// @vitest-environment jsdom
//
// The wizard is a modal overlay in every way that matters to a user, but it renders its own shell
// instead of going through `ui/Modal` — and for a keyboard or screen-reader user it had nothing of
// the dialog contract: no role, no label, no initial focus, no trap, no restore. Tab past its last
// control walked into the app behind the scrim, where the focus ring is invisible (round 5).
//
// `focusablesIn` filters on `el.offsetParent !== null` and jsdom reports null for everything, so the
// trap is untestable as written without the same stub `ui/Modal.dom.test.tsx` uses.
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { render, cleanup, screen, fireEvent, act } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

vi.mock("react-i18next", async (importOriginal) => {
  const actual = await importOriginal<typeof import("react-i18next")>();
  return {
    ...actual,
    useTranslation: () => ({ t: (key: string) => key, i18n: { language: "en" } }),
    Trans: ({ i18nKey }: { i18nKey: string }) => i18nKey,
  };
});
vi.mock("../lib/onboarding", () => ({ beginGrant: vi.fn(), endOnboarding: vi.fn() }));

import OnboardingWizard from "./OnboardingWizard";
import { api, type Me } from "../lib/api";
import { clearAll, notify } from "../lib/notifications";

const me = { id: 1, email: "a@b", can_read: false, can_write: false } as unknown as Me;

let origDesc: PropertyDescriptor | undefined;
beforeEach(() => {
  vi.spyOn(api, "myStatus").mockResolvedValue({ channels_total: 0 } as never);
  origDesc = Object.getOwnPropertyDescriptor(HTMLElement.prototype, "offsetParent");
  Object.defineProperty(HTMLElement.prototype, "offsetParent", {
    configurable: true,
    get(this: HTMLElement) {
      return this.isConnected ? document.body : null;
    },
  });
});
afterEach(() => {
  cleanup();
  if (origDesc) Object.defineProperty(HTMLElement.prototype, "offsetParent", origDesc);
  else delete (HTMLElement.prototype as unknown as Record<string, unknown>).offsetParent;
  vi.restoreAllMocks();
});

const mount = () =>
  render(
    <QueryClientProvider
      client={new QueryClient({ defaultOptions: { queries: { retry: false } } })}
    >
      <OnboardingWizard me={me} onClose={() => {}} />
    </QueryClientProvider>,
  );

describe("the onboarding wizard as a dialog", () => {
  it("announces itself as a labelled modal dialog", () => {
    mount();
    const panel = screen.getByRole("dialog");
    expect(panel.getAttribute("aria-modal")).toBe("true");
    // The label is the step's own heading — the wizard has no header row to take a title from.
    const heading = document.getElementById(panel.getAttribute("aria-labelledby")!);
    expect(heading?.textContent).toBe("onboarding.read.title");
  });

  it("opens focused inside itself and keeps Tab from leaving", () => {
    const outside = document.createElement("button");
    outside.textContent = "behind the scrim";
    document.body.appendChild(outside);
    outside.focus();

    const { unmount } = mount();
    const panel = screen.getByRole("dialog");
    expect(panel.contains(document.activeElement)).toBe(true);

    // From the last control, Tab wraps back to the first instead of reaching the page behind.
    const stops = [...panel.querySelectorAll<HTMLElement>("button, a[href]")];
    stops[stops.length - 1]!.focus();
    fireEvent.keyDown(window, { key: "Tab" });
    expect(document.activeElement).toBe(stops[0]);

    // …and closing hands the focus back to whatever opened it.
    unmount();
    expect(document.activeElement).toBe(outside);
    outside.remove();
  });

  it("holds a Shift+Tab that starts on the panel itself", () => {
    // `Node.contains(self)` is true, so focus sitting ON the tabIndex=-1 panel — where a click on
    // its dead space puts it — matched no branch of `trapTab` and the browser's native Shift+Tab
    // ran, into the app behind the scrim. That is what the third argument exists for, and this
    // caller was written without it on the very commit that extracted the helper (round 6).
    mount();
    const panel = screen.getByRole("dialog");
    panel.focus();
    expect(document.activeElement).toBe(panel);
    const stops = [...panel.querySelectorAll<HTMLElement>("button, a[href]")];
    fireEvent.keyDown(window, { key: "Tab", shiftKey: true });
    expect(document.activeElement).toBe(stops[stops.length - 1]);
  });

  it("still hands the focus back after it visited the wizard's own toast", () => {
    // Ownership has to be measured over the same scope the Tab trap uses. The wizard's toast host
    // sits beside the panel and INSIDE the dialog, so tabbing to a toast's ✕ is legal — but read
    // against the panel alone it said "the user left", and since removing the toast fires no
    // focusin to re-arm, closing afterwards stranded the focus on <body> (round 6). Unlike
    // `ui/Modal`, whose root carries the aria-modal attribute, nothing else can rescue this one.
    const outside = document.createElement("button");
    document.body.appendChild(outside);
    outside.focus();
    const { unmount } = mount();
    act(() => void notify({ level: "error", message: "offline" }));
    const dismissToast = screen.getByTitle("notifications.dismiss");
    dismissToast.focus();
    expect(document.activeElement).toBe(dismissToast);
    act(() => clearAll()); // the toast goes away under the focus — no focusin follows
    unmount();
    expect(document.activeElement).toBe(outside);
    outside.remove();
  });

  it("keeps its own toast's dismiss button inside the Tab cycle", () => {
    // The wizard renders its own `<Toaster overlay>` beside the panel, and the connection notice it
    // can raise never auto-dismisses — so a trap scoped to the panel alone left that ✕ permanently
    // unreachable from the keyboard. `ui/Modal` spans the whole dialog for exactly this reason.
    mount();
    const panel = screen.getByRole("dialog");
    act(() => void notify({ level: "error", message: "offline" }));
    try {
      const dismissToast = screen.getByTitle("notifications.dismiss");
      expect(panel.contains(dismissToast)).toBe(false);
      const stops = [...panel.querySelectorAll<HTMLElement>("button, a[href]")];
      stops[stops.length - 1]!.focus();
      fireEvent.keyDown(window, { key: "Tab" });
      // No longer the edge: Tab carries on (natively) towards the toast instead of wrapping.
      expect(document.activeElement).toBe(stops[stops.length - 1]);
      dismissToast.focus();
      fireEvent.keyDown(window, { key: "Tab" });
      expect(document.activeElement).toBe(stops[0]);
    } finally {
      act(() => clearAll());
    }
  });
});