// @vitest-environment jsdom
//
// The scheduler's two number editors — a job's interval and the maintenance batch size. Both used to
// hold a MIRROR of the server value that an effect re-synced; both now show the server value and keep
// a draft only while the field is being edited. That matters here more than elsewhere
// because this page polls: every few seconds a fresh status arrives, and a mirror is exactly the
// thing a poll can overwrite at the wrong moment.
import { describe, it, expect, vi, afterEach, beforeEach } from "vitest";
import { render, screen, fireEvent, cleanup, act, waitFor, within } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

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

import Scheduler from "./Scheduler";
import { NavigationActionsContext } from "./navigationContext";
import { api, type RunBrief, type SchedulerAdHoc, type SchedulerStatus } from "../lib/api";
import { qk } from "../lib/queryKeys";

const status = (over: Partial<SchedulerStatus> = {}): SchedulerStatus => ({
  running_here: true,
  enabled: true,
  paused: false,
  jobs: [
    {
      id: "sync",
      interval_minutes: 30,
      next_run: null,
      running: false,
      status: "ok",
      last_started: null,
      last_finished: null,
      last_result: null,
      result: null,
      last_error: null,
      last_trigger: null,
      last_run_id: null,
      quota_units: null,
      recent: [],
      progress: null,
    },
  ],
  ad_hoc: [],
  queue: {
    channels_recent_pending: 0,
    channels_deep_pending: 0,
    deep_eta_seconds: 0,
    videos_pending_enrich: 0,
    videos_pending_shorts: 0,
    videos_live_refresh: 0,
  },
  quota: { used_today: 0, remaining_today: 100, daily_budget: 100, backfill_reserve: 0 },
  maintenance: { revalidate_batch: 5000, revalidate_batch_default: 5000, min: 1000, max: 50000 },
  ...over,
});

let qc: QueryClient;
let current: SchedulerStatus;

async function mount(initial = status()) {
  current = initial;
  qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
  render(
    <QueryClientProvider client={qc}>
      <Scheduler />
    </QueryClientProvider>,
  );
  await screen.findByText("scheduler.maintenance.batchLabel");
}

/** A poll landing, driven through the query the page actually makes. */
async function poll(next: SchedulerStatus) {
  current = next;
  await act(() => qc.refetchQueries({ queryKey: qk.scheduler() }));
}

beforeEach(() => {
  vi.spyOn(api, "schedulerStatus").mockImplementation(() => Promise.resolve(current));
});
afterEach(() => {
  cleanup();
  vi.restoreAllMocks();
});

const intervalBox = () => screen.queryByRole("spinbutton", { name: "" });
const batchBox = () => screen.getByLabelText("scheduler.maintenance.batchLabel");

// The FIRST FOUR tests below are CHARACTERIZATION, not regression guards for the draft sweep: the old
// JobRow's re-sync effect was already guarded by `if (!editing)` and the mirror only rendered while
// editing, so each of those four passes against the pre-sweep code too. They are here because the
// editor had no tests at all. The two after them — the range refusal and the focus return — ARE
// regression guards, for the silent-discard fix, and they fail against the code this file shipped
// with. The editor that genuinely lost the user's typing to a poll is the maintenance batch box
// below: its old effect had no guard, and that one has its own test.
describe("Scheduler · the job interval editor", () => {
  it("opens on the current interval and commits a new one", async () => {
    const update = vi.spyOn(api, "updateSchedulerJob").mockResolvedValue(undefined as never);
    await mount();

    fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
    const box = intervalBox()!;
    expect(box).toHaveProperty("value", "30");

    fireEvent.change(box, { target: { value: "45" } });
    fireEvent.keyDown(box, { key: "Enter" });
    expect(intervalBox()).toBeNull(); // committing closes the editor at once
    await waitFor(() => expect(update).toHaveBeenCalledWith("sync", 45));
  });

