// @vitest-environment jsdom
//
// A channel filter's chips are named from the subscription list, which a reload has not fetched yet:
// they used to read as raw UC… ids for a moment (the owner, 2026-10-03). The names seen last time now
// name them until the list lands; a channel never named on this browser draws a placeholder instead.
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { act, cleanup, render, renderHook, screen, waitFor } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
import { createElement, type ReactNode } from "react";
import { api, type FeedFilters, type ManagedChannel } from "../lib/api";
import { ACTIVE_ACCOUNT_KEY } from "../lib/activeAccount";
import { accountKey, LS } from "../lib/storage";
import { clearedFilters, useActiveFilters } from "../lib/useActiveFilters";
import ActiveFilterChips from "./ActiveFilterChips";
import ChannelPicker from "./ChannelPicker";

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

const KNOWN = "UCknown0000000000000000";
const NEW = "UCnever00000000000000000";
const filters: FeedFilters = {
  ...clearedFilters({ q: "" } as FeedFilters),
  channelIds: [KNOWN, NEW],
};
const namesKey = () => accountKey(LS.channelNames, 5)!;

let resolveChannels: (c: ManagedChannel[]) => void;
let qc: QueryClient;
const wrapper = ({ children }: { children: ReactNode }) =>
  createElement(QueryClientProvider, { client: qc }, children);

beforeEach(() => {
  localStorage.clear();
  sessionStorage.setItem(ACTIVE_ACCOUNT_KEY, "5");
  localStorage.setItem(namesKey(), JSON.stringify({ [KNOWN]: "Remembered name" }));
  qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
  vi.spyOn(api, "tags").mockResolvedValue([] as never);
  vi.spyOn(api, "channels").mockReturnValue(
    new Promise<ManagedChannel[]>((r) => {
      resolveChannels = r;
    }),
  );
});
afterEach(() => {
  cleanup();
  vi.restoreAllMocks();
});

const land = async () => {
  await act(async () => {
    resolveChannels([
      { id: KNOWN, title: "Renamed since" },
      { id: NEW, title: "Brand new" },
    ] as ManagedChannel[]);
  });
};

describe("a channel filter's chip names", () => {
  it("name a remembered channel before the list lands, and hold the rest as pending", async () => {
    const { result } = renderHook(() => useActiveFilters(filters, () => {}), { wrapper });
    const chip = (id: string) => result.current.find((f) => f.key === `channel:${id}`)!;
    expect(chip(KNOWN)).toMatchObject({ label: "Remembered name", pending: false });
    expect(chip(NEW)).toMatchObject({ label: NEW, pending: true });

    await land();
    await waitFor(() => expect(chip(NEW)).toMatchObject({ label: "Brand new", pending: false }));
    // The list wins over the remembered copy, and replaces it for the next reload.
    expect(chip(KNOWN).label).toBe("Renamed since");
    expect(JSON.parse(localStorage.getItem(namesKey())!)).toEqual({
      [KNOWN]: "Renamed since",
      [NEW]: "Brand new",
    });
  });

  it("draw a placeholder above the feed, not the raw id", () => {
    const { result } = renderHook(() => useActiveFilters(filters, () => {}), { wrapper });
    const { container } = render(
      <ActiveFilterChips filters={result.current} onClearAll={() => {}} />,
    );
    expect(screen.getAllByText("Remembered name").length).toBeGreaterThan(0);
    // The id is only a screen reader's (sr-only), beside a bone; nothing paints it.
    for (const el of screen.getAllByText(NEW)) expect(el.className).toBe("sr-only");
    expect(container.querySelectorAll(".animate-pulse").length).toBeGreaterThan(0);
  });

  it("draw a placeholder in the filter panel's picker, then the name", async () => {
    const { container } = render(<ChannelPicker filters={filters} setFilters={() => {}} />, {
      wrapper,
    });
    screen.getByText("Remembered name");
    expect(screen.getByText(NEW).className).toBe("sr-only");
    expect(container.querySelectorAll(".animate-pulse")).toHaveLength(1);

    await land();
    await waitFor(() => screen.getByText("Brand new"));
    expect(screen.queryByText(NEW)).toBeNull();
    expect(container.querySelectorAll(".animate-pulse")).toHaveLength(0);
  });

  it("fall back to the id when the list fails, so each chip stays told apart", async () => {
    localStorage.removeItem(namesKey());
    vi.spyOn(api, "channels").mockRejectedValue(new Error("down"));
    const { result } = renderHook(() => useActiveFilters(filters, () => {}), { wrapper });
    await waitFor(() =>
      expect(result.current.find((f) => f.key === `channel:${NEW}`)).toMatchObject({
        label: NEW,
        pending: false,
      }),
    );
  });
});