import { act, fireEvent, render, screen } from "@testing-library/react";
import { HOME_SUBJECT } from "@/lib/whatsapp";
import FloatingWhatsApp from "./FloatingWhatsApp";

const CONSENT_KEY = "evandro.analytics-consent.v1";

type Entry = Pick<IntersectionObserverEntry, "target" | "isIntersecting">;

let notify: (entries: Entry[]) => void = () => {};
const originalObserver = global.IntersectionObserver;

class FakeObserver {
  constructor(callback: IntersectionObserverCallback) {
    notify = (entries) =>
      callback(entries as IntersectionObserverEntry[], this as never);
  }
  observe = jest.fn();
  unobserve = jest.fn();
  disconnect = jest.fn();
  takeRecords = () => [];
}

function Page({ withInvites = true }: { withInvites?: boolean }) {
  return (
    <>
      {withInvites && (
        <>
          <a id="hero-contact-cta" href="/#contact">
            Conversar sobre meu projeto
          </a>
          <section id="contact" aria-label="Contato" />
        </>
      )}
      <FloatingWhatsApp />
    </>
  );
}

function setVisibility(hero: boolean, contact: boolean) {
  act(() =>
    notify([
      {
        target: document.getElementById("hero-contact-cta") as Element,
        isIntersecting: hero,
      },
      {
        target: document.getElementById("contact") as Element,
        isIntersecting: contact,
      },
    ]),
  );
}

const floatingLink = () =>
  screen.queryByRole("link", { name: "Chamar no WhatsApp" });

beforeEach(() => {
  global.IntersectionObserver =
    FakeObserver as unknown as typeof IntersectionObserver;
  jest.replaceProperty(process.env, "NODE_ENV", "production");
  localStorage.setItem(CONSENT_KEY, "granted");
  window.gtag = jest.fn();
});

afterEach(() => {
  global.IntersectionObserver = originalObserver;
  jest.restoreAllMocks();
  localStorage.clear();
  delete window.gtag;
});

it("stays hidden until the observer reports, then shows a 56px WhatsApp shortcut for small screens", () => {
  render(<Page />);
  expect(floatingLink()).toBeNull();

  setVisibility(false, false);
  const link = floatingLink();
  expect(link).toBeInTheDocument();
  expect(link).toHaveAttribute("target", "_blank");
  expect(link).toHaveAttribute("rel", "noopener noreferrer");
  const url = new URL(link?.getAttribute("href") ?? "");
  expect(url.origin).toBe("https://wa.me");
  // o dublê central de next/navigation abre na home ("/"): o botão fala do assunto da home
  expect(url.searchParams.get("text")).toContain(
    `Quero conversar sobre ${HOME_SUBJECT}.`,
  );
  // alvo de 56 px, canto inferior direito, só abaixo de 768 px
  expect(link).toHaveClass("h-14", "w-14");
  expect(link?.parentElement).toHaveClass("fixed", "right-sp-4", "md:hidden");
});

it("hides while the hero button is on screen", () => {
  render(<Page />);
  setVisibility(true, false);
  expect(floatingLink()).toBeNull();

  setVisibility(false, false);
  expect(floatingLink()).toBeInTheDocument();
});

it("hides while the contact section is on screen", () => {
  render(<Page />);
  setVisibility(false, true);
  expect(floatingLink()).toBeNull();

  setVisibility(false, false);
  expect(floatingLink()).toBeInTheDocument();
});

it("shows right away on a page that has neither the hero button nor the contact section", () => {
  render(<Page withInvites={false} />);
  expect(floatingLink()).toBeInTheDocument();
});

it("hides by CSS while the cookie bar is open (the data-cookie-bar mark on <html>), instead of sitting on top of it", () => {
  render(<Page />);
  setVisibility(false, false);

  const className = floatingLink()?.parentElement?.className ?? "";
  expect(className).toContain("[[data-cookie-bar=open]_&]:hidden");
  // não sobe mais pela altura da barra: some enquanto ela está aberta
  expect(className).not.toContain("--cookie-bar-height");
  expect(className).toContain(
    "bottom-[calc(var(--sp-4)+env(safe-area-inset-bottom))]",
  );
});

it("sits in a named complementary region (the 'region' landmark rule), which only exists while the shortcut shows", () => {
  render(<Page />);
  expect(screen.queryByRole("complementary")).toBeNull();

  setVisibility(false, false);
  const region = screen.getByRole("complementary", { name: "Contato rápido" });
  expect(region.tagName).toBe("ASIDE");
  expect(region).toContainElement(floatingLink());
});

it("reports the click as a floating WhatsApp handoff", () => {
  render(<Page />);
  setVisibility(false, false);

  fireEvent.click(floatingLink() as HTMLElement, { button: 0 });

  expect(window.gtag).toHaveBeenCalledTimes(1);
  expect(window.gtag).toHaveBeenCalledWith(
    "event",
    "whatsapp_open",
    expect.objectContaining({ placement: "floating" }),
  );
});