// @vitest-environment jsdom
//
// A video marked watched in the player (by hand, or by the player at its end) left an Unwatched view
// at once, then came back as "new" when the player closed, until a reload (owner, on a channel page).
// The player's closing position patch writes into the cached feed, which bumped `dataUpdatedAt`; the
// feed took that for fresh server data and dropped its optimistic overrides, and nothing refetched.
// The grid and the player are stubs that show what Feed hands them.
import { describe, it, expect, vi, beforeAll, afterEach } from "vitest";
import { render, screen, fireEvent, waitFor, cleanup, act } 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("../../features/wizard/wizardContext", () => ({
  useWizard: () => ({ openWizard: vi.fn() }),
}));
// What the grid was handed for its card menu's channel-filter row.
const grid: { channelFilter?: { ids: string[]; set: (ids: string[]) => void } } = {};
vi.mock("./VirtualFeed", () => ({
  default: ({
    items,
    onOpen,
    channelFilter,
  }: {
    items: { id: string }[];
    onOpen: (v: unknown) => void;
    channelFilter?: { ids: string[]; set: (ids: string[]) => void };
  }) => (
    (grid.channelFilter = channelFilter),
    (
      <ol aria-label="results">
        {items.map((v) => (
          <li key={v.id}>
            {v.id}
            <button onClick={() => onOpen(v)}>open {v.id}</button>
          </li>
        ))}
      </ol>
    )
  ),
}));
// The player's progress hook marks a clip closed near its end watched from its unmount cleanup:
// `watchOnUnmount` stands in for that, and `flush` for its closing checkpoint, which it tracks.
const player = vi.hoisted(() => ({
  watchOnUnmount: false,
  flush: null as Promise<unknown> | null,
}));
vi.mock("../../features/player/PlayerModal", async () => {
  const { useEffect } = await import("react");
  const { trackProgressFlush } = await import("../../lib/progressCache");
  return {
    default: function Player({
      video,
      queue,
      onState,
      onWrite,
      onClose,
    }: {
      video: { id: string };
      queue?: { id: string }[];
      onState: (id: string, status: string, v?: unknown) => void;
      onWrite?: (write: Promise<unknown>) => void;
      onClose: () => void;
    }) {
      useEffect(
        () => () => {
          if (player.watchOnUnmount) onState(video.id, "watched");
          if (player.flush) trackProgressFlush(player.flush);
        },
        [video.id, onState],
      );
      return (
        <div>
          <p>
            playing {video.id} in {queue ? queue.map((v) => v.id).join(",") : "no list"}
          </p>
          <button onClick={() => onState(video.id, "watched")}>mark</button>
          <button
            onClick={() =>
              onState("rel1", "watched", {
                id: "rel1",
                title: "Related one",
                channel_id: "UCr",
                channel_title: "Rel channel",
              })
            }
          >
            mark related
          </button>
          <button onClick={() => onWrite?.(Promise.resolve())}>related list wrote</button>
          <button onClick={onClose}>close</button>
        </div>
      );
    },
  };
});

import Feed from "./Feed";
import { api, DEFAULT_TAG_MODES, type FeedFilters, type Video } from "../../lib/api";
import { qk } from "../../lib/queryKeys";
import { patchCachedProgress } from "../../lib/progressCache";
import { clearAll, getNotifications } from "../../lib/notifications";

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();
  player.watchOnUnmount = false;
  player.flush = null;
  clearAll();
  window.history.replaceState(null, "", "/");
});

// A cached related list (the player's, kept for the session) holding these videos.
const seedRelated = (qc: QueryClient, ...ids: string[]) =>
  qc.setQueryData(qk.related("SRC", "topical"), {
    pages: [
      { items: ids.map((id) => ({ id, status: "new" })), has_more: false, next_cursor: null },
    ],
    pageParams: [null],
  });
const relatedStatus = (qc: QueryClient, id: string) =>
  (
    qc.getQueryData(qk.related("SRC", "topical")) as {
      pages: { items: { id: string; status: string }[] }[];
    }
  ).pages[0]!.items.find((v) => v.id === id)?.status;

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

const video = (status: string, position = 0) =>
  ({
    id: "v1",
    title: "v1",
    channel_id: "UCx",
    channel_title: "Channel",
    status,
    position_seconds: position,
    duration_seconds: 600,
    published_at: "2026-01-01T00:00:00Z",
    watch_url: "https://www.youtube.com/watch?v=v1",
  }) as unknown as Video;

function mount({
  channelScoped = true,
  setFilters = () => {},
}: { channelScoped?: boolean; setFilters?: (f: FeedFilters) => void } = {}) {
  const feed = vi
    .spyOn(api, "feed")
    .mockResolvedValueOnce({ items: [video("new")], next_cursor: null } as never)
    // The server after the mark: watched, so an Unwatched view leaves it out.
    .mockResolvedValue({ items: [], next_cursor: null } as never);
  const summary = vi.spyOn(api, "feedSummary").mockResolvedValue({ count: 1, facets: {} } as never);
  vi.spyOn(api, "setState").mockResolvedValue({ ok: true } as never);
  const qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
  qc.setQueryData(qk.me(), { id: 1, can_write: true, prefs: {} });
  render(
    <QueryClientProvider client={qc}>
      <Feed
        filters={FILTERS}
        setFilters={setFilters}
        view="cards"
        setView={() => {}}
        canRead
        ytSearch={null}
        onYtSearch={() => {}}
        onExitYtSearch={() => {}}
        channelScoped={channelScoped}
      />
    </QueryClientProvider>,
  );
  return { qc, feed, summary };
}

