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

/**
 * O menu do celular aberto (complemento de Header.test.tsx): botão de contato acima da barra de cookies, fecha ao
 * trocar de rota e ao tocar no logo, deixa o conteúdo e o rodapé inertes, trava a rolagem, prende o foco e fecha
 * com Esc (ouvido no document), devolvendo o foco ao botão do menu.
 */

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>
  ),
}));

/** O cabeçalho com as duas partes da página que o menu torna inertes: o conteúdo e o rodapé (ids do layout). */
function Page() {
  return (
    <>
      <Header />
      <div id="main-content" tabIndex={-1}>
        <button type="button">Botão do conteúdo</button>
      </div>
      <div id="site-footer">
        <a href="#privacidade">Privacidade</a>
      </div>
    </>
  );
}

const main = () => document.getElementById("main-content") as HTMLElement;
const footer = () => document.getElementById("site-footer") as HTMLElement;
const menuButton = () =>
  screen.getByRole("button", { name: /^(Abrir|Fechar) menu$/ });
const openMenu = () =>
  fireEvent.click(screen.getByRole("button", { name: "Abrir menu" }));
const mobileMenu = () =>
  screen.queryByRole("navigation", { name: "Navegação mobile" });

/** Os controles que o Tab percorre com o menu aberto: logo, botão do menu, os cinco links e o botão de contato do painel. */
function trapOrder() {
  const panel = within(mobileMenu() as HTMLElement);
  return [
    screen.getByRole("link", { name: "Evandro.dev.br — início" }),
    menuButton(),
    ...panel.getAllByRole("link"),
  ];
}

beforeEach(() => {
  jest.mocked(usePathname).mockReturnValue("/");
  document.documentElement.style.removeProperty("overflow");
});

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

describe("Header: menu do celular e a barra de cookies", () => {
  it("adds the height of the cookie bar to the bottom spacing, so the contact button stays above it", () => {
    render(<Page />);
    openMenu();

    const panel = (mobileMenu() as HTMLElement).parentElement
      ?.parentElement as HTMLElement;
    expect(panel.className).toContain(
      "pb-[calc(var(--sp-6)+env(safe-area-inset-bottom)+var(--cookie-bar-height,0px))]",
    );
  });
});

describe("Header: o menu fecha sozinho", () => {
  it("closes when the route changes", () => {
    const { rerender } = render(<Page />);
    openMenu();
    expect(mobileMenu()).toBeInTheDocument();

    jest.mocked(usePathname).mockReturnValue("/cases");
    rerender(<Page />);

    expect(mobileMenu()).toBeNull();
    expect(menuButton()).toHaveAttribute("aria-expanded", "false");
    expect(main()).not.toHaveAttribute("inert");
  });

  it("stays open on a re-render that keeps the same route", () => {
    const { rerender } = render(<Page />);
    openMenu();

    rerender(<Page />);

    expect(mobileMenu()).toBeInTheDocument();
  });

  it("closes when the logo is tapped", () => {
    render(<Page />);
    openMenu();

    fireEvent.click(
      screen.getByRole("link", { name: "Evandro.dev.br — início" }),
    );

    expect(mobileMenu()).toBeNull();
    expect(main()).not.toHaveAttribute("inert");
    expect(document.documentElement.style.overflow).toBe("");
  });

  it("closes when the window grows to the desktop layout, where the menu button no longer exists", () => {
    const original = window.matchMedia;
    let onChange: ((event: { matches: boolean }) => void) | undefined;
    window.matchMedia = jest.fn().mockImplementation((query: string) => ({
      matches: false,
      media: query,
      addEventListener: (_type: string, listener: typeof onChange) => {
        onChange = listener;
      },
      removeEventListener: jest.fn(),
    }));
    try {
      render(<Page />);
      openMenu();
      expect(window.matchMedia).toHaveBeenCalledWith("(min-width: 1280px)");

      act(() => onChange?.({ matches: false }));
      expect(mobileMenu()).toBeInTheDocument();

      act(() => onChange?.({ matches: true }));
      expect(mobileMenu()).toBeNull();
      expect(document.documentElement.style.overflow).toBe("");
    } finally {
      window.matchMedia = original;
    }
  });
});

