import { act, fireEvent, render, screen } from "@testing-library/react";
import { useState } from "react";
import { getFeaturedProjects } from "@/lib/portfolio-data";
import {
  buildShowcaseItems,
  ShowcaseProvider,
  useShowcaseCard,
  useShowcaseItems,
  useShowcaseOpen,
} from "./ShowcaseProvider";

/**
 * Testes de caminhos-base de ShowcaseProvider (complemento de ShowcaseProvider.test.tsx): register() sem
 * IntersectionObserver, limiar de visibilidade, quem devolve o mouse, desmontagem do card em destaque, foco
 * que sai para dentro ou para fora do card, aba oculta, pausa do usuário e a janela ampliada.
 */

let reducedMotion = false;
jest.mock("@/app/hooks/useReducedMotion", () => ({
  useReducedMotion: () => reducedMotion,
}));
jest.mock("./ProjectLightbox", () => ({
  ProjectLightbox: ({
    index,
    items,
    onClose,
    onNavigate,
  }: {
    index: number;
    items: unknown[];
    onClose: () => void;
    onNavigate: (index: number) => void;
  }) => (
    <div role="dialog" aria-label="ampliado">
      aberto:{index} de {items.length}
      <button type="button" onClick={onClose}>
        fechar
      </button>
      <button type="button" onClick={() => onNavigate(0)}>
        ir para o primeiro
      </button>
      <button type="button" onClick={() => onNavigate(99)}>
        ir para um que não existe
      </button>
    </div>
  ),
}));

type FakeObserver = {
  callback: IntersectionObserverCallback;
  targets: Set<Element>;
};
let observers: FakeObserver[] = [];
const OriginalObserver = global.IntersectionObserver;

class FakeIntersectionObserver {
  private readonly state: FakeObserver;
  constructor(callback: IntersectionObserverCallback) {
    this.state = { callback, targets: new Set() };
    observers.push(this.state);
  }
  observe(element: Element) {
    this.state.targets.add(element);
  }
  unobserve(element: Element) {
    this.state.targets.delete(element);
  }
  disconnect() {
    this.state.targets.clear();
  }
  takeRecords() {
    return [];
  }
}

function report(target: Element, ratio: number) {
  act(() => {
    for (const observer of observers) {
      observer.callback(
        [
          {
            target,
            intersectionRatio: ratio,
            isIntersecting: ratio > 0,
          } as IntersectionObserverEntry,
        ],
        observer as unknown as IntersectionObserver,
      );
    }
  });
}

function place(element: Element, top: number) {
  element.getBoundingClientRect = () =>
    ({
      top,
      height: 300,
      bottom: top + 300,
      left: 0,
      right: 400,
      width: 400,
      x: 0,
      y: top,
    }) as DOMRect;
}

function flush() {
  act(() => {
    jest.advanceTimersByTime(40);
  });
}

function Card({ id }: { id: string }) {
  const { frameRef, active, open, toggleAutoplay, userPaused } =
    useShowcaseCard(id);
  return (
    <article className="ds-card">
      <div ref={frameRef} data-testid={id} data-active={active} />
      <button type="button" onClick={open}>
        ampliar {id}
      </button>
      <button type="button" onClick={toggleAutoplay}>
        pausa {id} {String(userPaused)}
      </button>
    </article>
  );
}

const projects = getFeaturedProjects(null);

function Cards({ ids }: { ids: string[] }) {
  return (
    <ShowcaseProvider projects={projects}>
      {ids.map((id) => (
        <Card key={id} id={id} />
      ))}
    </ShowcaseProvider>
  );
}

function setup(ids = ["sev-modaintima", "lavacao-047"]) {
  const view = render(<Cards ids={ids} />);
  const frame = (id: string) => screen.getByTestId(id);
  // tela de 768px de altura no jsdom: o meio fica em 384
  if (ids.includes("sev-modaintima")) place(frame("sev-modaintima"), 100); // centro 250
  if (ids.includes("lavacao-047")) place(frame("lavacao-047"), 230); // centro 380
  return { view, frame };
}

const isActive = (element: Element) =>
  element.getAttribute("data-active") === "true";

