Voice Activity Detection

final session = await RunAnywhere.startVoiceSession(
  config: VoiceSessionConfig(
    speechThreshold: 0.03,    // Audio level threshold
    silenceDuration: 1.5,     // Seconds of silence before processing
  ),
);

session.events.listen((event) {
  switch (event) {
    case VoiceSessionListening(:final audioLevel):
      // Show audio level meter
      updateAudioMeter(audioLevel);
    case VoiceSessionSpeechStarted():
      print('User started speaking');
    case VoiceSessionProcessing():
      print('Processing speech...');
    default:
      break;
  }
});

// More sensitive (quieter environments)
final quietConfig = VoiceSessionConfig(
  speechThreshold: 0.01,
  silenceDuration: 1.0,
);

// Less sensitive (noisy environments)
final noisyConfig = VoiceSessionConfig(
  speechThreshold: 0.1,
  silenceDuration: 2.0,
);

class VoiceLevelIndicator extends StatefulWidget {
  final Stream<double> audioLevelStream;

  const VoiceLevelIndicator({required this.audioLevelStream});

  @override
  _VoiceLevelIndicatorState createState() => _VoiceLevelIndicatorState();
}

class _VoiceLevelIndicatorState extends State<VoiceLevelIndicator> {
  double _level = 0.0;
  StreamSubscription? _subscription;

  @override
  void initState() {
    super.initState();
    _subscription = widget.audioLevelStream.listen((level) {
      setState(() => _level = level);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 10,
      child: LinearProgressIndicator(
        value: _level.clamp(0.0, 1.0),
        backgroundColor: Colors.grey[300],
        valueColor: AlwaysStoppedAnimation(
          _level > 0.03 ? Colors.green : Colors.grey,
        ),
      ),
    );
  }

  @override
  void dispose() {
    _subscription?.cancel();
    super.dispose();
  }
}

class VoiceAssistant extends StatefulWidget {
  @override
  _VoiceAssistantState createState() => _VoiceAssistantState();
}

class _VoiceAssistantState extends State<VoiceAssistant> {
  VoiceSessionHandle? _session;
  double _audioLevel = 0.0;
  bool _isSpeaking = false;
  String _status = 'Ready';

  Future<void> _startSession() async {
    _session = await RunAnywhere.startVoiceSession(
      config: VoiceSessionConfig(
        speechThreshold: 0.03,
        silenceDuration: 1.5,
        autoPlayTTS: true,
        continuousMode: true,
      ),
    );

    _session!.events.listen((event) {
      setState(() {
        switch (event) {
          case VoiceSessionListening(:final audioLevel):
            _audioLevel = audioLevel;
            _status = 'Listening...';
          case VoiceSessionSpeechStarted():
            _isSpeaking = true;
            _status = 'Speaking detected';
          case VoiceSessionProcessing():
            _isSpeaking = false;
            _status = 'Processing...';
          case VoiceSessionTranscribed(:final text):
            _status = 'You: $text';
          case VoiceSessionResponded(:final text):
            _status = 'AI: $text';
          case VoiceSessionSpeaking():
            _status = 'AI speaking...';
          case VoiceSessionTurnCompleted():
            _status = 'Ready';
          case VoiceSessionStopped():
            _status = 'Stopped';
          default:
            break;
        }
      });
    });
  }

  void _stopSession() {
    _session?.stop();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        // Audio level indicator
        Container(
          width: 100,
          height: 100,
          decoration: BoxDecoration(
            shape: BoxShape.circle,
            color: _isSpeaking ? Colors.green : Colors.blue,
            boxShadow: [
              BoxShadow(
                color: (_isSpeaking ? Colors.green : Colors.blue)
                    .withValues(alpha: 0.5),
                blurRadius: _audioLevel * 50,
                spreadRadius: _audioLevel * 20,
              ),
            ],
          ),
          child: Icon(
            _isSpeaking ? Icons.mic : Icons.mic_none,
            color: Colors.white,
            size: 48,
          ),
        ),

        SizedBox(height: 24),
        Text(_status, textAlign: TextAlign.center),

        SizedBox(height: 24),
        ElevatedButton(
          onPressed: _session == null ? _startSession : _stopSession,
          child: Text(_session == null ? 'Start' : 'Stop'),
        ),
      ],
    );
  }
}