import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
import { act, renderHook } from "@testing-library/react";
import { useFading } from "../../../hooks/feed/useFading.ts";

afterEach(() => vi.useRealTimers());

describe("useFading", () => {
  beforeEach(() => vi.useFakeTimers());

  test("cooldown for 2s, then dismissing for 350ms, then gone", () => {
    const { result } = renderHook(useFading);
    act(() => result.current.startFading("a"));
    expect(result.current.fading).toEqual({ a: "cooldown" });
    act(() => vi.advanceTimersByTime(2000));
    expect(result.current.fading).toEqual({ a: "dismissing" });
    act(() => vi.advanceTimersByTime(350));
    expect(result.current.fading).toEqual({});
  });

  test("starting twice is one animation", () => {
    const { result } = renderHook(useFading);
    act(() => result.current.startFading("a"));
    act(() => vi.advanceTimersByTime(1000));
    act(() => result.current.startFading("a"));
    act(() => vi.advanceTimersByTime(1000));
    expect(result.current.fading).toEqual({ a: "dismissing" });
  });

  test("cancel during cooldown and during dismissal", () => {
    const { result } = renderHook(useFading);
    act(() => result.current.startFading("a"));
    act(() => result.current.cancelFading("a"));
    expect(result.current.fading).toEqual({});
    act(() => vi.advanceTimersByTime(5000));
    expect(result.current.fading).toEqual({});

    act(() => result.current.startFading("b"));
    act(() => vi.advanceTimersByTime(2100));
    act(() => result.current.cancelFading("b"));
    expect(result.current.fading).toEqual({});
    // Cancelled means it can start over.
    act(() => result.current.startFading("b"));
    expect(result.current.fading).toEqual({ b: "cooldown" });
  });

  test("cancelAll", () => {
    const { result } = renderHook(useFading);
    act(() => {
      result.current.startFading("a");
      result.current.startFading("b");
    });
    act(() => result.current.cancelAll());
    expect(result.current.fading).toEqual({});
  });

  test("onFaded hears of a fade that ended, not of a cancelled one", () => {
    const onFaded = vi.fn();
    const { result } = renderHook(() => useFading(onFaded));
    act(() => {
      result.current.startFading("a");
      result.current.startFading("b");
    });
    act(() => vi.advanceTimersByTime(2100));
    act(() => result.current.cancelFading("b"));
    act(() => vi.advanceTimersByTime(250));
    expect(onFaded.mock.calls).toEqual([["a"]]);
  });
});