public func openLocalMicrophone(completion: CompletionClosure?) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func closeLocalMicrophone() {
    fatalError("\\(#function) must be overridden by subclass")
}

public func setCaptureVolume(volume: Int) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func setOutputVolume(_ volume: Int) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func setAudioRoute(_ route: AudioRoute) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func startCameraTest(
    cameraView: UIView,
    completion: CompletionClosure?
) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func stopCameraTest() {
    fatalError("\\(#function) must be overridden by subclass")
}

public func openLocalCamera(
    isFront: Bool,
    completion: CompletionClosure?
) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func closeLocalCamera() {
    fatalError("\\(#function) must be overridden by subclass")
}

public func switchCamera(isFront: Bool) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func switchMirror(mirrorType: MirrorType) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func updateVideoQuality(_ quality: VideoQuality) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func startScreenShare(appGroup: String) {
    fatalError("\\(#function) must be overridden by subclass")
}

public func stopScreenShare() {
    fatalError("\\(#function) must be overridden by subclass")
}

public func reset() { 
    fatalError("\\(#function) must be overridden by subclass") 
}

// Get singleton instance
let store = DeviceStore.shared

// Subscribe to state changes
store.state.subscribe { state in
    print("Microphone status: \\(state.microphoneStatus)")
    print("Camera status: \\(state.cameraStatus)")
    print("Network quality: \\(state.networkInfo.quality)")
}

// Open microphone
store.openLocalMicrophone { code, message in
    if code == 0 {
        print("Microphone opened successfully")
    }
}

// Open front camera
store.openLocalCamera(isFront: true) { code, message in
    if code == 0 {
        print("Camera opened successfully")
    }
}