describe("Header: página inerte e sem rolagem com o menu aberto", () => {
  it("makes the content and the footer inert and locks the page scroll while the menu is open, and undoes both on close", () => {
    render(<Page />);
    expect(main()).not.toHaveAttribute("inert");

    openMenu();
    expect(main()).toHaveAttribute("inert");
    expect(footer()).toHaveAttribute("inert");
    expect(document.documentElement.style.overflow).toBe("hidden");
    // o próprio cabeçalho nunca fica inerte
    expect(screen.getByRole("banner")).not.toHaveAttribute("inert");

    fireEvent.click(menuButton());
    expect(main()).not.toHaveAttribute("inert");
    expect(footer()).not.toHaveAttribute("inert");
    expect(document.documentElement.style.overflow).toBe("");
  });

  it("gives back the overflow the page already had", () => {
    document.documentElement.style.overflow = "scroll";
    render(<Page />);

    openMenu();
    expect(document.documentElement.style.overflow).toBe("hidden");
    fireEvent.click(menuButton());

    expect(document.documentElement.style.overflow).toBe("scroll");
  });

  it("works on a page without a footer wrapper (the parts that exist are still made inert)", () => {
    render(<Header />);
    document.body.insertAdjacentHTML(
      "beforeend",
      '<div id="main-content"></div>',
    );
    try {
      openMenu();
      expect(main()).toHaveAttribute("inert");
    } finally {
      main().remove();
    }
  });

  it("undoes everything when the header unmounts with the menu open", () => {
    const { unmount } = render(<Page />);
    openMenu();

    unmount();

    expect(document.documentElement.style.overflow).toBe("");
  });

  it("releases the page before any other click handler of the document runs, so a link to #id finds its target focusable", () => {
    render(<Page />);
    openMenu();
    const states: Array<{ inert: boolean; overflow: string }> = [];
    const record = () =>
      states.push({
        inert: main().hasAttribute("inert"),
        overflow: document.documentElement.style.overflow,
      });
    // o gerenciador de âncoras da home escuta o clique no document, na fase de captura
    document.addEventListener("click", record, true);
    try {
      fireEvent.click(
        within(mobileMenu() as HTMLElement).getByRole("link", {
          name: "Sobre",
        }),
      );
    } finally {
      document.removeEventListener("click", record, true);
    }

    expect(states).toEqual([{ inert: false, overflow: "" }]);
    expect(mobileMenu()).toBeNull();
  });

  it("does not release the page for a click outside the header", () => {
    render(<Page />);
    openMenu();

    // com o conteúdo inerte o clique real nem chega; o teste dispara direto para provar que o ouvinte só reage ao cabeçalho
    fireEvent.click(footer().querySelector("a") as HTMLElement);

    expect(main()).toHaveAttribute("inert");
    expect(mobileMenu()).toBeInTheDocument();
  });
});

describe("Header: Esc e foco com o menu aberto", () => {
  it("closes with Escape heard on the document, wherever the focus is, and puts the focus back on the menu button", () => {
    render(<Page />);
    openMenu();
    act(() => document.body.focus());

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

    expect(mobileMenu()).toBeNull();
    expect(main()).not.toHaveAttribute("inert");
    expect(menuButton()).toHaveAttribute("aria-expanded", "false");
    expect(menuButton()).toHaveFocus();
  });

  it("ignores Escape while the menu is closed", () => {
    render(<Page />);

    // sem menu aberto o ouvinte nem existe: o evento segue sem ser cancelado
    expect(fireEvent.keyDown(document, { key: "Escape" })).toBe(true);
    expect(mobileMenu()).toBeNull();
  });

  it("traps Tab: from the last control it goes to the first, and Shift+Tab from the first goes to the last", () => {
    render(<Page />);
    openMenu();
    const order = trapOrder();
    const first = order[0];
    const last = order[order.length - 1];
    // o botão de contato do painel é o último; o da barra de desktop e a navegação de desktop ficam fora do ciclo
    expect(last).toHaveAccessibleName("Falar sobre meu projeto");
    expect(order).toHaveLength(1 + 1 + 5 + 1);

    act(() => last.focus());
    expect(fireEvent.keyDown(last, { key: "Tab" })).toBe(false);
    expect(first).toHaveFocus();

