import { render, screen, waitFor } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import type { ComponentProps } from "react";
import GoogleAnalytics from "./GoogleAnalytics";

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

const CONSENT_KEY = "evandro.analytics-consent.v1";
const GA_DISABLE_KEY = "ga-disable-G-QTT9QT0T3S";
const GA_SRC = "https://www.googletagmanager.com/gtag/js?id=G-QTT9QT0T3S";

type AnalyticsWindow = Window & {
  dataLayer?: IArguments[];
  gtag?: (...args: unknown[]) => void;
  [GA_DISABLE_KEY]?: boolean;
};

const analyticsWindow = window as AnalyticsWindow;

function consentUpdates(gtag: jest.Mock) {
  return gtag.mock.calls.filter(
    ([command, action]) => command === "consent" && action === "update",
  );
}

function setCookie(value: string) {
  // biome-ignore lint/suspicious/noDocumentCookie: JSDOM cookie setup is the behavior boundary exercised by revocation.
  document.cookie = value;
}

describe("GoogleAnalytics consent", () => {
  beforeEach(() => {
    jest.replaceProperty(process.env, "NODE_ENV", "production");
    document.getElementById("google-analytics-script")?.remove();
    localStorage.clear();
    setCookie("_ga=; Max-Age=0; Path=/");
    setCookie("_ga_PORTFOLIO=; Max-Age=0; Path=/");
    setCookie("portfolio_session=; Max-Age=0; Path=/");
    analyticsWindow.dataLayer = undefined;
    analyticsWindow.gtag = undefined;
    analyticsWindow[GA_DISABLE_KEY] = undefined;
  });

  afterEach(() => {
    jest.restoreAllMocks();
  });

  it("waits for a decision before loading analytics", async () => {
    render(<GoogleAnalytics />);

    expect(
      await screen.findByRole("button", { name: "Aceitar analytics" }),
    ).toBeVisible();
    expect(screen.getByRole("dialog")).toHaveAccessibleDescription();
    expect(
      screen.queryByTestId("google-analytics-script"),
    ).not.toBeInTheDocument();
    expect(
      screen.getByRole("link", { name: "Ler política de privacidade" }),
    ).toHaveAttribute("href", "/privacidade");
  });

  it("persists acceptance and enables analytics without advertising consent", async () => {
    const user = userEvent.setup();
    render(<GoogleAnalytics />);

    await user.click(
      await screen.findByRole("button", { name: "Aceitar analytics" }),
    );

    expect(localStorage.getItem(CONSENT_KEY)).toBe("granted");
    expect(screen.getByTestId("google-analytics-script")).toHaveAttribute(
      "src",
      GA_SRC,
    );
    const commands = analyticsWindow.dataLayer?.map((entry) =>
      Array.from(entry),
    );
    expect(commands).toContainEqual([
      "consent",
      "default",
      {
        analytics_storage: "denied",
        ad_storage: "denied",
        ad_user_data: "denied",
        ad_personalization: "denied",
      },
    ]);
    expect(commands).toContainEqual([
      "consent",
      "update",
      {
        analytics_storage: "granted",
        ad_storage: "denied",
        ad_user_data: "denied",
        ad_personalization: "denied",
      },
    ]);
    expect(commands).toContainEqual([
      "config",
      "G-QTT9QT0T3S",
      {
        allow_ad_personalization_signals: false,
        anonymize_ip: true,
      },
    ]);
    expect(commands).toContainEqual([
      "config",
      "AW-18432694647",
      { allow_ad_personalization_signals: false },
    ]);
    expect(commands).toContainEqual(["set", "ads_data_redaction", true]);
    expect(
      screen.getByRole("button", { name: "Preferências de analytics" }),
    ).not.toHaveFocus();
  });

  it("persists refusal and keeps analytics absent after reload", async () => {
    const user = userEvent.setup();
    const firstRender = render(<GoogleAnalytics />);

    await user.click(
      await screen.findByRole("button", { name: "Recusar analytics" }),
    );

    expect(localStorage.getItem(CONSENT_KEY)).toBe("denied");
    expect(
      screen.queryByTestId("google-analytics-script"),
    ).not.toBeInTheDocument();

    firstRender.unmount();
    render(<GoogleAnalytics />);

    expect(
      await screen.findByRole("button", { name: "Preferências de analytics" }),
    ).toBeVisible();
    expect(
      screen.queryByTestId("google-analytics-script"),
    ).not.toBeInTheDocument();
  });

