import { renderHook, act } from "@testing-library/react";

import { useEventEmitter } from "../use-event-emitter.hook";

describe("useEventEmitter [Base]", () => {
  test("should allow to emit data", () => {
    const eventHandler = jest.fn();
    const { result } = renderHook(() => useEventEmitter());

    act(() => {
      result.current.on(eventHandler);
      result.current.emit("data");
    });

    expect(eventHandler).toHaveBeenCalledTimes(1);
    expect(eventHandler).toHaveBeenCalledWith("data");
  });

  test("should allow to mount event '.on' listener", () => {
    const eventHandler = jest.fn();
    const { result } = renderHook(() => useEventEmitter());

    act(() => {
      result.current.on(eventHandler);
      result.current.emit("data");
    });

    expect(eventHandler).toHaveBeenCalledTimes(1);
  });

  test("should allow to receive emitted data", () => {
    const eventHandler = jest.fn();
    const { result } = renderHook(() => useEventEmitter());

    act(() => {
      result.current.on(eventHandler);
      result.current.emit("data");
    });

    expect(eventHandler).toHaveBeenCalledTimes(1);
    expect(eventHandler).toHaveBeenCalledWith("data");
  });

  test("should allow to unmount listener", () => {
    const eventHandler = jest.fn();
    const { result } = renderHook(() => useEventEmitter());

    act(() => {
      const off = result.current.on(eventHandler);
      off();
      result.current.emit("data");
      result.current.on(eventHandler);
      result.current.off(eventHandler);
      result.current.emit("data");
    });

    expect(eventHandler).toHaveBeenCalledTimes(0);
  });

  test("should allow to unmount all listeners", () => {
    const eventHandler = jest.fn();
    const { result } = renderHook(() => useEventEmitter<string>());

    act(() => {
      result.current.on(eventHandler);
      result.current.on(eventHandler);
      result.current.on(eventHandler);
      result.current.offAll();
      result.current.emit("data");
    });

    expect(eventHandler).toHaveBeenCalledTimes(0);
  });
});