// @vitest-environment jsdom
//
// The count pill while a new search's count loads. keepPreviousData holds the last filter's count, and a
// broad word's count takes seconds ("a": ~3 s on the prod-sized library): the pill showed the old
// number as if it were the new search's. It now dims and is aria-busy until the new count lands.
import { describe, it, expect, vi, beforeAll, afterEach } from "vitest";
import { render, screen, waitFor, cleanup } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

vi.mock("react-i18next", async (importOriginal) => ({
  ...(await importOriginal<typeof import("react-i18next")>()),
  useTranslation: () => ({ t: (key: string) => key, i18n: { language: "en" } }),
}));
vi.mock("./wizardContext", () => ({ useWizard: () => ({ openWizard: vi.fn() }) }));
vi.mock("./VirtualFeed", () => ({ default: () => null }));
vi.mock("./SelectedViewChip", () => ({ default: () => null }));
vi.mock("./ActiveFilterChips", () => ({ default: () => null }));

import Feed from "./Feed";
import { api, DEFAULT_TAG_MODES, type FeedFilters } from "../lib/api";
import { qk } from "../lib/queryKeys";
import type { ReactElement } from "react";
import { PageToolbarSlot } from "./ui/pageToolbarSlot";

beforeAll(() => {
  class Stub {
    observe() {}
    unobserve() {}
    disconnect() {}
    takeRecords() {
      return [];
    }
  }
  globalThis.ResizeObserver ??= Stub as unknown as typeof ResizeObserver;
  globalThis.IntersectionObserver ??= Stub as unknown as typeof IntersectionObserver;
});
afterEach(() => {
  cleanup();
  vi.restoreAllMocks();
});

const FILTERS: FeedFilters = {
  tags: [],
  tagModes: DEFAULT_TAG_MODES,
  channelIds: [],
  q: "",
  sort: "newest",
  scope: "my",
  includeNormal: true,
  includeShorts: false,
  includeLive: false,
  show: "unwatched",
};

// The pill lives in the toolbar, which portals into the shell's band: give it one.
const slot = document.body.appendChild(document.createElement("div"));
const feed = (q: string, qc: QueryClient): ReactElement => (
  <QueryClientProvider client={qc}>
    <PageToolbarSlot.Provider value={slot}>
      <Feed
        filters={{ ...FILTERS, q }}
        setFilters={() => {}}
        view="cards"
        setView={() => {}}
        canRead
        ytSearch=""
        onYtSearch={() => {}}
        onExitYtSearch={() => {}}
      />
    </PageToolbarSlot.Provider>
  </QueryClientProvider>
);

describe("Feed — the count while a new search's count loads", () => {
  it("dims the previous count and marks it busy until the new one lands", async () => {
    vi.spyOn(api, "feed").mockResolvedValue({ items: [], next_cursor: null } as never);
    let settle: (v: unknown) => void = () => {};
    vi.spyOn(api, "feedSummary").mockImplementation(((f: FeedFilters) =>
      f.q === "kitchen"
        ? Promise.resolve({ count: 1937, facets: {} })
        : new Promise((r) => (settle = r))) as never);
    const qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
    qc.setQueryData(qk.me(), { id: 1, can_write: true, prefs: {} });
    const pill = () => screen.getByTestId("item-count");

    const view = render(feed("kitchen", qc));
    await waitFor(() => expect(pill().getAttribute("title")).toBe("1,937"));
    expect(pill().getAttribute("aria-busy")).toBeNull();

    view.rerender(feed("a", qc));
    await waitFor(() => expect(pill().getAttribute("aria-busy")).toBe("true"));
    expect(pill().getAttribute("title")).toBe("1,937"); // still the old figure, now marked as such

    settle({ count: 178991, facets: {} });
    await waitFor(() => expect(pill().getAttribute("title")).toBe("178,991"));
    expect(pill().getAttribute("aria-busy")).toBeNull();
  });

  it("says the count failed instead of showing the empty box of a first load", async () => {
    vi.spyOn(api, "feed").mockResolvedValue({ items: [], next_cursor: null } as never);
    vi.spyOn(api, "feedSummary").mockImplementation(((f: FeedFilters) =>
      f.q === "kitchen"
        ? Promise.resolve({ count: 1937, facets: {} })
        : Promise.reject(new Error("boom"))) as never);
    const qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
    qc.setQueryData(qk.me(), { id: 1, can_write: true, prefs: {} });
    const pill = () => screen.getByTestId("item-count");

    const view = render(feed("kitchen", qc));
    await waitFor(() => expect(pill().getAttribute("title")).toBe("1,937"));
    view.rerender(feed("a", qc));
    await waitFor(() => expect(pill().getAttribute("title")).toBe("common.countFailed"));
    expect(pill().getAttribute("aria-busy")).toBeNull();
  });
});