Replaces words with emoji. Formatting enhancements for play/pause buttons. Switched to lower fidelity audio stream for better performance.

Co-authored-by: Copilot <copilot@github.com>

README.md

@@ -1,3 +1,48 @@
 # kryz-go
 
-KRYZ Go! Mobile radio app
+KRYZ Go! mobile radio app built with Next.js + React and packaged with Capacitor.
+
+## Stack
+
+- Next.js (App Router, static export)
+- React
+- Capacitor (Android and iOS)
+- `@anuradev/capacitor-background-mode` for improved background playback reliability
+
+## Install
+
+```bash
+npm install
+```
+
+## Develop Frontend
+
+```bash
+npm run dev
+```
+
+## Build Web Assets For Capacitor
+
+```bash
+npm run build
+```
+
+This exports static files into `out/`, which is the Capacitor `webDir`.
+
+## Sync Native Projects
+
+```bash
+npm run sync
+```
+
+## Run Android
+
+```bash
+npm run android
+```
+
+## Open Android Studio
+
+```bash
+npm run open:android
+```

app/AudioPlayer.ts

@@ -0,0 +1,172 @@
+type PermissionState = 'granted' | 'denied' | 'prompt';
+
+export type BackgroundModePlugin = {
+  checkMicrophonePermission: () => Promise<{ microphone: PermissionState | string }>;
+  requestMicrophonePermission: () => Promise<{ microphone: PermissionState | string }>;
+  checkNotificationsPermission: () => Promise<{ notifications: PermissionState | string }>;
+  requestNotificationsPermission: () => Promise<{ notifications: PermissionState | string }>;
+  checkBatteryOptimizations: () => Promise<{ enabled: boolean }>;
+  requestDisableBatteryOptimizations: () => Promise<void>;
+  disableWebViewOptimizations: () => Promise<void>;
+  enable: (options: {
+    title: string;
+    text: string;
+    channelName: string;
+    channelDescription: string;
+    resume: boolean;
+    silent: boolean;
+    disableWebViewOptimization: boolean;
+  }) => Promise<void>;
+  addListener: (eventName: string, listener: () => void) => Promise<void>;
+};
+
+export type CapacitorRuntime = {
+  Plugins?: {
+    BackgroundMode?: BackgroundModePlugin;
+  };
+};
+
+export type CapacitorWindow = Window & {
+  Capacitor?: CapacitorRuntime;
+};
+
+export type PlaybackState = 'stopped' | 'playing' | 'error';
+
+export const STREAM_URL = 'https://kryz.out.airtime.pro/kryz_a';
+
+export class AudioPlayer {
+  private url: string;
+  private onStateChange: (state: PlaybackState, status: string) => void;
+  private element: HTMLAudioElement | null = null;
+  private playbackState: PlaybackState = 'stopped';
+
+  constructor(url: string, onStateChange: (state: PlaybackState, status: string) => void) {
+    this.url = url;
+    this.onStateChange = onStateChange;
+    this.handleEnded = this.handleEnded.bind(this);
+    this.handleError = this.handleError.bind(this);
+  }
+
+  setElement(el: HTMLAudioElement): void {
+    this.element = el;
+    el.addEventListener('ended', this.handleEnded);
+    el.addEventListener('error', this.handleError);
+  }
+
+  private handleEnded(): void {
+    this.playbackState = 'stopped';
+    this.onStateChange('stopped', 'Stream ended.');
+  }
+
+  private handleError(): void {
+    this.playbackState = 'error';
+    this.onStateChange('error', 'Stream error.');
+  }
+
+  async initBackgroundMode(backgroundMode: BackgroundModePlugin): Promise<void> {
+    try {
+      const notificationPermission = await backgroundMode.checkNotificationsPermission();
+      if (notificationPermission.notifications !== 'granted') {