  it("drops what you typed on Escape and shows the server's value again", async () => {
    const update = vi.spyOn(api, "updateSchedulerJob").mockResolvedValue(undefined as never);
    await mount();

    fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
    fireEvent.change(intervalBox()!, { target: { value: "999" } });
    fireEvent.keyDown(intervalBox()!, { key: "Escape" });

    expect(update).not.toHaveBeenCalled();
    expect(intervalBox()).toBeNull();
    fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
    expect(intervalBox()).toHaveProperty("value", "30");
  });

  it("keeps what you are typing when a poll lands underneath", async () => {
    await mount();
    fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
    fireEvent.change(intervalBox()!, { target: { value: "45" } });

    await poll(status({ jobs: [{ ...status().jobs[0]!, interval_minutes: 30, running: true }] }));

    expect(intervalBox()).toHaveProperty("value", "45");
  });

  it("follows the server while the editor is closed", async () => {
    await mount();
    await poll(status({ jobs: [{ ...status().jobs[0]!, interval_minutes: 90 }] }));
    await waitFor(() =>
      expect(screen.getByRole("button", { name: /scheduler.everyMin/ })).toBeTruthy(),
    );

    fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
    expect(intervalBox()).toHaveProperty("value", "90");
  });

  it("refuses a value outside the range instead of silently dropping it", async () => {
    const update = vi.spyOn(api, "updateSchedulerJob").mockResolvedValue(undefined as never);
    await mount();

    fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
    fireEvent.change(intervalBox()!, { target: { value: "99999" } });
    fireEvent.keyDown(intervalBox()!, { key: "Enter" });

    expect(update).not.toHaveBeenCalled();
    // Still open, still showing what was typed, and saying why.
    expect(intervalBox()).toHaveProperty("value", "99999");
    expect(intervalBox()!.getAttribute("aria-invalid")).toBe("true");
    expect(screen.getByRole("alert").textContent).toBe("scheduler.range");
  });

  it("hands focus back to the trigger when the editor closes", async () => {
    await mount();
    const trigger = screen.getByRole("button", { name: /scheduler.everyMin/ });
    fireEvent.click(trigger);
    expect(document.activeElement).toBe(intervalBox());

    fireEvent.keyDown(intervalBox()!, { key: "Escape" });
    await waitFor(() =>
      expect(document.activeElement).toBe(
        screen.getByRole("button", { name: /scheduler.everyMin/ }),
      ),
    );
  });

  // A real Enter re-opened the editor — the keystroke's own activation landed on the trigger
  // the focus had just returned to. The closing keys cancel their default action.
  it("closing by a key does not press the trigger again", async () => {
    await mount();
    for (const key of ["Enter", "Escape"]) {
      fireEvent.click(screen.getByRole("button", { name: /scheduler.everyMin/ }));
      expect(fireEvent.keyDown(intervalBox()!, { key })).toBe(false);
    }
  });
});

describe("Scheduler · the maintenance batch editor", () => {
  it("keeps what you are typing when a poll changes the batch underneath", async () => {
    // THE regression this editor needed: its old effect re-synced on every
    // `revalidate_batch` change with no editing guard, so a poll landing mid-keystroke replaced
    // what the admin had typed.
    await mount();
    fireEvent.change(batchBox(), { target: { value: "9000" } });

    // The poll carries a new interval TOO, and the interval label follows the server unconditionally
    // — so waiting for it is how this test knows the new status has actually been rendered. Without
    // that anchor the assertion below passes on a page that simply has not polled yet.
    await poll(
      status({
        jobs: [{ ...status().jobs[0]!, interval_minutes: 90 }],
        maintenance: { ...status().maintenance, revalidate_batch: 12000 },
      }),
    );
    await waitFor(() =>
      expect(screen.getByRole("button", { name: /scheduler.everyMin/ })).toBeTruthy(),
    );

    expect(batchBox()).toHaveProperty("value", "9000");
  });