// The URL is the view: a reload or a bookmark of the player reopens it once the list is in.
describe("Feed — a player the address names", () => {
  it("reopens on its video, the list as its queue", async () => {
    window.history.replaceState(null, "", "/?watch=v1");
    mount();
    expect(await screen.findByText("playing v1 in v1")).toBeTruthy();
  });

  it("plays a video the loaded list does not hold alone, from the catalog", async () => {
    window.history.replaceState(null, "", "/?watch=far");
    const row = vi.spyOn(api, "videoRow").mockResolvedValue({ ...video("new"), id: "far" });
    mount();
    expect(await screen.findByText("playing far in no list")).toBeTruthy();
    expect(row).toHaveBeenCalledWith("far");
  });
});

describe("Feed — a video marked watched in the player", () => {
  it("stays out of an Unwatched view when the player writes its position into the cache", async () => {
    const { qc } = mount();
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("mark"));
    await waitFor(() => expect(screen.queryByText("open v1")).toBeNull());
    // What the player does as it closes: the server's stored position, written into the cached list.
    act(() => patchCachedProgress(qc, new Map([["v1", 10]])));
    await new Promise((r) => setTimeout(r, 20));
    expect(screen.queryByText("open v1")).toBeNull();
  });

  it("refetches the list and its count by the view's filters when the player closes", async () => {
    const { feed, summary } = mount();
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("mark"));
    const before = { feed: feed.mock.calls.length, summary: summary.mock.calls.length };
    fireEvent.click(screen.getByText("close"));
    await waitFor(() => expect(feed.mock.calls.length).toBeGreaterThan(before.feed));
    await waitFor(() => expect(summary.mock.calls.length).toBeGreaterThan(before.summary));
    // The refetch is the channel's Unwatched list, and the server's answer keeps the card out.
    expect(feed.mock.calls[feed.mock.calls.length - 1]?.[0]).toMatchObject({
      channelIds: ["UCx"],
      show: "unwatched",
    });
    await new Promise((r) => setTimeout(r, 20));
    expect(screen.queryByText("open v1")).toBeNull();
  });

  it("refetches when the player marks the clip watched as it closes", async () => {
    const { feed } = mount();
    fireEvent.click(await screen.findByText("open v1"));
    player.watchOnUnmount = true;
    const before = feed.mock.calls.length;
    fireEvent.click(await screen.findByText("close"));
    await waitFor(() => expect(feed.mock.calls.length).toBeGreaterThan(before));
  });

  it("waits for the session's writes to land before it refetches", async () => {
    const { feed } = mount();
    let land: (v: unknown) => void = () => {};
    vi.mocked(api.setState).mockReturnValue(new Promise((r) => (land = r)) as never);
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("mark"));
    const before = feed.mock.calls.length;
    fireEvent.click(screen.getByText("close"));
    await act(() => new Promise((r) => setTimeout(r, 30)));
    // A refetch now would ask a server that has not taken the mark yet.
    expect(feed.mock.calls.length).toBe(before);
    await act(async () => land({ ok: true }));
    await waitFor(() => expect(feed.mock.calls.length).toBeGreaterThan(before));
  });

  it("waits for the player's closing checkpoint before it refetches", async () => {
    // Refetched before that write landed, the list read the older position and, landing after the
    // player's patch, put it back: a reopen resumed early.
    const { feed } = mount();
    let land: (v: unknown) => void = () => {};
    player.flush = new Promise((r) => (land = r));
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("mark"));
    const before = feed.mock.calls.length;
    fireEvent.click(screen.getByText("close"));
    await act(() => new Promise((r) => setTimeout(r, 30)));
    expect(feed.mock.calls.length).toBe(before);
    await act(async () => land(undefined));
    await waitFor(() => expect(feed.mock.calls.length).toBeGreaterThan(before));
  });

  it("refetches when the player's related list wrote", async () => {
    const { feed } = mount();
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("related list wrote"));
    const before = feed.mock.calls.length;
    fireEvent.click(screen.getByText("close"));
    await waitFor(() => expect(feed.mock.calls.length).toBeGreaterThan(before));
  });

  it("names a video that is none of its own in the notice", async () => {
    mount();
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("mark related"));
    await waitFor(() =>
      expect(getNotifications().map((n) => n.meta)).toContainEqual({
        kind: "video-watched",
        videoId: "rel1",
        title: "Related one",
        channelId: "UCr",
        channelName: "Rel channel",
      }),
    );
  });

  it("puts the mark into the player's related lists, which are never refetched", async () => {
    const { qc } = mount();
    seedRelated(qc, "v1", "other");
    fireEvent.click(await screen.findByText("open v1"));
    fireEvent.click(await screen.findByText("mark"));
    await waitFor(() => expect(relatedStatus(qc, "v1")).toBe("watched"));
    expect(relatedStatus(qc, "other")).toBe("new");
  });

  it("does not refetch on a close with nothing changed", async () => {
    const { feed } = mount();
    fireEvent.click(await screen.findByText("open v1"));
    const before = feed.mock.calls.length;
    fireEvent.click(await screen.findByText("close"));
    await new Promise((r) => setTimeout(r, 30));
    expect(feed.mock.calls.length).toBe(before);
  });
});

describe("Feed — the card menu's channel filter", () => {
  it("is offered on the feed, as its own channel list, and sets it", async () => {
    const setFilters = vi.fn();
    mount({ channelScoped: false, setFilters });
    await screen.findByText("open v1");
    expect(grid.channelFilter?.ids).toEqual(["UCx"]);
    grid.channelFilter?.set(["UCx", "UCy"]);
    expect(setFilters).toHaveBeenCalledWith({ ...FILTERS, channelIds: ["UCx", "UCy"] });
  });

  it("is not offered on a channel page, whose view is that channel already", async () => {
    mount({ channelScoped: true });
    await screen.findByText("open v1");
    expect(grid.channelFilter).toBeUndefined();
  });
});