import { act, fireEvent, render, screen, within } from "@testing-library/react";
import { usePathname } from "next/navigation";
import { Header } from "./Header";

/**
 * Testes de caminhos-base de Header (complemento de Header.test.tsx): a barra que escurece com a rolagem,
 * as teclas do menu do celular que não o fecham e a rota ausente (fora do roteador).
 */

jest.mock("next/navigation", () => ({ usePathname: jest.fn() }));
jest.mock("next/link", () => ({
  __esModule: true,
  default: ({
    children,
    prefetch,
    ...props
  }: { children?: React.ReactNode; prefetch?: boolean | null } & Record<
    string,
    unknown
  >) => (
    <a data-prefetch={String(prefetch)} {...props}>
      {children}
    </a>
  ),
}));

function setScrollY(value: number) {
  Object.defineProperty(window, "scrollY", {
    value,
    configurable: true,
    writable: true,
  });
}

const header = () => screen.getByRole("banner");
/** Rolada: borda visível e fundo a 95% (sem backdrop-blur: o filtro refazia a pintura a cada quadro da rolagem). */
const isDark = () => header().className.includes("border-white/12");

beforeEach(() => {
  jest.mocked(usePathname).mockReturnValue("/");
  setScrollY(0);
});

afterEach(() => {
  jest.restoreAllMocks();
  setScrollY(0);
});

describe("Header: rolagem", () => {
  it("path: page at the top -> transparent border and solid background", () => {
    render(<Header />);

    expect(isDark()).toBe(false);
    expect(header()).toHaveClass("border-transparent");
  });

  it("path: scrolling down and back to the top -> bordered bar, then the plain one again, never with a backdrop blur", () => {
    render(<Header />);

    setScrollY(120);
    act(() => {
      window.dispatchEvent(new Event("scroll"));
    });
    expect(isDark()).toBe(true);
    expect(header()).not.toHaveClass("border-transparent");
    expect(header().className).not.toContain("backdrop-blur");

    // outro evento de rolagem sem mudar de lado: nada muda
    setScrollY(300);
    act(() => {
      window.dispatchEvent(new Event("scroll"));
    });
    expect(isDark()).toBe(true);

    setScrollY(0);
    act(() => {
      window.dispatchEvent(new Event("scroll"));
    });
    expect(isDark()).toBe(false);
  });

  it("path: page already scrolled when the header mounts -> starts with the bordered bar", () => {
    setScrollY(500);
    render(<Header />);

    expect(isDark()).toBe(true);
  });

  it("path: unmount -> the scroll listener is removed", () => {
    const remove = jest.spyOn(window, "removeEventListener");
    const { unmount } = render(<Header />);

    unmount();

    expect(remove).toHaveBeenCalledWith("scroll", expect.any(Function));
  });
});

describe("Header: teclado no menu do celular", () => {
  it("path: a key other than Escape inside the open menu -> the menu stays open and the key is not blocked", () => {
    render(<Header />);
    fireEvent.click(screen.getByRole("button", { name: "Abrir menu" }));
    const menu = screen.getByRole("navigation", { name: "Navegação mobile" });
    // Tab entre dois controles do meio da lista: segue o caminho normal (o foco só é preso nas pontas)
    const middle = within(menu).getByRole("link", { name: "Serviços" });
    act(() => middle.focus());

    // fireEvent devolve false só quando o evento foi cancelado (preventDefault)
    expect(fireEvent.keyDown(middle, { key: "Tab" })).toBe(true);
    expect(fireEvent.keyDown(menu, { key: "Enter" })).toBe(true);

    expect(screen.getByRole("button", { name: "Fechar menu" })).toHaveAttribute(
      "aria-expanded",
      "true",
    );
    expect(
      screen.getByRole("navigation", { name: "Navegação mobile" }),
    ).toBeInTheDocument();
  });

  it("path: Escape on the menu button while the menu is open -> closes it and keeps the focus on the button", () => {
    render(<Header />);
    const button = screen.getByRole("button", { name: "Abrir menu" });
    fireEvent.click(button);
    act(() => button.focus());

    expect(fireEvent.keyDown(button, { key: "Escape" })).toBe(false);

    const closed = screen.getByRole("button", { name: "Abrir menu" });
    expect(closed).toHaveAttribute("aria-expanded", "false");
    expect(closed).toHaveFocus();
    expect(
      screen.queryByRole("navigation", { name: "Navegação mobile" }),
    ).toBeNull();
  });