  it("refuses a value outside min..max instead of silently dropping it", async () => {
    const save = vi.spyOn(api, "updateMaintenanceBatch").mockResolvedValue({
      revalidate_batch: 5000,
    });
    await mount();

    fireEvent.change(batchBox(), { target: { value: "10" } }); // below m.min = 1000
    fireEvent.keyDown(batchBox(), { key: "Enter" });

    expect(save).not.toHaveBeenCalled();
    expect(batchBox()).toHaveProperty("value", "10");
    expect(batchBox().getAttribute("aria-invalid")).toBe("true");
    expect(screen.getByRole("alert").textContent).toBe("scheduler.range");
    expect(screen.getByRole("button", { name: "common.save" })).toHaveProperty("disabled", true);
  });

  it("is not dirty until edited, and stops being dirty once saved", async () => {
    const save = vi
      .spyOn(api, "updateMaintenanceBatch")
      .mockResolvedValue({ revalidate_batch: 9000 });
    await mount();
    const saveBtn = () => screen.getByRole("button", { name: "common.save" });

    expect(saveBtn()).toHaveProperty("disabled", true);
    fireEvent.change(batchBox(), { target: { value: "9000" } });
    expect(saveBtn()).toHaveProperty("disabled", false);

    fireEvent.keyDown(batchBox(), { key: "Enter" });
    expect(saveBtn()).toHaveProperty("disabled", true); // the draft is dropped at once
    await waitFor(() => expect(save).toHaveBeenCalledWith(9000));
  });

  it("follows a poll that changes the batch while nothing is being typed", async () => {
    await mount();
    expect(batchBox()).toHaveProperty("value", "5000");
    await poll(status({ maintenance: { ...status().maintenance, revalidate_batch: 12000 } }));
    await waitFor(() => expect(batchBox()).toHaveProperty("value", "12000"));
  });
});

describe("Scheduler while paused", () => {
  // Unavailable WITH a reason ("resume first"): the runs stay in the tab order, so a keyboard user
  // reaches the hint, and they are inert. Natively disabled, the reason was mouse-only.
  it("keeps Run all and a job's Run focusable and inert", async () => {
    const runAll = vi.spyOn(api, "runAllSchedulerJobs").mockResolvedValue({ started: [] });
    const runOne = vi.spyOn(api, "runSchedulerJob").mockResolvedValue({ started: true } as never);
    await mount(status({ paused: true }));
    for (const name of ["scheduler.runAll", "scheduler.runNow"]) {
      const btn = screen.getByRole("button", { name });
      expect(btn.hasAttribute("disabled")).toBe(false);
      expect(btn.getAttribute("aria-disabled")).toBe("true");
      fireEvent.click(btn);
    }
    expect(runAll).not.toHaveBeenCalled();
    expect(runOne).not.toHaveBeenCalled();
  });
});

describe("a job's last result", () => {
  it("is named from its data, not the server's English one-liner", async () => {
    const base = status();
    await mount({
      ...base,
      jobs: [
        {
          ...base.jobs[0]!,
          last_finished: new Date().toISOString(),
          last_result: "new=3, failed=0",
          result: { new: 3, failed: 0 },
        },
      ],
    });
    // Key-echo i18n: the keys named, the counts shown.
    expect(
      await screen.findByText(/scheduler\.result\.new: 3 · scheduler\.result\.failed: 0/),
    ).toBeTruthy();
    expect(screen.queryByText(/new=3/)).toBeNull();
  });
});

describe("a row's run history", () => {
  const at = (minutesAgo: number) => new Date(Date.now() - minutesAgo * 60_000).toISOString();
  const run = (id: number, status: RunBrief["status"], minutesAgo: number): RunBrief => ({
    id,
    status,
    trigger: "scheduled",
    started_at: at(minutesAgo),
    finished_at: status === "running" ? null : at(minutesAgo),
  });
  const dots = (root: HTMLElement = document.body) =>
    within(root)
      .getAllByRole("img")
      .map((d) => d.getAttribute("data-dot"));