beforeEach(() => {
  jest.useFakeTimers();
  reducedMotion = false;
  observers = [];
  global.IntersectionObserver =
    FakeIntersectionObserver as unknown as typeof IntersectionObserver;
});

afterEach(() => {
  jest.useRealTimers();
  jest.restoreAllMocks();
  global.IntersectionObserver = OriginalObserver;
  Reflect.deleteProperty(document, "hidden");
});

describe("ShowcaseProvider: IntersectionObserver e visibilidade", () => {
  it("path: browser without IntersectionObserver -> cards register fine but none ever plays", () => {
    // @ts-expect-error simula um navegador sem IntersectionObserver
    global.IntersectionObserver = undefined;

    const { view, frame } = setup();
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(false);
    expect(isActive(frame("lavacao-047"))).toBe(false);
    expect(() => view.unmount()).not.toThrow();
  });

  it.each([
    [0.32, false],
    [0.33, true],
    [1, true],
  ])("path: %f of the card on screen -> visible: %s", (ratio, expected) => {
    const { frame } = setup(["sev-modaintima"]);

    report(frame("sev-modaintima"), ratio);
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(expected);
  });

  it("path: a visibility report about an element that is not a card -> ignored", () => {
    const { frame } = setup(["sev-modaintima"]);
    const stranger = document.createElement("div");
    report(frame("sev-modaintima"), 0.8);
    flush();

    report(stranger, 1);
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(true);
  });

  it("path: the card leaves the screen -> it stops being the active one", () => {
    const { frame } = setup(["sev-modaintima"]);
    report(frame("sev-modaintima"), 0.8);
    flush();
    expect(isActive(frame("sev-modaintima"))).toBe(true);

    report(frame("sev-modaintima"), 0);
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(false);
  });

  it("path: hidden tab -> nobody plays; back to visible -> the closest card plays again", () => {
    const { frame } = setup();
    report(frame("sev-modaintima"), 0.8);
    report(frame("lavacao-047"), 0.8);
    flush();
    expect(isActive(frame("lavacao-047"))).toBe(true);

    Object.defineProperty(document, "hidden", {
      configurable: true,
      value: true,
    });
    act(() => {
      document.dispatchEvent(new Event("visibilitychange"));
    });
    flush();
    expect(isActive(frame("lavacao-047"))).toBe(false);
    expect(isActive(frame("sev-modaintima"))).toBe(false);

    Object.defineProperty(document, "hidden", {
      configurable: true,
      value: false,
    });
    act(() => {
      document.dispatchEvent(new Event("visibilitychange"));
    });
    flush();
    expect(isActive(frame("lavacao-047"))).toBe(true);
  });
});

describe("ShowcaseProvider: mouse e foco", () => {
  function hoverSetup() {
    const result = setup();
    report(result.frame("sev-modaintima"), 0.8);
    report(result.frame("lavacao-047"), 0.8);
    flush();
    return result;
  }

  it("path: a pen counts as a pointer that hovers", () => {
    const { frame } = hoverSetup();

    fireEvent.pointerEnter(
      frame("sev-modaintima").closest(".ds-card") as HTMLElement,
      { pointerType: "pen" },
    );
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(true);
  });

  it("path: another card's pointer leaves -> the hovered card keeps the video", () => {
    const { frame } = hoverSetup();
    const sev = frame("sev-modaintima").closest(".ds-card") as HTMLElement;
    const lavacao = frame("lavacao-047").closest(".ds-card") as HTMLElement;
    fireEvent.pointerEnter(sev, { pointerType: "mouse" });
    flush();
    expect(isActive(frame("sev-modaintima"))).toBe(true);

    fireEvent.pointerLeave(lavacao, { pointerType: "mouse" });
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(true);
  });

  it("path: the hovered card is not on screen -> the closest visible card plays instead", () => {
    const { frame } = hoverSetup();
    report(frame("sev-modaintima"), 0);
    fireEvent.pointerEnter(
      frame("sev-modaintima").closest(".ds-card") as HTMLElement,
      { pointerType: "mouse" },
    );
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(false);
    expect(isActive(frame("lavacao-047"))).toBe(true);
  });