+        await backgroundMode.requestNotificationsPermission();
+      }
+
+      const microphonePermission = await backgroundMode.checkMicrophonePermission();
+      if (microphonePermission.microphone !== 'granted') {
+        const requestedMicrophonePermission = await backgroundMode.requestMicrophonePermission();
+        if (requestedMicrophonePermission.microphone !== 'granted') {
+          console.warn(
+            'BackgroundMode microphone permission denied; background playback may stop when screen is off.'
+          );
+        }
+      }
+
+      const batteryOptimizations = await backgroundMode.checkBatteryOptimizations();
+      if (batteryOptimizations.enabled) {
+        console.warn(
+          'Battery optimizations are enabled; requesting exemption for reliable background playback.'
+        );
+        await backgroundMode.requestDisableBatteryOptimizations();
+      }
+
+      await backgroundMode.disableWebViewOptimizations();
+
+      await backgroundMode.enable({
+        title: 'KRYZ-Go!',
+        text: 'Background mode is active',
+        channelName: 'kryz-go background',
+        channelDescription: 'Keeps kryz-go running while the app is in background',
+        resume: true,
+        silent: false,
+        disableWebViewOptimization: true,
+      });
+
+      await backgroundMode.addListener('appInBackground', () => {
+        console.log('kryz-go moved to background');
+      });
+
+      await backgroundMode.addListener('appInForeground', () => {
+        console.log('kryz-go returned to foreground');
+      });
+
+      console.log('BackgroundMode plugin enabled.');
+    } catch (error) {
+      console.error('Failed to initialize BackgroundMode plugin:', error);
+    }
+  }
+
+  private async ensureBackgroundPermissions(backgroundMode: BackgroundModePlugin): Promise<boolean> {
+    const microphonePermission = await backgroundMode.checkMicrophonePermission();
+    if (microphonePermission.microphone === 'granted') {
+      return true;
+    }
+
+    const requestedMicrophonePermission = await backgroundMode.requestMicrophonePermission();
+    if (requestedMicrophonePermission.microphone === 'granted') {
+      return true;
+    }
+
+    this.onStateChange(
+      this.playbackState,
+      'Enable microphone permission in Android settings for screen-off playback.'
+    );
+    console.warn('Background playback blocked: microphone permission not granted.');
+    return false;
+  }
+
+  async play(backgroundMode?: BackgroundModePlugin): Promise<void> {
+    if (!this.element) {
+      return;
+    }
+
+    try {
+      if (backgroundMode) {
+        const hasPermissions = await this.ensureBackgroundPermissions(backgroundMode);
+        if (!hasPermissions) {
+          return;
+        }
+      }
+
+      this.element.src = this.url;
+      await this.element.play();
+      this.playbackState = 'playing';
+      this.onStateChange('playing', 'Stream is playing.');
+    } catch (error) {
+      this.playbackState = 'error';
+      this.onStateChange('error', 'Unable to start stream.');
+      console.error('Failed to start stream:', error);
+    }
+  }
+
+  stop(): void {
+    if (!this.element) {
+      return;
+    }
+
+    this.element.pause();
+    this.element.removeAttribute('src');
+    this.element.load();
+
+    this.playbackState = 'stopped';
+    this.onStateChange('stopped', 'Stream is stopped.');
+  }
+}

