// @vitest-environment jsdom
//
// Contract of the jump-to palette: filtering (word-wise and accent-insensitive), arrow/Enter
// selection over the FLAT result list, and closing before the command runs. Items are plain props
// (no i18n, no domain), so this asserts the shell only. i18n is key-passthrough.
import { useState } from "react";
import { describe, it, expect, vi, afterEach, beforeAll } from "vitest";
import { render, screen, fireEvent, cleanup } from "@testing-library/react";
import CommandPalette, { type CommandGroup } from "./CommandPalette";

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

beforeAll(() => {
  // jsdom has no layout, so scrollIntoView is missing on the elements the active-row effect touches.
  Element.prototype.scrollIntoView ??= () => {};
});

afterEach(cleanup);

// `choose` closes and waits for the dialog's own Back-to-close history entry to be reclaimed before
// running the command (see closeThenNavigate), so the command lands a tick later — hence the waits.
const ran: string[] = [];
const groups = (): CommandGroup[] => [
  {
    id: "modules",
    label: "Modules",
    items: [
      { id: "page:feed", label: "Feed", run: () => ran.push("page:feed") },
      { id: "page:plex", label: "Plex", keywords: "media library", run: () => ran.push("plex") },
    ],
  },
  {
    id: "channels",
    label: "Channels",
    items: [
      { id: "ch:1", label: "TheVR Podcast", hint: "@thevr", run: () => ran.push("ch:1") },
      { id: "ch:2", label: "Pénzügyi Fitnesz", run: () => ran.push("ch:2") },
    ],
  },
];

// The palette must REALLY close, not just report it: `choose` waits for the Back-to-close entry
// that only a genuine unmount reclaims, so a harness that keeps it mounted would never run anything.
function Harness() {
  const [isOpen, setIsOpen] = useState(true);
  return (
    <CommandPalette
      open={isOpen}
      onClose={() => {
        ran.push("closed");
        setIsOpen(false);
      }}
      groups={groups()}
    />
  );
}

const open = () => {
  ran.length = 0;
  return render(<Harness />);
};

const rows = () =>
  [...document.querySelectorAll("[data-cmd-id]")].map((el) => el.getAttribute("data-cmd-id"));

/** The virtually-selected row, read the way a screen reader would. */
const selected = () =>
  document.querySelector("[aria-selected='true']")?.getAttribute("data-cmd-id") ?? null;

const field = () => screen.getByRole("combobox", { name: "palette.placeholder" });
const type = (value: string) => fireEvent.change(field(), { target: { value } });
const press = (key: string) => fireEvent.keyDown(field(), { key });

describe("CommandPalette", () => {
  it("renders nothing while closed", () => {
    render(<CommandPalette open={false} onClose={() => {}} groups={groups()} />);
    expect(screen.queryByText("palette.title")).toBeNull();
  });

  it("lists every group until you type", () => {
    open();
    expect(rows()).toEqual(["page:feed", "page:plex", "ch:1", "ch:2"]);
  });

  // You half-remember a name; you should not have to remember the word order or the spacing.
  it("matches on each word, in any order", () => {
    open();
    type("pod thevr");
    expect(rows()).toEqual(["ch:1"]);
  });

  // Bilingual app, hurried typing: nobody reaches for the accent keys.
  it("matches without accents", () => {
    open();
    type("penzugyi");
    expect(rows()).toEqual(["ch:2"]);
  });

  it("matches hidden keywords and the group name", () => {
    open();
    type("media");
    expect(rows()).toEqual(["page:plex"]);
    type("channels");
    expect(rows()).toEqual(["ch:1", "ch:2"]);
  });

  it("says so when nothing matches", () => {
    open();
    type("zzzz");
    expect(rows()).toEqual([]);
    expect(screen.getByText("palette.empty")).toBeTruthy();
  });

  it("selects the first row and points the input at it", () => {
    open();
    expect(selected()).toBe("page:feed");
    expect(
      screen
        .getByRole("combobox", { name: "palette.placeholder" })
        .getAttribute("aria-activedescendant"),
    ).toContain("page:feed");
  });

  // The arrows walk the flat result list, not the sections — crossing a group heading is invisible.
  it("walks results with the arrows, across group boundaries", () => {
    open();
    press("ArrowDown");
    press("ArrowDown");
    expect(selected()).toBe("ch:1");
  });

  it("wraps in both directions", () => {
    open();
    press("ArrowUp");
    expect(selected()).toBe("ch:2");
    press("ArrowDown");
    expect(selected()).toBe("page:feed");
  });

  it("keeps the selection valid when the filter shrinks the list", () => {
    open();
    press("ArrowDown");
    press("ArrowDown");
    press("ArrowDown"); // ch:2
    type("thevr"); // one row left; the old index is out of range
    expect(selected()).toBe("ch:1");
  });

  // No test in THIS file goes through the full close→reclaim→run cycle: jsdom gives a file one
  // session history and history.ts's overlay bookkeeping is module-global, so the cycle only holds
  // in isolation — it lives in CommandPalette.ordering.dom.test.tsx. Which command Enter picks is
  // covered by the selection assertions above; this checks it chooses at all.
  it("chooses the selected row on Enter", () => {
    open();
    press("ArrowDown");
    press("Enter");
    expect(ran).toEqual(["closed"]);
  });
});