import { describe, expect, it, vi } from "vitest";
import { renderToStaticMarkup } from "react-dom/server";

/**
 * `<AdminShell>` mirrors `<SettingsShell>`: a sticky desktop sidebar
 * plus a horizontal section strip on mobile. With 13 sections the strip
 * is always wider than a 393 CSS-px (Pixel-5) viewport, so v1.4.18
 * phase A2 added the `no-scrollbar` class to the strip — Chromium /
 * WebKit otherwise paint an always-on horizontal scrollbar at the top
 * of every admin page, which the maintainer kept mis-attributing to the
 * `/admin/api-tokens` table card right below it. Three previous fix
 * attempts (v1.4.15 column-hide, v1.4.16 mobile-card-list, then this
 * one) all targeted the table while the bar lived in the shell.
 *
 * This suite locks in the shell-level fix so a future refactor can't
 * silently regress it.
 */

const mockPathnameRef = { value: "/admin/system-status" };
vi.mock("next/navigation", () => ({
  usePathname: () => mockPathnameRef.value,
}));

import { I18nProvider } from "@/lib/i18n/context";
import { ADMIN_SECTIONS, AdminShell } from "../admin-shell";

function renderShell(props: {
  active?: (typeof ADMIN_SECTIONS)[number]["slug"];
  pathname?: string;
}) {
  mockPathnameRef.value = props.pathname ?? "/admin/system-status";
  return renderToStaticMarkup(
    <I18nProvider initialLocale="en">
      <AdminShell active={props.active}>
        <div>section body</div>
      </AdminShell>
    </I18nProvider>,
  );
}

describe("<AdminShell>", () => {
  it("renders every section link in both the mobile strip and the desktop sidebar", () => {
    const html = renderShell({ active: "system-status" });
    for (const section of ADMIN_SECTIONS) {
      const matches = html.match(
        new RegExp(`href="/admin/${section.slug}"`, "g"),
      );
      // Two renders — mobile strip + desktop sidebar.
      expect(matches?.length ?? 0).toBe(2);
    }
  });

  it("mobile section strip uses `no-scrollbar` so the swipe area doesn't paint a horizontal scrollbar", () => {
    // The 13-section strip is ~1700 CSS px wide. Without
    // `no-scrollbar` (defined in `globals.css`) Chromium/WebKit paint
    // an always-on horizontal scrollbar at the top of every admin
    // page. Production probe at https://healthlog.bombeck.io/admin/
    // api-tokens at Pixel-5 viewport pins this as the *only* element
    // with `overflow-x:auto AND scrollWidth > clientWidth`, so the
    // class is the load-bearing fix.
    const html = renderShell({ active: "api-tokens" });
    const nav = html.match(/<nav\b[^>]*md:hidden[^>]*>/);
    expect(nav).not.toBeNull();
    expect(nav![0]).toMatch(/\bno-scrollbar\b/);
    // Scroll behaviour itself is preserved — the strip still uses
    // `overflow-x-auto` so swipe / keyboard-arrow scrolling continues
    // to work, only the painted bar is suppressed.
    expect(nav![0]).toMatch(/\boverflow-x-auto\b/);
  });

  it('marks the active section with aria-current="page" in both layouts', () => {
    const html = renderShell({ active: "api-tokens" });
    const occurrences = html.match(/aria-current="page"/g);
    // Two layouts (mobile strip + desktop sidebar) → two matches.
    expect(occurrences?.length ?? 0).toBe(2);
    // Active link is on the api-tokens href in both renders.
    const activeLinkRegex =
      /<a\b[^>]*\baria-current="page"[^>]*\bhref="\/admin\/api-tokens"|<a\b[^>]*\bhref="\/admin\/api-tokens"[^>]*\baria-current="page"/g;
    expect(html.match(activeLinkRegex)?.length ?? 0).toBe(2);
  });

  it("derives the active slug from the current pathname when `active` is omitted", () => {
    const html = renderShell({ pathname: "/admin/api-tokens" });
    const activeLinkRegex =
      /<a\b[^>]*\baria-current="page"[^>]*\bhref="\/admin\/api-tokens"|<a\b[^>]*\bhref="\/admin\/api-tokens"[^>]*\baria-current="page"/g;
    expect(html.match(activeLinkRegex)?.length ?? 0).toBe(2);
  });

  it("does NOT mark any section active on `/admin` overview", () => {
    const html = renderShell({ pathname: "/admin" });
    // Overview-link only — no section gets aria-current.
    const sectionActive = html.match(
      /aria-current="page"[^>]*\bhref="\/admin\/[^"]+"/g,
    );
    expect(sectionActive?.length ?? 0).toBe(0);
  });
});