// @vitest-environment jsdom
//
// E22 S5: Settings → Diagnosztika. Raising the level is a consent, so choosing Részletes or Teljes
// must change NOTHING until the consent box's own button is pressed; going back to Alap needs no
// consent. i18n is a key-passthrough (with the count, so the retention days are visible); the level
// endpoint is stubbed, and `me` lives in a real query cache so a saved level re-renders like in the app.
import { afterEach, describe, expect, it, vi } from "vitest";
import { cleanup, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

import type { DiagnosticsLevel, DiagnosticsState, Me } from "../lib/api";
import { qk } from "../lib/queryKeys";

vi.mock("react-i18next", async (importOriginal) => {
  const actual = await importOriginal<typeof import("react-i18next")>();
  return {
    ...actual,
    useTranslation: () => ({
      t: (key: string, opts?: { count?: number; h?: number; m?: number; time?: string }) =>
        opts?.count != null
          ? `${key}:${opts.count}`
          : opts?.m != null
            ? `${key}:${opts.h ?? 0}h${opts.m}m`
            : opts?.time != null
              ? `${key}:${opts.time}`
              : key,
      i18n: { language: "en" },
    }),
  };
});

const setLevel = vi.fn(
  (level: DiagnosticsLevel): Promise<{ ok: true; diagnostics: DiagnosticsState }> =>
    Promise.resolve({
      ok: true,
      diagnostics: {
        level,
        until: level === "INFO" ? null : new Date(Date.now() + 86_400_000).toISOString(),
        retention_days: 7,
        session_minutes: 60,
      },
    }),
);
vi.mock("../lib/api", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../lib/api")>();
  return {
    ...actual,
    api: { ...actual.api, setDiagnosticsLevel: (l: DiagnosticsLevel) => setLevel(l) },
  };
});

import DiagnosticsSettings from "./DiagnosticsSettings";

afterEach(() => {
  cleanup();
  vi.clearAllMocks();
});

function mount(me: Partial<Me>) {
  const qc = new QueryClient();
  qc.setQueryData(qk.me(), {
    id: 1,
    is_demo: false,
    preferences: {},
    diagnostics: { level: "INFO", until: null, retention_days: 7, session_minutes: 60 },
    ...me,
  });
  render(
    <QueryClientProvider client={qc}>
      <DiagnosticsSettings />
    </QueryClientProvider>,
  );
  return qc;
}

const levelButton = (name: string) =>
  within(screen.getByRole("group", { name: "settings.diagnostics.level" })).getByRole("button", {
    name,
  });

describe("DiagnosticsSettings", () => {
  it("choosing a detailed level asks first and changes nothing until confirmed", async () => {
    mount({});
    fireEvent.click(levelButton("settings.diagnostics.levels.DEBUG"));
    const consent = screen.getByTestId("diagnostics-consent");
    expect(consent.textContent).toContain("settings.diagnostics.consent.what.DEBUG");
    expect(consent.textContent).toContain("settings.diagnostics.consent.server:7");
    expect(setLevel).not.toHaveBeenCalled();

    fireEvent.click(
      within(consent).getByRole("button", { name: "settings.diagnostics.consent.cancel" }),
    );
    expect(screen.queryByTestId("diagnostics-consent")).toBeNull();
    expect(levelButton("settings.diagnostics.levels.INFO").getAttribute("aria-pressed")).toBe(
      "true",
    );
    expect(setLevel).not.toHaveBeenCalled();
  });

  it("the consent button raises the level, and the status line offers the way back", async () => {
    mount({});
    fireEvent.click(levelButton("settings.diagnostics.levels.TRACE"));
    fireEvent.click(screen.getByTestId("diagnostics-consent-confirm"));
    await waitFor(() => expect(screen.getByTestId("diagnostics-status")).toBeTruthy());
    expect(setLevel).toHaveBeenCalledWith("TRACE");
    expect(screen.queryByTestId("diagnostics-consent")).toBeNull();
    expect(levelButton("settings.diagnostics.levels.TRACE").getAttribute("aria-pressed")).toBe(
      "true",
    );

    fireEvent.click(screen.getByRole("button", { name: "settings.diagnostics.revert" }));
    await waitFor(() => expect(screen.queryByTestId("diagnostics-status")).toBeNull());
    expect(setLevel).toHaveBeenLastCalledWith("INFO");
  });

  it("counts the 24 hours from the moment the level was raised, not from when the page opened", async () => {
    vi.useFakeTimers({ toFake: ["Date"] });
    try {
      vi.setSystemTime(new Date("2026-09-19T02:54:00Z"));
      mount({});
      vi.setSystemTime(new Date("2026-09-19T02:56:30Z")); // the page sat open for 2.5 minutes
      fireEvent.click(levelButton("settings.diagnostics.levels.DEBUG"));
      fireEvent.click(screen.getByTestId("diagnostics-consent-confirm"));
      await waitFor(() => expect(screen.getByTestId("diagnostics-status")).toBeTruthy());
      expect(screen.getByTestId("diagnostics-status").textContent).toContain("24 hr 0 min");
    } finally {
      vi.useRealTimers();
    }
  });