  it("path: Escape while the menu is already closed -> nothing opens", () => {
    render(<Header />);
    const button = screen.getByRole("button", { name: "Abrir menu" });

    fireEvent.keyDown(button, { key: "Escape" });

    expect(button).toHaveAttribute("aria-expanded", "false");
    expect(
      screen.queryByRole("navigation", { name: "Navegação mobile" }),
    ).toBeNull();
  });
});

describe("Header: menu aberto, caminhos de borda do foco, do clique e da janela", () => {
  /** O cabeçalho com o conteúdo da página que o menu aberto torna inerte (id do layout). */
  function Page() {
    return (
      <>
        <Header />
        <div id="main-content" tabIndex={-1}>
          <button type="button">Botão do conteúdo</button>
        </div>
      </>
    );
  }
  const openMenu = () =>
    fireEvent.click(screen.getByRole("button", { name: "Abrir menu" }));
  const content = () => document.getElementById("main-content") as HTMLElement;

  afterEach(() => {
    document.documentElement.style.removeProperty("overflow");
  });

  it("path: Tab with no control left to focus in the header -> the key is not blocked and the focus does not move", () => {
    render(<Page />);
    openMenu();
    const banner = screen.getByRole("banner");
    for (const button of banner.querySelectorAll("button"))
      button.setAttribute("disabled", "");
    for (const link of banner.querySelectorAll("a"))
      link.removeAttribute("href");
    act(() => document.body.focus());

    expect(fireEvent.keyDown(document.body, { key: "Tab" })).toBe(true);
    expect(
      fireEvent.keyDown(document.body, { key: "Tab", shiftKey: true }),
    ).toBe(true);

    expect(document.body).toHaveFocus();
  });

  it("path: click whose target is not an element (the document itself) -> the page stays locked", () => {
    render(<Page />);
    openMenu();

    fireEvent.click(document);

    expect(content()).toHaveAttribute("inert");
    expect(document.documentElement.style.overflow).toBe("hidden");
  });

  it("path: click on something inside the header that is not a link -> the page stays locked", () => {
    render(<Page />);
    openMenu();

    fireEvent.click(
      screen.getByRole("navigation", { name: "Navegação mobile" }),
    );

    expect(content()).toHaveAttribute("inert");
    expect(document.documentElement.style.overflow).toBe("hidden");
  });

  it("path: click on a link inside the header -> the page is released at once", () => {
    render(<Page />);
    openMenu();

    fireEvent.click(
      within(
        screen.getByRole("navigation", { name: "Navegação mobile" }),
      ).getByRole("link", { name: "Cases" }),
    );

    expect(content()).not.toHaveAttribute("inert");
    expect(document.documentElement.style.overflow).toBe("");
  });

  it("path: no matchMedia at all in the browser -> the menu still opens and closes", () => {
    const original = window.matchMedia;
    window.matchMedia = undefined as unknown as typeof window.matchMedia;
    try {
      render(<Page />);
      openMenu();
      expect(
        screen.getByRole("navigation", { name: "Navegação mobile" }),
      ).toBeInTheDocument();

      fireEvent.click(screen.getByRole("button", { name: "Fechar menu" }));

      expect(
        screen.queryByRole("navigation", { name: "Navegação mobile" }),
      ).toBeNull();
      expect(content()).not.toHaveAttribute("inert");
    } finally {
      window.matchMedia = original;
    }
  });

  it("path: matchMedia returns an object with no change listener (older browsers) -> the menu still opens and closes", () => {
    const original = window.matchMedia;
    window.matchMedia = jest.fn().mockReturnValue({
      matches: false,
    }) as unknown as typeof window.matchMedia;
    try {
      render(<Page />);
      openMenu();
      expect(
        screen.getByRole("navigation", { name: "Navegação mobile" }),
      ).toBeInTheDocument();

      fireEvent.click(screen.getByRole("button", { name: "Fechar menu" }));

      expect(
        screen.queryByRole("navigation", { name: "Navegação mobile" }),
      ).toBeNull();
      expect(content()).not.toHaveAttribute("inert");
    } finally {
      window.matchMedia = original;
    }
  });
});

describe("Header: rota ausente", () => {
  it("path: usePathname gives null (outside the router) -> the header button goes to the home form", () => {
    jest.mocked(usePathname).mockReturnValue(null as unknown as string);
    render(<Header />);

    expect(
      screen.getByRole("link", { name: "Falar sobre meu projeto" }),
    ).toHaveAttribute("href", "/#contact");
  });
});