticky header is z-50 and must still win.
    expect(wrapperClass).toMatch(/\bz-\d+\b/);
    expect(wrapperClass).not.toContain('z-50');
  });

  it('renders on every breakpoint, not only on very wide screens', () => {
    const { container } = render(<HiloConductor />);
    const wrapperClass = container.firstElementChild?.className ?? '';
    // The thread is the brand's through-line; it belongs in the middle on a
    // phone too. Legibility is handled by layering it behind the text, not by
    // hiding it below a breakpoint.
    expect(wrapperClass).not.toContain('hidden');
    expect(wrapperClass).not.toContain('2xl:block');
  });

  it('keeps its declared weight on screen despite the non-uniform viewBox scale', () => {
    const { container } = render(<HiloConductor />);
    // The band is stretched with preserveAspectRatio="none": y over the whole
    // document, x over a couple hundred pixels. That squeezes the stroke of a
    // near-vertical line by the x factor alone, so a declared 1.5 rendered as
    // well under 1 real pixel — a ghost hairline. non-scaling-stroke pins the
    // width to the value we actually chose.
    expect(container.querySelector('path')).toHaveAttribute('vector-effect', 'non-scaling-stroke');
  });

  it('reads as a band, not as a hairline', () => {
    const { container } = render(<HiloConductor />);
    const grosor = Number(container.querySelector('path')?.getAttribute('stroke-width'));
    // Twice regressed into a thread nobody could see. The band is the page's
    // spine and has to carry weight; the text stays legible because it sits a
    // stacking level above, not because the band is faint.
    expect(grosor).toBeGreaterThanOrEqual(10);
  });

  it('sweeps wide enough across the column to read as a route', () => {
    const { container } = render(<HiloConductor />);
    const d = container.querySelector('path')?.getAttribute('d') ?? '';
    // Coordinates come in x/y pairs, so the even ones are the horizontal
    // excursion, in a 0–100 viewBox stretched across the content column.
    // Too little travel and the swell collapses into a straight rule.
    const numeros = (d.match(/-?\d+(?:\.\d+)?/g) ?? []).map(Number);
    const xs = numeros.filter((_, i) => i % 2 === 0);
    expect(Math.max(...xs) - Math.min(...xs)).toBeGreaterThanOrEqual(30);
    expect((d.match(/C/g) ?? []).length).toBeGreaterThanOrEqual(3);
  });

  it('resolves into the ≡ of the wordmark instead of stopping in mid-air', () => {
    const { container } = render(<HiloConductor />);
    const simbolo = simboloFinal(container);
    // Per the design: the thread "resuelve en el ≡ del wordmark en el cierre".
    // It reuses the brand geometry rather than drawing a lookalike.
    expect(simbolo).toBeDefined();
    expect(simbolo?.querySelectorAll('rect')).toHaveLength(BARRAS_SIMBOLO.length);
  });

  it('shows the resolved ≡ from the start under reduced motion', () => {
    preferirMenosMovimiento();

    const { container } = render(<HiloConductor />);
    const barras = Array.from(simboloFinal(container)?.querySelectorAll('rect') ?? []);
    // These readers never get the scroll draw that reveals the mark, so the
    // ending has to be there already — otherwise the thread ends in nothing.
    expect(barras).toHaveLength(BARRAS_SIMBOLO.length);
    barras.forEach((barra) => {
      expect(barra.getAttribute('style') ?? '').not.toContain('opacity: 0');
    });
  });

  it('renders a genuine plain path under reduced motion, not a neutralised motion.path', () => {
    preferirMenosMovimiento();

    const { container } = render(<HiloConductor />);
    const path = container.querySelector('path');
    // motion.path stamps stroke-dasharray/stroke-dashoffset onto the DOM even
    // without initial/animate — the dash-scaffolding trap that leaves the
    // thread invisible for reduced-motion users. A real plain <path> never
    // gets them, so their absence proves the branches weren't collapsed back
    // into one.
    expect(path).not.toHaveAttribute('stroke-dasharray');
    expect(path).not.toHaveAttribute('stroke-dashoffset');
  });
});