    expect(fireEvent.keyDown(first, { key: "Tab", shiftKey: true })).toBe(
      false,
    );
    expect(last).toHaveFocus();
  });

  it("lets Tab move normally between two controls of the cycle", () => {
    render(<Page />);
    openMenu();
    const order = trapOrder();
    act(() => order[2].focus());

    expect(fireEvent.keyDown(order[2], { key: "Tab" })).toBe(true);
    expect(fireEvent.keyDown(order[2], { key: "Tab", shiftKey: true })).toBe(
      true,
    );
  });

  it("brings the focus back into the cycle when it is outside it, in the direction of the key", () => {
    render(<Page />);
    openMenu();
    const order = trapOrder();
    act(() => document.body.focus());

    expect(fireEvent.keyDown(document.body, { key: "Tab" })).toBe(false);
    expect(order[0]).toHaveFocus();

    act(() => document.body.focus());
    expect(
      fireEvent.keyDown(document.body, { key: "Tab", shiftKey: true }),
    ).toBe(false);
    expect(order[order.length - 1]).toHaveFocus();
  });

  it("does not trap Tab while the menu is closed", () => {
    render(<Page />);
    act(() => document.body.focus());

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

  it("closes with the menu button and keeps the focus on it", () => {
    render(<Page />);
    openMenu();
    act(() => menuButton().focus());

    fireEvent.click(menuButton());

    expect(mobileMenu()).toBeNull();
    expect(menuButton()).toHaveFocus();
  });
});

describe("Header: a barra de cookies aberta entra na armadilha de foco", () => {
  /** Como no layout (GoogleAnalytics.tsx): a barra vem antes do cabeçalho e não fica inerte; link da política, Aceitar e Recusar. */
  function PageWithCookieBar() {
    return (
      <>
        <section id={COOKIE_BAR_ID} role="dialog" aria-label="Cookies">
          <p>
            Usamos métricas de navegação do Google só se você permitir.{" "}
            <a href="/privacidade">Política de privacidade</a>
          </p>
          <button type="button">Aceitar</button>
          <button type="button">Recusar</button>
        </section>
        <Page />
      </>
    );
  }

  it("cycles through the policy link, Aceitar and Recusar before the header, and back from the contact button", () => {
    render(<PageWithCookieBar />);
    openMenu();
    const policy = screen.getByRole("link", {
      name: "Política de privacidade",
    });
    const accept = screen.getByRole("button", { name: "Aceitar" });
    const decline = screen.getByRole("button", { name: "Recusar" });
    const order = trapOrder();
    const last = order[order.length - 1];
    expect(policy).not.toHaveAttribute("inert");
    expect(accept).not.toHaveAttribute("inert");

    // do botão de contato (o último do cabeçalho) o Tab vai para o link da política, em vez de dar a volta no cabeçalho
    act(() => last.focus());
    expect(fireEvent.keyDown(last, { key: "Tab" })).toBe(false);
    expect(policy).toHaveFocus();

    // entre o link, Aceitar e Recusar o Tab segue normal; de Recusar vai para o logo, o primeiro do cabeçalho
    expect(fireEvent.keyDown(policy, { key: "Tab" })).toBe(true);
    act(() => accept.focus());
    expect(fireEvent.keyDown(accept, { key: "Tab" })).toBe(true);
    act(() => decline.focus());
    expect(fireEvent.keyDown(decline, { key: "Tab" })).toBe(true);

    // Shift+Tab do link da política (o primeiro do ciclo) volta ao botão de contato
    act(() => policy.focus());
    expect(fireEvent.keyDown(policy, { key: "Tab", shiftKey: true })).toBe(
      false,
    );
    expect(last).toHaveFocus();

    // e Shift+Tab de Aceitar ou de Recusar não é preso: o navegador anda um controle para trás
    act(() => accept.focus());
    expect(fireEvent.keyDown(accept, { key: "Tab", shiftKey: true })).toBe(
      true,
    );
  });

  it("closes with Escape and puts the focus back on the menu button, even from the cookie bar", () => {
    render(<PageWithCookieBar />);
    openMenu();
    act(() => screen.getByRole("button", { name: "Recusar" }).focus());

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

    expect(mobileMenu()).toBeNull();
    expect(menuButton()).toHaveFocus();
  });
});