Add settings page for alert preferences

README.md

@@ -115,6 +115,7 @@ components/dashboard dashboard aplikacji
 components/weather/  hero, stacje, metryki i szczegóły
 components/warnings/ alerty meteo i hydro
 components/hydro/     lista stacji hydrologicznych
+components/settings/ ustawienia języka, motywu i preferencji alertów
 components/ui/        bazowe komponenty interfejsu
 components/states/    loading, empty i error states
 hooks/                zapytania TanStack Query
@@ -127,6 +128,8 @@ public/               manifest, ikony i service worker
 
 Manifest znajduje się w `public/manifest.json`, a service worker w `public/sw.js`. Rejestracja service workera działa w buildzie produkcyjnym. Powłoka aplikacji ma podstawowy offline fallback. Odpowiedzi API mogą być dostępne z pamięci urządzenia przy braku sieci, ale UI nadal prezentuje czas pomiaru i status świeżości.
 
+Widok `/settings` zawiera pierwszy etap konfiguracji powiadomień o ostrzeżeniach meteorologicznych IMGW: wybór województwa, preferencję alertów i sprawdzenie zgody Web Push na urządzeniu. Na iOS powiadomienia webowe wymagają dodania PWA do ekranu początkowego i uruchomienia aplikacji z ikony. Realna wysyłka powiadomień wymaga jeszcze backendowego zapisu subskrypcji Web Push, kluczy VAPID oraz cyklicznego sprawdzania endpointu IMGW `warningsmeteo`; obecny UI nie wysyła jeszcze alertów.
+
 ## Wdrożenie na Vercel
 
 1. Umieść repozytorium w serwisie Git.

app/settings/page.tsx

@@ -0,0 +1,8 @@
+import type { Metadata } from "next";
+import { SettingsPage } from "@/components/settings/settings-page";
+
+export const metadata: Metadata = { title: "Ustawienia / Settings" };
+
+export default function Page() {
+  return <SettingsPage />;
+}

components/layout/app-shell.tsx

@@ -2,15 +2,13 @@
 
 import Link from "next/link";
 import { usePathname } from "next/navigation";
-import { CloudSun, Droplets, TriangleAlert } from "lucide-react";
+import { CloudSun, Droplets, Settings, TriangleAlert } from "lucide-react";
 import { NAV_ITEMS } from "@/lib/constants";
 import { cn } from "@/lib/utils";
 import { InstallPWAButton } from "@/components/ui/install-pwa-button";
-import { ThemeToggle } from "@/components/ui/theme-toggle";
-import { LanguageToggle } from "@/components/ui/language-toggle";
 import { useI18n } from "@/lib/i18n";
 
-const icons = [CloudSun, TriangleAlert, Droplets];
+const icons = [CloudSun, TriangleAlert, Droplets, Settings];
 
 export function AppShell({ children }: { children: React.ReactNode }) {
   const pathname = usePathname();
@@ -34,8 +32,6 @@ export function AppShell({ children }: { children: React.ReactNode }) {
           </nav>
           <div className="flex items-center gap-2">
             <InstallPWAButton />
-            <LanguageToggle />
-            <ThemeToggle />
           </div>
         </div>
       </header>
@@ -45,9 +41,9 @@ export function AppShell({ children }: { children: React.ReactNode }) {
           const Icon = icons[index];
           const active = item.href === "/" ? pathname === "/" : pathname.startsWith(item.href);
           return (
-            <Link key={item.href} href={item.href} className={cn("flex min-w-[5rem] flex-col items-center gap-1 rounded-card px-3 py-2 text-[0.68rem] font-medium transition focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent", active ? "bg-foreground text-background" : "text-muted")}>
+            <Link key={item.href} href={item.href} className={cn("flex min-w-0 flex-1 flex-col items-center gap-1 rounded-card px-2 py-2 text-[0.68rem] font-medium transition focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent", active ? "bg-foreground text-background" : "text-muted")}>
               <Icon className="size-4" />
-              {t(item.labelKey)}
+              <span className="max-w-full truncate">{t(item.labelKey)}</span>
             </Link>
           );
         })}

