// @vitest-environment happy-dom
(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;

import { afterEach, describe, expect, it, vi } from "vitest";
import { cleanup, fireEvent, render, screen } from "@testing-library/react";
import { ActivityFeed } from "./ActivityFeed";
import type { Activity } from "@/types";

// happy-dom keeps `document.body` between tests; without cleanup,
// `screen.getByRole("button")` finds buttons from earlier renders.
afterEach(() => cleanup());

const baseActivity: Activity = {
  id: "a-1",
  kind: "claim_submitted",
  message: "Claim ABC-1 submitted",
  timestamp: "2026-06-20T12:00:00Z",
};

describe("ActivityFeed", () => {
  it("renders the empty-state copy when items is empty", () => {
    render(<ActivityFeed items={[]} />);
    expect(screen.getByText("No activity yet.")).toBeTruthy();
  });

  it("renders each item's message", () => {
    render(
      <ActivityFeed
        items={[
          baseActivity,
          { ...baseActivity, id: "a-2", message: "Remit XYZ received" },
        ]}
      />,
    );
    expect(screen.getByText("Claim ABC-1 submitted")).toBeTruthy();
    expect(screen.getByText("Remit XYZ received")).toBeTruthy();
  });

  it("does not crash on an unknown kind", () => {
    // Backwards-compat guard: the backend may emit a kind the frontend
    // hasn't been updated for yet (manual_match was the original case).
    // The feed must fall back to a neutral icon instead of throwing.
    const unknown = {
      ...baseActivity,
      id: "a-3",
      message: "future_kind event arrived",
      // Cast through `unknown` so the type-checker doesn't widen the
      // `kind` literal away from the exhaustive union.
      kind: "future_kind" as Activity["kind"],
    };
    expect(() => render(<ActivityFeed items={[unknown]} />)).not.toThrow();
    expect(screen.getByText("future_kind event arrived")).toBeTruthy();
  });

  // -------------------------------------------------------------------
  // SP21 Task 2.5: optional `onItemClick` prop makes each row a
  // drillable target. Default behavior (no handler) must stay unchanged.
  // -------------------------------------------------------------------

  it("does not attach row-level click attrs when onItemClick is omitted", () => {
    render(<ActivityFeed items={[baseActivity]} />);
    const li = screen.getByRole("listitem");
    expect(li.getAttribute("role")).not.toBe("button");
    expect(li.getAttribute("tabindex")).toBeNull();
    expect(li.classList.contains("drillable")).toBe(false);
  });

  it("attaches role/tabIndex/drillable class when onItemClick is provided", () => {
    render(
      <ActivityFeed
        items={[baseActivity]}
        onItemClick={() => {}}
      />,
    );
    const li = screen.getByRole("button", { name: /View claim submitted/ });
    expect(li.tagName).toBe("LI");
    expect(li.getAttribute("tabindex")).toBe("0");
    expect(li.classList.contains("drillable")).toBe(true);
  });

  it("calls onItemClick with the event on click", () => {
    const onItemClick = vi.fn();
    render(
      <ActivityFeed
        items={[baseActivity]}
        onItemClick={onItemClick}
      />,
    );
    const li = screen.getByRole("button");
    fireEvent.click(li);
    expect(onItemClick).toHaveBeenCalledTimes(1);
    expect(onItemClick).toHaveBeenCalledWith(baseActivity);
  });

  it("calls onItemClick on Enter keydown", () => {
    const onItemClick = vi.fn();
    render(
      <ActivityFeed
        items={[baseActivity]}
        onItemClick={onItemClick}
      />,
    );
    const li = screen.getByRole("button");
    fireEvent.keyDown(li, { key: "Enter" });
    expect(onItemClick).toHaveBeenCalledTimes(1);
    expect(onItemClick).toHaveBeenCalledWith(baseActivity);
  });

  it("calls onItemClick on Space keydown", () => {
    const onItemClick = vi.fn();
    render(
      <ActivityFeed
        items={[baseActivity]}
        onItemClick={onItemClick}
      />,
    );
    fireEvent.keyDown(screen.getByRole("button"), { key: " " });
    expect(onItemClick).toHaveBeenCalledTimes(1);
  });

  it("does not call onItemClick for unrelated keys", () => {
    const onItemClick = vi.fn();
    render(
      <ActivityFeed
        items={[baseActivity]}
        onItemClick={onItemClick}
      />,
    );
    fireEvent.keyDown(screen.getByRole("button"), { key: "a" });
    expect(onItemClick).not.toHaveBeenCalled();
  });

  // Regression for the Task 2.4 event-bubbling pattern: clicks on a
  // drillable row must not bubble to a parent row click. Without
  // stopPropagation a Dashboard parent handler could fire alongside
  // the row click and corrupt history.
  it("stops click propagation so a parent row handler does not also fire", () => {
    const onItemClick = vi.fn();
    const parentClick = vi.fn();
    render(
      <ul onClick={parentClick}>
        <ActivityFeed items={[baseActivity]} onItemClick={onItemClick} />
      </ul>,
    );
    fireEvent.click(screen.getByRole("button"));
    expect(onItemClick).toHaveBeenCalledTimes(1);
    expect(parentClick).not.toHaveBeenCalled();
  });
});