  it("going back to the base level needs no consent", async () => {
    const until = new Date(Date.now() + 3_600_000).toISOString();
    mount({ diagnostics: { level: "DEBUG", until, retention_days: 7, session_minutes: 60 } });
    fireEvent.click(levelButton("settings.diagnostics.levels.INFO"));
    expect(screen.queryByTestId("diagnostics-consent")).toBeNull();
    await waitFor(() => expect(setLevel).toHaveBeenCalledWith("INFO"));
  });

  it("the focus goes back to the level picker when the box it was in goes away", async () => {
    mount({});
    fireEvent.click(levelButton("settings.diagnostics.levels.DEBUG"));
    const cancel = screen.getByRole("button", { name: "settings.diagnostics.consent.cancel" });
    cancel.focus();
    fireEvent.click(cancel);
    expect(document.activeElement).toBe(levelButton("settings.diagnostics.levels.INFO"));

    fireEvent.click(levelButton("settings.diagnostics.levels.TRACE"));
    const confirm = screen.getByTestId("diagnostics-consent-confirm");
    confirm.focus();
    fireEvent.click(confirm);
    await waitFor(() => expect(screen.getByTestId("diagnostics-status")).toBeTruthy());
    expect(document.activeElement).toBe(levelButton("settings.diagnostics.levels.TRACE"));

    const revert = screen.getByRole("button", { name: "settings.diagnostics.revert" });
    revert.focus();
    fireEvent.click(revert);
    await waitFor(() => expect(screen.queryByTestId("diagnostics-status")).toBeNull());
    expect(document.activeElement).toBe(levelButton("settings.diagnostics.levels.INFO"));
  });

  it("the watch outlives a render in which the element it is watching is still there", async () => {
    // The distinguishing property of the restore, and the one the browser found: it keeps looking
    // until the element is GONE, instead of spending itself on the first render after the change.
    // Chrome commits a saved level as two renders and jsdom as one, so this drives the general
    // case directly — the user moved the focus somewhere else while the request was out, and that
    // somewhere else disappears later, several renders on.
    vi.useFakeTimers();
    try {
      // Raised, so the status line's countdown is mounted and its 30 s tick keeps re-rendering.
      const until = new Date(Date.now() + 3_600_000).toISOString();
      mount({ diagnostics: { level: "DEBUG", until, retention_days: 7, session_minutes: 60 } });
      fireEvent.click(levelButton("settings.diagnostics.levels.TRACE"));
      const elsewhere = document.createElement("button");
      document.body.append(elsewhere);
      elsewhere.focus();

      // Cancel closes the box; the watch is armed on `elsewhere`, which is still in the page.
      fireEvent.click(screen.getByRole("button", { name: "settings.diagnostics.consent.cancel" }));
      expect(document.activeElement).toBe(elsewhere); // their place is kept, nothing is stolen

      // Renders keep coming (the countdown ticks) while it is still there, and must not spend it.
      await vi.advanceTimersByTimeAsync(60_000);
      expect(document.activeElement).toBe(elsewhere);

      elsewhere.remove(); // now the focus really has fallen to <body>
      expect(document.activeElement).toBe(document.body);
      await vi.advanceTimersByTimeAsync(30_000);
      expect(document.activeElement).toBe(levelButton("settings.diagnostics.levels.DEBUG"));
    } finally {
      vi.useRealTimers();
    }
  });

  it("the ticking status line is not a live region", async () => {
    const until = new Date(Date.now() + 3_600_000).toISOString();
    mount({ diagnostics: { level: "DEBUG", until, retention_days: 7, session_minutes: 60 } });
    const status = screen.getByTestId("diagnostics-status");
    expect(status.closest('[role="status"], [aria-live]')).toBeNull();
  });

  it("a `me` fetch that left before the change cannot put the old level back", async () => {
    const qc = mount({});
    let answerStale: (me: unknown) => void = () => {};
    const stale = qc
      .fetchQuery({
        queryKey: qk.me(),
        queryFn: () => new Promise((resolve) => (answerStale = resolve)),
      })
      .catch(() => null);
    fireEvent.click(levelButton("settings.diagnostics.levels.TRACE"));
    fireEvent.click(screen.getByTestId("diagnostics-consent-confirm"));
    await waitFor(() => expect(screen.getByTestId("diagnostics-status")).toBeTruthy());
    answerStale({
      id: 1,
      is_demo: false,
      preferences: {},
      diagnostics: { level: "INFO", until: null, retention_days: 7, session_minutes: 60 },
    });
    await stale;
    expect(qc.getQueryData<Me>(qk.me())?.diagnostics.level).toBe("TRACE");
    expect(screen.getByTestId("diagnostics-status")).toBeTruthy();
  });

  it("a lapsed level shows as the base level", () => {
    const until = new Date(Date.now() - 60_000).toISOString();
    mount({ diagnostics: { level: "TRACE", until, retention_days: 7, session_minutes: 60 } });
    expect(levelButton("settings.diagnostics.levels.INFO").getAttribute("aria-pressed")).toBe(
      "true",
    );
    expect(screen.queryByTestId("diagnostics-status")).toBeNull();
  });

  it("the shared demo account gets an explanation instead of the picker", () => {
    mount({ is_demo: true });
    expect(screen.queryByRole("group", { name: "settings.diagnostics.level" })).toBeNull();
    expect(screen.getByText("settings.diagnostics.demo")).toBeTruthy();
  });
});