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

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>
  ),
}));

describe("ContactOfferLink", () => {
  it("links to the form with the type in the address, and prefetches nothing until hover or focus", () => {
    render(
      <ContactOfferLink kind="sistema" className="botao">
        Começar pelo sistema
      </ContactOfferLink>,
    );

    const link = screen.getByRole("link", { name: "Começar pelo sistema" });
    expect(link).toHaveAttribute("href", "/?tipo=sistema#contact-form");
    expect(link).toHaveClass("botao");
    expect(link).toHaveAttribute("data-prefetch", "false");
    fireEvent.mouseEnter(link);
    expect(link).toHaveAttribute("data-prefetch", "null");
  });

  it("tells the form which type was chosen, through a window event, when it is clicked", () => {
    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" }));
      expect(heard).toEqual(["revisao"]);
    } finally {
      window.removeEventListener(CONTACT_KIND_EVENT, listener);
    }
  });

  it("still tells the form when another handler already cancelled the click (the home scroll manager does that to scroll by itself)", () => {
    const heard: unknown[] = [];
    const listener = (event: Event) =>
      heard.push((event as CustomEvent).detail);
    const cancel = (event: Event) => event.preventDefault();
    window.addEventListener(CONTACT_KIND_EVENT, listener);
    document.addEventListener("click", cancel, true);
    try {
      render(<ContactOfferLink kind="site">Começar</ContactOfferLink>);

      fireEvent.click(screen.getByRole("link", { name: "Começar" }));
      expect(heard).toEqual(["site"]);
    } finally {
      window.removeEventListener(CONTACT_KIND_EVENT, listener);
      document.removeEventListener("click", cancel, true);
    }
  });
});

describe("ContactOfferLink: rolagem até o formulário", () => {
  const scrollIntoView = jest.fn();
  const original = window.matchMedia;
  let form: HTMLElement;

  const setReducedMotion = (reduced: boolean) => {
    window.matchMedia = jest.fn().mockImplementation((query: string) => ({
      matches: reduced && query === "(prefers-reduced-motion: reduce)",
      media: query,
      addEventListener: jest.fn(),
      removeEventListener: jest.fn(),
    }));
  };

  beforeEach(() => {
    scrollIntoView.mockReset();
    HTMLElement.prototype.scrollIntoView = scrollIntoView;
    window.history.replaceState(null, "", "/");
    setReducedMotion(false);
    form = document.createElement("section");
    form.id = "contact-form";
    document.body.append(form);
  });

  afterEach(() => {
    form.remove();
    window.matchMedia = original;
    window.history.replaceState(null, "", "/");
  });

  it("cancels the navigation on the home, rolls to #contact-form, focuses the form and leaves the address as /#contact-form", () => {
    const heard: unknown[] = [];
    const listener = (event: Event) =>
      heard.push((event as CustomEvent).detail);
    window.addEventListener(CONTACT_KIND_EVENT, listener);
    const pushState = jest.spyOn(window.history, "pushState");
    try {
      render(
        <ContactOfferLink kind="site">Começar pelo site</ContactOfferLink>,
      );
      const link = screen.getByRole("link", { name: "Começar pelo site" });

      // fireEvent devolve false quando alguém chamou preventDefault: o Link do Next não navega
      expect(fireEvent.click(link)).toBe(false);
      expect(heard).toEqual(["site"]);
      expect(scrollIntoView).toHaveBeenCalledTimes(1);
      expect(scrollIntoView).toHaveBeenCalledWith({
        behavior: "smooth",
        block: "start",
      });
      expect(form).toHaveFocus();
      expect(window.location.pathname + window.location.search).toBe("/");
      expect(window.location.hash).toBe("#contact-form");
      expect(pushState).not.toHaveBeenCalled();
    } finally {
      pushState.mockRestore();
      window.removeEventListener(CONTACT_KIND_EVENT, listener);
    }
  });

  it("jumps without animation when the visitor asks for reduced motion", () => {
    setReducedMotion(true);
    render(<ContactOfferLink kind="sistema">Começar</ContactOfferLink>);

    fireEvent.click(screen.getByRole("link", { name: "Começar" }));
    expect(scrollIntoView).toHaveBeenCalledWith({
      behavior: "instant",
      block: "start",
    });
  });

  it("drops the ?tipo= left by an earlier offer or by the arrival from another page, and keeps the other parameters", () => {
    window.history.replaceState(
      null,
      "",
      "/?utm_source=ads&tipo=site#contact-form",
    );
    render(<ContactOfferLink kind="revisao">Começar</ContactOfferLink>);

    fireEvent.click(screen.getByRole("link", { name: "Começar" }));
    expect(window.location.search).toBe("?utm_source=ads");
    expect(window.location.hash).toBe("#contact-form");
  });

  it("leaves the click alone when the scroll manager already took it (no second scroll), still cleaning the address", () => {
    window.history.replaceState(null, "", "/?tipo=site#contact-form");
    const cancel = (event: Event) => event.preventDefault();
    document.addEventListener("click", cancel, true);
    try {
      render(<ContactOfferLink kind="sistema">Começar</ContactOfferLink>);

      fireEvent.click(screen.getByRole("link", { name: "Começar" }));
      expect(scrollIntoView).not.toHaveBeenCalled();
      expect(window.location.search).toBe("");
      expect(window.location.hash).toBe("#contact-form");
    } finally {
      document.removeEventListener("click", cancel, true);
    }
  });

  it("does not take over a click with a modifier key (new tab) or the middle button", () => {
    render(<ContactOfferLink kind="site">Começar</ContactOfferLink>);
    const link = screen.getByRole("link", { name: "Começar" });

    expect(fireEvent.click(link, { ctrlKey: true })).toBe(true);
    expect(fireEvent.click(link, { metaKey: true })).toBe(true);
    expect(fireEvent.click(link, { shiftKey: true })).toBe(true);
    expect(fireEvent.click(link, { button: 1 })).toBe(true);
    expect(scrollIntoView).not.toHaveBeenCalled();
    expect(window.location.hash).toBe("");
  });

  it("does not cancel anything outside the home: the Link navigates to /?tipo=…#contact-form", () => {
    window.history.replaceState(null, "", "/privacidade");
    render(<ContactOfferLink kind="revisao">Começar</ContactOfferLink>);
    const link = screen.getByRole("link", { name: "Começar" });

    expect(link).toHaveAttribute("href", "/?tipo=revisao#contact-form");
    expect(fireEvent.click(link)).toBe(true);
    expect(scrollIntoView).not.toHaveBeenCalled();
    expect(window.location.pathname).toBe("/privacidade");
    expect(window.location.hash).toBe("");
  });

  it("falls back to the Link navigation when the page has no #contact-form", () => {
    form.remove();
    render(<ContactOfferLink kind="site">Começar</ContactOfferLink>);

    expect(fireEvent.click(screen.getByRole("link", { name: "Começar" }))).toBe(
      true,
    );
    expect(scrollIntoView).not.toHaveBeenCalled();
    document.body.append(form);
  });
});