app/globals.css

@@ -0,0 +1,125 @@
+:root {
+  --bg-1: #f8f2e6;
+  --bg-2: #dce9f4;
+  --card: #fff9f0;
+  --ink: #1f2633;
+  --muted: #586173;
+  --primary: #0a5f94;
+  --primary-press: #084d79;
+  --disabled: #9fa9b8;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html,
+body {
+  margin: 0;
+  min-height: 100%;
+}
+
+body {
+  color: var(--ink);
+  font-family: 'Trebuchet MS', 'Avenir Next', 'Segoe UI', sans-serif;
+  background:
+    radial-gradient(circle at 16% 18%, rgba(255, 255, 255, 0.85) 0%, rgba(255, 255, 255, 0) 44%),
+    linear-gradient(140deg, var(--bg-1), var(--bg-2));
+}
+
+.page-shell {
+  min-height: 100vh;
+  display: grid;
+  place-items: center;
+  padding: 1.25rem;
+}
+
+.player-card {
+  width: min(30rem, 100%);
+  border-radius: 1.25rem;
+  background: var(--card);
+  box-shadow:
+    0 1.5rem 3rem rgba(18, 50, 73, 0.17),
+    inset 0 0.1rem 0.25rem rgba(255, 255, 255, 0.6);
+  padding: 1.4rem;
+  text-align: center;
+  animation: card-enter 420ms ease-out;
+}
+
+.eyebrow {
+  margin: 0;
+  text-transform: uppercase;
+  letter-spacing: 0.14em;
+  font-weight: 700;
+  font-size: 0.72rem;
+  color: var(--muted);
+}
+
+h1 {
+  margin: 0.4rem 0 0.6rem;
+  font-size: clamp(2rem, 8vw, 2.8rem);
+  line-height: 1.1;
+}
+
+.status {
+  margin: 0 0 1.2rem;
+  color: var(--muted);
+  font-size: 1rem;
+  min-height: 1.3rem;
+}
+
+.controls {
+  display: grid;
+  gap: 0.75rem;
+  grid-template-columns: 1fr 1fr;
+}
+
+button {
+  appearance: none;
+  border: none;
+  border-radius: 0.7rem;
+  background: var(--primary);
+  color: #ffffff;
+  font-size: 1rem;
+  font-weight: 700;
+  padding: 0.78rem 1rem;
+  cursor: pointer;
+  transition: transform 120ms ease, background 120ms ease;
+}
+
+button.playpause {
+  width: 100%;
+  aspect-ratio: 1;
+  font-size: clamp(2rem, 25vw, 6em);
+  padding: 0;
+}
+
+button:hover:not(:disabled) {
+  background: var(--primary-press);
+}
+
+button:active:not(:disabled) {
+  transform: translateY(1px);
+}
+
+button:disabled {
+  cursor: not-allowed;
+  background: var(--disabled);
+}
+
+@keyframes card-enter {
+  from {
+    opacity: 0;
+    transform: translateY(10px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@media (max-width: 560px) {
+  .controls {
+    grid-template-columns: 1fr;
+  }
+}

app/layout.tsx

@@ -0,0 +1,25 @@
+import type { Metadata } from 'next';
+import './globals.css';
+
+export const metadata: Metadata = {
+  title: 'kryz-go',
+  description: 'KRYZ Go! mobile radio app',
+};
+
+export default function RootLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <html lang="en">
+      <head>
+        <meta
+          httpEquiv="Content-Security-Policy"
+          content="default-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline'; media-src 'self' https://kryz.out.airtime.pro"
+        />
+      </head>
+      <body>{children}</body>
+    </html>
+  );
+}

app/page.tsx

@@ -0,0 +1,63 @@
+'use client';
+
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { AudioPlayer, CapacitorWindow, STREAM_URL } from './AudioPlayer';
+
+export default function HomePage() {
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+  const [status, setStatus] = useState('Stream is stopped.');
+  const [isPlaying, setIsPlaying] = useState(false);
+
+  const backgroundMode = useMemo(() => {
+    if (typeof window === 'undefined') {
+      return undefined;
+    }
+    return (window as CapacitorWindow).Capacitor?.Plugins?.BackgroundMode;
+  }, []);
+
+  const player = useMemo(
+    () =>
+      new AudioPlayer(STREAM_URL, (state, msg) => {
+        setIsPlaying(state === 'playing');
+        setStatus(msg);
+      }),
+    []
+  );
+
+  useEffect(() => {
+    if (audioRef.current) {
+      player.setElement(audioRef.current);
+    }
+  }, [player]);
+
+  useEffect(() => {
+    if (!backgroundMode) {
+      console.warn('BackgroundMode plugin is not available in this runtime.');
+      return;
+    }
+    void player.initBackgroundMode(backgroundMode);
+  }, [player, backgroundMode]);
+
+  return (
+    <main className="page-shell">
+      <section className="player-card" aria-label="KRYZ live stream player">
+        <p className="eyebrow">KRYZ Go!</p>
+        <h1>Live Radio</h1>
+        <p className="status" aria-live="polite">
+          {status}
+        </p>
+
+        <div className="controls">
+          <button type="button" className='playpause' onClick={() => void player.play(backgroundMode)} disabled={isPlaying}>
+            ▶️
+          </button>
+          <button type="button" className='playpause' onClick={() => player.stop()} disabled={!isPlaying}>
+            ⏹️
+          </button>
+        </div>
+
+        <audio ref={audioRef} preload="none" />
+      </section>
+    </main>
+  );
+}