  it("path: focus moves to another element inside the same card -> hover is kept", () => {
    const { frame } = hoverSetup();
    const card = frame("sev-modaintima").closest(".ds-card") as HTMLElement;
    const inside = screen.getByRole("button", {
      name: /ampliar sev-modaintima/,
    });
    fireEvent.focusIn(inside);
    flush();
    expect(isActive(frame("sev-modaintima"))).toBe(true);

    fireEvent.focusOut(card, { relatedTarget: inside });
    flush();

    expect(isActive(frame("sev-modaintima"))).toBe(true);
  });

  it.each([
    [
      "to another card",
      () => screen.getByRole("button", { name: /ampliar lavacao-047/ }),
    ],
    ["to nothing", () => null],
  ])(
    "path: focus leaves the card %s -> hover is released",
    (_label, target) => {
      const { frame } = hoverSetup();
      const card = frame("sev-modaintima").closest(".ds-card") as HTMLElement;
      fireEvent.focusIn(
        screen.getByRole("button", { name: /ampliar sev-modaintima/ }),
      );
      flush();
      expect(isActive(frame("sev-modaintima"))).toBe(true);

      fireEvent.focusOut(card, { relatedTarget: target() });
      flush();

      expect(isActive(frame("sev-modaintima"))).toBe(false);
      expect(isActive(frame("lavacao-047"))).toBe(true);
    },
  );

  it("path: the hovered card is removed from the page -> its hover is dropped and another card plays", () => {
    function Swap() {
      const [showFirst, setShowFirst] = useState(true);
      return (
        <ShowcaseProvider projects={projects}>
          {showFirst && <Card id="sev-modaintima" />}
          <Card id="lavacao-047" />
          <button type="button" onClick={() => setShowFirst(false)}>
            remover o primeiro
          </button>
        </ShowcaseProvider>
      );
    }
    render(<Swap />);
    const sev = screen.getByTestId("sev-modaintima");
    const lavacao = screen.getByTestId("lavacao-047");
    place(sev, 100);
    place(lavacao, 230);
    report(sev, 0.8);
    report(lavacao, 0.8);
    fireEvent.pointerEnter(sev.closest(".ds-card") as HTMLElement, {
      pointerType: "mouse",
    });
    flush();
    expect(isActive(sev)).toBe(true);

    fireEvent.click(screen.getByRole("button", { name: "remover o primeiro" }));
    flush();

    expect(screen.queryByTestId("sev-modaintima")).toBeNull();
    expect(isActive(lavacao)).toBe(true);
  });
});

describe("ShowcaseProvider: pausa e janela ampliada", () => {
  it("path: the visitor pauses and resumes -> no card plays while paused", () => {
    const { frame } = setup(["lavacao-047"]);
    report(frame("lavacao-047"), 0.8);
    flush();
    expect(isActive(frame("lavacao-047"))).toBe(true);

    fireEvent.click(
      screen.getByRole("button", { name: /pausa lavacao-047 false/ }),
    );
    flush();
    expect(isActive(frame("lavacao-047"))).toBe(false);

    fireEvent.click(
      screen.getByRole("button", { name: /pausa lavacao-047 true/ }),
    );
    flush();
    expect(isActive(frame("lavacao-047"))).toBe(true);
  });

  it("path: opening a project that is not part of the showcase -> no window", () => {
    function OpenOutsider() {
      const { open } = useShowcaseCard("reddit-explorer");
      return (
        <button type="button" onClick={open}>
          ampliar reddit-explorer
        </button>
      );
    }
    render(
      <ShowcaseProvider projects={projects}>
        <OpenOutsider />
      </ShowcaseProvider>,
    );

    fireEvent.click(
      screen.getByRole("button", { name: /ampliar reddit-explorer/ }),
    );
    flush();

    expect(screen.queryByRole("dialog")).toBeNull();
  });

  it("path: navigating in the window to a valid index -> changes project; to an invalid one -> closes", () => {
    setup();
    fireEvent.click(
      screen.getByRole("button", { name: /ampliar lavacao-047/ }),
    );
    expect(screen.getByRole("dialog")).toHaveTextContent("aberto:1");

    fireEvent.click(screen.getByRole("button", { name: "ir para o primeiro" }));
    expect(screen.getByRole("dialog")).toHaveTextContent("aberto:0");

