import { act, render, screen } from "@testing-library/react";
import HeroField, { DIVE_QUERY } from "./HeroField";

type SceneProps = {
  visible: boolean;
  progressRef: { current: number };
  labelsRef?: unknown;
  onReady: () => void;
  onError: () => void;
};
const mockScenes: SceneProps[] = [];
const mockPrepare = jest.fn();

jest.mock("./HeroFieldScene", () => ({
  __esModule: true,
  default: function MockScene(props: SceneProps) {
    mockScenes.push(props);
    return require("react").createElement("canvas", {
      "data-testid": "scene",
    });
  },
  prepareField: () => mockPrepare(),
}));

const original = {
  matchMedia: window.matchMedia,
  webgl2: (window as unknown as Record<string, unknown>).WebGL2RenderingContext,
  getContext: HTMLCanvasElement.prototype.getContext,
};

/** Consultas de mídia que valem; o mergulho (DIVE_QUERY) vale por padrão: tela alta, sem movimento reduzido. */
function mockMedia(active: string[] = [DIVE_QUERY]) {
  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
    matches: active.includes(query),
    media: query,
    addEventListener() {},
    removeEventListener() {},
  }));
}

function mockNavigator(values: Record<string, unknown>) {
  for (const [key, value] of Object.entries(values))
    Object.defineProperty(navigator, key, { configurable: true, value });
}

function Hero() {
  return (
    <section className="hero">
      <HeroField />
    </section>
  );
}

const section = () => document.querySelector(".hero") as HTMLElement;

/** Rola o hero no meio do mergulho e diz se a rolagem chegou a escrever o progresso no CSS. */
function scrollWritesProgress() {
  section().getBoundingClientRect = () =>
    ({ top: -700, height: 2760, bottom: 2300 }) as DOMRect;
  act(() => {
    window.dispatchEvent(new Event("scroll"));
    jest.advanceTimersByTime(40);
  });
  return section().style.getPropertyValue("--hero-p") !== "";
}

/** Avança o relógio e deixa as promessas (importação do pacote, passos ociosos) resolverem no caminho. */
const advance = (ms: number) =>
  act(async () => {
    await jest.advanceTimersByTimeAsync(ms);
  });

/** A página fica ociosa (sem requestIdleCallback: 1,2 s) e o Three.js entra, passo a passo. */
async function idle() {
  await advance(1200); // a espera
  await advance(60); // pacote carregado, geometria no próximo intervalo ocioso
  await advance(60); // Canvas montado
}

beforeEach(() => {
  jest.useFakeTimers();
  mockScenes.length = 0;
  mockPrepare.mockClear();
  mockMedia();
  mockNavigator({
    hardwareConcurrency: 8,
    deviceMemory: undefined,
    connection: undefined,
  });
  (window as unknown as Record<string, unknown>).WebGL2RenderingContext =
    function WebGL2RenderingContext() {};
  HTMLCanvasElement.prototype.getContext = (() => ({
    getExtension: () => null,
  })) as unknown as typeof HTMLCanvasElement.prototype.getContext;
});

afterEach(() => {
  jest.useRealTimers();
  window.matchMedia = original.matchMedia;
  (window as unknown as Record<string, unknown>).WebGL2RenderingContext =
    original.webgl2;
  HTMLCanvasElement.prototype.getContext = original.getContext;
});

describe("HeroField (ambient background)", () => {
  it("mounts the WebGL scene only after the page is idle, on a capable desktop", async () => {
    render(<Hero />);
    expect(screen.queryByTestId("scene")).toBeNull();

    await idle();

    expect(screen.getByTestId("scene")).toBeInTheDocument();
    // o IntersectionObserver do jest.setup avisa que o hero está à vista: o desenho está liberado
    expect(mockScenes.at(-1)?.visible).toBe(true);
  });

  it("brings the geometry in before the Canvas, in a task of its own", async () => {
    render(<Hero />);

    await advance(1200);
    await advance(10); // o pacote carregou, mas o intervalo ocioso da geometria ainda não veio
    expect(mockPrepare).not.toHaveBeenCalled();
    expect(screen.queryByTestId("scene")).toBeNull();

    await advance(60);
    expect(mockPrepare).toHaveBeenCalledTimes(1);
    expect(screen.queryByTestId("scene")).toBeNull();

    await advance(60);
    expect(screen.getByTestId("scene")).toBeInTheDocument();
    expect(mockPrepare).toHaveBeenCalledTimes(1);
  });

  it("does not wait for the idle time once the visitor interacts", async () => {
    render(<Hero />);
    await advance(100);
    expect(screen.queryByTestId("scene")).toBeNull();