capacitor.config.ts

@@ -3,7 +3,7 @@ import { CapacitorConfig } from '@capacitor/cli';
 const config: CapacitorConfig = {
   appId: 'com.kryzgo.app',
   appName: 'kryz-go',
-  webDir: 'www',
+  webDir: 'out',
   android: {
     adjustMarginsForEdgeToEdge: 'force',
     buildOptions: {

next-env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+import "./.next/types/routes.d.ts";
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

next.config.ts

@@ -0,0 +1,11 @@
+import type { NextConfig } from 'next';
+
+const nextConfig: NextConfig = {
+  output: 'export',
+  trailingSlash: true,
+  images: {
+    unoptimized: true,
+  },
+};
+
+export default nextConfig;

package.json

@@ -3,19 +3,26 @@
   "version": "1.0.0",
   "description": "Capacitor mobile app",
   "scripts": {
-    "build": "echo 'Add your web build command here'",
+    "dev": "next dev",
-    "sync": "cap sync",
+    "build": "next build",
-    "android": "cap run android",
+    "sync": "npm run build && cap sync",
+    "android": "npm run sync && cap run android",
     "open:android": "cap open android"
   },
   "dependencies": {
     "@anuradev/capacitor-background-mode": "^7.2.1",
     "@capacitor/android": "^7.0.0",
     "@capacitor/core": "^7.0.0",
-    "@capacitor/ios": "^7.0.0"
+    "@capacitor/ios": "^7.0.0",
+    "next": "^16.2.4",
+    "react": "^19.2.5",
+    "react-dom": "^19.2.5"
   },
   "devDependencies": {
     "@capacitor/cli": "^7.0.0",
+    "@types/node": "^25.6.0",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
     "typescript": "^6.0.3"
   }
 }

tsconfig.json

@@ -0,0 +1,36 @@
+{
+  "compilerOptions": {
+    "target": "ES2017",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
+    "allowJs": false,
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "react-jsx",
+    "incremental": true,
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ]
+  },
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
+}

www/css/style.css

@@ -1,61 +0,0 @@
-* {
-  box-sizing: border-box;
-  margin: 0;
-  padding: 0;
-}
-
-body {
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-  background: #ffffff;
-  color: #1a1a1a;
-}
-
-#app {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  gap: 1rem;
-  min-height: 100vh;
-  padding: 1rem;
-  text-align: center;
-}
-
-h1 {
-  font-size: 2rem;
-}
-
-#stream-status {
-  font-size: 1rem;
-}
-
-.controls {
-  display: flex;
-  gap: 0.75rem;
-}
-
-button {
-  border: none;
-  border-radius: 0.5rem;
-  padding: 0.75rem 1rem;
-  font-size: 1rem;
-  font-weight: 600;
-  color: #ffffff;
-  background: #1456a7;
-}
-
-button:disabled {
-  background: #9da8b3;
-  color: #f5f5f5;
-}
-
-@media (max-width: 480px) {
-  .controls {
-    width: 100%;
-    flex-direction: column;
-  }
-
-  button {
-    width: 100%;
-  }
-}

www/index.html

@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <meta
-      http-equiv="Content-Security-Policy"
-      content="default-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self'; media-src 'self' https://kryz.out.airtime.pro"
-    />
-    <title>kryz-go</title>
-    <link rel="stylesheet" href="css/style.css" />
-  </head>
-  <body>
-    <div id="app">
-      <h1>kryz-go</h1>
-      <p id="stream-status" aria-live="polite">Stream is stopped.</p>
-      <div class="controls">
-        <button id="start-stream" type="button">Start Stream</button>
-        <button id="stop-stream" type="button" disabled>Stop Stream</button>
-      </div>
-      <audio id="stream-player" preload="none"></audio>
-    </div>
-    <script src="js/app.js"></script>
-  </body>
-</html>

