import { act, render, waitFor } from "@testing-library/react";
import createGlobe from "cobe";
import { ControlRoomGlobe } from "./ControlRoomGlobe";

const mockDestroy = jest.fn();

jest.mock("cobe", () => ({
  __esModule: true,
  default: jest.fn(() => ({ destroy: mockDestroy })),
}));

jest.mock("motion/react", () => ({
  useMotionValue: (initial: number) => ({
    get: () => initial,
    set: jest.fn(),
  }),
  useSpring: (value: unknown) => value,
}));

let intersectionCallback: IntersectionObserverCallback | undefined;
let resizeCallback: ResizeObserverCallback | undefined;
let measuredWidth = 400;

function setDocumentHidden(hidden: boolean) {
  Object.defineProperty(document, "hidden", {
    configurable: true,
    value: hidden,
  });
}

function setGlobeIntersects(isIntersecting: boolean) {
  const entry = { isIntersecting } as IntersectionObserverEntry;
  act(() => intersectionCallback?.([entry], {} as IntersectionObserver));
}

function renderCallback() {
  expect(createGlobe).toHaveBeenCalledTimes(1);
  const call = jest.mocked(createGlobe).mock.calls[0];
  if (!call) throw new Error("Globe was not initialized");
  return call[1].onRender;
}

describe("ControlRoomGlobe lifecycle", () => {
  beforeEach(() => {
    jest.clearAllMocks();
    setDocumentHidden(false);
    intersectionCallback = undefined;
    resizeCallback = undefined;
    measuredWidth = 400;
    jest
      .spyOn(HTMLElement.prototype, "offsetWidth", "get")
      .mockImplementation(() => measuredWidth);
    jest
      .spyOn(HTMLCanvasElement.prototype, "getContext")
      .mockReturnValue({} as unknown as GPUCanvasContext);

    class MockIntersectionObserver {
      readonly root = null;
      readonly rootMargin = "";
      readonly thresholds = [];

      constructor(callback: IntersectionObserverCallback) {
        intersectionCallback = callback;
      }

      disconnect = jest.fn();
      observe = jest.fn();
      takeRecords = () => [];
      unobserve = jest.fn();
    }
    global.IntersectionObserver =
      MockIntersectionObserver as unknown as typeof IntersectionObserver;

    class MockResizeObserver {
      constructor(callback: ResizeObserverCallback) {
        resizeCallback = callback;
      }

      disconnect = jest.fn();
      observe = jest.fn();
      unobserve = jest.fn();
    }
    global.ResizeObserver =
      MockResizeObserver as unknown as typeof ResizeObserver;
  });

  afterEach(() => {
    jest.restoreAllMocks();
  });

  it("pauses for a hidden tab without losing the intersection flag", async () => {
    render(<ControlRoomGlobe />);
    await waitFor(() => expect(createGlobe).toHaveBeenCalledTimes(1));
    const renderFrame = renderCallback();
    const state = { phi: 0, theta: 0, width: 0, height: 0 };

    setGlobeIntersects(true);
    renderFrame(state);
    expect(state.phi).not.toBe(0);

    setDocumentHidden(true);
    const pausedPhi = state.phi;
    renderFrame(state);
    expect(state.phi).toBe(pausedPhi);

    setDocumentHidden(false);
    renderFrame(state);
    expect(state.phi).not.toBe(pausedPhi);

    setGlobeIntersects(false);
    const offscreenPhi = state.phi;
    setDocumentHidden(true);
    setDocumentHidden(false);
    renderFrame(state);
    expect(state.phi).toBe(offscreenPhi);
  });

  it("keeps one Cobe instance while ResizeObserver updates render dimensions", async () => {
    render(<ControlRoomGlobe />);
    await waitFor(() => expect(createGlobe).toHaveBeenCalledTimes(1));

    measuredWidth = 520;
    const entry = {
      contentRect: { width: measuredWidth },
    } as ResizeObserverEntry;
    act(() => resizeCallback?.([entry], {} as ResizeObserver));
    setGlobeIntersects(true);
    const state = { phi: 0, theta: 0, width: 0, height: 0 };
    renderCallback()(state);

    expect(createGlobe).toHaveBeenCalledTimes(1);
    expect(state.width).toBe(1040);
    expect(state.height).toBe(1040);
  });

  it("keeps the reduced-motion globe static while tracking dimensions", async () => {
    render(<ControlRoomGlobe autoRotate={false} />);
    await waitFor(() => expect(createGlobe).toHaveBeenCalled());
    setGlobeIntersects(true);
    const state = { phi: 0, theta: 0, width: 0, height: 0 };

    renderCallback()(state);

    expect(state).toEqual({ phi: 0, theta: 0, width: 800, height: 800 });
  });
});