    fireEvent.click(
      screen.getByRole("button", { name: "ir para um que não existe" }),
    );
    expect(screen.queryByRole("dialog")).toBeNull();
  });

  it("path: reduced motion -> pausing and resuming never makes a card play", () => {
    reducedMotion = true;
    const { frame } = setup(["lavacao-047"]);
    report(frame("lavacao-047"), 1);
    flush();

    fireEvent.click(
      screen.getByRole("button", { name: /pausa lavacao-047 false/ }),
    );
    flush();
    fireEvent.click(
      screen.getByRole("button", { name: /pausa lavacao-047 true/ }),
    );
    flush();

    expect(isActive(frame("lavacao-047"))).toBe(false);
  });
});

describe("ShowcaseProvider: trabalho por quadro", () => {
  it("path: no card registered -> scroll and resize schedule no frame", () => {
    const raf = jest.spyOn(window, "requestAnimationFrame");
    render(
      <ShowcaseProvider projects={projects}>
        <p>sem cards</p>
      </ShowcaseProvider>,
    );
    flush();
    raf.mockClear();

    act(() => {
      window.dispatchEvent(new Event("scroll"));
      window.dispatchEvent(new Event("resize"));
      document.dispatchEvent(new Event("visibilitychange"));
    });
    flush();

    expect(raf).not.toHaveBeenCalled();
  });

  it("path: several scrolls inside one frame -> evaluated once", () => {
    const { frame } = setup(["lavacao-047"]);
    report(frame("lavacao-047"), 0.8);
    flush();
    const raf = jest.spyOn(window, "requestAnimationFrame");
    raf.mockClear();

    act(() => {
      window.dispatchEvent(new Event("scroll"));
      window.dispatchEvent(new Event("scroll"));
      window.dispatchEvent(new Event("scroll"));
    });

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

describe("ShowcaseProvider: ganchos fora do provedor e cartão sem .ds-card", () => {
  it("path: hooks used outside the provider -> empty list, and open/toggle do nothing", () => {
    function Outsider() {
      const items = useShowcaseItems();
      const open = useShowcaseOpen();
      const { toggleAutoplay, open: openCard, active } = useShowcaseCard("x");
      return (
        <button
          type="button"
          onClick={() => {
            open("sev-modaintima");
            openCard();
            toggleAutoplay();
          }}
        >
          itens:{items.length} ativo:{String(active)}
        </button>
      );
    }
    render(<Outsider />);

    const button = screen.getByRole("button", { name: "itens:0 ativo:false" });
    expect(() => fireEvent.click(button)).not.toThrow();
    expect(screen.queryByRole("dialog")).toBeNull();
  });

  it("path: a card whose frame has no .ds-card ancestor -> the frame itself listens for the pointer", () => {
    function Bare() {
      const { frameRef, active } = useShowcaseCard("lavacao-047");
      return <div ref={frameRef} data-testid="bare" data-active={active} />;
    }
    function Other() {
      const { frameRef, active } = useShowcaseCard("sev-modaintima");
      return <div ref={frameRef} data-testid="other" data-active={active} />;
    }
    render(
      <ShowcaseProvider projects={projects}>
        <Other />
        <Bare />
      </ShowcaseProvider>,
    );
    const bare = screen.getByTestId("bare");
    const other = screen.getByTestId("other");
    place(other, 230); // mais perto do meio da tela
    place(bare, 100);
    report(other, 0.8);
    report(bare, 0.8);
    flush();
    expect(isActive(other)).toBe(true);

    fireEvent.pointerEnter(bare, { pointerType: "mouse" });
    flush();

    expect(isActive(bare)).toBe(true);
    expect(isActive(other)).toBe(false);
  });

  it("path: projects missing from the list -> only showcase projects that exist are built, in showcase order", () => {
    const only = projects.filter((project) =>
      ["as-servicos", "sev-modaintima"].includes(project.id),
    );

    const items = buildShowcaseItems(only);

    expect(items.map((item) => item.config.id)).toEqual([
      "sev-modaintima",
      "as-servicos",
    ]);
    expect(buildShowcaseItems([])).toEqual([]);
  });
});