  // An interrupted run fell through to "idle" — a grey dot that said no run was ever recorded.
  it("shows the last runs newest first, an interrupted one as such", async () => {
    const base = status();
    await mount({
      ...base,
      jobs: [
        {
          ...base.jobs[0]!,
          status: "interrupted",
          last_finished: at(2),
          recent: [run(3, "interrupted", 2), run(2, "error", 12), run(1, "ok", 22)],
        },
      ],
    });
    expect(dots()).toEqual(["interrupted", "error", "ok"]);
    expect(screen.getByText(/scheduler\.interrupted/)).toBeTruthy();
    expect(screen.getByText("scheduler.dot.interrupted")).toBeTruthy(); // the legend names it
  });

  it("shows one idle dot for a job that never ran", async () => {
    await mount();
    expect(dots()).toEqual(["idle"]);
  });

  it("gives a run the job has claimed, but not yet recorded, the newest dot", async () => {
    const base = status();
    await mount({
      ...base,
      jobs: [
        {
          ...base.jobs[0]!,
          running: true,
          recent: [run(3, "ok", 10), run(2, "ok", 20), run(1, "error", 30)],
        },
      ],
    });
    expect(dots()).toEqual(["running", "ok", "ok"]);
  });

  // The one-channel full-history backfill ran unseen: a background task only the log heard of.
  it("lists a user's ad-hoc run beside the jobs, with its channel and no run button", async () => {
    const base = status();
    const adHoc: SchedulerAdHoc = {
      ...base.jobs[0]!,
      id: "channel_backfill",
      running: false,
      target: "UC_bbc",
      target_title: "BBC Earth",
      last_finished: at(60),
      result: { videos_added: 69 },
      recent: [run(9, "ok", 60), run(8, "ok", 120)],
    };
    await mount({ ...base, ad_hoc: [adHoc] });
    expect(screen.getByText("scheduler.adHocTitle")).toBeTruthy();
    const row = screen.getByText("scheduler.jobs.channel_backfill").closest<HTMLElement>(".p-3")!;
    expect(dots(row)).toEqual(["ok", "ok"]);
    expect(within(row).getByText(/BBC Earth/)).toBeTruthy();
    expect(within(row).getByText(/scheduler\.result\.videos_added: 69/)).toBeTruthy();
    expect(within(row).getByText("scheduler.adHocStarted")).toBeTruthy();
    expect(within(row).queryByRole("button", { name: "scheduler.runNow" })).toBeNull();
  });
});

describe("a row's history", () => {
  // The dots show three runs; the rest is the activity page's run list, narrowed to the row's job.
  it("opens the activity page's runs of that job", async () => {
    const setPage = vi.fn((_page: string, then?: () => void) => then?.());
    window.history.replaceState(null, "", "/?page=scheduler");
    current = status();
    qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
    render(
      <NavigationActionsContext.Provider
        value={{
          setPage,
          openChannel: () => {},
          closeChannel: () => {},
          enterYtSearch: () => {},
          exitYtSearch: () => {},
        }}
      >
        <QueryClientProvider client={qc}>
          <Scheduler />
        </QueryClientProvider>
      </NavigationActionsContext.Provider>,
    );
    await screen.findByText("scheduler.maintenance.batchLabel");
    const job = current.jobs[0]!.id;
    const row = screen.getByText(`scheduler.jobs.${job}`).closest<HTMLElement>(".p-3")!;

    fireEvent.click(within(row).getByRole("button", { name: "scheduler.history" }));

    expect(setPage).toHaveBeenCalledWith("activity", expect.any(Function));
    const url = new URLSearchParams(window.location.search);
    expect([url.get("page"), url.get("rjob")]).toEqual(["activity", job]);
  });
});