components/settings/settings-page.tsx

@@ -0,0 +1,218 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+import { Bell, BellRing, Languages, MapPinned, Palette, Settings, Smartphone } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Card } from "@/components/ui/card";
+import { LanguageToggle } from "@/components/ui/language-toggle";
+import { ThemeToggle } from "@/components/ui/theme-toggle";
+import { DEFAULT_STATION_ID } from "@/lib/constants";
+import { useI18n } from "@/lib/i18n";
+import { formatProvinceName, getProvinceForSelection, PROVINCES } from "@/lib/provinces";
+import { useWeatherStore } from "@/lib/store";
+import type { Province } from "@/types/province";
+
+type NotificationSupportStatus = "checking" | "unsupported" | "needs-install" | "default" | "denied" | "granted";
+
+function isStandaloneApp() {
+  if (typeof window === "undefined") return false;
+  const navigatorWithStandalone = window.navigator as Navigator & { standalone?: boolean };
+  return window.matchMedia("(display-mode: standalone)").matches || navigatorWithStandalone.standalone === true;
+}
+
+function getNotificationSupportStatus(): NotificationSupportStatus {
+  if (typeof window === "undefined") return "checking";
+  if (!("Notification" in window) || !("serviceWorker" in navigator) || !("PushManager" in window)) return "unsupported";
+  if (!isStandaloneApp()) return "needs-install";
+  return Notification.permission;
+}
+
+function SettingsRow({ icon: Icon, title, description, children }: { icon: typeof Settings; title: string; description: string; children: React.ReactNode }) {
+  return (
+    <div className="flex flex-col gap-4 border-t border-border/65 py-4 first:border-t-0 first:pt-0 last:pb-0 sm:flex-row sm:items-center sm:justify-between">
+      <div className="flex items-start gap-3">
+        <div className="rounded-control border border-border/70 bg-surface-muted/70 p-2 text-accent">
+          <Icon className="size-4" aria-hidden="true" />
+        </div>
+        <div>
+          <h2 className="text-sm font-semibold">{title}</h2>
+          <p className="mt-1 max-w-xl text-sm leading-6 text-muted">{description}</p>
+        </div>
+      </div>
+      <div className="shrink-0">{children}</div>
+    </div>
+  );
+}
+
+export function SettingsPage() {
+  const { language, t } = useI18n();
+  const [notificationStatus, setNotificationStatus] = useState<NotificationSupportStatus>("checking");
+  const selectedStationId = useWeatherStore((state) => state.selectedStationId);
+  const selectedLocation = useWeatherStore((state) => state.selectedLocation);
+  const notificationsEnabled = useWeatherStore((state) => state.warningNotificationsEnabled);
+  const provinceMode = useWeatherStore((state) => state.warningNotificationProvinceMode);
+  const manualProvince = useWeatherStore((state) => state.warningNotificationProvince);
+  const setNotificationsEnabled = useWeatherStore((state) => state.setWarningNotificationsEnabled);
+  const setProvinceMode = useWeatherStore((state) => state.setWarningNotificationProvinceMode);
+  const setManualProvince = useWeatherStore((state) => state.setWarningNotificationProvince);
+
+  const selectedProvince = getProvinceForSelection(selectedLocation?.province, selectedStationId ?? DEFAULT_STATION_ID);
+  const effectiveProvince = provinceMode === "manual" ? manualProvince : selectedProvince;
+  const effectiveProvinceLabel = effectiveProvince ? formatProvinceName(effectiveProvince, language) : t("settings.notifications.noProvince");
+
+  useEffect(() => {
+    const animationFrame = window.requestAnimationFrame(() => setNotificationStatus(getNotificationSupportStatus()));
+    return () => window.cancelAnimationFrame(animationFrame);
+  }, []);
+
+  const notificationStatusLabel = useMemo(() => {
+    switch (notificationStatus) {
+      case "unsupported":
+        return t("settings.notifications.statusUnsupported");
+      case "needs-install":
+        return t("settings.notifications.statusNeedsInstall");
+      case "denied":
+        return t("settings.notifications.statusDenied");
+      case "granted":
+        return t("settings.notifications.statusGranted");
+      case "default":
+        return t("settings.notifications.statusReady");
+      default:
+        return t("settings.notifications.statusChecking");
+    }
+  }, [notificationStatus, t]);
+
+  const canRequestPermission = notificationStatus === "default";
+  const canEnablePreference = notificationStatus === "granted";
+
+  async function requestNotificationPermission() {
+    if (!("Notification" in window)) {
+      setNotificationStatus("unsupported");
+      return;
+    }
+    const permission = await Notification.requestPermission();
+    setNotificationStatus(permission);
+    setNotificationsEnabled(permission === "granted");
+  }
+
+  return (
+    <div className="space-y-6">
+      <section>
+        <p className="section-kicker flex items-center gap-2"><Settings className="size-4" />{t("settings.section")}</p>
+        <h1 className="mt-2 text-3xl font-semibold tracking-tight">{t("settings.title")}</h1>
+        <p className="mt-2 max-w-2xl text-sm leading-6 text-muted">{t("settings.description")}</p>
+      </section>
+
+      <Card className="p-4 sm:p-5">
+        <SettingsRow icon={Languages} title={t("settings.language.title")} description={t("settings.language.description")}>
+          <LanguageToggle />
+        </SettingsRow>
+        <SettingsRow icon={Palette} title={t("settings.theme.title")} description={t("settings.theme.description")}>
