// @vitest-environment jsdom
//
// S2 — the single default-application path. On the saved-views query's FIRST resolve, SavedViewsProvider
// seeds the starred default view's filters into a genuinely fresh module (no stored filters), for BOTH
// the feed and Plex — but leaves them alone once the account has its own stored filters. This is the
// fix for the old feed-only LS mirror that raced FeedFiltersProvider's login effect and never applied a
// Plex default at all. The sub-providers are mocked so we can assert exactly which setFilters is called;
// api.savedViews is stubbed and driven through a real QueryClient.
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { render, screen, waitFor, cleanup, act } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

const h = vi.hoisted(() => ({
  page: "feed" as "feed" | "plex",
  setFeedFilters: vi.fn(),
  setPlexFilters: vi.fn(),
}));

vi.mock("react-i18next", async (importOriginal) => {
  const actual = await importOriginal<typeof import("react-i18next")>();
  return { ...actual, useTranslation: () => ({ t: (key: string) => key }) };
});
vi.mock("./NavigationProvider", () => ({ useNavigation: () => ({ page: h.page }) }));
vi.mock("./FeedFiltersProvider", () => ({
  useFeedFilters: () => ({
    tags: [],
    channelIds: [],
    tagModes: { language: "or", topic: "or", other: "or" },
    q: "",
    sort: "newest",
    scope: "my",
    includeNormal: true,
    includeShorts: false,
    includeLive: false,
    show: "unwatched",
  }),
  useFeedFiltersActions: () => ({ setFilters: h.setFeedFilters }),
}));
vi.mock("./PlexProvider", () => ({
  usePlex: () => ({ filters: {} }),
  usePlexActions: () => ({ setFilters: h.setPlexFilters }),
}));
vi.mock("./ConfirmProvider", () => ({ useConfirm: () => async () => true }));

import { SavedViewsProvider, useSavedViews } from "./SavedViewsProvider";
import { api, setActiveAccount, type SavedView } from "../lib/api";
import { LS, accountKey } from "../lib/storage";
import { ACTIVE_ACCOUNT_KEY } from "../lib/activeAccount";
import { qk } from "../lib/queryKeys";

const ID = 7;
const view = (over: Partial<SavedView>): SavedView => ({
  id: 1,
  name: "v",
  filters: {},
  position: 0,
  is_default: false,
  ...over,
});

function Probe() {
  const { loading, views } = useSavedViews();
  return (
    <div data-testid="loading" data-count={views.length}>
      {String(loading)}
    </div>
  );
}

async function mountResolved(views: SavedView[]) {
  // Fresh array + object copies per call, like a real fetch — so a refetch changes viewsQuery.data's
  // identity and re-runs the seed effect (which is what makes the per-source guard actually load-bearing
  // in the re-seed test; a shared reference would skip the effect and hide a missing guard).
  vi.spyOn(api, "savedViews").mockImplementation(async () => views.map((v) => ({ ...v })));
  const qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
  render(
    <QueryClientProvider client={qc}>
      <SavedViewsProvider>
        <Probe />
      </SavedViewsProvider>
    </QueryClientProvider>,
  );
  // Wait for the query to resolve so the first-resolve effect has run.
  await waitFor(() => expect(screen.getByTestId("loading").textContent).toBe("false"));
  return qc;
}

beforeEach(() => {
  localStorage.clear();
  sessionStorage.setItem(ACTIVE_ACCOUNT_KEY, String(ID));
  // Reset the URL: feedCanSeedDefault reads window.location.search, and a stale ?sort= from a prior
  // case would suppress seeding in the others.
  window.history.replaceState({}, "", "/");
  h.page = "feed";
  h.setFeedFilters.mockClear();
  h.setPlexFilters.mockClear();
});
afterEach(() => {
  cleanup();
  vi.restoreAllMocks();
});

describe("SavedViewsProvider — default-view seeding on first resolve", () => {
  it("feed: seeds the starred default into a fresh module (no stored filters)", async () => {
    await mountResolved([
      view({ id: 2, is_default: true, filters: { scope: "all", show: "watched" } }),
    ]);
    expect(h.setFeedFilters).toHaveBeenCalledTimes(1);
    expect(h.setFeedFilters.mock.calls[0]![0]).toMatchObject({ scope: "all", show: "watched" });
  });