www/js/app.js

@@ -1,133 +0,0 @@
-// kryz-go app entry point
-window.addEventListener('DOMContentLoaded', () => {
-  console.log('kryz-go loaded');
-  initializeStreamPlayer();
-  initializeBackgroundMode();
-});
-
-function initializeStreamPlayer() {
-  const streamUrl = 'https://kryz.out.airtime.pro/kryz_b';
-  const audio = document.getElementById('stream-player');
-  const startButton = document.getElementById('start-stream');
-  const stopButton = document.getElementById('stop-stream');
-  const status = document.getElementById('stream-status');
-
-  if (!audio || !startButton || !stopButton || !status) {
-    console.error('Stream player controls are missing from the page.');
-    return;
-  }
-
-  const setStatus = (isPlaying, text) => {
-    startButton.disabled = isPlaying;
-    stopButton.disabled = !isPlaying;
-    status.textContent = text;
-  };
-
-  const ensureBackgroundPlaybackPermissions = async () => {
-    const backgroundMode = window.Capacitor?.Plugins?.BackgroundMode;
-
-    if (!backgroundMode) {
-      return true;
-    }
-
-    const microphonePermission = await backgroundMode.checkMicrophonePermission();
-    if (microphonePermission.microphone === 'granted') {
-      return true;
-    }
-
-    const requestedMicrophonePermission = await backgroundMode.requestMicrophonePermission();
-    if (requestedMicrophonePermission.microphone === 'granted') {
-      return true;
-    }
-
-    setStatus(false, 'Enable microphone permission in Android settings for screen-off playback.');
-    console.warn('Background playback blocked: microphone permission not granted.');
-    return false;
-  };
-
-  const startStream = async () => {
-    try {
-      const hasBackgroundPermissions = await ensureBackgroundPlaybackPermissions();
-      if (!hasBackgroundPermissions) {
-        return;
-      }
-
-      audio.src = streamUrl;
-      await audio.play();
-      setStatus(true, 'Stream is playing.');
-    } catch (error) {
-      setStatus(false, 'Unable to start stream.');
-      console.error('Failed to start stream:', error);
-    }
-  };
-
-  const stopStream = () => {
-    audio.pause();
-    audio.removeAttribute('src');
-    audio.load();
-    setStatus(false, 'Stream is stopped.');
-  };
-
-  startButton.addEventListener('click', startStream);
-  stopButton.addEventListener('click', stopStream);
-  audio.addEventListener('ended', () => {
-    setStatus(false, 'Stream ended.');
-  });
-  audio.addEventListener('error', () => {
-    setStatus(false, 'Stream error.');
-  });
-}
-
-async function initializeBackgroundMode() {
-  const backgroundMode = window.Capacitor?.Plugins?.BackgroundMode;
-
-  if (!backgroundMode) {
-    console.warn('BackgroundMode plugin is not available in this runtime.');
-    return;
-  }
-
-  try {
-    const notificationPermission = await backgroundMode.checkNotificationsPermission();
-    if (notificationPermission.notifications !== 'granted') {
-      await backgroundMode.requestNotificationsPermission();
-    }
-
-    const microphonePermission = await backgroundMode.checkMicrophonePermission();
-    if (microphonePermission.microphone !== 'granted') {
-      const requestedMicrophonePermission = await backgroundMode.requestMicrophonePermission();
-      if (requestedMicrophonePermission.microphone !== 'granted') {
-        console.warn('BackgroundMode microphone permission denied; background playback may stop when screen is off.');
-      }
-    }
-
-    const batteryOptimizations = await backgroundMode.checkBatteryOptimizations();
-    if (batteryOptimizations.enabled) {
-      console.warn('Battery optimizations are enabled; requesting exemption for reliable background playback.');
-      await backgroundMode.requestDisableBatteryOptimizations();
-    }
-
-    await backgroundMode.disableWebViewOptimizations();
-
-    await backgroundMode.enable({
-      title: 'KRYZ-Go!',
-      text: 'Background mode is active',
-      channelName: 'kryz-go background',
-      channelDescription: 'Keeps kryz-go running while the app is in background',
-      resume: true,
-      silent: false,
-      disableWebViewOptimization: true,
-    });
-
-    await backgroundMode.addListener('appInBackground', () => {
-      console.log('kryz-go moved to background');
-    });
-
-    await backgroundMode.addListener('appInForeground', () => {
-      console.log('kryz-go returned to foreground');
-    });
-
-    console.log('BackgroundMode plugin enabled.');
-  } catch (error) {
-    console.error('Failed to initialize BackgroundMode plugin:', error);
-  }
-}