+          <ThemeToggle />
+        </SettingsRow>
+      </Card>
+
+      <Card className="p-4 sm:p-5">
+        <div className="flex items-start gap-3">
+          <div className="rounded-control border border-warning/30 bg-warning/10 p-2 text-warning">
+            <BellRing className="size-4" aria-hidden="true" />
+          </div>
+          <div>
+            <p className="text-[0.68rem] font-semibold uppercase tracking-[0.16em] text-warning">IMGW</p>
+            <h2 className="mt-1 text-lg font-semibold tracking-tight">{t("settings.notifications.title")}</h2>
+            <p className="mt-1 max-w-2xl text-sm leading-6 text-muted">{t("settings.notifications.description")}</p>
+          </div>
+        </div>
+
+        <div className="mt-5 grid gap-3 lg:grid-cols-2">
+          <div className="rounded-card border border-border/65 bg-surface-muted/45 p-4">
+            <div className="flex items-start gap-3">
+              <MapPinned className="mt-0.5 size-4 text-accent" aria-hidden="true" />
+              <div>
+                <h3 className="text-sm font-semibold">{t("settings.notifications.regionTitle")}</h3>
+                <p className="mt-1 text-sm leading-6 text-muted">{t("settings.notifications.regionDescription", { province: effectiveProvinceLabel })}</p>
+              </div>
+            </div>
+
+            <div className="mt-4 space-y-3">
+              <label className="flex items-start gap-3 rounded-card border border-border/60 bg-surface px-3 py-3 text-sm">
+                <input
+                  type="radio"
+                  name="warning-notification-province-mode"
+                  checked={provinceMode === "selected"}
+                  onChange={() => setProvinceMode("selected")}
+                  className="mt-1 accent-accent"
+                />
+                <span>
+                  <span className="block font-medium">{t("settings.notifications.regionSelected")}</span>
+                  <span className="mt-0.5 block text-xs leading-5 text-muted">{selectedProvince ? formatProvinceName(selectedProvince, language) : t("settings.notifications.noProvince")}</span>
+                </span>
+              </label>
+              <label className="flex items-start gap-3 rounded-card border border-border/60 bg-surface px-3 py-3 text-sm">
+                <input
+                  type="radio"
+                  name="warning-notification-province-mode"
+                  checked={provinceMode === "manual"}
+                  onChange={() => {
+                    setProvinceMode("manual");
+                    if (!manualProvince) setManualProvince(selectedProvince ?? "mazowieckie");
+                  }}
+                  className="mt-1 accent-accent"
+                />
+                <span className="min-w-0 flex-1">
+                  <span className="block font-medium">{t("settings.notifications.regionManual")}</span>
+                  <select
+                    aria-label={t("settings.notifications.regionManual")}
+                    value={manualProvince ?? selectedProvince ?? "mazowieckie"}
+                    disabled={provinceMode !== "manual"}
+                    onChange={(event) => setManualProvince(event.target.value as Province)}
+                    className="surface-control mt-2 w-full rounded-control px-3 py-2 text-sm disabled:opacity-60"
+                  >
+                    {PROVINCES.map((province) => (
+                      <option key={province} value={province}>{formatProvinceName(province, language)}</option>
+                    ))}
+                  </select>
+                </span>
+              </label>
+            </div>
+          </div>
+
+          <div className="rounded-card border border-border/65 bg-surface-muted/45 p-4">
+            <div className="flex items-start gap-3">
+              <Smartphone className="mt-0.5 size-4 text-accent" aria-hidden="true" />
+              <div>
+                <h3 className="text-sm font-semibold">{t("settings.notifications.deviceTitle")}</h3>
+                <p className="mt-1 text-sm leading-6 text-muted">{notificationStatusLabel}</p>
+              </div>
+            </div>
+
+            <div className="mt-4 rounded-card border border-border/60 bg-surface px-3 py-3">
+              <label className="flex items-center justify-between gap-4 text-sm">
+                <span>
+                  <span className="block font-medium">{t("settings.notifications.enable")}</span>
+                  <span className="mt-0.5 block text-xs leading-5 text-muted">{t("settings.notifications.enableDescription")}</span>
+                </span>
+                <input
+                  type="checkbox"
+                  checked={notificationsEnabled}
+                  disabled={!canEnablePreference}
+                  onChange={(event) => setNotificationsEnabled(event.target.checked)}
+                  className="size-5 accent-accent"
+                />
+              </label>
+            </div>
+
+            <div className="mt-4 flex flex-col gap-2 sm:flex-row">
+              <Button type="button" disabled={!canRequestPermission} onClick={requestNotificationPermission}>
+                <Bell className="size-4" />
+                {t("settings.notifications.requestPermission")}
+              </Button>
+            </div>
+
+            <p className="mt-4 text-xs leading-5 text-muted">{t("settings.notifications.implementationNote")}</p>
+          </div>
+        </div>
+      </Card>
+    </div>
+  );
+}

