import "@testing-library/jest-dom/vitest";
import { act, cleanup, fireEvent, render, screen } from "@testing-library/react";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import type { RouteResult } from "@watermaps/shared";
import { VoyageNavigationTools } from "../src/components/VoyageNavigationTools";

const originalGeolocation = Object.getOwnPropertyDescriptor(navigator, "geolocation");
const originalVibrate = Object.getOwnPropertyDescriptor(navigator, "vibrate");

beforeEach(() => localStorage.clear());

afterEach(() => {
  cleanup();
  localStorage.clear();
  restoreNavigatorProperty("geolocation", originalGeolocation);
  restoreNavigatorProperty("vibrate", originalVibrate);
});

describe("VoyageNavigationTools", () => {
  it("does not request geolocation before the skipper starts the alarm", () => {
    const watchPosition = vi.fn(() => 17);
    installGeolocation(watchPosition, vi.fn());

    render(<VoyageNavigationTools route={routeFixture} />);

    expect(watchPosition).not.toHaveBeenCalled();
    expect(screen.getByText(/GPS wird erst nach/)).toBeInTheDocument();
  });

  it("does not open a second GPS watch while the course assistant is active", () => {
    const watchPosition = vi.fn(() => 17);
    installGeolocation(watchPosition, vi.fn());

    render(<VoyageNavigationTools route={routeFixture} courseAssistantActive />);

    expect(screen.getByRole("button", { name: "Kursalarm ist im Kursassistenten enthalten" })).toBeDisabled();
    expect(screen.getByText(/Querabweichung.*Kursassistenten/)).toBeVisible();
    expect(watchPosition).not.toHaveBeenCalled();
  });

  it("starts explicitly and warns when the vessel leaves the route", () => {
    let success: PositionCallback | undefined;
    const watchPosition = vi.fn((next: PositionCallback) => {
      success = next;
      return 42;
    });
    const clearWatch = vi.fn();
    const vibrate = vi.fn();
    installGeolocation(watchPosition, clearWatch);
    Object.defineProperty(navigator, "vibrate", { configurable: true, value: vibrate });

    render(<VoyageNavigationTools route={routeFixture} />);
    fireEvent.click(screen.getByRole("button", { name: "Abweichungsalarm starten" }));

    expect(watchPosition).toHaveBeenCalledTimes(1);
    expect(screen.getByRole("button", { name: "Abweichungsalarm stoppen" })).toBeInTheDocument();

    act(() => success?.(positionAt(53.01, 7.005, 5)));

    expect(screen.getByRole("alert")).toHaveTextContent(/von der Route entfernt/);
    expect(vibrate).toHaveBeenCalledWith([200, 100, 200]);

    fireEvent.click(screen.getByRole("button", { name: "Abweichungsalarm stoppen" }));
    expect(clearWatch).toHaveBeenCalledWith(42);
  });

  it("saves and restores the route and plan on this device", () => {
    const onLoad = vi.fn();
    render(
      <VoyageNavigationTools
        route={routeFixture}
        plan={{
          vesselProfile: { draughtM: 1.4, safetyReserveM: 0.5, cruiseSpeedKn: 6 },
          departureAt: "2026-07-20T06:00:00.000Z"
        }}
        onLoadOfflineVoyage={onLoad}
      />
    );

    fireEvent.click(screen.getByRole("button", { name: "Route offline speichern" }));
    expect(screen.getByText(/ist auf diesem Gerät offline verfügbar/)).toBeInTheDocument();
    fireEvent.click(screen.getByRole("button", { name: "Offline-Route laden" }));

    expect(onLoad).toHaveBeenCalledTimes(1);
    expect(onLoad.mock.calls[0]?.[0].route.geometry).toEqual(routeFixture.geometry);
    expect(onLoad.mock.calls[0]?.[0].plan.vesselProfile.cruiseSpeedKn).toBe(6);
  });
});

function installGeolocation(watchPosition: typeof navigator.geolocation.watchPosition, clearWatch: typeof navigator.geolocation.clearWatch) {
  Object.defineProperty(navigator, "geolocation", {
    configurable: true,
    value: { watchPosition, clearWatch, getCurrentPosition: vi.fn() }
  });
}

function restoreNavigatorProperty(name: "geolocation" | "vibrate", descriptor: PropertyDescriptor | undefined) {
  if (descriptor) {
    Object.defineProperty(navigator, name, descriptor);
  } else {
    Reflect.deleteProperty(navigator, name);
  }
}

function positionAt(lat: number, lon: number, accuracy: number): GeolocationPosition {
  return {
    coords: {
      latitude: lat,
      longitude: lon,
      accuracy,
      altitude: null,
      altitudeAccuracy: null,
      heading: null,
      speed: null,
      toJSON: () => ({})
    },
    timestamp: Date.now(),
    toJSON: () => ({})
  };
}

const routeFixture: RouteResult = {
  id: "test-route",
  name: "Testfahrt",
  geometry: { type: "LineString", coordinates: [[7, 53], [7.01, 53]] },
  distanceNm: 0.4,
  eta: null,
  warnings: [],
  dataSources: ["Test"],
  routingMode: "fairway"
};