import { act, fireEvent, render, screen } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import type { ComponentProps } from "react";
import { resetNavigation, setNavigation } from "@/__mocks__/next/navigation";
import { HOME_SUBJECT } from "@/lib/whatsapp";
import FloatingWhatsApp from "./FloatingWhatsApp";
import GoogleAnalytics from "./GoogleAnalytics";

/**
 * Testes de caminhos-base de FloatingWhatsApp (complemento de FloatingWhatsApp.test.tsx):
 * cada convite (botão do hero, seção de contato) sozinho na página, relatórios parciais do observador,
 * desconexão ao desmontar e a convivência com a barra de cookies.
 * A regra "só abaixo de 768 px" é CSS (md:hidden); o jsdom não avalia media queries, então só a classe é conferida.
 */

jest.mock("next/script", () => ({
  __esModule: true,
  default: ({
    strategy: _strategy,
    ...props
  }: ComponentProps<"script"> & { strategy?: string }) => <script {...props} />,
}));

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

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

const instances: FakeObserver[] = [];
const originalObserver = global.IntersectionObserver;

class FakeObserver {
  observed: Element[] = [];
  disconnect = jest.fn();
  constructor(private callback: IntersectionObserverCallback) {
    instances.push(this);
  }
  observe = jest.fn((target: Element) => {
    this.observed.push(target);
  });
  unobserve = jest.fn();
  takeRecords = () => [];
  report(entries: Entry[]) {
    act(() =>
      this.callback(entries as IntersectionObserverEntry[], this as never),
    );
  }
}

const hero = () => document.getElementById("hero-contact-cta") as Element;
const contact = () => document.getElementById("contact") as Element;
const floatingLink = () =>
  screen.queryByRole("link", { name: "Chamar no WhatsApp" });

beforeEach(() => {
  resetNavigation();
  instances.length = 0;
  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;
  document.documentElement.style.removeProperty("--cookie-bar-height");
  document.documentElement.removeAttribute("data-cookie-bar");
});

function renderBoth() {
  return render(
    <>
      <a id="hero-contact-cta" href="/#contact">
        Conversar
      </a>
      <section id="contact" aria-label="Contato" />
      <FloatingWhatsApp />
    </>,
  );
}

describe("FloatingWhatsApp: convites presentes na página", () => {
  it("path: only the hero button exists -> observes just it and follows its visibility", () => {
    render(
      <>
        <a id="hero-contact-cta" href="/#contact">
          Conversar sobre meu projeto
        </a>
        <FloatingWhatsApp />
      </>,
    );
    expect(instances).toHaveLength(1);
    expect(instances[0].observed).toEqual([hero()]);
    expect(floatingLink()).toBeNull();

    instances[0].report([{ target: hero(), isIntersecting: true }]);
    expect(floatingLink()).toBeNull();

    instances[0].report([{ target: hero(), isIntersecting: false }]);
    expect(floatingLink()).toBeInTheDocument();
  });

  it("path: only the contact section exists -> observes just it and follows its visibility", () => {
    render(
      <>
        <section id="contact" aria-label="Contato" />
        <FloatingWhatsApp />
      </>,
    );
    expect(instances[0].observed).toEqual([contact()]);

    instances[0].report([{ target: contact(), isIntersecting: true }]);
    expect(floatingLink()).toBeNull();

    instances[0].report([{ target: contact(), isIntersecting: false }]);
    expect(floatingLink()).toBeInTheDocument();
  });

  it("path: neither invite exists -> no observer is created and the button shows at once", () => {
    render(<FloatingWhatsApp />);

    expect(instances).toHaveLength(0);
    expect(floatingLink()).toBeInTheDocument();
  });

  it("path: both invites exist -> both are observed", () => {
    renderBoth();

    expect(instances[0].observed).toEqual([hero(), contact()]);
  });
});

describe("FloatingWhatsApp: relatórios do observador", () => {
  it("path: a later report about one invite keeps what was said about the other", () => {
    renderBoth();
    const [observer] = instances;
    observer.report([
      { target: hero(), isIntersecting: true },
      { target: contact(), isIntersecting: false },
    ]);
    expect(floatingLink()).toBeNull();

    // só o contato é reportado de novo; o hero continua à vista
    observer.report([{ target: contact(), isIntersecting: false }]);
    expect(floatingLink()).toBeNull();

    observer.report([{ target: hero(), isIntersecting: false }]);
    expect(floatingLink()).toBeInTheDocument();
  });

  it("path: both invites on screen at once -> hidden until both leave", () => {
    renderBoth();
    const [observer] = instances;
    observer.report([
      { target: hero(), isIntersecting: true },
      { target: contact(), isIntersecting: true },
    ]);
    expect(floatingLink()).toBeNull();

    observer.report([{ target: hero(), isIntersecting: false }]);
    expect(floatingLink()).toBeNull();

    observer.report([{ target: contact(), isIntersecting: false }]);
    expect(floatingLink()).toBeInTheDocument();
  });

  it("path: an empty report -> nothing is visible, so the button shows", () => {
    renderBoth();

    instances[0].report([]);

    expect(floatingLink()).toBeInTheDocument();
  });

  it("path: unmount -> the observer is disconnected", () => {
    const { unmount } = renderBoth();
    expect(instances[0].disconnect).not.toHaveBeenCalled();

    unmount();

    expect(instances[0].disconnect).toHaveBeenCalledTimes(1);
  });
});

describe("FloatingWhatsApp: conteúdo e cliques", () => {
  it("path: the shortcut is CSS-limited to small screens and sized as a 56px target", () => {
    render(<FloatingWhatsApp />);

    const link = floatingLink();
    expect(link).toHaveClass("h-14", "w-14");
    expect(link?.parentElement).toHaveClass("md:hidden", "fixed", "right-sp-4");
  });

  it("path: click on the home reports the home subject as the service (the central navigation mock opens on '/')", () => {
    render(<FloatingWhatsApp />);

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

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

  it("path: click on a page without a subject reports 'Contato' as the service", () => {
    setNavigation({ pathname: "/privacidade" });
    render(<FloatingWhatsApp />);

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

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

describe("FloatingWhatsApp com a barra de cookies aberta", () => {
  it("path: the bar marks <html> while open, which hides the button by CSS, and drops the mark once a choice is made", async () => {
    const user = userEvent.setup();
    localStorage.clear();
    Object.defineProperty(HTMLElement.prototype, "offsetHeight", {
      configurable: true,
      get: () => 72,
    });
    try {
      render(
        <>
          <GoogleAnalytics />
          <FloatingWhatsApp />
        </>,
      );
      const refuse = await screen.findByRole("button", { name: "Recusar" });

      // a barra publica a altura (o menu do celular a usa) e marca o <html>; o botão flutuante some por CSS com a marca
      expect(
        document.documentElement.style.getPropertyValue("--cookie-bar-height"),
      ).toBe("72px");
      expect(document.documentElement).toHaveAttribute(
        "data-cookie-bar",
        "open",
      );
      expect(floatingLink()?.parentElement).toHaveClass(
        "[[data-cookie-bar=open]_&]:hidden",
      );

      await user.click(refuse);

      expect(
        document.documentElement.style.getPropertyValue("--cookie-bar-height"),
      ).toBe("");
      expect(document.documentElement).not.toHaveAttribute("data-cookie-bar");
      expect(floatingLink()).toBeInTheDocument();
    } finally {
      Reflect.deleteProperty(HTMLElement.prototype, "offsetHeight");
    }
  });
});