// @vitest-environment happy-dom
// Pure presentation component — no React Query, no async work — but we
// still set IS_REACT_ACT_ENVIRONMENT to match the project convention
// (ClaimDrawerHeader.test.tsx et al.).
(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;

import React, { act } from "react";
import { createRoot, type Root } from "react-dom/client";
import { describe, expect, it, vi } from "vitest";
import { KeyboardCheatsheet } from "./KeyboardCheatsheet";

/**
 * Render the component into a real DOM container. No QueryClientProvider
 * needed — the cheatsheet has no data dependencies.
 */
function renderIntoContainer(
  element: React.ReactElement
): { container: HTMLDivElement; unmount: () => void } {
  const container = document.createElement("div");
  document.body.appendChild(container);
  const root: Root = createRoot(container);
  act(() => {
    root.render(element);
  });
  return {
    container,
    unmount: () => {
      act(() => root.unmount());
      container.remove();
    },
  };
}

/**
 * Wait for a predicate over `document.body` to hold. Radix's Dialog
 * portals content into `document.body`, not into the React container,
 * so we query there. The component is sync-rendered in the happy
 * path (no async work), so a single tick of the microtask queue is
 * normally enough; we poll defensively.
 */
async function settle(
  predicate: (body: HTMLElement) => boolean,
  timeoutMs = 1000
): Promise<HTMLElement> {
  const body = document.body;
  const start = Date.now();
  while (!predicate(body)) {
    if (Date.now() - start > timeoutMs) {
      throw new Error(
        `settle: predicate did not hold within ${timeoutMs}ms (body=${body.innerHTML.slice(0, 200)})`
      );
    }
    await act(async () => {
      await new Promise((r) => setTimeout(r, 0));
    });
  }
  return body;
}

/**
 * Find the Radix overlay. Radix's DialogPortal places the overlay as
 * a direct sibling of the dialog content inside `document.body`, so
 * `previousElementSibling` reliably points at it across the
 * happy-dom test environment. The overlay element carries the
 * `data-state="open"` attribute and the `fixed inset-0 z-50`
 * positioning classes from the project's dialog primitive.
 */
function findOverlay(sheet: HTMLElement): HTMLElement | null {
  return sheet.previousElementSibling as HTMLElement | null;
}

describe("KeyboardCheatsheet", () => {
  it("test_does_not_render_when_closed", () => {
    // open=false → no DOM at all. The Dialog primitive respects `open`
    // and unmounts its portal when the root is closed.
    const onClose = vi.fn();
    const { container, unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={false} onClose={onClose} />
    );

    expect(
      container.querySelector('[data-testid="keyboard-cheatsheet"]')
    ).toBeNull();
    // Radix also portals to document.body; nothing there either.
    expect(
      document.body.querySelector('[data-testid="keyboard-cheatsheet"]')
    ).toBeNull();

    unmount();
  });

  it("test_renders_overlay_when_open", async () => {
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    // Radix portals to document.body — query there.
    const body = await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    const sheet = body.querySelector('[data-testid="keyboard-cheatsheet"]');
    expect(sheet).not.toBeNull();

    // All five shortcut rows must be present. The plan calls out five
    // shortcuts; we assert each by its key chip text.
    const text = (sheet?.textContent ?? "").toLowerCase();
    // j / k / ↑ / ↓ / esc / ? — at minimum these strings must appear.
    expect(text).toContain("j");
    expect(text).toContain("k");
    expect(text).toContain("↑");
    expect(text).toContain("↓");
    expect(text).toContain("esc");
    expect(text).toContain("?");

    unmount();
  });

  it("test_clicking_outside_dismisses", async () => {
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    const body = await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    const sheet = body.querySelector(
      '[data-testid="keyboard-cheatsheet"]'
    ) as HTMLElement | null;
    expect(sheet).not.toBeNull();

    // Radix's overlay click-to-dismiss uses React synthetic event
    // handlers (`onPointerDown` + `onClick`). In happy-dom these
    // attach on the first macrotask tick after the portal mounts —
    // a tick AFTER the testid lands in the DOM. Without this extra
    // wait, the pointerdown is dispatched before Radix's listener
    // is wired up and `onOpenChange(false)` never fires.
    await act(async () => {
      await new Promise((r) => setTimeout(r, 0));
    });

    const overlay = findOverlay(sheet!);
    expect(overlay).not.toBeNull();
    // Sanity: the overlay is NOT the content panel. Radix's dismiss
    // path (onPointerDown + onClick on the overlay element) requires
    // clicking outside the content area, so the overlay and content
    // must be distinct elements.
    expect(overlay).not.toBe(sheet);
    expect(overlay!.getAttribute("data-state")).toBe("open");