lib/constants.ts

@@ -10,4 +10,5 @@ export const NAV_ITEMS = [
   { href: "/", labelKey: "nav.weather" },
   { href: "/warnings", labelKey: "nav.warnings" },
   { href: "/hydro", labelKey: "nav.hydro" },
+  { href: "/settings", labelKey: "nav.settings" },
 ] as const;

lib/i18n.tsx

@@ -10,6 +10,7 @@ const translations = {
     "nav.weather": "Pogoda",
     "nav.warnings": "Ostrzeżenia",
     "nav.hydro": "Hydro",
+    "nav.settings": "Ustawienia",
     "nav.main": "Główna nawigacja",
     "nav.mobile": "Mobilna nawigacja",
     "language.label": "Wybierz język",
@@ -18,6 +19,31 @@ const translations = {
     "theme.change": "Zmień motyw",
     "theme.light": "Włącz jasny motyw",
     "theme.dark": "Włącz ciemny motyw",
+    "settings.section": "Preferencje",
+    "settings.title": "Ustawienia",
+    "settings.description": "Zarządzaj językiem, wyglądem i przygotowaniem powiadomień o ostrzeżeniach meteorologicznych IMGW.",
+    "settings.language.title": "Język",
+    "settings.language.description": "Zmieniaj język interfejsu. Nazwy stacji i treści IMGW pozostają bez automatycznego tłumaczenia.",
+    "settings.theme.title": "Motyw",
+    "settings.theme.description": "Przełącz jasny lub ciemny wygląd aplikacji na tym urządzeniu.",
+    "settings.notifications.title": "Powiadomienia o ostrzeżeniach meteo",
+    "settings.notifications.description": "Przygotuj alerty dla nowych ostrzeżeń meteorologicznych IMGW, takich jak burze, upał, silny wiatr lub intensywny deszcz.",
+    "settings.notifications.regionTitle": "Obszar alertów",
+    "settings.notifications.regionDescription": "Aktualnie wybrany obszar dla przyszłych powiadomień: {province}.",
+    "settings.notifications.regionSelected": "Używaj lokalizacji wybranej w aplikacji",
+    "settings.notifications.regionManual": "Wybierz województwo ręcznie",
+    "settings.notifications.noProvince": "brak wybranego województwa",
+    "settings.notifications.deviceTitle": "To urządzenie",
+    "settings.notifications.enable": "Alerty IMGW",
+    "settings.notifications.enableDescription": "Preferencja zostanie użyta po dodaniu backendowej subskrypcji Web Push.",
+    "settings.notifications.requestPermission": "Sprawdź zgodę",
+    "settings.notifications.statusChecking": "Sprawdzam obsługę powiadomień w tej przeglądarce.",
+    "settings.notifications.statusUnsupported": "Ta przeglądarka nie udostępnia Web Push dla tej aplikacji.",
+    "settings.notifications.statusNeedsInstall": "Na iPhonie dodaj aplikację do ekranu początkowego przez Udostępnij → Dodaj do ekranu początkowego, a potem otwórz ją z ikony.",
+    "settings.notifications.statusDenied": "Powiadomienia są zablokowane w ustawieniach systemu lub przeglądarki.",
+    "settings.notifications.statusGranted": "To urządzenie ma zgodę na powiadomienia.",
+    "settings.notifications.statusReady": "Możesz poprosić system o zgodę na powiadomienia.",
+    "settings.notifications.implementationNote": "To pierwszy etap konfiguracji. Wysyłka po nowych ostrzeżeniach IMGW wymaga jeszcze zapisania subskrypcji Web Push i cyklicznego sprawdzania API IMGW po stronie serwera.",