    act(() => {
      window.dispatchEvent(new Event("pointermove"));
    });
    await advance(200);

    expect(screen.getByTestId("scene")).toBeInTheDocument();
  });

  it("is decorative: hidden from assistive technology and with no labels over the 3D", async () => {
    const { container } = render(<Hero />);
    await idle();
    const field = container.querySelector(".hero-field");
    expect(field).toHaveAttribute("aria-hidden", "true");
    expect(container.querySelector(".hero-tag")).toBeNull();
    for (const label of ["A tela", "As integrações", "Os dados"])
      expect(screen.queryByText(label, { exact: false })).toBeNull();
    expect(mockScenes.at(-1)?.labelsRef).toBeUndefined();
  });

  it.each([
    ["a touch pointer", () => mockMedia([DIVE_QUERY, "(pointer: coarse)"])],
    ["reduced motion", () => mockMedia(["(prefers-reduced-motion: reduce)"])],
    ["the data saver", () => mockNavigator({ connection: { saveData: true } })],
    ["four cores", () => mockNavigator({ hardwareConcurrency: 4 })],
    ["4 GB of memory", () => mockNavigator({ deviceMemory: 4 })],
    [
      "no WebGL2",
      () => {
        (window as unknown as Record<string, unknown>).WebGL2RenderingContext =
          undefined;
      },
    ],
  ])(
    "keeps the light static background (no WebGL, no dive, no scroll work) with %s",
    async (_label, arrange) => {
      arrange();
      const { container } = render(<Hero />);

      await idle();

      expect(screen.queryByTestId("scene")).toBeNull();
      expect(mockScenes).toHaveLength(0);
      expect(container.querySelector(".hero-field")).not.toHaveAttribute(
        "data-ready",
      );
      // o hero é o palco de 100svh: sem marca de mergulho, sem variável de rolagem
      expect(section()).not.toHaveAttribute("data-dive");
      expect(scrollWritesProgress()).toBe(false);
    },
  );

  it("marks the hero for the dive (the CSS then gives it its scroll block) and follows the hero scroll with --hero-p and --hero-open", async () => {
    const { container } = render(<Hero />);
    const hero = container.querySelector(".hero") as HTMLElement;
    expect(hero).toHaveAttribute("data-dive");
    await idle();
    // 2760 px de hero (altura = 1,7 tela de cauda + o mergulho): 800 de palco, 560 de Projetos subindo e 1400 de mergulho
    let top = 0;
    hero.getBoundingClientRect = () =>
      ({ top, height: 2760, bottom: top + 2760 }) as DOMRect;
    Object.defineProperty(window, "innerHeight", {
      configurable: true,
      value: 800,
    });
    const scroll = (to: number) => {
      top = -to;
      act(() => {
        window.dispatchEvent(new Event("scroll"));
        jest.advanceTimersByTime(40);
      });
    };

    scroll(0);
    expect(mockScenes.at(-1)?.progressRef.current).toBe(0);

    scroll(700); // meio do mergulho (1400 px de trilho)
    expect(Number(hero.style.getPropertyValue("--hero-p"))).toBeCloseTo(0.5);
    // a máscara já se abriu por completo: o fundo aparece inteiro
    expect(Number(hero.style.getPropertyValue("--hero-open"))).toBe(1);

    scroll(1400);
    expect(Number(hero.style.getPropertyValue("--hero-p"))).toBe(1);
    expect(mockScenes.at(-1)?.visible).toBe(false);
  });

  it("does not start the dive on a short screen (the CSS does not apply there), but the ambient scene still runs", async () => {
    mockMedia([]);

    render(<Hero />);
    await idle();

    expect(section()).not.toHaveAttribute("data-dive");
    expect(scrollWritesProgress()).toBe(false);
    expect(screen.getByTestId("scene")).toBeInTheDocument();
  });

  it("reveals the scene (data-ready) once it has drawn its first frames, and goes back to the plain hero if it fails", async () => {
    const { container } = render(<Hero />);
    await idle();
    expect(container.querySelector(".hero-field")).not.toHaveAttribute(
      "data-ready",
    );

    act(() => mockScenes.at(-1)?.onReady());
    expect(container.querySelector(".hero-field")).toHaveAttribute(
      "data-ready",
    );

    act(() => mockScenes.at(-1)?.onError());
    expect(container.querySelector(".hero-field")).not.toHaveAttribute(
      "data-ready",
    );
    expect(screen.queryByTestId("scene")).toBeNull();
    // de volta ao palco de 100svh: sem marca de mergulho nem variáveis de rolagem
    expect(section()).not.toHaveAttribute("data-dive");
    expect(section().style.getPropertyValue("--hero-p")).toBe("");
  });
});