#pragma once
#include "Singleton.h"
#include "portaudio.h"
#include "pa_type.h"

class FAudioRenderThread;
DECLARE_LOG_CATEGORY_EXTERN(PortAudioAPILog, Log, All);

class FPortAudioAPI : public TSingleton<FPortAudioAPI>
{
public:
	FPortAudioAPI();
	virtual void Init() override;
	virtual void BeginRelease() override;
	virtual void Release() override;

	void OpenStream(int32 InputDevice, int32 OutputDevice);
	
	TArray<FAudioDeviceInfo> GetDevices();
	TArray<FAudioHostInfo> GetHosts();

	void LogAllDevices();
	
	virtual FName GetName() override { return "PortAudioAPI"; }

	float SampleRate;
	int32 BlockSize;
	int32 GetOutputChannelCount() const;

	static bool IsInAudioThread();
	
	// PortAudio Callback (Internally called by callback function)
	int StreamCallback(SampleType** Input, SampleType** Output, unsigned long FrameCount, const PaStreamCallbackTimeInfo* TimeInfo, PaStreamCallbackFlags StatusFlags);

	float GetBufferLoad();
private:
	FAudioRenderThread* RenderThread;
	FRunnableThread* RenderThreadHandle;
	PaStream* StreamHandle;

	PaStreamParameters InputParameters;
	PaStreamParameters OutputParameters;
};