     "pwa.install": "Zainstaluj",
     "common.noData": "Brak danych",
     "common.loading": "Ładowanie danych",
@@ -196,6 +222,7 @@ const translations = {
     "nav.weather": "Weather",
     "nav.warnings": "Warnings",
     "nav.hydro": "Hydro",
+    "nav.settings": "Settings",
     "nav.main": "Main navigation",
     "nav.mobile": "Mobile navigation",
     "language.label": "Select language",
@@ -204,6 +231,31 @@ const translations = {
     "theme.change": "Change theme",
     "theme.light": "Enable light theme",
     "theme.dark": "Enable dark theme",
+    "settings.section": "Preferences",
+    "settings.title": "Settings",
+    "settings.description": "Manage language, appearance and preparation for IMGW meteorological warning notifications.",
+    "settings.language.title": "Language",
+    "settings.language.description": "Change the interface language. Station names and IMGW content are not translated automatically.",
+    "settings.theme.title": "Theme",
+    "settings.theme.description": "Switch the light or dark appearance on this device.",
+    "settings.notifications.title": "Weather warning notifications",
+    "settings.notifications.description": "Prepare alerts for new IMGW meteorological warnings, such as thunderstorms, heat, strong wind or heavy rain.",
+    "settings.notifications.regionTitle": "Alert area",
+    "settings.notifications.regionDescription": "Current area for future notifications: {province}.",
+    "settings.notifications.regionSelected": "Use the location selected in the app",
+    "settings.notifications.regionManual": "Choose province manually",
+    "settings.notifications.noProvince": "no province selected",
+    "settings.notifications.deviceTitle": "This device",
+    "settings.notifications.enable": "IMGW alerts",
+    "settings.notifications.enableDescription": "This preference will be used after the Web Push backend subscription is added.",
+    "settings.notifications.requestPermission": "Check permission",
+    "settings.notifications.statusChecking": "Checking notification support in this browser.",
+    "settings.notifications.statusUnsupported": "This browser does not provide Web Push for this app.",
+    "settings.notifications.statusNeedsInstall": "On iPhone, add the app to the Home Screen using Share → Add to Home Screen, then open it from the icon.",
+    "settings.notifications.statusDenied": "Notifications are blocked in system or browser settings.",
+    "settings.notifications.statusGranted": "This device has notification permission.",
+    "settings.notifications.statusReady": "You can ask the system for notification permission.",
+    "settings.notifications.implementationNote": "This is the first configuration stage. Sending alerts for new IMGW warnings still requires saving a Web Push subscription and polling the IMGW API on the server.",
     "pwa.install": "Install",
     "common.noData": "No data",
     "common.loading": "Loading data",

lib/provinces.ts

@@ -103,6 +103,8 @@ const provinceLabels: Record<Province, Record<Language, string>> = {
   "zachodniopomorskie": { pl: "zachodniopomorskie", en: "West Pomeranian" },
 };
 