  it("keeps preferences reachable and fully revokes analytics only", async () => {
    const user = userEvent.setup();
    localStorage.setItem(CONSENT_KEY, "granted");
    setCookie("_ga=main; Path=/");
    setCookie("_ga_PORTFOLIO=property; Path=/");
    setCookie("portfolio_session=keep; Path=/");
    const gtag = jest.fn();
    analyticsWindow.gtag = gtag;
    render(<GoogleAnalytics />);

    await screen.findByTestId("google-analytics-script");
    await user.click(
      screen.getByRole("button", { name: "Preferências de analytics" }),
    );
    await user.click(screen.getByRole("button", { name: "Revogar analytics" }));

    expect(localStorage.getItem(CONSENT_KEY)).toBe("denied");
    expect(analyticsWindow[GA_DISABLE_KEY]).toBe(true);
    expect(consentUpdates(gtag)).toContainEqual([
      "consent",
      "update",
      {
        analytics_storage: "denied",
        ad_storage: "denied",
        ad_user_data: "denied",
        ad_personalization: "denied",
      },
    ]);
    expect(document.cookie).not.toContain("_ga=");
    expect(document.cookie).not.toContain("_ga_PORTFOLIO=");
    expect(document.cookie).toContain("portfolio_session=keep");
    expect(
      screen.queryByTestId("google-analytics-script"),
    ).not.toBeInTheDocument();
    const preferencesButton = screen.getByRole("button", {
      name: "Preferências de analytics",
    });
    expect(preferencesButton).toBeVisible();
    expect(preferencesButton).toHaveFocus();
  });

  it("restores focus after closing or applying opened preferences", async () => {
    const user = userEvent.setup();
    localStorage.setItem(CONSENT_KEY, "denied");
    render(<GoogleAnalytics />);

    const preferencesButton = await screen.findByRole("button", {
      name: "Preferências de analytics",
    });
    await user.click(preferencesButton);
    expect(
      screen.getByRole("link", { name: "Ler política de privacidade" }),
    ).toHaveAttribute("href", "/privacidade");
    await user.click(
      screen.getByRole("button", { name: "Fechar preferências" }),
    );
    expect(preferencesButton).toHaveFocus();

    await user.click(preferencesButton);
    await user.click(screen.getByRole("button", { name: "Aceitar analytics" }));
    expect(preferencesButton).toHaveFocus();
  });

  it("fails closed when local storage is unavailable", async () => {
    const user = userEvent.setup();
    jest.spyOn(Storage.prototype, "getItem").mockImplementation(() => {
      throw new Error("storage blocked");
    });
    jest.spyOn(Storage.prototype, "setItem").mockImplementation(() => {
      throw new Error("storage blocked");
    });
    render(<GoogleAnalytics />);

    await user.click(
      await screen.findByRole("button", { name: "Aceitar analytics" }),
    );

    await waitFor(() => {
      expect(
        screen.queryByTestId("google-analytics-script"),
      ).not.toBeInTheDocument();
    });
  });

  it("reports when revocation cannot be persisted", async () => {
    const user = userEvent.setup();
    localStorage.setItem(CONSENT_KEY, "granted");
    jest.spyOn(Storage.prototype, "setItem").mockImplementation(() => {
      throw new Error("storage blocked");
    });
    render(<GoogleAnalytics />);

    await screen.findByTestId("google-analytics-script");
    await user.click(
      screen.getByRole("button", { name: "Preferências de analytics" }),
    );
    await user.click(screen.getByRole("button", { name: "Revogar analytics" }));

    expect(
      screen.getByRole("alert", {
        name: "Falha ao salvar o consentimento",
      }),
    ).toHaveTextContent(
      "Não foi possível salvar a revogação. Tente novamente para concluir.",
    );
    expect(analyticsWindow[GA_DISABLE_KEY]).not.toBe(true);
    expect(
      screen.getByRole("button", { name: "Revogar analytics" }),
    ).toBeVisible();
  });

  it("reports when refusal cannot be persisted", async () => {
    const user = userEvent.setup();
    jest.spyOn(Storage.prototype, "setItem").mockImplementation(() => {
      throw new Error("storage blocked");
    });
    render(<GoogleAnalytics />);

    await user.click(
      await screen.findByRole("button", { name: "Recusar analytics" }),
    );

    expect(
      screen.getByRole("alert", {
        name: "Falha ao salvar o consentimento",
      }),
    ).toHaveTextContent(
      "Não foi possível salvar sua recusa. Tente novamente para concluir.",
    );
    expect(
      screen.getByRole("button", { name: "Recusar analytics" }),
    ).toBeVisible();
    expect(
      screen.queryByRole("button", { name: "Preferências de analytics" }),
    ).not.toBeInTheDocument();
  });
});