import { fireEvent, render, screen } from "@testing-library/react";
import ContactOfferLink from "./ContactOfferLink";
import { focusFragment, onFragmentClick } from "./cinematic/fragment-nav";
import { CONTACT_KIND_EVENT } from "./contact-subject";

/**
 * Testes de caminhos-base de ContactOfferLink (complemento de ContactOfferLink.test.tsx).
 *
 * onClick (CC 6): fora da home | sem #contact | clique já tratado pelo gerenciador de âncoras | tecla modificadora ou
 * botão que não é o principal | rolagem suave | rolagem em salto (movimento reduzido). Os seis caminhos já estão
 * em ContactOfferLink.test.tsx; aqui entram o que faltava:
 *   - o gerenciador de âncoras REAL (fragment-nav.onFragmentClick) tratando o clique, em vez de um ouvinte avulso;
 *   - Alt como tecla modificadora;
 *   - showContactInAddress (CC 2): o endereço já é /#contact, então não há replaceState; e o `history.state` do roteador
 *     do Next sobrevive ao replaceState.
 */

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>
  ),
}));

const scrollIntoView = jest.fn();
const scrollTo = jest.fn();
let form: HTMLElement;
let replaceState: jest.SpyInstance;
const originalMatchMedia = window.matchMedia;
const originalScrollTo = window.scrollTo;

beforeEach(() => {
  scrollIntoView.mockReset();
  scrollTo.mockReset();
  HTMLElement.prototype.scrollIntoView = scrollIntoView;
  window.scrollTo = scrollTo as unknown as typeof window.scrollTo;
  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
    matches: false,
    media: query,
    addEventListener: jest.fn(),
    removeEventListener: jest.fn(),
  }));
  window.history.replaceState(null, "", "/");
  replaceState = jest.spyOn(window.history, "replaceState");
  form = document.createElement("section");
  form.id = "contact";
  document.body.append(form);
});

afterEach(() => {
  replaceState.mockRestore();
  form.remove();
  window.matchMedia = originalMatchMedia;
  window.scrollTo = originalScrollTo;
  window.history.replaceState(null, "", "/");
});

/** O que useCinematicScroll faz com um clique numa âncora: cancela, empurra o hash, rola e dá o foco. */
function installAnchorManager() {
  return onFragmentClick((hit, event) => {
    event.preventDefault();
    if (window.location.hash !== hit.hash)
      window.history.pushState(null, "", hit.hash);
    window.scrollTo({ top: 1234, behavior: "smooth" });
    focusFragment(hit.target);
  });
}

describe("ContactOfferLink: gerenciador de âncoras real", () => {
  it("path: the manager takes the click -> its scroll is the only one, the offer cleans the old ?tipo= and still tells the form", () => {
    window.history.replaceState(null, "", "/?tipo=site");
    replaceState.mockClear();
    const heard: unknown[] = [];
    const listener = (event: Event) =>
      heard.push((event as CustomEvent).detail);
    window.addEventListener(CONTACT_KIND_EVENT, listener);
    const stop = installAnchorManager();
    try {
      render(<ContactOfferLink kind="sistema">Começar</ContactOfferLink>);
      const entries = window.history.length;

      expect(
        fireEvent.click(screen.getByRole("link", { name: "Começar" })),
      ).toBe(false);

      expect(scrollTo).toHaveBeenCalledTimes(1);
      expect(scrollIntoView).not.toHaveBeenCalled();
      expect(form).toHaveFocus();
      expect(heard).toEqual(["sistema"]);
      // o gerenciador abriu uma entrada de histórico (/?tipo=site#contact); a oferta só a reescreve
      expect(window.history.length).toBe(entries + 1);
      expect(window.location.search).toBe("");
      expect(window.location.hash).toBe("#contact");
      expect(replaceState).toHaveBeenCalledTimes(1);
    } finally {
      stop();
      window.removeEventListener(CONTACT_KIND_EVENT, listener);
    }
  });

  it("path: the manager takes the click and the address is already /#contact -> no replaceState at all", () => {
    window.history.replaceState(null, "", "/#contact");
    replaceState.mockClear();
    const stop = installAnchorManager();
    try {
      render(<ContactOfferLink kind="site">Começar</ContactOfferLink>);

      fireEvent.click(screen.getByRole("link", { name: "Começar" }));

      expect(scrollTo).toHaveBeenCalledTimes(1);
      expect(replaceState).not.toHaveBeenCalled();
      expect(window.location.pathname + window.location.hash).toBe("/#contact");
    } finally {
      stop();
    }
  });

  it("path: no manager mounted -> the offer scrolls and focuses by itself, and a second click scrolls again", () => {
    render(<ContactOfferLink kind="site">Começar</ContactOfferLink>);
    const link = screen.getByRole("link", { name: "Começar" });

    expect(fireEvent.click(link)).toBe(false);
    expect(scrollIntoView).toHaveBeenCalledTimes(1);
    expect(form).toHaveFocus();
    expect(window.location.hash).toBe("#contact");

    // o endereço já é /#contact (o navegador não rolaria): a oferta rola de novo mesmo assim, sem tocar no endereço
    (document.activeElement as HTMLElement).blur();
    replaceState.mockClear();
    expect(fireEvent.click(link)).toBe(false);
    expect(scrollIntoView).toHaveBeenCalledTimes(2);
    expect(form).toHaveFocus();
    expect(replaceState).not.toHaveBeenCalled();
  });
});

describe("ContactOfferLink: teclas e histórico", () => {
  it("path: Alt held down -> not taken over (the browser keeps its own behavior)", () => {
    render(<ContactOfferLink kind="site">Começar</ContactOfferLink>);

    expect(
      fireEvent.click(screen.getByRole("link", { name: "Começar" }), {
        altKey: true,
      }),
    ).toBe(true);
    expect(scrollIntoView).not.toHaveBeenCalled();
    expect(replaceState).not.toHaveBeenCalled();
    expect(form).not.toHaveFocus();
  });

  it("path: a modified click still tells the form which type was chosen (the form may be in the same tab)", () => {
    const heard: unknown[] = [];
    const listener = (event: Event) =>
      heard.push((event as CustomEvent).detail);
    window.addEventListener(CONTACT_KIND_EVENT, listener);
    try {
      render(<ContactOfferLink kind="revisao">Começar</ContactOfferLink>);

      fireEvent.click(screen.getByRole("link", { name: "Começar" }), {
        ctrlKey: true,
      });

      expect(heard).toEqual(["revisao"]);
    } finally {
      window.removeEventListener(CONTACT_KIND_EVENT, listener);
    }
  });

  it("path: replaceState keeps the history.state of the router (the Next router stores its tree there)", () => {
    const routerState = { __NA: true, tree: ["", {}] };
    window.history.replaceState(routerState, "", "/?tipo=site#contact");
    replaceState.mockClear();
    render(<ContactOfferLink kind="sistema">Começar</ContactOfferLink>);

    fireEvent.click(screen.getByRole("link", { name: "Começar" }));

    expect(replaceState).toHaveBeenCalledWith(routerState, "", "/#contact");
    expect(window.history.state).toEqual(routerState);
  });
});