+export const PROVINCES = Object.keys(provinceLabels) as Province[];
+
 function simplifyProvinceName(value: string) {
   return value
     .normalize("NFD")

lib/store.ts

@@ -3,14 +3,23 @@
 import { create } from "zustand";
 import { persist } from "zustand/middleware";
 import type { SelectedLocation } from "@/types/location";
+import type { Province } from "@/types/province";
+
+type NotificationProvinceMode = "selected" | "manual";
 
 interface WeatherStore {
   favorites: string[];
   selectedStationId: string | null;
   selectedLocation: SelectedLocation | null;
+  warningNotificationsEnabled: boolean;
+  warningNotificationProvinceMode: NotificationProvinceMode;
+  warningNotificationProvince: Province | null;
   toggleFavorite: (id: string) => void;
   selectStation: (id: string) => void;
   selectLocation: (location: SelectedLocation) => void;
+  setWarningNotificationsEnabled: (enabled: boolean) => void;
+  setWarningNotificationProvinceMode: (mode: NotificationProvinceMode) => void;
+  setWarningNotificationProvince: (province: Province | null) => void;
 }
 
 export const useWeatherStore = create<WeatherStore>()(
@@ -19,6 +28,9 @@ export const useWeatherStore = create<WeatherStore>()(
       favorites: [],
       selectedStationId: null,
       selectedLocation: null,
+      warningNotificationsEnabled: false,
+      warningNotificationProvinceMode: "selected",
+      warningNotificationProvince: null,
       toggleFavorite: (id) =>
         set((state) => ({
           favorites: state.favorites.includes(id)
@@ -27,6 +39,9 @@ export const useWeatherStore = create<WeatherStore>()(
         })),
       selectStation: (id) => set({ selectedStationId: id, selectedLocation: null }),
       selectLocation: (location) => set({ selectedStationId: location.stationId, selectedLocation: location }),
+      setWarningNotificationsEnabled: (enabled) => set({ warningNotificationsEnabled: enabled }),
+      setWarningNotificationProvinceMode: (mode) => set({ warningNotificationProvinceMode: mode }),
+      setWarningNotificationProvince: (province) => set({ warningNotificationProvince: province }),
     }),
     { name: "wtr:preferences" },
   ),

public/sw.js

@@ -1,5 +1,5 @@
-const CACHE_NAME = "wtr-shell-v3";
+const CACHE_NAME = "wtr-shell-v4";
-const SHELL = ["/", "/offline", "/manifest.json", "/icons/icon.svg", "/icons/maskable.svg", "/icons/icon-192.png", "/icons/icon-512.png", "/icons/maskable-512.png"];
+const SHELL = ["/", "/settings", "/offline", "/manifest.json", "/icons/icon.svg", "/icons/maskable.svg", "/icons/icon-192.png", "/icons/icon-512.png", "/icons/maskable-512.png"];
 
 self.addEventListener("install", (event) => {
   event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL)));
@@ -32,3 +32,42 @@ self.addEventListener("fetch", (event) => {
     event.respondWith(fetch(event.request).catch(() => caches.match(event.request).then((response) => response || caches.match("/offline"))));
   }
 });
+
+self.addEventListener("push", (event) => {
+  const fallbackPayload = {
+    title: "IMGW",
+    body: "Nowe ostrzeżenie meteorologiczne.",
+    url: "/warnings",
+  };
+  let payload = fallbackPayload;
+  if (event.data) {
+    const text = event.data.text();
+    try {
+      payload = { ...fallbackPayload, ...JSON.parse(text) };
+    } catch {
+      payload = { ...fallbackPayload, body: text };
+    }
+  }
+
+  event.waitUntil(
+    self.registration.showNotification(payload.title, {
+      body: payload.body,
+      icon: "/icons/icon-192.png",
+      badge: "/icons/icon-192.png",
+      data: { url: payload.url || "/warnings" },
+    }),
+  );
+});
+
+self.addEventListener("notificationclick", (event) => {
+  event.notification.close();
+  const targetUrl = new URL(event.notification.data?.url || "/warnings", self.location.origin).href;
+
+  event.waitUntil(
+    self.clients.matchAll({ type: "window", includeUncontrolled: true }).then((clients) => {
+      const existingClient = clients.find((client) => client.url === targetUrl);
+      if (existingClient) return existingClient.focus();
+      return self.clients.openWindow(targetUrl);
+    }),
+  );
+});