    // Radix's overlay dismiss is gated on a pointerdown event
    // (records whether the press started outside the content) followed
    // by a click on the overlay element. Dispatching both in order
    // triggers onOpenChange(false) → our onClose().
    expect(onClose).not.toHaveBeenCalled();
    act(() => {
      overlay!.dispatchEvent(
        new PointerEvent("pointerdown", {
          bubbles: true,
          cancelable: true,
          pointerType: "mouse",
        })
      );
      overlay!.click();
    });
    expect(onClose).toHaveBeenCalled();

    unmount();
  });

  it("test_pressing_any_other_key_dismisses", async () => {
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    // Dispatch a keydown for an arbitrary key — the component's
    // window-level listener should fire onClose.
    act(() => {
      window.dispatchEvent(
        new KeyboardEvent("keydown", { key: "a", bubbles: true })
      );
    });
    expect(onClose).toHaveBeenCalledTimes(1);

    unmount();
  });

  it("test_pressing_question_mark_does_not_dismiss_internally", async () => {
    // The toggle key (?) is the parent's responsibility — the cheatsheet
    // explicitly does NOT call onClose when ? is pressed while open.
    // The parent will set open=false before re-opening on the next
    // toggle. We verify the cheatsheet doesn't preempt the parent.
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    act(() => {
      window.dispatchEvent(
        new KeyboardEvent("keydown", { key: "?", bubbles: true })
      );
    });
    expect(onClose).not.toHaveBeenCalled();

    unmount();
  });

  it("test_lists_all_shortcuts_with_descriptions", async () => {
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    const body = await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    const sheet = body.querySelector(
      '[data-testid="keyboard-cheatsheet"]'
    ) as HTMLElement | null;
    const text = (sheet?.textContent ?? "").toLowerCase();

    // Each shortcut has a human-readable description. We don't pin
    // the exact wording (spec says "Next claim" / "Previous claim" /
    // "Close drawer" / "Toggle help"), but each row must include at
    // least one action descriptor word.
    // j → next
    expect(text).toMatch(/next/);
    // k → previous
    expect(text).toMatch(/previous/);
    // esc → close
    expect(text).toMatch(/close/);
    // ? → toggle help
    expect(text).toMatch(/help/);

    unmount();
  });

  it("test_uses_kbd_class_for_key_chips", async () => {
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    const body = await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    // The project defines a `.kbd` class in src/index.css; the
    // cheatsheet must use it for its key chips.
    const kbdChips = body.querySelectorAll(
      '[data-testid="keyboard-cheatsheet"] .kbd'
    );
    expect(kbdChips.length).toBeGreaterThan(0);

    unmount();
  });

  it("test_dialog_is_aria_labelledby_visible_heading", async () => {
    // The DialogContent must carry an aria-labelledby pointing at
    // the visible <h2> so screen readers announce "Keyboard, dialog"
    // instead of leaving the modal unlabeled (Radix logs a warning
    // otherwise). The id referenced must also resolve to a real
    // element with that id inside the cheatsheet.
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    const body = await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    const sheet = body.querySelector(
      '[data-testid="keyboard-cheatsheet"]'
    ) as HTMLElement | null;
    expect(sheet).not.toBeNull();

    // The Radix DialogContent exposes its labelledby on the panel
    // element itself. We accept either the dialog content id (which
    // is the data-testid) or its first role-bearing descendant —
    // depending on which element Radix attaches aria-labelledby to.
    const labelledBy =
      sheet?.getAttribute("aria-labelledby") ??
      sheet
        ?.querySelector("[aria-labelledby]")
        ?.getAttribute("aria-labelledby") ??
      null;
    expect(labelledBy).not.toBeNull();
    expect(labelledBy).toBe("keyboard-cheatsheet-title");

    // And the id must point at a real element whose text content is
    // the visible "Keyboard" heading — closing the loop between the
    // a11y wiring and the visible UI.
    const titleEl = body.querySelector("#keyboard-cheatsheet-title");
    expect(titleEl).not.toBeNull();
    expect(titleEl?.textContent).toBe("Keyboard");

    unmount();
  });

  it("test_close_button_has_specific_aria_label_and_describedby", async () => {
    // The cheatsheet renders an explicit close button (the shared
    // DialogContent X in the corner has a generic "Close dialog"
    // label that's out of scope here). The cheatsheet-specific one
    // must:
    //  - be findable by its cheatsheet-specific aria-label, and
    //  - carry aria-describedby pointing back at the visible heading
    //    so screen-reader users hear "Close keyboard cheatsheet,
    //    Keyboard, button".
    const onClose = vi.fn();
    const { unmount } = renderIntoContainer(
      <KeyboardCheatsheet open={true} onClose={onClose} />
    );

    const body = await settle((b) =>
      b.querySelector('[data-testid="keyboard-cheatsheet"]') !== null
    );

    const closeBtn = body.querySelector(
      '[aria-label="Close keyboard cheatsheet"]'
    ) as HTMLButtonElement | null;
    expect(closeBtn).not.toBeNull();

    // The describedby wires the close button back to the title so
    // the screen-reader announcement has context.
    expect(closeBtn?.getAttribute("aria-describedby")).toBe(
      "keyboard-cheatsheet-title"
    );

    // Clicking the close button must invoke the consumer's onClose.
    expect(onClose).not.toHaveBeenCalled();
    act(() => {
      closeBtn?.click();
    });
    expect(onClose).toHaveBeenCalledTimes(1);

    unmount();
  });
});