  it("feed: on a fresh tab the query resolves before the account pins — defers, then seeds on the pin", async () => {
    // The provider mounts above <App>, which pins the tab-account only after /api/me; the ungated
    // views query resolves first. Seeding must WAIT for the account (not seed nothing and burn its
    // one-shot — the pre-fix regression that left a fresh tab on DEFAULT_FILTERS until a reload).
    sessionStorage.removeItem(ACTIVE_ACCOUNT_KEY);
    await mountResolved([
      view({ id: 2, is_default: true, filters: { scope: "all", show: "watched" } }),
    ]);
    expect(h.setFeedFilters).not.toHaveBeenCalled();
    // App pins the account; the reactive id re-fires the effect and the deferred seed lands.
    act(() => setActiveAccount(ID));
    await waitFor(() => expect(h.setFeedFilters).toHaveBeenCalledTimes(1));
    expect(h.setFeedFilters.mock.calls[0]![0]).toMatchObject({ scope: "all", show: "watched" });
  });

  it("feed: does NOT seed when the account already has stored filters", async () => {
    localStorage.setItem(accountKey(LS.filters, ID)!, JSON.stringify({ scope: "my" }));
    await mountResolved([view({ id: 2, is_default: true, filters: { scope: "all" } })]);
    expect(h.setFeedFilters).not.toHaveBeenCalled();
  });

  it("feed: does NOT seed when no view is starred as default", async () => {
    await mountResolved([view({ id: 2, is_default: false, filters: { scope: "all" } })]);
    expect(h.setFeedFilters).not.toHaveBeenCalled();
  });

  it("feed: does NOT seed when the URL carries filter params (a shared/bookmarked view wins)", async () => {
    // A link like ?sort=oldest is an explicit filter the user arrived on; the starred default must not
    // stomp it. feedCanSeedDefault() bails on hasFilterParams — plex ignores the URL, so this is feed-only.
    window.history.replaceState({}, "", "/?sort=oldest");
    await mountResolved([
      view({ id: 2, is_default: true, filters: { scope: "all", show: "watched" } }),
    ]);
    expect(h.setFeedFilters).not.toHaveBeenCalled();
  });

  it("does NOT re-seed on a background refetch that returns a changed list (per-source one-shot guard)", async () => {
    // The 60s refetch re-resolves the query; when it returns a CHANGED list (e.g. the user just added a
    // view elsewhere) react-query hands down a new reference and the seed effect re-runs. seededRef must
    // stop it re-applying the default over filters the user has since edited. (An identical refetch is
    // deduped by structural sharing and never reaches the effect, so the changed list is the real test.)
    const def = view({ id: 2, is_default: true, filters: { scope: "all", show: "watched" } });
    let calls = 0;
    vi.spyOn(api, "savedViews").mockImplementation(async () => {
      calls += 1;
      return calls === 1 ? [def] : [def, view({ id: 9, name: "added-later" })];
    });
    const qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
    render(
      <QueryClientProvider client={qc}>
        <SavedViewsProvider>
          <Probe />
        </SavedViewsProvider>
      </QueryClientProvider>,
    );
    await waitFor(() => expect(screen.getByTestId("loading").textContent).toBe("false"));
    expect(h.setFeedFilters).toHaveBeenCalledTimes(1);
    await act(async () => {
      await qc.refetchQueries({ queryKey: qk.savedViews("feed") });
    });
    // Wait until the changed list has actually reached the component, so the seed effect has had its
    // chance to (wrongly) re-fire — otherwise the assertion could win by racing ahead of the re-render.
    await waitFor(() => expect(screen.getByTestId("loading").dataset.count).toBe("2"));
    expect(h.setFeedFilters).toHaveBeenCalledTimes(1);
  });

  it("plex: seeds the starred default into a fresh module (parity with the feed)", async () => {
    h.page = "plex";
    await mountResolved([view({ id: 3, is_default: true, filters: { genres: ["Action"] } })]);
    expect(h.setPlexFilters).toHaveBeenCalledTimes(1);
    expect(h.setPlexFilters.mock.calls[0]![0]).toMatchObject({ genres: ["Action"] });
  });

  it("plex: does NOT seed when plex filters are already stored", async () => {
    h.page = "plex";
    localStorage.setItem(accountKey(LS.plexFilters, ID)!, JSON.stringify({ genres: ["Comedy"] }));
    await mountResolved([view({ id: 3, is_default: true, filters: { genres: ["Action"] } })]);
    expect(h.setPlexFilters).not.toHaveBeenCalled();
  });
});